Abstract
The effectiveness of calcium depends on its source, i.e., salt it is supplied with. This study aimed to determine the effects of calcium lactate in diet on inflammation and oxidative stress markers in ovariectomized rats. A total of 40 female Wistar rats were included in this study, which were divided into four groups. The control group was fed a standard diet, whereas the remaining three groups were ovariectomized and provided a standard diet containing calcium carbonate (OVX), a calcium-deficient diet (OVX_DEF), or a diet containing calcium lactate (OVX_CaL). The nutritional intervention lasted for 12 weeks, and then, the rats were sacrificed. Tissue and blood samples were taken and evaluated for cyclooxygenase 1 (COX-1), cyclooxygenase 2, and thiobarbituric acid reactive substance contents in the liver and serum, and total antioxidant status and lipoxygenase 1 contents only in the serum using enzyme-linked immunosorbent assay. Differences were observed in the effects of calcium carbonate and calcium lactate on the COX-1 content in the serum of ovariectomized rats: a lower COX-1 concentration was observed in the case of the calcium lactate diet. No significant differences were observed for the other parameters.
1 Introduction
Menopause in women is characterized by decreased bone mineral density and increased fragility of the skeleton, due to estrogen deficiency and negative calcium balance [1]. Calcium supplementation during menopause may improve bone mineral density. Calcium can be supplemented via sources such as hydroxyapatite, bone meal, and calcium salts. The most commonly used calcium source is calcium carbonate – inorganic salt, which is commonly found in the earth’s crust, shellfish eggs, oysters, and dark green leafy vegetables. The bioavailability of calcium carbonate is comparable to that of calcium citrate, orange juice fortified with calcium citrate malate, or skim milk. Furthermore, calcium carbonate chelates oxalate and thus prevents the formation of kidney stones [2,3]. It is the most commonly used calcium salt in nutritional intervention research [4–6] and is the chief ingredient of preparations prescribed by orthopedic surgeons and pediatricians (followed by calcium citrate) [7,8]. However, in supplements for postmenopausal women, calcium lactate is commonly used due to its ability to reduce the bone degradation rate [9].
Osteoporosis not only results in the loss of bone mineral mass but also accompanies numerous processes such as oxidative stress and inflammation. It is an inflammatory disease, in which bone resorption is associated with the formation of proinflammatory cytokines and macrophages. Activated leukocytes induce the formation of osteoclasts, and some of the known proinflammatory cytokines involved in this process are TNF-α, IL-6, and IL-1 [10]. Cyclooxygenase 1 (COX-1) and cyclooxygenase 2 (COX-2) – enzymes that lead to the formation of prostaglandins – are also involved in the regulation of inflammation. COX-1 regulates normal body responses and is expressed in most of the cells, whereas COX-2 is only expressed pathologically and is induced by TNF-α, IL-1, and lipopolysaccharide [11]. Therefore, COX-2 plays a key role in response to inflammation. COX-2-stimulated prostaglandin E2 causes inflammation in bone tissue, thus increasing the number of osteoclasts [12]. Although estrogen deficiency is considered a major factor for postmenopausal osteoporosis, oxidative stress also leads to a significant loss of bone mineral mass. An increase in reactive oxygen species (ROS) is associated with aging and regulates bone cell survival [13]. Throughout life, oxidative defense is essential for maintaining bone health, and a reduction in the level of sex hormones weakens oxidative defense and thus increases bone resorption [14]. The imbalance between the antioxidant system and the ROS level is a serious threat to the proper balance between bone structure and bone resorption. Furthermore, monitoring oxidative stress biomarkers is helpful in the diagnosis of postmenopausal osteoporosis [15]. The degree of severity of oxidative stress can be determined by monitoring the concentration of the fat peroxidation products (lipoxygenase 1 [LOX-1] and thiobarbituric acid reactive substances [TBARS]) and total antioxidant status (TAS) [15–17].
Previous studies have reported that an appropriate supplementation of calcium leads to a reduction in inflammation and oxidative stress by lowering the expression of IL-6 and TNF-α and reducing the activity of lipogenesis, as well as restoring the physiological balance between the levels of ROS and antioxidants [18]. Calcium supplementation reduces oxidative stress by increasing the concentration of antioxidant enzymes in the serum [19] and the plasma total antioxidant capacity [20]. In addition, calcium supplementation with other minerals and vitamins lowers the level of malondialdehyde – an indicator of oxidative stress [21,22].
However, whether calcium supplementation improves inflammation and antioxidant status in women under menopausal conditions and whether various calcium salts have a similar effect on the body are not known. Therefore, this study aimed to compare the effects of calcium lactate and calcium carbonate (which was used in the standard diet) on selected markers of inflammation and oxidative stress in ovariectomized rats.
2 Methods
2.1 Materials and reagents
Ingredients of the animal diets and their manufacturers were as follows: choline, cysteine, and water-soluble vitamins were purchased from Sigma-Aldrich (Darmstadt, Germany); minerals were purchased from Alfa Chem (Poznań, Poland); fat-soluble vitamins were purchased from a local pharmacy; corn starch, dextrin, casein, and cellulose were purchased from Hortimex (Konin, Poland); and sucrose and oil rapeseed were purchased from a local grocery store. Enzyme-linked immunosorbent assay (ELISA) kits were purchased from Sun Red (Shanghai, China).
2.2 Animals
Forty 12-week-old female Wistar rats were purchased from the Wielkopolska Center for Advanced Technologies (Adam Mickiewicz University, Poznań, Poland). There were no significant differences in the body weight of the rats. The experiment was carried out in accordance with the guidelines for the care and use of laboratory animals. The animals were kept under appropriate conditions: 12 h light/dark cycle, in individual cages. Before the experiment, the animals were acclimatized for 1 week and were provided ad libitum access to deionized water and feed.
