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

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Title Studies on Water Extractable Feruloyl Polysaccharides from Native and Germinated Rice (Oryza Sativa) and Ragi (Eleusine Coracana)
 
Creator Shyama Prasad Rao, R.
 
Subject 01 Rice
05 Ragi (Finger Millet)
28 Polysaccharide Chemistry
 
Description 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.
 
Date 2005-09
 
Type Thesis
NonPeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://ir.cftri.com/359/1/Shyamaprasad.pdf
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.