Anthocyanin-aluminium and -gallium complexes in aqueous solution
Anthocyanin-aluminium and -gallium complexes in aqueous solution
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DOI：
10.1039/a603851d
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发表时间：
1997-02-01
期刊：
影响因子：
--
通讯作者：
Brouillard, R
中科院分区：
文献类型：
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作者：
Elhabiri, M;Figueiredo, P;Brouillard, R
在水溶液中，从花青素模型和天然花青素中提取的天然花色苷与铝、镓离子的络合作用进行了深入的研究。从pH为2-5的紫外可见光谱数据中，证实了络合物的存在，不仅涉及色素的有色形式，而且涉及无色形式，建立了计算相应稳定常数的理论处理方法。在整个工作过程中，所研究的颜料可分为两个系列，一个共用一个氰基发色团，另一个系列共用一个斑点，在两个系列中，根据糖基化和/或酰化的程度和类型来区分不同的色素，讨论了分子内效应，如花青素-铝络合物的共着色性以及丙二酸基的存在对这些络合物的形成的影响，这些结果对植物着色剂很重要，例如，已经发现了由于络合作用导致颜色放大的窄pH域。
Complexation of aluminium and gallium ions with synthetic anthocyanin models and natural anthocyanins extracted from the blue flowers of Evolvulus pilosus cv 'Blue Daze' and the violet flowers of Matthiola incana has been thoroughly investigated in aqueous solution, From UV-VIS spectroscopic data collected at pH 2-5, the presence of complexes, involving not only the coloured forms but also the colourless forms of the pigments is demonstrated, A theoretical treatment is developed for the calculation of the corresponding stability constants, The pigments studied throughout this work can be divided into two series, one sharing a cyanidin chromophore and the other a delphinidin one, Within both series, individual pigments are distinguished according to the degree and type of glycosylation and/or acylation, Intramolecular effects such as copigmentation of anthocyanin-aluminium complexes and the effect of the presence of a malonyl group on the formation of those complexes are discussed, These results are important to plant pigmentation and, for instance, a narrow pH domain in which colour amplification due to complexation is at a maximum has been found.