反应萃取法分离水中L-色氨酸和L-赖氨酸Separation of L-tryptophan and L-lysine in Aqueous Solution with Reactive Extraction
杨新妮,张剑,杨平
摘要(Abstract):
以分光光度计为检测手段,通过对二甲氨基苯甲醛法和茚三酮法联用,建立了一种测定L-赖氨酸和L-色氨酸混合水溶液中两种氨基酸的含量的方法。以二(2-乙基己基)磷酸为萃取剂、正辛醇为溶剂构成的溶剂萃取体系,研究了水中L-色氨酸和L-赖氨酸在有机相中萃取分配行为。结果表明:在pH为2.0时,水相中的L-赖氨酸经有机相两次萃取后可得到纯品,平均回收率为77.2%。负载于有机相中的氨基酸,用等体积的1mol/L HCl反萃,再调反萃液酸度至pH为2.0,重复上述操作一次,可得色氨酸纯品,其平均回收率为76.0%。
关键词(KeyWords): L-色氨酸;L-赖氨酸;二(2-乙基己基)磷酸;溶剂萃取;分离纯化
基金项目(Foundation): 湖北省教育厅重点科研项目(D20121806)
作者(Author): 杨新妮,张剑,杨平
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