Cereal Chem 62:252-258   |  VIEW ARTICLE
Comparative Studies on Cell Wall Preparations from Rice Bran, Germ, and Endosperm.

N. Shibuya, R. Nakane, A. Yasui, K. Tanaka, and T. Iwasaki. Copyright 1985 by the American Association of Cereal Chemists, Inc. 

Cell walls were prepared from bran, germ, and endosperm of japonica-type rice grains by successive extraction of protein and starch with sodium dodecyl sulfate-mercaptoethanol and 90% dimethyl sulfoxide. Scanning electron microscopy observation of these cell wall preparations suggested their different texture. Pectic substance was found in decreasing amounts in endosperm, germ, aleurone, and pericarp seed coat cell walls, respectively. Lignin was distributed in the reverse order. The presence of beta-(1-3), (1-4)-glucan was significant only in the endosperm cell walls, in contrast to findings for wheat and barley. More (1-5)- linked arabinose was detected in the germ cell walls, suggesting possible variation in the structure of pectic polysaccharides. All the cell wall preparations showed a high alpha-cellulose content compared to those from wheat and barley grains.