双水相萃取法提取条斑紫菜R-藻红蛋白工艺

摘要

On the basis of one-factor-at-a-time experiments, an L16（43） orthogonal array design was performed to optimize process conditions for aqueous two-phase extraction of R-phycoerythrin from Porphyra yezoensi. The effects of PEGs of different molecular weights, PEG 4000 dosage, the concentration of Na2SO4 as the phase-forming salt and ionic strength on the extraction of R-phycoerythrin were examined. The results indicated that the optimal aqueous two-phase extraction conditions were PEG 4000 as the phase-forming polymer at 6%, Na2SO4 concentration 13%, NaCl concentration 1.5%. After the optimized aqueous two-phase extraction, the purity of R-phycoerythrin was increased to 0.727 from 0.187, showing a 2.25-fold increase. Therefore, aqueous two-phase extraction is more suitable for R-phycoerythrin extraction than ammonium sulfate precipitation.%以条斑紫菜为原料,采用双水相萃取法对R-藻红蛋白进行提取,讨论不同工艺条件聚合物分子大小及质量分数、成相盐质量分数、离子强度对藻红蛋白的提取效果,通过正交试验确定藻红蛋白的最佳提取条件。结果表明当6%聚乙二醇4000、13%硫酸钠、1.5%氯化钠时,蛋白纯度可由粗液的0.187上升至0.727,是传统硫酸铵盐析法的2.25倍,说明双水相萃取法比硫酸铵盐析法更适合提取R-藻红蛋白。