利用集成膜工艺澄清与浓缩紫甘蓝花青素

摘要

The objective of this study was to develop a membrane process, involving ultrafiltration (UF), nanofiltration (NF) and reverse osmosis (RO), for clarification and concentration of the red cabbage anthocyanins extract. The trans-membrane pressure (TMP) and axial feed flow rate (Qj) was evaluated according to the total recycle mode (TRM). The integrated membrane process was studied according to the batch mode (TBM). The total anthocyanins content (TACY) , pH value, total soluble solid (TSS) and color characteristics (CIE L a' b') were measured. The ceramic UF membrane showed better results than the polyether sulfone membrane in clarification, the optimal conditions were TMP=0.3 MPa and Qf =40 L/min using ceramic UF membrane module. NF membrane showed higher efficiency than RO membrane in concentration, the optimal conditions were TMP=1.0 MPa, Qf =25 L/min with NF membrane, and TMP=1.5 MPa, Qf =10 L/min with RO membrane. Both UF+NF and UF+RO membrane-based processes could be utilized to clarify and concentrate the anthocyanins extract. The research can provide a reference for non-thermal industrial production of clarified and concentrated natural bioactive compounds.%为实现紫甘蓝花青素活性成分水提液的高效浓缩,该文集成了超滤、纳滤和反渗透膜技术澄清、浓缩紫甘蓝花青素水提液的工艺.采用“总循环模式”和“批处理模式”研究优化操作工艺.测定总花青素、pH值、总可溶性固形物和颜色指标.澄清工艺中:无机陶瓷超滤膜效果较好,较佳工艺为:陶瓷膜、跨膜压力0.3 MPa、循环流量40 L/min.浓缩工艺中:纳滤膜工作效率略高于反渗透膜,纳滤和反渗透较佳参数分别为跨膜压力1.0 MP、循环流量25 L/min,跨膜压力1.47 MPa、循环流量10 L/min.2种工艺均可得到品质优越的花青素浓缩产品.因此逐级膜过滤可利用于花青素的澄清和浓缩,为天然活性成分水提物的非热澄清及浓缩产业化生产提供参考.