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《Journal of Southwest China Normal University(Natural Science)》 1988-01
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STUDIES ON BIOCHEMICAL ANALYSIS OF NUTRITIONAL COMPOSITION IN STEM, LEAR AND STEM APEX OF YUSU 1, A NEWLY IMPROVED BREED OF SWEET POTATO

CHEN DINGFU YANG JIASI LI KUNPEI ZHANG QITANG  
In order to determine comprehensively the quality of Yusu 1, a newly improved breed of sweet potato, we have measured the nutritional composition of its stem, leaf and stem apex by biochemical analysis, and compared them with the corresponding parts of other two improved breeds, Su-potato-18 and Nong-Da-Hong, We have also compared some of their root tubers. The results indicate that, except some differences in the content of a few components, generally there is no obvious difference in the content of carbohydrate, thick protein, amino acid, and vitamin C. But the content of reducing sugar, soluble sugar and total sugar in the stem is always higher than that in the leaf in the same breed, and that in the leaf is always higher than that in the stem apex:think protein and amino acid are in general higher in the stem apex in the leaf, and those in the leaf are higher than those in the stem; and all are higher than those In the corresponding root tuber. The stem, the leaf, and the stem apex don't contain cy-steine. As for the content of vitamin C, it is always higher in the leaf than in the stem apex, and in the stem apex than in the stem. There is no obvious law about the content of calcium, phosphorus and iron in either the corresponding parts of the three different breeds or the stem, the leaf and the stem apex of the same breed. In the stem, the leaf and the stem apex of each breed, there are abundant calcium, phosphorus and iron, and the content is higher than that in the correspondng root tuber
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