Colour effects of co-pigmentation of anthocyanins revisited - 2. A colorimetric look at the solutions of cyanin co-pigmented by rutin using the CIELAB scale
Colour effects of co-pigmentation of anthocyanins revisited - 2. A colorimetric look at the solutions of cyanin co-pigmented by rutin using the CIELAB scale
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DOI：
10.1016/s0308-8146(99)00088-6
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发表时间：
1999-08-01
期刊：
影响因子：
8.8
通讯作者：
Gonnet, JF
中科院分区：
文献类型：
--
作者：
Gonnet, JF
光谱测量（380-780 nm）进行了224模型解决方案的花青色素共同色素的黄酮醇芦丁在pH值2.5和5.5之间。溶液的颜色表示为CIELAB标度中的比色坐标，使用L*（亮度）C*（色度）和h（色调角）符号（对于D 65/10度CIE光源/观察者条件）。与以前的报告相反，所有最强烈的共着色的解决方案，虽然表现出最强的红移的λ（最大）没有显示最蓝的色调;相反，即泛黄，效果观察到在最低的花青苷浓度的共着色的解决方案。共着色的增色效应总是导致溶液的亮度降低，同时分别对于低或高颜料浓度的溶液，色度增加或降低。基于在每个共颜料与颜料比率下的总颜色CIELAB差异的幅度（Δ E*），在pH 3.5下观察到共着色的最强烈效果，除了在最高颜料含量（pH 4.5）下的溶液;讨论了在pH 2.5和5.5之间在增加共颜料与颜料比率下的色差的演变。色差计算还表明，在连续增加的共颜料与颜料的比例下，在最有色的溶液中观察到最大的颜色阶跃在低值（0.5或1：1），而在较少有色的溶液中观察到最高值（高达8-16：1）。在描述的颜色效果的共同色素对花青素，本比色方法的结果和那些先前报道的基础上的光谱数据在λ（最大）之间的差异进行了讨论。只有第一个-通过考虑整个可见波长范围内的光谱变化，并使用CIELAB系统中指定的三个颜色属性的心理测量相关性-正确地描述了人眼感知的颜色变化。(C)1999 Elsevier Science Ltd.保留所有权利。
Spectral measurements (380-780 nm) were performed on 224 model solutions of cyanin co-pigmented by the flavonol rutin at pH between 2.5 and 5.5. The colour of the solutions was expressed as colorimetric co-ordinates in the CIELAB scale using the L* (lightness) C* (chroma) and h (hue angle) notation (for the D65/10 degrees CIE Illuminant/Observer condition). Contrary to previous reports, all the most intensely co-pigmented solutions, although exhibiting the strongest bathochromic of their lambda(max) did not displayed the bluest hues; an inverse, i.e. yellowing, effect was observed in the co-pigmented solutions at the lowest cyanin concentrations. The hyperchromic effect of co-pigmentation always caused a decreasing lightness of the solutions coupled with either an increasing or a decreasing chroma for those at low or high pigment concentrations respectively. Based on the amplitude of total colour CIELAB differences (Delta E*) at each co-pigment to pigment ratio, the most intense effects of co-pigmentation were observed at pH 3.5, except for the solutions at the highest pigment content (pH 4.5); the evolution of colour differences at increasing co-pigment to pigment ratios at pH between 2.5 and 5.5 are discussed. Colour differences calculations also showed that the maximum colour steps at successive increasing co-pigment to pigment ratios were observed at low values (0.5 or 1:1) in the most coloured solutions and at the highest values (up to 8-16:1) in the less coloured ones. In describing the colour effect of co-pigmentation on anthocyanins, the discrepancies found between the results of the present colorimetric approach and those previously reported based on spectral data at the lambda(max) only are discussed. Only the first one-by considering the spectral variations over the complete range of visible wavelengths and using the psychometric correlates of the three attributes of colour specified in the CIELAB system-correctly describes the colour variations as these are perceived by the human eye. (C) 1999 Elsevier Science Ltd. All rights reserved.