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Studies on Water Extractable Feruloyl Polysaccharides from Native and Germinated Rice (Oryza Sativa) and Ragi (Eleusine Coracana)

Shyama Prasad Rao, R. (2005) Studies on Water Extractable Feruloyl Polysaccharides from Native and Germinated Rice (Oryza Sativa) and Ragi (Eleusine Coracana). PhD thesis, University of Mysore.

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Abstract

Carbohydrates are the principal components/macronutrients of food,and apart from providing bulk of the caloric intake they play a variety of functions in human food and nutrition. In particular, arabinoxylans have attracted the attention of many researchers because of the complexity of their structure-function relationships. They are the major non-starch polysaccharides in cereals and represent bulk of the soluble and insoluble dietary fiber (unavailable/un-digestible carbohydrates) intake in human food. Nutritionally, dietary fibers/non-starch polysaccharides are known to exert many physiological/metabolic effects in reducing the risks of diseases (known as diseases of lifestyle/civilization) such as diabetes, obesity, atherosclerosis, hypertension, constipation, diverticulosis, colorectal cancer and so on. Due to their various physicochemical properties, water soluble non-starch polysaccharides (NSP), mainly arabinoxylans, are also known to have many functional roles in human food. Although general structure of arabinoxylans is known from many cereals, detailed investigations pertaining to the water soluble arabinoxylans/feruloyl arabinoxylans (feraxans) are sparse. Moreover, large variations in the fine structure of arabinoxylans isolated from various cereals are observed and they in turn may have influence on their physicochemical/functional roles. Thus for better understanding of fine structure of arabinoxylans and for their utilization in human food and nutrition with precise functional effects, arabinoxylans are characterized from diverse sources and conditions.The present study is taken up as there was no detailed investigation on the water soluble feraxans from rice and ragi, the major cereal and millet respectively. Structural and functional characterizations of water soluble feraxans from these two cereal grains were investigated with the following objectives: (a) Isolation and preliminary characterization of water extractable feruloyl polysaccharides from native and germinated rice and ragi, (b) Fractionation and purification of water extractable feruloyl polysaccharides, (c) Structural characterization of purified polysaccharides using methylation, GLC-MS analysis, Smith degradation and 13C-NMR and (d) Functional properties of water soluble feruloyl polysaccharides i.e., viscosity, gelling and foam stabilization and effect on dough characteristics, determination of their antioxidant and prebiotic activity in vitro.

Item Type: Thesis (PhD)
Uncontrolled Keywords: Ragi Rice water extractable feruloyl polysaccharides polysaccharides
Subjects: 600 Technology > 08 Food technology > 21 Cereals > 01 Rice
600 Technology > 08 Food technology > 21 Cereals > 05 Ragi (Finger Millet)
500 Natural Sciences and Mathematics > 04 Chemistry and Allied Sciences > 28 Polysaccharide Chemistry
Divisions: Dept. of Biochemistry
Depositing User: Food Sci. & Technol. Information Services
Date Deposited: 22 Dec 2006
Last Modified: 28 Dec 2011 09:26
URI: http://ir.cftri.com/id/eprint/359

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