Cereal Chem 55:341 - 347.  |  VIEW ARTICLE
Distribution of Soluble Carbohydrates in Barley Grain at Late Stage of Maturity and Relation to Viscosity.

B. Gohl, M. Nilsson, and S. Thomke. Copyright 1978 by the American Association of Cereal Chemists, Inc. 

Layers of barley grain harvested at late maturity (19% moisture) were successively removed by abrasive milling. The fractions removed were extracted with 80% ethanol followed by extraction with phosphate- citrate buffer at pH 7.0. The distributions of crude protein, crude fat, and ash were determined in each fraction. The distributions of these proximate principles were essentially the same as in barley harvested early. The ethanol extracts contained mainly sucrose, together with stachyose, raffinose, glucose, fructose, glucitol, and myoinositol. The distribution of the ethanol-soluble carbohydrates within the barley kernel showed great similarity to those of barley harvested early. Acid hydrolysates of the buffer extracts contained mainly glucose, together with galactose, mannose, rhamnose, arabinose, and xylose. The decrease of viscosity of buffer extracts between early and late stages of maturity formed peaks at 45 and 75% abrasion. This coincided with maximal decrease of glucose in hydrolysates of buffer extracts.