16 メタロアントシアニンの分子組織化と発色(口頭発表の部)

概要

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The blue pigments, commelinin, from Commelina communis, and protocyanin, from Centaurea cyanus, are metal-complex anthocyanins, named a metalloanthocyanin. The exact molecular weight of commelinin (ca 8846), of which the structure has already been determined by crystallographic analysis, was succeeded directly to be measured by negative mode ESI-MS. Protocyanin was prepared from its components, succinylcyanin (Sucy), malonylflavone (Mafl), and ferric and magnesium ion. The composition of protocyanin was determined by ICP atomic analysis, ESR, Mossbauer spectra and ESI-MS to be [Sucy_6Mafl_6Fe^<3+>Mg^<3+>]. Protocyanin-like pigment was prepared from Al^<3+> instead of Fe^<3+>, then ^1H NMR was measured. The flavonid components were stacked tightly and the arrangement of their components is very similar to that of commelinin. It was larified that mechanism of blue color development of protocyanin arises from LMCT between Fe^<3+> and anhydrobase anion of Sucy by MCD measurement.
天然有機化合物討論会の論文
1994-09-20