禾穀類の葉に於けるビタミンB1の生成に関する研究-1-
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概要
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We have determined periodically the quantity of vitamin B1 in the leaf, ear and stem of the rice-plant during the fruiting-period. The vitamin was also determined in such parts of the rice-plant, from which the ear-necks or leaves were cut off. The result has shown that vitamin B1 is synthesized in the leaf, transferred into the ear and reserved in the rice-kernel. In the rice-leaf vitamin B1 is physiologically active and takes the combined form for the most part, and in the rice-ear or kernel it takes the free form for the most part. Vitamin B1 in the rice-leaf is synthesized most actively at the end of September when the carbon assimilation in the rice-leaf is the most prominent in Kyoto district. Using the leaf-extract of the rice-plant or barley, we have studied the mechanism of synthesis of vitamin B1 from the forms of pyrimidine and thiazole, and found that the vitamin synthesized only when one of cysteine, glutathione and l-ascorbic acid, which is considered to make redox potential negative in living tissue, exists.
- 社団法人 日本農芸化学会の論文