Cereal Chem 56:356 - 358.  |  VIEW ARTICLE
Composition of Water-Soluble Hemicelluloses in Rice Bran from Flour Growing Areas.

R. R. Mod, E. J. Conkerton, R. L. Ory, and F. L. Normand. Copyright 1979 by the American Association of Cereal Chemists, Inc. 

Water-soluble hemicellulose from the bran of two rice varieties (Starbonnet and Calrose), the former grown in three locations and the latter in one, was isolated, purified, and characterized for sugar and amino acid compositions. All hemicelluloses contained the same sugars (rhamnose, arabinose, xylose, mannose, galactose, and glucose), as well as some protein, hexuronic acid, and ferulic acid. Arabinose was the predominant sugar in all rice samples, with the arabinose to xylose ratio ranging from 2.8:1 to 5.4:1. The amino acid patterns are not typical of those from plant storage proteins, as indicated by large amounts of hydroxyproline and lower amounts of arginine and dicarboxylic acids. Disc gel electrophoresis of one hemicellulose suggests that the protein may be chemically bound to the carbohydrate moiety.