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- W1688272683 abstract "Cereal Chern. 67(2):129-135 Rice varietal identification is important for breeding new varieties and for marketing varieties for specific uses. Previous identification methods were not satisfactory. We therefore analyzed rice prolamins (soluble in high concentrations of alcohol), salt-soluble proteins, and glutelins by reversed-phase high-performance liquid chromatography (RP-HPLC) to Identification of rice varieties is important during breeding and in commerce because varieties vary in cooking quality, taste, and nutritional value. Varieties cannot usually be identified by physical appearance, so other methods, such as those based on protein analysis, have been developed. Milled rice contains 1.7-7.6% alcohol-soluble prolamins, 0.3-9.9% albumins, 1.6-14.0% globulins, and 73-94% glutelins (depending on analytical method, genotype, and environment) (Cagampang et al 1966, Houston et al 1968, Lee et al 1968). In contrast, prolamins predominate in some other cereals. Investigators have characterized rice proteins by gel electrophoresis (Mandac and Juliano 1978, Villareal and Juliano 1978, Chauhan and Nanda 1984 Kusama et al 1984, Sarkar and Bose 1984), two-dimensional electrophoresis and electrofocusing (du Cros et a11979, Guo et a11986, Chen et aI1987), gel filtration chromatography (Iwasaki et al 1982), and reversed-phase (RP-) high-performance liquid chromatography(HPLC) (Lookhart et al 1987, Hussain et al 1989). Isozyme analysis may also identify varieties (Glaszmann 1987). Of these methods, two-dimensional electrophoresis best resolves proteins and differentiates genotypes but is difficult and slow. RP-HPLC effectively separates alcohol-soluble prolamins of many cereals, permitting varietal identification (Bietz et al 1984, Lookhart 1985, Marchylo and Kruger 1984). In rice, however, such analyses appear less useful, because prolamins are a minor fraction. Lookhart et al (1987) found close similarity among chromatograms of varieties analyzed by HPLC. An alternative extraction procedure was devised by Hussain et al (1989), permitting RP-HPLC differentiation of many varieties; in this work, proteins from all classes may be present. Because nonprolamin proteins are most plentiful in rice, we explored other methods for their analysis by RP-HPLC. We also extracted proteins by other solvents in our search of an improved method of varietal identification." @default.
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- W1688272683 date "1990-01-01" @default.
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- W1688272683 title "Rice Cultivar Identification by High-Performance Liquid Chromatography of Endosperm Proteins" @default.
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