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IJCT Vol.12(1) [January 2005] >


Title: Effect of gamma radiation on solution viscosity of galactomannans: Influence of galactose : mannose ratio
Authors: Issarani, Roshan
Nagori, B P
Keywords: Depolymerization
gamma irradiation
galactomannas
locust bean
fenugreek
guar
Issue Date: Jan-2005
Publisher: CSIR
IPC CodeG05D 24/00
Abstract: Various seed galactomannans differ from each other in G:M ratios, molecular weight and fine structure, w.r.t. the distribution of galactose side groups on the main chain. In the present investigation, galactomannan samples of fenugreek, guar and locust bean having different G:M ratios of 1:1, 1:2 and 1:4 respectively, were exposed to different doses of gamma radiation. Dispersions of the resulting products were prepared and their viscosities were measured. A considerable fall in their viscosities was noted. The lower viscosity is obtained due to the production of lower molecular weight products, indicative of depoly¬≠merization. It was observed that galactomannan having the highest galactose : mannose (G:M) ratio of 1:1 resisted depoly¬≠merization the most in comparison to the galactomannan possessing the lowest G:M ratio of 1:4.
Page(s): 105-107
ISSN: 0975-0991 (Online); 0971-457X (Print)
Source:IJCT Vol.12(1) [January 2005]

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