7-O-Methylated anthocyanidin glycosides from Catharanthus roseus |
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Authors: | Toki Kenjiro Saito Norio Irie Yuki Tatsuzawa Fumi Shigihara Atsushi Honda Toshio |
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Institution: | Laboratory of Floriculture, Faculty of Horticulture, Minami-Kyushu University, Takanabe, Miyazaki 884-0003, Japan. |
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Abstract: | Anthocyanins were isolated from orange-red flowers of Catharanthus roseus cv 'Equator Deep Apricot', and identified as rosinidin 3-O-6-O-(alpha-rhamnopyranosyl)-beta-galactopyranoside] (1), and also 7-O-methylcyanidin 3-O-6-O-(alpha-rhamnopyranosyl)-beta-galactopyranoside] (2) by chemical and spectroscopic methods. Pigment 1 was found to be a major anthocyanin in the flowers of this cultivar. By contrast, the distribution of rosinidin glycosides is very limited in plants, and reported only in the flowers of Primula. Pigment 2 was found in smaller concentrations, but its aglycone, 7-O-methylcyanidin, has been reported only once before, from the fruit of mango. |
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Keywords: | Catharanthus roseus Apocynaceae 7-O-Methylcyanidin 3-robinobioside Rosinidin 3-robinobioside Orange-red flower color |
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