コムギ1粒の胚乳断面色の測定による粉色の評価法の開発

DOI 日本農学文献記事索引 Web Site Web Site 被引用文献4件 参考文献22件

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  • Development of a method for evaluating the flour color by determining the color of cross-section of endosperm from a grain of wheat.
  • コムギ１粒のはい乳断面色の測定による粉色の評価法の開発
  • コムギ 1ツブ ノ ハイニュウ ダンメンショク ノ ソクテイ ニ ヨル フンショク ノ ヒョウカホウ ノ カイハツ

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We examined a method for evaluating flour color by determining the color of the cross-section of wheat endosperm unaffected by mixed bran. Samples were prepared as follows. The grains were cut crosswise into 2mm-thick slices, the seed coat was removed and the grains were soaked in distilled water. The color value, lightness (L), redness or greenness (a) and yellowness or blueness (b) of the cross-section of the samples were determined using a microspectrocolorimeter. The L value was stabilized after 4hours from soaking in distilled water. The three color values for the crosssection were highly correlated with those of the pure endosperm powder devoid of mixed bran. Furthermore, the flour color estimated from the color of the crosssection was consistent with the flour color determined by the standard method (color of flour paste determined with a spectrophotometer) for yellowness, but not for L value, because the estimation by the standard method was affected by mixed bran. There was a high correlation with a and b in the color of the cross-section of the endosperm from 24 Japanese and foreign varieties. The hue of the endosperm color of these varieties was similar (slightly greenish yellow), and the degree of yellowness of the endosperm increased in proportion to the chromaticity. Furthermore, the highly positive correlation between the chromaticity suggested that b, suggesting that b is useful for selecting for endosperm yellowness. We compared the color of the pure endosperm powder and the color of the flour obtained by milling using a Brabender test mill. Mixed bran lowered the L value of flour and the degree of decrease was different with the variety. Some varieties and strains had a high L value in the cross-section, irrespective of the hardness and protein content. Strains with a bright endosperm color could be selected in both soft and hard wheat, irrespective of protein content.

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