紫红色四季报春花色素的提取及稳定性研究

以紫红色四季报春花为原料提取色素,并对该色素的稳定性进行研究。结果表明,适宜的提取溶剂为pH=1的95%乙醇溶液,该色素在382 nm处有最大吸收峰;该色素热稳定性差,有较强的耐光性,耐氧化性,还原性差,在酸性条件下不稳定;金属离子Na+、K+、Mg2+、Zn2+对色素的影响较小,而Fe3+对该色素稳定性的影响较大;常用食品添加剂(葡萄糖、蔗糖、可溶性淀粉和柠檬酸)对该色素色泽无不良影响。

Extraction of Pigment from Primula Four Purple and Study of Its Stability

Pigment is extracted from purple primrose seasons as raw material,and its stability was studied.The results showed that the 95% ethanol solution with pH=1 was a better extraction solvent,the pigment had maximum absorption peak at 382 nm;the pigment had good light resistance,bad reduction and oxidation resistance,and was unstable under acid condition ;The metal ions Na＋、K＋、Mg2＋、Zn2＋have less effect on the pigment,but Fe3＋has larger effect on the stability of the pigment,while food additives（for example：glucose,sucrose,soluble starch and citric acid）,low valence metal ions had no negative effect.