Cereal Chem 57:382 - 386.  |  VIEW ARTICLE
Lipids and Fatty Acid Composition of Riso 1508 and Normal Barley.

R. S. Bhatty and B. G. Rossnagel. Copyright 1980 by the American Association of Cereal Chemists, Inc. 

The crude lipid contents of Riso 1508 and Bonanza barleys were determined by six procedures. After purification, Riso contained 100, 65, 84, 88, 116, and 76% more lipids than did Bonanza for procedures 1- 6, respectively. Riso averaged more palmitic and oleic but less linoleic acids than did Bonanza. The neutral lipids formed 74.9 and 65.2%, the glycolipids 7.3 and 25.6%, and the phospholipids 17.8 and 9.2% in Riso and Bonanza, respectively. In Riso, the embryo (including the scutellum) formed, on the average, 5.3% of the total seed weight, compared to 3.0% in Bonanza and 3.5% in Fairfield. The embryo contributed 23.8% of the total lipids in Riso, compared to 22.3-22.6% in Bonanza and Fairfield, when total lipids were determined by procedure 6 (gas chromatography). With ether as the solvent, the contribution of embryo to total lipids was 28.0% for Riso and 37.3% for Fairfield. The rest of the lipids were present in the endosperm fraction. The data suggested that an increased embryo size in Riso may not be totally responsible for a higher lipid content in this barley compared to that in Bonanza and Fairfield. Compared to the endosperm, the embryo in all three varieties contained two to three times more linolenic acid but less linoleic acid, the major fatty acid. Riso contained about two and one-half times more lipoxygenase activity than did Bonanza.