西洋アサガオ"ヘブンリ-ブル-"の花の青色発現要因
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概要
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The pH of the blue petal juice of 'Heavenly Blue' morning glory was 6.88, while the pH of the white parts of the same petal tissues was 5.88. Rutin, caffeic acid and some metals, which were quantitatively detected in blue petal tissues, did not produce a significant bathochromic shift in the visible λmax of the main petal anthocyanin, dicaffeyl peonidin 3-sophorosido-5-glucoside. Spectral examinations showed that the high pH of the petal cells was the major factor in the blue pigmentation, and the color stability of the main petal anthocyanin could be attributed to its acyl group, caffeic acid. In contrast with the main petal pigment, its deacylated anthocyanin in Mcllvaine's buffer solutions at different pH was easily converted into a colorless pseudobase and besides into other compounds.
- 社団法人 日本農芸化学会の論文