2.3 Experimental protocols
Before the introduction of the modified diets, the animals were divided into four groups of ten rats each. Ovariectomy was performed in three groups (30 rats). Throughout the experiment as well as during the adaptation and weekly recovery after ovariectomy, the rats were fed the standard diet AIN-93M. Then, a 12-week nutritional intervention was introduced. The control group (C) was fed the standard diet (standard diet contains calcium carbonate as a source of calcium). The ovariectomized groups were fed as follows: group OVX was fed the standard diet (standard diet contains calcium carbonate as a source of calcium), OVX_DEF group was fed calcium-deficient diet (obtained by not adding calcium in the standard diet), OVX_CaL was fed the diet with calcium lactate. Calcium salt was added to ensure a constant level of calcium in all diets (except in the deficient one), i.e., about 5 g/kg, which is the same as in the standard AIN-93M diet. The schematic of the experiment is illustrated in Figure 1. Body weight of the rats was measured weekly, and their food consumption was recorded daily. In addition, the rats were subjected to a body composition analysis (Bruker LF90II) as a part of the experiment. After blood sampling, serum was obtained by centrifugation for 10 min at 4°C at 1,200×g. Then, the liver was isolated, weighed, and washed with saline. The tissues were then stored at −80°C until further analyses.

The scheme of the study. C, control group; OVX, ovariectomized group with standard diet; OVX_DEF, calcium-deficient ovariectomized group; OVX_CaL, ovariectomized group with calcium lactate.
2.4 Diet analysis
Dietary components were determined as follows: lipids – Soxhlet method (PN-EN ISO 3947: 2001; Soxtec System, Foss Tecator); proteins – Kjeldahl method (AOAC, 1995; Foss Tecator); ash – after complete burning in a furnace muffle (AOAC, 2000); carbohydrates – based on the fat, protein, ash, and water contents; and fiber – using the enzymatic gravimetric method.
2.5 Ca analysis in diets
Before evaluating the calcium content in the diet samples, 1 g of each sample was ashed in a muffle furnace at 450°C, and the samples were dissolved in 1 mol/l nitric acid (Merck, Kenilworth, NJ, USA). The samples were then diluted with deionized water and LaCl3 (0.5%), and the calcium content was determined using flame atomic absorption spectrometry (AAS-3, Carl Zeiss, Jena, Germany). The apparatus was validated with an accuracy of 92% on a reference material (Brown Bread BCR191, Sigma-Aldrich, St. Louis, MO, USA). Each of the samples was analyzed in triplicate.
2.6 Serum parameters
Concentrations of COX-1, COX-2, LOX-1, TAS, TBARS, and estradiol in the serum and concentrations of COX-1, COX-2, and TBARS in the liver were determined using ELISA kits (SunRed, Shanghai, China). Liver tissues were previously homogenized in phosphate-buffered saline by centrifugation at 7,000×g for 20 min. An infinite F50 spectrometer was used for the analysis (Tecan Group Ltd, Mannedorf, Switzerland).
2.7 Statistical analysis
The Statistica program (StatSoft, Tulsa, OK, USA) was used for statistical analysis. Normality of the distribution of variables was determined using the Shapiro–Wilk test. Tukey’s post hoc test was used to determine the differences between the groups. A p-value of <0.05 was considered statistically significant.
3 Results
The composition of diets is presented in Table 1. The highest calorific value, as well as the highest carbohydrate content, was observed in the calcium-deficient group. This is probably due to adding corn starch as an alternative to calcium carbonate. As expected, the lowest calcium content was observed in the calcium-deficient group.
Composition of diets (mean ± standard deviation)
Components | Diets | ||
---|---|---|---|
Calcium carbonate (standard diet) (C/OVX) | Calcium deficient (OVX_DEF) | Calcium lactate (OVX_CaL) | |
Caloric value (kcal/100 g) | 326.37 ± 4.48 | 336.01 ± 0.95 | 321.87 ± 3.37 |
Carbohydrates (g/100 g) | 47.92 ± 0.60 | 50.23 ± 0.22 | 44.53 ± 0.90 |
Fiber (g/100 g) | 23.04 ± 0.60 | 22.86 ± 1.50 | 25.05 ± 1.60 |
Fat (g/100 g) | 3.76 ± 0.41 | 3.74 ± 0.31 | 4.33 ± 0.16 |
Protein (g/100 g) | 13.70 ± 0.21 | 13.93 ± 0.45 | 13.67 ± 0.81 |
Ca (mg/g) | 5.63 ± 0.37 | 0.64 ± 0.04 | 5.68 ± 0.24 |
C, control group; OVX, ovariectomized group with standard diet; OVX_DEF, calcium-deficient ovariectomized group; OVX_CaL, ovariectomized group with calcium lactate.
Higher body weight and fat content were observed in the ovariectomized rats, with no differences between the three groups (Table 2). In addition, a significantly lower relative weight of the liver was observed in the OVX_DEF and OVX_CaL groups compared to the control group.
Daily intake and body composition in rats (mean ± standard deviation)
Parameter | Group | |||
---|---|---|---|---|
C | OVX | OVX_DEF | OVX_CaL | |
Daily intake of diet (g) | 25.08 ± 0.63 | 25.11 ± 1.70 | 26.14 ± 1.87 | 25.90 ± 0.55 |
Daily intake of calcium (mg) | 141.12 ± 3.56b | 141.30 ± 9.57b | 16.77 ± 1.20a | 147.03 ± 3.11b |
Body mass (g) | 325.86 ± 25.97a | 421.90 ± 55.10b | 441.00 ± 70.97b | 428.40 ± 51.10b |
Fat tissue (%) | 36.95 ± 8.63a | 54.43 ± 10.26b | 55.73 ± 11.11b | 58.59 ± 5.89b |
Relative weight of liver (%) | 2.82 ± 0.24b | 2.49 ± 0.68ab | 2.21 ± 0.17a | 2.22 ± 0.14a |
C, control group; OVX, ovariectomized group with standard diet; OVX_DEF, calcium-deficient ovariectomized group; OVX_CaL, ovariectomized group with calcium lactate.
a,b Significant differences between groups (p < 0.05).
