天然孔雀草脂溶性色素稳定性的研究

通过对不同环境条件下孔雀草脂溶性色素特征吸光度值变化的研究,探讨了其在不同光照、温度、pH、氧化剂或还原剂、金属离子、山梨酸钾、糖等环境条件下的稳定性.实验结果表明:天然孔雀草脂溶性色素对热稳定,糖溶液、氧化剂、防腐剂山梨酸钾和低浓度还原剂对其影响较小,对光敏感,在碱性条件下不稳定,Na^ 、Mg^2 引起孔雀草色素的损失较大.

Study on stability of the natural fat-soluble pigment of tagetes patula L.

Stability of the fat-soluble pigment from tagetes patula L.under different conditions such as heating, temperatures, pH, oxidants and reducing agents, metal ions, potassium sorbate and saccharides was discussed by investigating its specific absorbance. Results showed that the pigment was thermally stable; saccharides, oxidants, preservatives or reducing agents of low concentration have little effect on its stability; while it was sensitive to light and unstable when pH>7.0 with presence of Na + and Mg 2+ ,which lead to pigment loss.