Degradation of cereal bran polysaccharide-phenolic acid complexes by Aspergillus niger CFR 1105.

Shyamala, Hegde and Kavitha, S. and Varadaraj, M. C. and Muralikrishna, G. (2006) Degradation of cereal bran polysaccharide-phenolic acid complexes by Aspergillus niger CFR 1105. Food Chemistry, 96 (1). pp. 14-19. ISSN 0308-8146

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Abstract

Cereal brans such as wheat and rice are abundant sources for obtaining bioactive phenolic compounds such as ferulic and coumaric acids, in turn these can be bio-transformed into high value flavour compounds such as vanillin. <i>Aspergillus niger</i> CFR 1105, found to induce greater amounts of cell wall degrading enzymes, was inoculated into wheat and rice brans, and grown for 24, 48, 72 and 96 h to understand the degradation pattern of non-starch polysaccharides and phenolic acid complexes. Native wheat bran polysaccharides mainly consisted of arabinose, xylose, galactose, and glucose, in % of 27:39:2:30, with traces of mannose, whereas rice bran consisted of arabinose, xylose, galactose, and glucose in % of 9:27:31:32, respectively. Both the cereal bran arabinoxylans were degraded extensively by <i>A. niger</i> at 96 h, whereas the degradation of 1,3/1,4-β-d-glucans and cellulose was negligible. Bound phenolic acids of rice and wheat brans identified by HPLC were found to be mainly ferulic, coumaric, syringic acids in % of 93.6:6.3:0 (wheat), 34.7:55.8:9.5 (rice) and were drastically degraded/utilized at 96 h. The above results have indicated preferential degradation of arabinoxylans of wheat bran by <i>A. niger</i>, which can be exploited to obtain bioactive compounds such as ferulic acid.

Item Type:	Article
Additional Information:	Copyright of this article belongs to Elsevier
Uncontrolled Keywords:	Non-starch polysaccharides; Arabinoxylans; Ferulic acid; Vanillin; Fungal transformation
Subjects:	600 Technology > 08 Food technology > 21 Cereals > 01 Rice 600 Technology > 08 Food technology > 21 Cereals > 04 Wheat
Divisions:	Dept. of Biochemistry
Depositing User:	Food Sci. & Technol. Information Services
Date Deposited:	26 Apr 2007
Last Modified:	28 Dec 2011 09:27
URI:	http://ir.cftri.res.in/id/eprint/539

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