红梗水芋红色素的提取及性质研究

Study on extraction and characterization of red pigment from colocasia esculenla schott

研究了红梗水芋红色素的提取条件和理化性质,结果表明,用料液比1∶20(g/mL)、pH1的20%乙醇作提取剂、在60℃恒温浸提10min,提取效率较好。红梗水芋红色素属花色素苷类色素,pH值对色素影响明显,80℃以内比较稳定。光照能加快色素降解。金属离子Na+、Ca2+、AL13+、Zn2+对色素色泽无影响,而Cu2+、Fe3+、Pb2+有不良影响。色素抗氧化能力较差而耐还原性能稍好。蔗糖、葡葡糖和盐等添加剂对色素无影响。

Physieo--chemical properties and extractions of the red pigment of Colocasia esculenla Schott were investigated. Results showed that good yield of pigment could be obtained by 20% C2H5OH solution of pill at 60℃ for 10rain with the solid--liquid ratio 1 ： 20 g/mL. The Colo- casia esculenla Schott red pigment is classified to anthocyanins, for which pH had significant effect on the tone of pigment. The pigment is stable to heat under 80℃. Under sunlight, degradation of the pigment could be accelerated, but regardless of uhraviolet light. Metallic ions Na^＋ , Ca^2＋ ,Zn^2＋ ,AL^3＋ had no effect on the tone of pigment, but Cu^2＋ ,Fe^3＋ ,Pb^2＋ had severe disadvantageous effect. This kind of pigment has better endurance capability against reducing agent, but it has less resistance capability against oxidizing agent. Addition of glucose, sucrose had no effect on the pigment.