- Method for dyeing keratinous fibres using a monohydroxyindole or dihydroxyindole and a non-oxidizing aromatic carbonyl derivative and dyeing agent
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The present invention relates to a method for dyeing keratinous fibers, characterized in that the following are applied to the fibers: a) a composition (A) containing, in a medium appropriate for dyeing, at least one monohydroxyindole or dihydroxyindole, this application being preceded or followed by the application of b) a composition (B) containing, in a medium appropriate for dyeing, at least one aromatic carbonyl derivative chosen from hydroxyacetophenones, hydroxybenzophenones, 2-hydroxy-1,4-benzoquinones, hydroxy-1,4-naphthoquinones,amino-1,4-naphthoquinones,hydroxy-9,10-anthraquinones and amino-9,10-anthraquinones. It also relates to the dyeing agents for carrying it out.
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- BIOSYNTHESIS OF MANGIFERIN IN ANEMARRHENA ASPHODELOIDES BUNGE. II. C-GLUCOSYLATION OF MANGIFERIN
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A benzophenone, maclurin-1,3,5-14C3 (3), was efficiently incorporated into C-glucosylxanthones (mangiferin (1) and isomangiferin (2)) of Anemarrhena asphodeloides without randomization, but the labelled aglycone of 1 and 2 (1,3,6,7-tetrahydroxyxanthone-2,4,9a-14C3) (4) was essentially not incorporated.Furthermore, the incorporation of phenylalanine-3-14C into 1 and 2 was clearly suppressed by the addition of non-labelled maclurin (3) to the precursor solution.These results indicate that C-glucosylation of 1 and 2 occurs at the stage of maclurin (3), prior to the formation of the xanthone nucleus, and that 1 and 2 may be biosynthesized via 3-C-glucosylmaclurin (6).A biosynthetic route is proposed for mangiferin (1) and related C-glucosylxanthones.Keywords-Anemarrhena asphodeloides Bunge; biosynthesis; C-glucosylation of xanthone; mangiferin; isomangiferin; maclurin-1,3,5-14C3; 1,3,6,7-tetrahydroxyxanthone-2,4,9a-14C3; phloroglucinol-2,4,6-14C3.
- Fujita, Masao,Inoue, Takao
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p. 2482 - 2486
(2007/10/02)
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