New Metalloanthocyanin from Blue Petals of Salvia uliginosa

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  • MIZUNAGA Takemitsu
    Keisen College of Horticulture Institute of Environmental Science for Human Life, Ochanomizu University Faculty of Human and Social Studies, Keisen University
  • SAWAMURA Megumi
    Keisen College of Horticulture
  • YOSHIOKA Satomi
    Keisen College of Horticulture
  • SONE Yasuko
    Institute of Environmental Science for Human Life, Ochanomizu University
  • OTSUKA Yuzuru
    Institute of Environmental Science for Human Life, Ochanomizu University

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  • サルビア・ウリギノーサの青色花弁の新規メタロアントシアニン

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Abstract

A blue pigment complex was isolated from the blue flowers of Salvia uliginosa. The absorption spectrum of its aqueous solution had three maxima at 645, 589 and 314 nm. The blue pigment did not permeate a cellulose membrane, and contained magnesium as the metallic component, but not manganese, aluminum, zinc, calcium or iron. The blue pigment was composed of acetylated malonyl awobanine (Ishikawa, T. et al., Phytochemistry, 52, 517-521 (1999)), apigenin 7-cellobioside-4'-glucoside, and magnesium. This composition was confirmed by an in vitro synthesis of the blue color from its component parts. No blue color was formed without magnesium. These results show the blue color of the flower is manifested by a metalloanthocyanin containing magnesium as the chelating metal. There was no difference in the blue pigment formation among apigenin 7-cellobioside-4'-glucose, apigenin 7-cellobioside, and apigenin 7-glucoside. This blue pigment has potential use as a food colorants.

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