2024-03-29T14:29:23Z
https://soar-ir.repo.nii.ac.jp/oai
oai:soar-ir.repo.nii.ac.jp:00017642
2023-03-31T05:38:03Z
1702:1721:1728
柿及小柿の葉のビタミンCについて
Studies on Vitamine C (I-ascorbic acid) in the Leaves of Kaki (Japanese Persimmon)
平林, 貴邦
高野, 悦子
It has been said that the juice from the leaves of Kaki (japanese persimmon) boiled with water contains a large amount of vitamine C (l-ascorbic acid). But the measurement of vitamine C in the leaves of Kaki has not been carried out and the results have not been found in literatures. The present paper dealed with the contents of vitamine C in the leaves of Kaki by the indophenol method using 2,6-dichlorophenol indophenol-Na and the hydrazine method using 2,4-dinitrophenyl hydrazine. Mixture of 2 g. of the sample and 100 ml. of 2.5% HPO₃ was strongly homogenized for 2 min. in mixer and filtered by glass-filter (17G₂). Vitamine C in the filtrate was measured by the indophenol method, and it in the filtrate diluted with 9 volumes of 5% HPO₃ was done by the hydrazine method. From the experiment, it was made sure that the leaves of Kaki contained a large amount of vitamine C (500-1100 mg. per 100 g. of leaves) and the content was varied according to the variation of seasons ; the maximum content was about 1100 mg. or more per 100 g. of leaves in July and August. The contents of vitamine C in the leaves dried by various methods (natural drying, ultra-red ray heating and freezing vacuum drying) were also measured.
Article
信州大学教養部紀要. 第二部, 自然科学 3: 15-21(1969)
departmental bulletin paper
信州大学教養部
1969-02-28
application/pdf
信州大学教養部紀要. 第二部, 自然科学
3
15
21
0583-0613
AN0012116X
https://soar-ir.repo.nii.ac.jp/record/17642/files/Liberal_arts_S03-04.pdf
jpn