广西壮药薄荷色素的提取及其理化性质研究

Research on extraction and physicochemical properties of pigment from Mentha haplocalyx Briq. in Guangxi

目的研究薄荷色素的提取最佳条件和理化性质。方法采用蒸馏水提取法从薄荷中提取色素,用紫外分析法研究所提取色素的稳定性。结果色素在370 nm处有最大吸收峰,水溶性良好。结论 pH值对此色素的稳定性有明显影响,对热稳定性较差,但色素耐氧化剂、还原剂较强。苯甲酸钠、醋酸、蔗糖、葡萄糖食品添加剂对薄荷色素的稳定性无明显影响,但在柠檬酸存在下,对色素的稳定性有明显影响。在7种金属离子中,Fe2+,Cu2+使该色素变色,且Fe2+对色素有破坏作用。其他金属离子对色素几乎无影响。

Objective To study the optimal extraction condition and phsicochemical properties of pigment from Mentha haplocalyx Briq.Methods The pigment was extracted from Mentha haplocalyx Briq.with distilled water,and ultraviolet spectrum was used to analyze the pigment stability.Results The pigment had the maximum absorption peak at 370 nm,with good water solubility.Conclusion pH value can influence stability of this pigment obviously.This pigment had poor thermal stability,better oxidative resistance and deoxidation.Sodium benzoate,acetic acid,sucrose,glucose food additives had no obvious influence on the stability of this pigment,in addition to citric acid.The pigment from Mentha haplocalyx Briq.showed stable phsicochemical property to most of the metal ions with the exception of Fe2 ＋and Cu2 ＋,so it is better not to store this pigment in ironware and copperware.