Comparison of isoflavone contents in soybean and soybean products by HPLC
Journal Title: Journal of Analytical Bio-Science - Year 2012, Vol 35, Issue 4
Abstract
We investigated the differences in the content of aglycones and glucosides in commercial soybean food products. Furthermore, we examined the content of aglycones and glucosides to determine whether changes depended on conservation conditions. The isoflavone contents of soybean products were evaluated using high-performance liquid chromatography. The amounts of isoflavone in soybeans, daidzin, genistin, daidzein and genistein were in the range of 430 to 473, 624 to 717, 48 to 68 and 41 to 58μg/g food, respectively. The average levels of total isoflavone in fermented soybeans were relatively high, where the lowest levels were found in tofu and soy milk. The glucosides could not be detected using bean miso samples. However, daidzein and genistein exhibited remarkably high values. When the samples of miso and fermented soybeans were shaken for 48 hours below 37℃, a decrease in aglycones and an increase in aglycones were evident.
Authors and Affiliations
Yuichi Maekawa
Keywords
Related Articles
- EP ID EP130216
- DOI -
- Views 72
- Downloads 0
Development of assays for measuring HBV- and HCV-related markers
Several decades have passed since HBV and HCV were identified, and many assays for measuring HBV/HCV-related markers have annually developed. These assays have contributed to the development of kinetic analysis, diagnosi...
Reaction mechanism of a protein error in the presence of in organic salt: proof from an absorption spectrum of color development
Color development by protein error decreases in the presence of in organic salt, and its reaction mechanism is proposed. In this paper, whether or not the absorption spectra of this color reaction indicates the character...
Basics of carnitine in health foods−Analysis, biochemistry and physiological functions−
Carnitine is essential for fatty acid metabolism. Since it causes fatty acids to enter the mitochondria where they are subjected to β-oxidation. Carnitine is present in all animal species. In humans, carnitine levels are...
Evaluation of serum B-type natriuremic peptide (BNP) and plasma N-terminal pro-BNP(NT-proBNP) levels with heart failure in children
We have evaluated the NT-proBNP levels in serum and the BNP levels in plasma for heart failure (HF) among neonates and children. Both NT-proBNP and BNP levels for HF patients less than 5 years old were higher (NT-proBNP...
Analysis based on the chemical equilibrium regarding the color development ratio between albumins varying in a straight seed in the dye-binding method
Reaction conditions that make the color development of human serum albumin (HSA) and bovine serum albumin (BSA) equal was analyzed based on their chemical equilibrium. When there are reaction conditions of KPDH<KPDB a...