基于CIELab参数的葡萄酒基本花色苷与原儿茶酸的辅色评估

Evaluation of copigmentation of basic wine anthocyanins and protocatechuic acid based on CIELab parameters

模拟体系下采用CIELab方法对常见的5种单体花色苷辅色后的模拟溶液颜色变化进行了测定,用以研究不同结构花色苷在反应后的色泽特征和变化特点。试验发现,添加原儿茶酸的溶液可拥有更低的亮度、更高的红色值和视觉饱和度,并在高浓度条件下有明显的视觉差别。同时,在相同条件下,反应溶液的颜色变化与花色苷B环上的基团种类和数量有关,具有较多甲氧基基团的花色苷反应效果突出。该试验从颜色分析角度对不同结构花色苷参与的辅色反应进行了分析,对明晰不同结构花色苷辅色后的呈色特征,深入研究辅色反应机理提供数据参考。

As researches on copigmentation by different kinds of anthocyanins were limiting, CIELab method was used to investigate the color changes in simulated solution after copigmentation respectively with five common monoanthocyanins. The results showed that the solution supplemented with protocatechuic acid possessed lower brightness, higher red value and visual saturation and showed significant visual differences at high concentration. It was also found that the color change was related to the type and number of groups on the anthocyanin B ring and the effect was more outstanding for anthocyanins with more methoxy groups. This experiment provides reference for clarifying the coloration characteristics after copigmentation by different anthocyanins, as well as for studying the mechanisms of copigmentation.