In this experiment, the concentrations of selected parameters related to oxidative stress and inflammation in the serum and liver of the ovariectomized rats were measured (Table 3). The calcium-deficient diet was not found to affect the serum concentration of COX-1 and COX-2, but some changes were observed in the rats fed with different types of calcium salts. In the OVX group, the concentration of COX-1 in the serum was similar to that in the control group, whereas the addition of calcium lactate to the diet decreased the concentration of COX-1 in the serum. Calcium lactate significantly decreased the concentration of COX-1 in the serum compared to the calcium carbonate in the diet: OVX and C groups. Calcium lactate also increased the concentration of COX-2 in the serum compared to the control group.
Levels of parameters of oxidative stress and inflammation in rats (mean ± standard deviation)
Parameter | Group | ||||
---|---|---|---|---|---|
C | OVX | OVX_DEF | OVX_CaL | ||
Serum | COX-1 (ng/mL) | 5.16 ± 1.28b | 4.86 ± 1.11b | 4.22 ± 0.58ab | 3.74 ± 0.35a |
COX-2 (ng/mL) | 17.04 ± 3.16a | 20.41 ± 0.79ab | 19.19 ± 3.26ab | 21.64 ± 2.22b | |
LOX-1 (ng/mL) | 8.57 ± 1.19 | 9.25 ± 1.3 | 8.32 ± 0.94 | 8.95 ± 1.45 | |
TBARS (nmol/mL) | 11.91 ± 2.51 | 10.69 ± 2.36 | 10.93 ± 2.59 | 13.14 ± 2.13 | |
TAS (U/mL) | 10.25 ± 2.83 | 8.7 ± 1.77 | 9.03 ± 1.69 | 8.1 ± 1.5 | |
Liver | COX-1 (ng/g) | 25.14 ± 6.03 | 22.5 ± 7.59 | 19.48 ± 4.39 | 24.27 ± 6.77 |
COX-2 (ng/g) | 53.54 ± 11.23 | 55.27 ± 17.54 | 48.56 ± 13.06 | 44.46 ± 5.18 | |
TBARS (nmol/g) | 39.39 ± 10.01 | 33.37 ± 4.05 | 46.4 ± 12.79 | 44.46 ± 6.64 |
C, control group; OVX, ovariectomized group with standard diet; OVX_DEF, calcium-deficient ovariectomized group; OVX_CaL, ovariectomized group with calcium lactate; COX-1, cyclooxygenase 1; COX-2, cyclooxygenase 2; LOX-1, lipoxygenase 1; TBARS, thiobarbituric acid reactive substances; TAS, total antioxidant status.
a,bStatistical differences between groups (p < 0.05).
4 Discussion
The results showed that there are differences in the effects of calcium lactate and standard diet with calcium carbonate on cyclooxygenases in ovariectomized rats, which is a novel finding of this study.
Calcium lactate significantly decreased the serum COX-1 concentration in ovariectomized rats, which may indicate less inflammation in this group. Moreover, the COX-2 concentration in the liver was the lowest (but not significantly) in the calcium lactate group, which may confirm the beneficial effect of calcium lactate. Similarly, in the study by Cha et al. in rats on a high-fat diet, supplementation with organic and inorganic calcium resulted in a reduction in inflammation, which was attributable to a change in the composition of the intestinal microbiota [23]. Increases in the serum COX-2 level in rats with calcium lactate observed in this study may be a result of ovariectomy and the diet because changes were observed between the control group (without ovariectomy) and the ovariectomized group with calcium lactate. These findings need to be further explained in future experimental and clinical studies. Several authors did not observe any influence of calcium on inflammation biomarkers and did not find any difference between the calcium salts used. Amini et al. reported no significant changes in the levels of inflammatory markers (IL-6, TNF-α) after nutritional intervention with calcium carbonate [24]. In patients with colorectal cancer, the possible anti-inflammatory effects of organic and inorganic calcium salts (carbonate and citrate) were compared, but no significant changes in the levels of inflammatory markers (CRP, proinflammatory interleukins) were observed [25]. However, in rats with nonalcoholic fatty liver disease (NAFLD), calcium carbonate inhibited the synthesis of fatty acids in the liver, which reduces inflammation [26]. As reported in previous studies, ovariectomy is related to inflammation [27–29], and COX-2 is activated by factors related to inflammation [30–32]. In this study, we did not observe significant influence of ovariectomy on inflammation markers in rats (results in C and OVX were comparable). It was observed that calcium-deprived diet slightly decreased COX-1 and COX-2 levels in serum and liver in ovariectomized rats. Disorders in extracellular calcium ion levels may be involved in these results because calcium ions are implicated in the pathophysiology of immune stress and regulate COX-2 expression [33].
In this study, the calcium salts did not affect the biomarkers of oxidative stress. However, minor associations were found. Lower serum TAS values were recorded in the groups with high levels of COX-2 in the serum. However, Rabbani et al. reported that the reduction in oxidative stress is positively correlated with the concentration markers of inflammation such as COX-2, IL-8, and CCL2 proteins [34]. The lowest concentration of TAS was observed in the ovariectomized group with calcium carbonate or calcium lactate, which may indicate an increase in oxidative stress in these groups, but it may be a consequence of ovariectomy [35,36]. Yang et al. reported that calcium supplementation does not reduce oxidative stress, which was reflected in the concentration of F2 isoprostanes in the plasma [25]. Another marker of oxidative stress is the concentration of TBARS – a fat degradation product whose concentration increases with the growth of ROS [37]. In the present study, the highest serum TBARS concentration was observed in the group fed with calcium lactate, which corresponds to a high concentration of COX-2 in the serum. MacDowell et al. reported a similar increase in the COX-2 concentration with a simultaneous decrease in antioxidant properties in patients with borderline personality disorder [38].
