Characteristics of Subcritical Water Extraction and Kinetics of Pentacyclic Triterpenoids from Dry Loquat (Eriobotrya japonica) Leaves
Abstract
In this study, pentacyclic triterpenoids (PTTs) were extracted from loquat leaves by subcritical water extraction (SWE) technique in a dynamic mode. The results revealed that PTTs yield increased up to 5.38±0.12 mg/g with the increasing temperature at 180 °C for corosolic acid (CA) and up to 7.20±0.11 mg/g at 200 °C for ursolic acid (UA) within experimental times. The optimum flow rates to obtain concentrated CA and UA extracts were found to be 33.33 and 41.67 mL/min, respectively. Furthermore, extraction temperatures strongly influenced the extraction rate as demonstrated by the rate constant of each temperature tested. Moreover, the kinetic rate constant decreased as the function of temperature indicating the yield of both CA and UA were significantly influenced by subcritical temperatures and extraction times.
Funding statement: This research has been financially supported by National Natural Science Foundation of China (Grant No. 31271946 and 31101287 and 973 projects from the Ministry of Science and Technology (Grant No. 2012CB720801).
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©2016 by De Gruyter
Artikel in diesem Heft
- Frontmatter
- Research Articles
- Effect of Combined Air-Drying-Osmotic Dehydration on Kinetics of Techno-functional Properties, Color and Total Phenol Contents of Lemon (Citrus limon. v. lunari) Peels
- Guava Osmotic Dehydration: Description by Two-Dimensional Diffusion Models Considering Shrinkage and Variations in Process Parameters
- Phenolic Compounds and Antioxidant Capacity of Brown Rice in China
- Characteristics of Subcritical Water Extraction and Kinetics of Pentacyclic Triterpenoids from Dry Loquat (Eriobotrya japonica) Leaves
- Variety Difference in Molecular Structure, Physico-chemical and Thermal Properties of Starches from Pigmented Rice
- Comparison of Two Ultrasonic Systems with Different Settings for Extraction of Capsaicinoids from Chili Peppers
- Moisture Dependent Dynamic Flow Properties of Coconut Flours
- Characterization and Antioxidant Activity of Flash-Assisted Extracted Dihydroquercetin from Wood Sawdust of Larix gmelinii Using a Response Surface Methodology
- Comparison of Drying Kinetics of Maize in Oven and in Pilot Silo Dryer: Influence on Moisture Content and Physical Characteristics
- Enzymatic-Assisted Microwave Extraction of Total Flavonoids from Bud of Chrysanthemum indicum L. and Evaluation of Biological Activities
Artikel in diesem Heft
- Frontmatter
- Research Articles
- Effect of Combined Air-Drying-Osmotic Dehydration on Kinetics of Techno-functional Properties, Color and Total Phenol Contents of Lemon (Citrus limon. v. lunari) Peels
- Guava Osmotic Dehydration: Description by Two-Dimensional Diffusion Models Considering Shrinkage and Variations in Process Parameters
- Phenolic Compounds and Antioxidant Capacity of Brown Rice in China
- Characteristics of Subcritical Water Extraction and Kinetics of Pentacyclic Triterpenoids from Dry Loquat (Eriobotrya japonica) Leaves
- Variety Difference in Molecular Structure, Physico-chemical and Thermal Properties of Starches from Pigmented Rice
- Comparison of Two Ultrasonic Systems with Different Settings for Extraction of Capsaicinoids from Chili Peppers
- Moisture Dependent Dynamic Flow Properties of Coconut Flours
- Characterization and Antioxidant Activity of Flash-Assisted Extracted Dihydroquercetin from Wood Sawdust of Larix gmelinii Using a Response Surface Methodology
- Comparison of Drying Kinetics of Maize in Oven and in Pilot Silo Dryer: Influence on Moisture Content and Physical Characteristics
- Enzymatic-Assisted Microwave Extraction of Total Flavonoids from Bud of Chrysanthemum indicum L. and Evaluation of Biological Activities