Copigments in the blueing of sepal colour of Hydrangea macrophylla |
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Authors: | Kôsaku Takeda Rieko Kubota Chizuko Yagioka |
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Institution: | Department of Biology, Tokyo Gakugei University, Koganei, Tokyo 184, Japan |
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Abstract: | From blue sepals of Hydrangea macrophylla, copigments which show a blueing effect on the hydrangea anthocyanin were isolated and identified as 3-p-coumaroylquinic acid and 3-caffeoylquinic acid. 5-Caffeoylquinic acid (chlorogenic acid) which was also found in the blue sepals, however, did not show such a blueing effect though it acted as a copigment. Likewise, the 4-esters of p-coumaroyl- and caffeoylquinic acids (not found in sepals) produced purple rather than blue colours. The facts suggest that the stereostructures of 3-p-coumaroyl- and 3-caffeoylquinic acids are effective for molecular interaction between the p-coumaroyl or caffeoyl residue in the compounds and the anthocyanin. The anthocyanin in red and blue sepals of hydrangea was confirmed to be delphinidin 3-monoglucoside. |
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Keywords: | Saxifragaceae copigmentation blueing sepal colour anthocyanin 3-caffeoylquinic acid |
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