大孔树脂分离纯化洛神花花色苷的研究
Separation of anthocyanins from roselle by macroporous resins
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摘要: 比较了NAK-9,X-5,AB-8,DM130,DA201,Sp850,XAD-7型大孔树脂对洛神花花色苷的吸附纯化效果,结果表明Sp850型大孔树脂对洛神花花色苷具有较好的吸附和解吸能力,在25℃条件下的吸附特征符合Langmuir等温吸附模型(R2=0.9961)。动态吸附和解吸研究表明,Sp850树脂吸附纯化洛神花花色苷的最佳参数为:上柱液溶液p H为2.0,上样流速2BV/h,此条件下每克Sp850树脂可处理14.3mg花色苷;洗脱剂为60%乙醇,解吸流速为2BV/h。可见光谱和HPLC分析可知纯化前后花色苷性质未发生变化,纯化后的洛神花花色苷纯度增加7.4倍,由5.8%变为36.8%,回收率达到64.9%。Abstract: The absorption and desorption properties of total roselle anthocyanins on macroporous resins including NAK-9,X- 5,AB- 8,DM130,DA201,Sp850 and XAD- 7 were compared. According to the results,Sp850 resin offered better absorption and desorption capacity for roselle anthocyanins than other resins,and its adsorption data at 25℃ fit the best to the Langmuir isotherm.Dynamic adsorption and desorption experiments were carried out on the Sp850 resin packed column to optimize the separation process of anthocyanins from roselle extracts. The optimum parameters for adsorption were as follows: sample p H2.0,flow rate 2BV / h,14.3mg anthocyanin / g resin;for desorption were: elution solvent 60% ethanol and flow rate 2BV / h. Based on the visible spectrum and HPLC results,the anthocyanin compositions didn't change through the separation process. After be treated with Sp850 resin,the anthocyanins content in the product was increased 7.4- fold from 5.8% to 36.8%,with a recovery yield of64.9%.