Changes in Some Quality Properties of Kefir during Storage and Inhibition Effect of Water Soluble Extracts on Angiotensin-I Converting Enzyme Purified by Human Plasma
-
Tuba Erkaya
,
Aykut Öztekin
Abstract
Angiotensin converting enzyme (ACE)-inhibitory activity in water soluble extracts (WSEs) of kefir was investigated. Kefir was produced traditionally using kefir grains and stored at refrigerated temperature for 20 days. During storage period (on 1, 5, 10, 15 and 20 days) in vitro ACE-inhibitory activity in WSEs was determined. ACE was purified from human plasma to determine kinetic parameters. Purified ACE had a specific activity of 20.75 EU.mg−1, a yield of 16.6% with a factor of 22100. The inhibition effects of kefir on ACE increased at 15 storage days than other storage days. Some microbiological and physicochemical characteristics of kefir were also studied. Counts of presumptive LAB on M-17 and presumptive LAB on MRS in the kefir were about 108 CFU.ml−1 throughout the storage period. Yeast counts were lower than lactic acid bacteria counts and the average of the counts was approximately 106 log CFU.ml−1. Storage period had a significant effect (P < 0.05) on titratable acidity and pH values. On the contrary, it had no significant effect (P > 0.05) on viscosity and serum separation values of kefir.
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©2015 by De Gruyter
Articles in the same Issue
- Frontmatter
- Research Articles
- Numerical Solution of a Nonlinear Diffusion Model for Soybean Hydration with Moving Boundary
- Simulation and Performance of a Solar Drying Unit with Storage for Aromatic and Medicinal Plants
- Preparation of Nano-curcumin with Enhanced Dissolution Using Ultrasonic-Assisted Supercritical Anti-solvent Technique
- Effect of Various Concentration of β-Cyclodextrin Inclusion Complexes Containing trans-Cinnamaldehyde by Molecular Self-Assembly
- Effects of Amount of Batter in Baking Cup on Muffin Quality
- Influence of Tapioca Starch on Thermal Properties of Wheat Flour-Based Batter and Quality of Fried Battered Chicken Wingsticks
- Clarification of Date Syrup by Activated Carbon: Investigation on Kinetics, Equilibrium Isotherm, and Thermodynamics of Interactions
- Changes in Some Quality Properties of Kefir during Storage and Inhibition Effect of Water Soluble Extracts on Angiotensin-I Converting Enzyme Purified by Human Plasma
- Drying Characteristics and Assessment of Physicochemical and Microstructural Properties of Dried Culinary Banana Slices
- Multi-Objective Optimization of the Pasteurization Process of Pumpkin Cubes Packaged in Glass Jars
- Mathematical Modeling of Thin-Layer Solar Drying for Yarrow, Coriander and Hollyhock
- Shorter Communication
- Drying Kinetics of American Ginseng Slices in Thin-layer Air Impingement Dryer
Articles in the same Issue
- Frontmatter
- Research Articles
- Numerical Solution of a Nonlinear Diffusion Model for Soybean Hydration with Moving Boundary
- Simulation and Performance of a Solar Drying Unit with Storage for Aromatic and Medicinal Plants
- Preparation of Nano-curcumin with Enhanced Dissolution Using Ultrasonic-Assisted Supercritical Anti-solvent Technique
- Effect of Various Concentration of β-Cyclodextrin Inclusion Complexes Containing trans-Cinnamaldehyde by Molecular Self-Assembly
- Effects of Amount of Batter in Baking Cup on Muffin Quality
- Influence of Tapioca Starch on Thermal Properties of Wheat Flour-Based Batter and Quality of Fried Battered Chicken Wingsticks
- Clarification of Date Syrup by Activated Carbon: Investigation on Kinetics, Equilibrium Isotherm, and Thermodynamics of Interactions
- Changes in Some Quality Properties of Kefir during Storage and Inhibition Effect of Water Soluble Extracts on Angiotensin-I Converting Enzyme Purified by Human Plasma
- Drying Characteristics and Assessment of Physicochemical and Microstructural Properties of Dried Culinary Banana Slices
- Multi-Objective Optimization of the Pasteurization Process of Pumpkin Cubes Packaged in Glass Jars
- Mathematical Modeling of Thin-Layer Solar Drying for Yarrow, Coriander and Hollyhock
- Shorter Communication
- Drying Kinetics of American Ginseng Slices in Thin-layer Air Impingement Dryer
