Comparison of Biochemical Changes in kefirs Produced from Organic and Conventional Milk at Different Inoculation Rates of kefir Grains
Journal Title: Journal of Food Science and Nutrition Therapy - Year 2016, Vol 2, Issue 1
Abstract
The purpose of this study was to assess effects of milk variety (organic and conventional) and the inoculation rate (0.2 g 100 g-1 and 0.5 g 100 g-1) as kefir grains on organic acids, volatile organic compounds (VOCs) and free amino acids (FAAs) as well as basic chemical composition of kefir. Total organic acids (10.2 g kg-1), total FAA (0.007 g 100 g-) and VOCs such as fatty acids (0.123 g kg-1) and benzene-containing components (0.066 g kg-1) were higher in conventional milk kefir than those (9.54 g kg-1, 0.006 g kg-1, 0.095 g kg-1and 0.042 g kg-1, respectively) in organic milk kefir. Increase in inoculation rate of kefir grains was directly proportional to increases in succinic and lactic acids, VOCs acetaldehyde, ethanol, ethyl acetate, benzene derivatives, free fatty acids C4, C6 and total FAAs especially proline, tyrosine, cysteine and valine amino acids. As a result, the most biochemical changes in kefir samples showed considerably differences depending on the both inoculation rate of grains and milk origin, and panelists liked kefir made from organic milk with 0.2% inoculation rate as grains due to probably the low lactic acid (6.43 g kg-1), toluene (0.004 g kg-1), butanoic acid (0.010 g kg-1), total FAA (0.006 g kg-1) and the high carbohydrate (54.84 g kg-1) concentrations.
Authors and Affiliations
Güler Zehra, Tekin Ali, Park Young W
Keywords
Related Articles
- EP ID EP544974
- DOI 10.17352/jfsnt.000003
- Views 58
- Downloads 0
Antioxidant activity and nutritional value of Citrus limetta and Ananas comosus pomace
Pulp waste from two fruits, Citrus limetta and Ananas comosus were analysed for in vitro antioxidant activity, total carbohydrate and pectin content and ascorbic acid. Total polyphenols determined in terms of catechol eq...
Drinking Milk Behavior and Bone Health among the Elderly
WHO report that in 2002 there were an estimated 605 million older persons in the world, nearly 400 million of whom were living in low-income countries, by 2025, the number of older persons worldwide is expected to reach...
Investigation of Structural Features of Prunes (Prunus domestica) Insoluble Dietary Fibers
Structural characteristics of dietary fibers are closely related to its biological functions in the human body. Previously, soluble dietary fibers from prunes were extracted and characterized. In this work, structural an...
Serum levels of Vitamin A and Atopic Rhinoconjunctivitis in Swedish adolescents
Aim: Vitamin A plays a role in mucosal immunity and tolerance, but the association between vitamin A status and allergy is still unclear. The aim of the study was to analyze the levels of vitamin A in serum from adolesce...
Vitamin D - A Probable Performance Boosting Mediator in Athletes
Vitamin D positively influences athletic performance by improving strength, power, speed, cardio respiratory fitness, reaction time, coordination, and body composition. Debatable opinion exists regarding the exact role o...