1. Enrichment of phenolics and free radical scavenging property of wheat koji prepared with two filamentous fungi.
- Author
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Bhanja T, Kumari A, and Banerjee R
- Subjects
- Aspergillus classification, Coculture Techniques, Food Microbiology, Food, Fortified analysis, Species Specificity, Aspergillus metabolism, Food, Fortified microbiology, Free Radical Scavengers chemistry, Free Radicals chemistry, Phenols chemistry, Triticum chemistry, Triticum microbiology
- Abstract
In the present study, total phenolic content and antioxidant property of wheat (54% ethanolic extract) was drastically enhanced when fermented with two GRAS filamentous fungi, Aspergillus oryzae and Aspergillus awamori nakazawa. A. oryzae yielded significant (P<0.05) amounts of phenolic compounds, DPPH* (2,2-diphenyl-1-picrylhydrazyl) and ABTS*(+) [2,2'-azinobis (3-ethylbenzothiazoline-6-sulfonic acid)] scavenging properties on 4th day of incubation compared to A. awamori on 5th day of incubation. A linear correlation was observed between total phenolic contents and activities of three different carbohydrate hydrolyzing enzymes (alpha-amylase, beta-Glucosidase and xylanase) produced by A. oryzae. However, in case of A. awamori nakazawa, only two enzymes (xylanase and beta-glucosidase) were mainly responsible for the release of phenolics. This study demonstrated that fermented wheat grain is a better source of phytochemicals compared to non-fermented wheat. In addition, different carbohydrate cleaving enzymes are responsible for the improvement of phytochemical properties of fermented wheat.
- Published
- 2009
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