P-40 ベニバナ花弁色素のキノカルコン及びフラボノイド色素(ポスター発表の部)

概要

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Carthamus tinctorious L. is well known from early times as one of source plants of red pigments. So far a red pigment being called as carthamin(1) and several yellow pigments from the petals have been reported by several groups. It is characteristic all the pigments to have a common quinochalcone-C-glycoside structure. Recently, we disclosed the structure of precarthamin(2), a precursor of carthamin(1), and the translocation process of 2 into 1. Those facts let us propose a possible biogenetic pathway into carthamin from chalcone. (Fig. 1) Since it was considered safflor yellow B to be a potent candidate as a precursor of 2, 3 was treateed with the crude enzyme preparation from the petals to examine the formation of 1. However, the formation of 1 was not detected on the UV/VIS spectra of the reaction mixture. On the other hand, it was clearly observed at a similar treatment of 2. (Fig. 2) To search the precursor of precarthamin the separation and purification of minor conponents from petals was carried out. Consequently, a new precursor of 2 and a flavonol glycoside containing glucuronic acid and rahmnose were isolated, but their structures are still unresolved. The constituents of petals of the yellow and white flower plants of C. tinctorious, which did not produce both 1 and 2, were also exsamined for comparison with those of a wild type plant being unable to produce both the compounds.
天然有機化合物討論会の論文
1995-09-01