基于“絮凝-陶瓷膜耦合技术”的甜菊糖苷纯化工艺研究

摘要

Steviol glycosides were separated and purified from stevia water extracts by flocculation coupling ceramic ultrafiltration membrane process.Effects on membrane separation performance under differents amount of FeSO4 were studied.Additionally,separation performance of the membrane with high feed concentration under the optimum amount of FeSO4 was studied.The results showed that the optimum amount of FeSO4 is 0.5％.Under the optimum amount,membrane separation performance was stable even when the feed was concentrated 10 times.The average flux was 182 L/(m2 · h),the yield of steviol glycosides was 86.1％ and the purity was 89.3 ％.Comparing with other processes,flocculation coupling ceramic ultrafiltration membrane process could effectively reduce cost of production,increase yield of steviol glycosides,improve quality of the product.%采用絮凝-陶瓷超滤膜耦合技术,对甜叶菊水提液中的甜菊糖苷进行分离纯化.考察了絮凝剂FeSO4添加量对膜分离性能的影响.在较优的絮凝剂FeSO4添加量下,研究了陶瓷超滤膜在料液高倍浓缩时的分离性能,并将絮凝-陶瓷超滤膜耦合技术与其它生产工艺进行了对比.结果表明,在絮凝剂FeSO4较优的添加量0.5％下,陶瓷膜将料液浓缩10倍,膜分离性能稳定,过程平均通量为182 L/(m2·h),糖苷收率为86.1％,纯度为89.3％.在甜菊糖苷生产过程中,使用絮凝-陶瓷超滤膜耦合技术可以有效地降低生产成本、提高糖苷收率、提升产品品质.