The results obtained in this study may be related to changes caused by ovariectomy in rats. Ovariectomy increased body mass as was expected but did not impact inflammation and oxidative stress parameters. The reduction in estrogen levels is the primary factor for the increase in body weight and the adipose tissue (AT) content in postmenopausal women. During the reproductive period, estrogens interact with AT genes, reduce the central mass, and increase the subcutaneous AT content in the femoral area [39]. Normally, menopause is associated with the development of metabolic diseases, cardiovascular diseases, and type 2 diabetes. In addition, an increase in the AT content and redistribution are observed; lipids from subcutaneous AT penetrate visceral AT and are stored there. Higher body fat is associated with increased adipocyte size and insulin resistance and a higher expression of inflammatory cytokines [40]. Therefore, it can be supposed that ovariectomized rats would have increased levels of COX-2 in both serum and liver, indicating an increase in inflammation, which was not confirmed in the present study. In this study, we observed that ovariectomy and a calcium-deprived diet did not significantly affect markers of inflammation and oxidative stress. However, the source of calcium in the diet may impact cyclooxygenases level and calcium lactate may be more beneficial for COX-1 level than calcium carbonate in menopause.
Due to several limitations of this study, some of the obtained results could not be highlighted here. In this study only selected parameters of oxidative stress and inflammation were analyzed. Some indicators of oxidative stress such as superoxide dismutase and malondialdehyde and other inflammation cytokines were not analyzed because only a limited volume of serum was obtained from rats. Moreover, only two calcium salts: calcium carbonate and calcium lactate were compared in this study.
5 Conclusions
In ovariectomized rats, calcium carbonate and calcium lactate affect the serum COX-1 concentration in different ways. Calcium lactate exhibits a serum-COX-1-lowering effect in ovariectomized rats.
Abbreviations
- COX-1
-
cyclooxygenase 1
- COX-2
-
cyclooxygenase 2
- CRP
-
C reactive protein
- ELISA
-
enzyme-linked immunosorbent assay
- E2
-
estradiol
- IL-1
-
interleukin-1
- IL-6
-
interleukin-6
- LOX-1
-
lipoxygenase 1
- NAFLD
-
nonalcoholic fatty liver disease
- TAS
-
total antioxidant status
- TBARS
-
thiobarbituric acid reactive substances
- TNF-α
-
tumor necrosis factor
-
Funding information: This study was funded by the National Science Centre (grant number: 2018/29/B/NZ9/00461).
-
Author contributions: Conceptualization: N.W., J.S.; methodology: J.S., N.W.; software: J.S., N.W.; validation: N.W., J.S.; formal analysis: J.S.; investigation: N.W., P.K., J.S.; resources: A.G.M.; data curation: J.S., N.W.; writing – original draft preparation: N.W., J.S.; writing – review and editing: all authors; visualization: N.W., J.S.; supervision: J.S.; project administration: A.G.M.; funding acquisition: A.G.M. All authors have read and agreed to the published version of the manuscript.
-
Conflict of interest: The authors have declared that they have no conflict of interest.
-
Ethical approval: All experimental procedures were performed in accordance with the EU Directive 2010/63/EU for animal experiments. Approval for the study was obtained from the Local Ethics Committee in Poznań (no. 34/2019). The reporting in the manuscript follows the recommendations in the ARRIVE guidelines.
-
Data availability statement: The datasets generated and analyzed during the current study are available from the corresponding author on reasonable request.
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This work is licensed under the Creative Commons Attribution 4.0 International License.
Artikel in diesem Heft
- Regular Articles
- Photocatalytic degradation of Rhodamine B in aqueous phase by bimetallic metal-organic framework M/Fe-MOF (M = Co, Cu, and Mg)
- Assessment of using electronic portal imaging device for analysing bolus material utilised in radiation therapy
- A detailed investigation on highly dense CuZr bulk metallic glasses for shielding purposes
- Simulation of gamma-ray shielding properties for materials of medical interest
- Environmental impact assesment regulation applications and their analysis in Turkey
- Sample age effect on parameters of dynamic nuclear polarization in certain difluorobenzen isomers/MC800 asphaltene suspensions
- Passenger demand forecasting for railway systems
- Design of a Robust sliding mode controller for bioreactor cultures in overflow metabolism via an interdisciplinary approach
- Gamma, neutron, and heavy charged ion shielding properties of Er3+-doped and Sm3+-doped zinc borate glasses
- Bridging chiral de-tert-butylcalix[4]arenes: Optical resolution based on column chromatography and structural characterization
- Petrology and geochemistry of multiphase post-granitic dikes: A case study from the Gabal Serbal area, Southwestern Sinai, Egypt
- Comparison of the yield and purity of plasma exosomes extracted by ultracentrifugation, precipitation, and membrane-based approaches
- Bioactive triterpenoids from Indonesian medicinal plant Syzygium aqueum
- Investigation of the effects of machining parameters on surface integrity in micromachining
- The mesoporous aluminosilicate application as support for bifunctional catalysts for n-hexadecane hydroconversion
- Gamma-ray shielding properties of Nd2O3-added iron–boron–phosphate-based composites
- Numerical investigation on perforated sheet metals under tension loading
- Statistical analysis on the radiological assessment and geochemical studies of granite rocks in the north of Um Taghir area, Eastern Desert, Egypt
- Two new polypodane-type bicyclic triterpenoids from mastic
- Structural, physical, and mechanical properties of the TiO2 added hydroxyapatite composites
- Tribological properties and characterization of borided Co–Mg alloys
- Studies on Anemone nemorosa L. extracts; polyphenols profile, antioxidant activity, and effects on Caco-2 cells by in vitro and in silico studies
- Mechanical properties, elastic moduli, transmission factors, and gamma-ray-shielding performances of Bi2O3–P2O5–B2O3–V2O5 quaternary glass system
- Cyclic connectivity index of bipolar fuzzy incidence graph
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- Iminodisuccinic acid enhances antioxidant and mineral element accumulation in young leaves of Ziziphus jujuba
