离子交换树脂分离纯化加纳籽中5-羟基色氨酸

Isolation and purification of 5-hydroxytryptophan in extract from seeds of Griffonia simplicifolia by ion-exchange resin

目的研究离子交换树脂对加纳籽提取液中5-羟基色氨酸的吸附分离性能,筛选出具有较高选择吸附性的离子交换树脂。方法考察8种阴阳离子交换树脂的静态吸附性能,以树脂的吸附量、解吸率、吸附速率、吸附温度作为考察指标,选出最优的离子交换树脂,并考察不同pH值、上样速度、上样液质量浓度、洗脱剂浓度、洗脱速度对树脂吸附性能的影响。结果 001×7阳离子交换树脂吸附分离效果最佳,001×7树脂吸附分离的条件为:在常温下,上样液5-羟基色氨酸质量浓度为10.8 mg/mL,调pH为3.5,以4.0 mL/min的上样速度上样,以3倍树脂体积的7.0%氨水以3.0 mL/min的洗脱速度进行洗脱,洗脱液浓缩结晶后获得的产品中5-羟基色氨酸质量分数大于99.0%,灰分小于1.0%,产品的平均得率为7.95%,产品质量符合要求。结论 001×7阳离子交换树脂吸附分离5-羟基色氨酸综合性能最好,是较为理想的介质,适合于99%规格5-羟基色氨酸的规模化生产。

Objective To research the adsortpion and separation function of ion-exchange resin on 5-hydroxytryptophan （5-HTP） in extract from the seeds of Griffonia simplicifolia and to screen the ion-exchange resin with high selective adsorption. Methods The static adsorptive properties of eight different types of ion-exchange resins were evaluated using adsorptive content, desorption rate, adsorption rate, and adsorption temperature as indexes in order to optimize the resin. And the effects of different pH values, injection rates, injection concentration, eluent concentration, and elution rates on adsorptive properties of resins were investigated. Results The 001 × 7 cation exchange resin showed the best comprehensive adsorption property. The loading solution concentration was 10.8 mg/mL, the pH value was 3.5, the flow rate of loading solution was 4.0 mL/min, and 3BV 7.0% ammonia water solution in 3.0 mL/min velocity was used to elute. In this process, the product was obtained with the 5-HTP purity of greater than 99.0% and the ash content of less than 1.0%, product average yield was 7.95% and the product quality could meet the market demand. Conclusion The 001 ×7 cation exchange resin shows a better comprehensive adsorption property. It could be used to isolate and purify the 5-HTP for scale production.