Dietary Fiber Content and Its Variation Factor of Domestic and Foreign Soybeans.

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  • 国産・外国産大豆の食物繊維含量と変動要因
  • コクサン ガイコクサン ダイズ ノ ショクモツ センイ ガンリョウ ト ヘンドウ ヨウイン

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Soluble (SDF), insoluble (IDF), and total dietary fiber (TDF) contents were determined in soybeans cultivated in different countries, i.e. Japan, U.S.A., China, Brazil, Paraguay and Argentina in 1992 to1994, and further their variation in five apanese cultivars in 1993 was evaluated. On the average value on dry matter basis of soybeans, SDF was observed significantly high in soybeans from Japan (1.88%), U.S.A. (1.50%) and China (1.61%), and IDF and TDF were comparable in all the samples sted. The ratio of IDF to SDF was ranged from 9 (Japan) to 15 (Brazil). Coefficient of variation (CV) was large in SDF and small in IDF and TDF in the samples of all countries. Among the Japanese cultivars, the CV values of SDF differed distinctly, i. e. mall in Akishirome and Tamahomare, and large in Enrei and Fukuyutaka. On SDF measurement, protein contents of heresidue were high in Enrei andFukuyutaka, and low in Akishirome and Tamahomare. The CV value of SDF in the cultivars correlated positively with the protein content of the residue which also correlated positively with the protein content of soybeans. From these results, the variation of SDF content was proved to be influenced by the protein content of soybeans. The same tendency was observed on the residue of IDF, but the CV values were small. Accordingly, it is considered that the differences between SDF and IDF in the CV value were attributable to the protein content ratio in the residue, namely, the ratio in IDF was small. On the correlation between dietary fiber contents and other measured values, following negative correlations were observed; SDF with oil value of soybeans, IDF and TDF withprotein value of soybeans, and IDF with 100-seed-weight. Negative correlations were also observed on IDF and TDF with the protein content of each residue. In conclusion, the protein content of soybeans influenced on IDF and TDF values, but not on SDF value. Ash content of each residue is not correlated to SDF, IDF, and TDF values.

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