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- Effect of different ramie (Boehmeria nivea L. Gaud) cultivars on the adsorption of heavy metal ions cadmium and lead in the remediation of contaminated farmland soils
- Impact of a live bacterial-based direct-fed microbial (DFM) postpartum and weaning system on performance, mortality, and health of Najdi lambs
- Anti-tumor effect of liposomes containing extracted Murrayafoline A against liver cancer cells in 2D and 3D cultured models
- Physicochemical properties and some mineral concentration of milk samples from different animals and altitudes
- Copper(ii) complexes supported by modified azo-based ligands: Nucleic acid binding and molecular docking studies
- Diagnostic and therapeutic radioisotopes in nuclear medicine: Determination of gamma-ray transmission factors and safety competencies of high-dense and transparent glassy shields
- Calculation of NaI(Tl) detector efficiency using 226Ra, 232Th, and 40K radioisotopes: Three-phase Monte Carlo simulation study
- Isolation and identification of unstable components from Caesalpinia sappan by high-speed counter-current chromatography combined with preparative high-performance liquid chromatography
- Quantification of biomarkers and evaluation of antioxidant, anti-inflammatory, and cytotoxicity properties of Dodonaea viscosa grown in Saudi Arabia using HPTLC technique
- Characterization of the elastic modulus of ceramic–metal composites with physical and mechanical properties by ultrasonic technique
- GC-MS analysis of Vespa velutina auraria Smith and its anti-inflammatory and antioxidant activities in vitro
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- Insights into the molecular basis of some chalcone analogues as potential inhibitors of Leishmania donovani: An integrated in silico and in vitro study
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- Chemically modified Teucrium polium (Lamiaceae) plant act as an effective adsorbent tool for potassium permanganate (KMnO4) in wastewater remediation
- Efficiency analysis of photovoltaic systems installed in different geographical locations
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- Theoretical investigations on the excited-state intramolecular proton transfer in the solvated 2-hydroxy-1-naphthaldehyde carbohydrazone
- Mechanical and gamma-ray shielding examinations of Bi2O3–PbO–CdO–B2O3 glass system
- Machine learning-based forecasting of potability of drinking water through adaptive boosting model
- The potential effect of the Rumex vesicarius water seeds extract treatment on mice before and during pregnancy on the serum enzymes and the histology of kidney and liver
- Impact of benzimidazole functional groups on the n-doping properties of benzimidazole derivatives
- Extraction of red pigment from Chinese jujube peel and the antioxidant activity of the pigment extracts
- Flexural strength and thermal properties of carbon black nanoparticle reinforced epoxy composites obtained from waste tires
- A focusing study on radioprotective and antioxidant effects of Annona muricata leaf extract in the circulation and liver tissue: Clinical and experimental studies
- Clinical comprehensive and experimental assessment of the radioprotective effect of Annona muricata leaf extract to prevent cellular damage in the ileum tissue
- Effect of WC content on ultrasonic properties, thermal and electrical conductivity of WC–Co–Ni–Cr composites
- Influence of various class cleaning agents for prosthesis on Co–Cr alloy surface
- The synthesis of nanocellulose-based nanocomposites for the effective removal of hexavalent chromium ions from aqueous solution
- Study on the influence of physical interlayers on the remaining oil production under different development modes
- Optimized linear regression control of DC motor under various disturbances
- Influence of different sample preparation strategies on hypothesis-driven shotgun proteomic analysis of human saliva
- Determination of flow distance of the fluid metal due to fluidity in ductile iron casting by artificial neural networks approach
- Investigation of mechanical activation effect on high-volume natural pozzolanic cements
- In vitro: Anti-coccidia activity of Calotropis procera leaf extract on Eimeria papillata oocysts sporulation and sporozoite
- Determination of oil composition of cowpea (Vigna unguiculata L.) seeds under influence of organic fertilizer forms
- Activated partial thromboplastin time maybe associated with the prognosis of papillary thyroid carcinoma
- Treatment of rat brain ischemia model by NSCs-polymer scaffold transplantation
- Lead and cadmium removal with native yeast from coastal wetlands
- Characterization of electroless Ni-coated Fe–Co composite using powder metallurgy
- Ferrate synthesis using NaOCl and its application for dye removal
- Antioxidant, antidiabetic, and anticholinesterase potential of Chenopodium murale L. extracts using in vitro and in vivo approaches
- Study on essential oil, antioxidant activity, anti-human prostate cancer effects, and induction of apoptosis by Equisetum arvense
- Experimental study on turning machine with permanent magnetic cutting tool
- Numerical simulation and mathematical modeling of the casting process for pearlitic spheroidal graphite cast iron
- Design, synthesis, and cytotoxicity evaluation of novel thiophene, pyrimidine, pyridazine, and pyridine: Griseofulvin heterocyclic extension derivatives
- Isolation and identification of promising antibiotic-producing bacteria
- Ultrasonic-induced reversible blood–brain barrier opening: Safety evaluation into the cellular level
- Evaluation of phytochemical and antioxidant potential of various extracts from traditionally used medicinal plants of Pakistan
- Effect of calcium lactate in standard diet on selected markers of oxidative stress and inflammation in ovariectomized rats
- Identification of crucial salivary proteins/genes and pathways involved in pathogenesis of temporomandibular disorders
- Zirconium-modified attapulgite was used for removing of Cr(vi) in aqueous solution
- The stress distribution of different types of restorative materials in primary molar
- Reducing surface heat loss in steam boilers
- Deformation behavior and formability of friction stir processed DP600 steel
- Synthesis and characterization of bismuth oxide/commercial activated carbon composite for battery anode
- Phytochemical analysis of Ziziphus jujube leaf at different foliar ages based on widely targeted metabolomics
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- Separation and evaluation of potential antioxidant, analgesic, and anti-inflammatory activities of limonene-rich essential oils from Citrus sinensis (L.)
