2种天然絮凝剂对薄荷水提液的絮凝研究和比较

为了克服传统中药提取工艺中有效成分损失率高、生产成本高、工艺复杂等缺点,采用天然无毒的高分子絮凝剂壳聚糖和矿物絮凝剂膨润土对薄荷水提液进行净化除杂.利用间歇试验方法,以絮凝率和总黄酮损失率作为指标,考察了絮凝剂用量、温度、搅拌速度等因素对絮凝效果的影响,并利用正交试验确定了薄荷水提液的最佳絮凝条件.结果表明,壳聚糖絮凝效果优于膨润土,当壳聚糖投加量为0.741g·L-1,絮凝温度30℃,搅拌速度40r·min-1时,絮凝率可达到92.75%,总黄酮损失率为10.75%.在此基础上,通过絮凝前后粒径比较及絮体形态分析,对中药絮凝机理进行了深入探讨.

Comparison and study of the flocculation effect of peppermint water-extraction solution by two natural flocculants

In order to overcome the deficiencies of high losing rate of effective components,high production cost,complex process,a natural,non-toxic high polymer flocculant chitosan and natural mineral flocculant bentonite was used to flocculate peppermint water-extraction solution.Based on the intermittent experiment method,let flocculation rate and flavanones loss rate be index,the influence of flocculant,temperature,mixing speed on flocculation for the effect of flocculant were discussed,and the optimum technological parameters were ascertained by orthogonal experiment.Results showed that the flocculation effect of chitosan was better than bentonit when the flocculant concentration was 0.741 g·L-1,operating temperature was 30℃ and mixing speed was 40 r·min-1,the flocculation rate reached 92.75% and the flavanones loss rate was 10.75%.On this basis through analyzing the flocs and particle size of water-extraction solution before and after flocculation,the flocculation mechanism of herbal medicine was discussed thoroughly.