9 天然物における分子会合の研究(I) : ツユクサの青色色素COMMELININの構造

概要

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Commelinin is a blue pigment which was reported to be composed of 2 molecules each of awobanin (A) (an anthocyanin) and flavocommelin (F) (a flavone) and 1 atom each of Mg and K. Its extraordinary stability and blue color were explained in terms of complex formation of Mg^<++> with A and F. We found, however, that commelinin is constructed from A and F in the absence of Mg^<++>. Molecular weight of commelinin was determined in 3M NaCl by centrifugation method to be 1400-5600, mainly 4100±400. A proposed structure of commelinin is shown in Fig. 2 and 3, in which A and F are associated to form a tight molecular complex. The driving force for the formation of the complex would be hydrophobic interactions between the aromatic rings of A and F, and covering the hydrophobic parts with glucose residues. The AF complexes further associate each other to form (AF)_2, (AF)_3, etc. Addition of F strongly retards the decomposition of commelinin in water, whereas Mg^<++> and A pseudobase have no effect. A mechanism is proposed for this phenomenon.
天然有機化合物討論会の論文
1976-09-20