- Bioactivity of a polyhydroxy gorgostane steroid from Xenia umbellata
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- Analysis of standard systems with solar monitoring systems
- Structural and spectroscopic properties of voriconazole and fluconazole – Experimental and theoretical studies
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- An insight on Vietnamese bio-waste materials as activated carbon precursors for multiple applications in environmental protection
- Antimicrobial activities of the extracts and secondary metabolites from Clausena genus – A review
- Bioremediation of organic/heavy metal contaminants by mixed cultures of microorganisms: A review
- Sonodynamic therapy for breast cancer: A literature review
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- Erratum to “Copper(ii) complexes supported by modified azo-based ligands: Nucleic acid binding and molecular docking studies”
- Special Issue on Applied Biochemistry and Biotechnology (ABB 2021)
- Study of solidification and stabilization of heavy metals by passivators in heavy metal-contaminated soil
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Artikel in diesem Heft
- Regular Articles
- Photocatalytic degradation of Rhodamine B in aqueous phase by bimetallic metal-organic framework M/Fe-MOF (M = Co, Cu, and Mg)
- Assessment of using electronic portal imaging device for analysing bolus material utilised in radiation therapy
- A detailed investigation on highly dense CuZr bulk metallic glasses for shielding purposes
- Simulation of gamma-ray shielding properties for materials of medical interest
- Environmental impact assesment regulation applications and their analysis in Turkey
- Sample age effect on parameters of dynamic nuclear polarization in certain difluorobenzen isomers/MC800 asphaltene suspensions
- Passenger demand forecasting for railway systems
- Design of a Robust sliding mode controller for bioreactor cultures in overflow metabolism via an interdisciplinary approach
- Gamma, neutron, and heavy charged ion shielding properties of Er3+-doped and Sm3+-doped zinc borate glasses
- Bridging chiral de-tert-butylcalix[4]arenes: Optical resolution based on column chromatography and structural characterization
- Petrology and geochemistry of multiphase post-granitic dikes: A case study from the Gabal Serbal area, Southwestern Sinai, Egypt
- Comparison of the yield and purity of plasma exosomes extracted by ultracentrifugation, precipitation, and membrane-based approaches
- Bioactive triterpenoids from Indonesian medicinal plant Syzygium aqueum
- Investigation of the effects of machining parameters on surface integrity in micromachining
- The mesoporous aluminosilicate application as support for bifunctional catalysts for n-hexadecane hydroconversion
- Gamma-ray shielding properties of Nd2O3-added iron–boron–phosphate-based composites
- Numerical investigation on perforated sheet metals under tension loading
- Statistical analysis on the radiological assessment and geochemical studies of granite rocks in the north of Um Taghir area, Eastern Desert, Egypt
- Two new polypodane-type bicyclic triterpenoids from mastic
- Structural, physical, and mechanical properties of the TiO2 added hydroxyapatite composites
- Tribological properties and characterization of borided Co–Mg alloys
- Studies on Anemone nemorosa L. extracts; polyphenols profile, antioxidant activity, and effects on Caco-2 cells by in vitro and in silico studies
- Mechanical properties, elastic moduli, transmission factors, and gamma-ray-shielding performances of Bi2O3–P2O5–B2O3–V2O5 quaternary glass system
- Cyclic connectivity index of bipolar fuzzy incidence graph
- The role of passage numbers of donor cells in the development of Arabian Oryx – Cow interspecific somatic cell nuclear transfer embryos
- Mechanical property evaluation of tellurite–germanate glasses and comparison of their radiation-shielding characteristics using EPICS2017 to other glass systems
- Molecular screening of ionic liquids for CO2 absorption and molecular dynamic simulation
- Microwave-assisted preparation of Ag/Fe magnetic biochar from clivia leaves for adsorbing daptomycin antibiotics
- Iminodisuccinic acid enhances antioxidant and mineral element accumulation in young leaves of Ziziphus jujuba
- Cytotoxic activity of guaiane-type sesquiterpene lactone (deoxycynaropicrin) isolated from the leaves of Centaurothamnus maximus
- Effects of welding parameters on the angular distortion of welded steel plates
- Simulation of a reactor considering the Stamicarbon, Snamprogetti, and Toyo patents for obtaining urea
- Effect of different ramie (Boehmeria nivea L. Gaud) cultivars on the adsorption of heavy metal ions cadmium and lead in the remediation of contaminated farmland soils
- Impact of a live bacterial-based direct-fed microbial (DFM) postpartum and weaning system on performance, mortality, and health of Najdi lambs
- Anti-tumor effect of liposomes containing extracted Murrayafoline A against liver cancer cells in 2D and 3D cultured models
- Physicochemical properties and some mineral concentration of milk samples from different animals and altitudes
- Copper(ii) complexes supported by modified azo-based ligands: Nucleic acid binding and molecular docking studies
- Diagnostic and therapeutic radioisotopes in nuclear medicine: Determination of gamma-ray transmission factors and safety competencies of high-dense and transparent glassy shields
- Calculation of NaI(Tl) detector efficiency using 226Ra, 232Th, and 40K radioisotopes: Three-phase Monte Carlo simulation study
- Isolation and identification of unstable components from Caesalpinia sappan by high-speed counter-current chromatography combined with preparative high-performance liquid chromatography
- Quantification of biomarkers and evaluation of antioxidant, anti-inflammatory, and cytotoxicity properties of Dodonaea viscosa grown in Saudi Arabia using HPTLC technique
- Characterization of the elastic modulus of ceramic–metal composites with physical and mechanical properties by ultrasonic technique
- GC-MS analysis of Vespa velutina auraria Smith and its anti-inflammatory and antioxidant activities in vitro
- Texturing of nanocoatings for surface acoustic wave-based sensors for volatile organic compounds
- Insights into the molecular basis of some chalcone analogues as potential inhibitors of Leishmania donovani: An integrated in silico and in vitro study
- (1R,2S,5R)-5-Methyl-2-(propan-2-yl)cyclohexyl 4-amino-3-phenylbutanoate hydrochloride: Synthesis and anticonvulsant activity
- On the relative extraction rates of colour compounds and caffeine during brewing, an investigation of tea over time and temperature
- Characterization of egg shell powder-doped ceramic–metal composites
- Rapeseed oil-based hippurate amide nanocomposite coating material for anticorrosive and antibacterial applications
- Chemically modified Teucrium polium (Lamiaceae) plant act as an effective adsorbent tool for potassium permanganate (KMnO4) in wastewater remediation
- Efficiency analysis of photovoltaic systems installed in different geographical locations
- Risk prioritization model driven by success factor in the light of multicriteria decision making
- Theoretical investigations on the excited-state intramolecular proton transfer in the solvated 2-hydroxy-1-naphthaldehyde carbohydrazone
- Mechanical and gamma-ray shielding examinations of Bi2O3–PbO–CdO–B2O3 glass system
- Machine learning-based forecasting of potability of drinking water through adaptive boosting model
- The potential effect of the Rumex vesicarius water seeds extract treatment on mice before and during pregnancy on the serum enzymes and the histology of kidney and liver
- Impact of benzimidazole functional groups on the n-doping properties of benzimidazole derivatives
- Extraction of red pigment from Chinese jujube peel and the antioxidant activity of the pigment extracts
- Flexural strength and thermal properties of carbon black nanoparticle reinforced epoxy composites obtained from waste tires
- A focusing study on radioprotective and antioxidant effects of Annona muricata leaf extract in the circulation and liver tissue: Clinical and experimental studies
- Clinical comprehensive and experimental assessment of the radioprotective effect of Annona muricata leaf extract to prevent cellular damage in the ileum tissue
- Effect of WC content on ultrasonic properties, thermal and electrical conductivity of WC–Co–Ni–Cr composites
- Influence of various class cleaning agents for prosthesis on Co–Cr alloy surface
- The synthesis of nanocellulose-based nanocomposites for the effective removal of hexavalent chromium ions from aqueous solution
- Study on the influence of physical interlayers on the remaining oil production under different development modes
- Optimized linear regression control of DC motor under various disturbances
- Influence of different sample preparation strategies on hypothesis-driven shotgun proteomic analysis of human saliva
- Determination of flow distance of the fluid metal due to fluidity in ductile iron casting by artificial neural networks approach
- Investigation of mechanical activation effect on high-volume natural pozzolanic cements
- In vitro: Anti-coccidia activity of Calotropis procera leaf extract on Eimeria papillata oocysts sporulation and sporozoite
- Determination of oil composition of cowpea (Vigna unguiculata L.) seeds under influence of organic fertilizer forms
- Activated partial thromboplastin time maybe associated with the prognosis of papillary thyroid carcinoma
- Treatment of rat brain ischemia model by NSCs-polymer scaffold transplantation
- Lead and cadmium removal with native yeast from coastal wetlands
- Characterization of electroless Ni-coated Fe–Co composite using powder metallurgy
- Ferrate synthesis using NaOCl and its application for dye removal
- Antioxidant, antidiabetic, and anticholinesterase potential of Chenopodium murale L. extracts using in vitro and in vivo approaches
- Study on essential oil, antioxidant activity, anti-human prostate cancer effects, and induction of apoptosis by Equisetum arvense
- Experimental study on turning machine with permanent magnetic cutting tool
- Numerical simulation and mathematical modeling of the casting process for pearlitic spheroidal graphite cast iron
- Design, synthesis, and cytotoxicity evaluation of novel thiophene, pyrimidine, pyridazine, and pyridine: Griseofulvin heterocyclic extension derivatives
- Isolation and identification of promising antibiotic-producing bacteria
- Ultrasonic-induced reversible blood–brain barrier opening: Safety evaluation into the cellular level
- Evaluation of phytochemical and antioxidant potential of various extracts from traditionally used medicinal plants of Pakistan
- Effect of calcium lactate in standard diet on selected markers of oxidative stress and inflammation in ovariectomized rats
- Identification of crucial salivary proteins/genes and pathways involved in pathogenesis of temporomandibular disorders
- Zirconium-modified attapulgite was used for removing of Cr(vi) in aqueous solution
- The stress distribution of different types of restorative materials in primary molar
- Reducing surface heat loss in steam boilers
- Deformation behavior and formability of friction stir processed DP600 steel
- Synthesis and characterization of bismuth oxide/commercial activated carbon composite for battery anode
- Phytochemical analysis of Ziziphus jujube leaf at different foliar ages based on widely targeted metabolomics
- Effects of in ovo injection of black cumin (Nigella sativa) extract on hatching performance of broiler eggs
- Separation and evaluation of potential antioxidant, analgesic, and anti-inflammatory activities of limonene-rich essential oils from Citrus sinensis (L.)
- Bioactivity of a polyhydroxy gorgostane steroid from Xenia umbellata
- BiCAM-based automated scoring system for digital logic circuit diagrams
- Analysis of standard systems with solar monitoring systems
- Structural and spectroscopic properties of voriconazole and fluconazole – Experimental and theoretical studies
- New plant resistance inducers based on polyamines
- Experimental investigation of single-lap bolted and bolted/bonded (hybrid) joints of polymeric plates
- Investigation of inlet air pressure and evaporative cooling of four different cogeneration cycles
- Review Articles
- Comprehensive review on synthesis, physicochemical properties, and application of activated carbon from the Arecaceae plants for enhanced wastewater treatment
- Research progress on speciation analysis of arsenic in traditional Chinese medicine
- Recent modified air-assisted liquid–liquid microextraction applications for medicines and organic compounds in various samples: A review
- An insight on Vietnamese bio-waste materials as activated carbon precursors for multiple applications in environmental protection
- Antimicrobial activities of the extracts and secondary metabolites from Clausena genus – A review
- Bioremediation of organic/heavy metal contaminants by mixed cultures of microorganisms: A review
- Sonodynamic therapy for breast cancer: A literature review
- Recent progress of amino acid transporters as a novel antitumor target
- Aconitum coreanum Rapaics: Botany, traditional uses, phytochemistry, pharmacology, and toxicology
- Corrigendum
- Corrigendum to “Petrology and geochemistry of multiphase post-granitic dikes: A case study from the Gabal Serbal area, Southwestern Sinai, Egypt”
- Corrigendum to “Design of a Robust sliding mode controller for bioreactor cultures in overflow metabolism via an interdisciplinary approach”
- Corrigendum to “Statistical analysis on the radiological assessment and geochemical studies of granite rocks in the north of Um Taghir area, Eastern Desert, Egypt”
- Corrigendum to “Aroma components of tobacco powder from different producing areas based on gas chromatography ion mobility spectrometry”
- Corrigendum to “Mechanical properties, elastic moduli, transmission factors, and gamma-ray-shielding performances of Bi2O3–P2O5–B2O3–V2O5 quaternary glass system”
- Erratum
- Erratum to “Copper(ii) complexes supported by modified azo-based ligands: Nucleic acid binding and molecular docking studies”
- Special Issue on Applied Biochemistry and Biotechnology (ABB 2021)
- Study of solidification and stabilization of heavy metals by passivators in heavy metal-contaminated soil
- Human health risk assessment and distribution of VOCs in a chemical site, Weinan, China
- Preparation and characterization of Sparassis latifolia β-glucan microcapsules
- Special Issue on the Conference of Energy, Fuels, Environment 2020
- Improving the thermal performance of existing buildings in light of the requirements of the EU directive 2010/31/EU in Poland
- Special Issue on Ethnobotanical, Phytochemical and Biological Investigation of Medicinal Plants
- Study of plant resources with ethnomedicinal relevance from district Bagh, Azad Jammu and Kashmir, Pakistan
- Studies on the chemical composition of plants used in traditional medicine in Congo
- Special Issue on Applied Chemistry in Agriculture and Food Science
- Strip spraying technology for precise herbicide application in carrot fields
- Special Issue on Pharmacology and Metabolomics of Ethnobotanical and Herbal Medicine
- Phytochemical profiling, antibacterial and antioxidant properties of Crocus sativus flower: A comparison between tepals and stigmas
- Antioxidant and antimicrobial properties of polyphenolics from Withania adpressa (Coss.) Batt. against selected drug-resistant bacterial strains
- Integrating network pharmacology and molecular docking to explore the potential mechanism of Xinguan No. 3 in the treatment of COVID-19
- Chemical composition and in vitro and in vivo biological assortment of fixed oil extracted from Ficus benghalensis L.
- A review of the pharmacological activities and protective effects of Inonotus obliquus triterpenoids in kidney diseases
- Ethnopharmacological study of medicinal plants in Kastamonu province (Türkiye)
- Protective effects of asperuloside against cyclophosphamide-induced urotoxicity and hematotoxicity in rats
- Special Issue on Essential Oil, Extraction, Phytochemistry, Advances, and Application
- Identification of volatile compounds and antioxidant, antibacterial, and antifungal properties against drug-resistant microbes of essential oils from the leaves of Mentha rotundifolia var. apodysa Briq. (Lamiaceae)
- Phenolic contents, anticancer, antioxidant, and antimicrobial capacities of MeOH extract from the aerial parts of Trema orientalis plant
- Chemical composition and antimicrobial activity of essential oils from Mentha pulegium and Rosmarinus officinalis against multidrug-resistant microbes and their acute toxicity study
- Special Issue on Marine Environmental Sciences and Significance of the Multidisciplinary Approaches
- An insightful overview of the distribution pattern of polycyclic aromatic hydrocarbon in the marine sediments of the Red Sea
- Antifungal–antiproliferative norcycloartane-type triterpenes from the Red Sea green alga Tydemania expeditionis
- Solvent effect, dipole moment, and DFT studies of multi donor–acceptor type pyridine derivative
- An extensive assessment on the distribution pattern of organic contaminants in the aerosols samples in the Middle East
- Special Issue on 4th IC3PE
- Energetics of carboxylic acid–pyridine heterosynthon revisited: A computational study of intermolecular hydrogen bond domination on phenylacetic acid–nicotinamide cocrystals
- A review: Silver–zinc oxide nanoparticles – organoclay-reinforced chitosan bionanocomposites for food packaging
- Green synthesis of magnetic activated carbon from peanut shells functionalized with TiO2 photocatalyst for Batik liquid waste treatment
- Coagulation activity of liquid extraction of Leucaena leucocephala and Sesbania grandiflora on the removal of turbidity
- Hydrocracking optimization of palm oil over NiMoO4/activated carbon catalyst to produce biogasoline and kerosine
- Special Issue on Pharmacology and metabolomics of ethnobotanical and herbal medicine
- Cynarin inhibits PDGF-BB-induced proliferation and activation in hepatic stellate cells through PPARγ
- Special Issue on The 1st Malaysia International Conference on Nanotechnology & Catalysis (MICNC2021)
- Surfactant evaluation for enhanced oil recovery: Phase behavior and interfacial tension
- Topical Issue on phytochemicals, biological and toxicological analysis of aromatic medicinal plants
- Phytochemical analysis of leaves and stems of Physalis alkekengi L. (Solanaceae)
- Phytochemical and pharmacological profiling of Trewia nudiflora Linn. leaf extract deciphers therapeutic potentials against thrombosis, arthritis, helminths, and insects
- Pergularia tomentosa coupled with selenium nanoparticles salvaged lead acetate-induced redox imbalance, inflammation, apoptosis, and disruption of neurotransmission in rats’ brain
- Protective effect of Allium atroviolaceum-synthesized SeNPs on aluminum-induced brain damage in mice
- Mechanism study of Cordyceps sinensis alleviates renal ischemia–reperfusion injury
- Plant-derived bisbenzylisoquinoline alkaloid tetrandrine prevents human podocyte injury by regulating the miR-150-5p/NPHS1 axis
- Network pharmacology combined with molecular docking to explore the anti-osteoporosis mechanisms of β-ecdysone derived from medicinal plants
- Chinese medicinal plant Polygonum cuspidatum ameliorates silicosis via suppressing the Wnt/β-catenin pathway
- Special Issue on Advanced Nanomaterials for Energy, Environmental and Biological Applications - Part I
- Investigation of improved optical and conductivity properties of poly(methyl methacrylate)–MXenes (PMMA–MXenes) nanocomposite thin films for optoelectronic applications
- Special Issue on Applied Biochemistry and Biotechnology (ABB 2022)
- Model predictive control for precision irrigation of a Quinoa crop