耦合基于超滤的工艺从枸杞水提物中浓缩酚类化合物。

Coupling Ultrafiltration-Based Processes to Concentrate Phenolic Compounds from Aqueous Goji Berry Extracts.

机构信息

Institute on Membrane Technology, ITM-CNR, Via P. Bucci 17/C, 87036 CS Rende, Italy.

Department of Engineering and of the Environment, University of Calabria, Via P. Bucci 45/A, 87036 CS Rende, Italy.

出版信息

Molecules. 2020 Aug 18;25(16):3761. doi: 10.3390/molecules25163761.

DOI:10.3390/molecules25163761

PMID:32824751

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7547376/

Abstract

In this work, a membrane-based process for the purification and concentration of antioxidant compounds from aqueous Goji ( L.) berry extracts was investigated. The aqueous extract was previously clarified with hollow fiber ultrafiltration (UF) membranes in order to remove suspended solids and β-carotene and to produce a clarified extract enriched in phenolic compounds. Then, three UF flat sheet polyamide membranes with a molecular weight cut-off (MWCO) in the range 1000-3500 Da were tested to purify and concentrate phenolic compounds from the clarified extract. The effect of MWCO and transmembrane pressure (TMP) on the performance of selected membranes in terms of productivity and selectivity towards total dissolved solids (TDS), total phenolic compounds (TPC), total carbohydrates (TC) and total antioxidant activity (TAA) was evaluated. Experimental results indicated that the 2500 Da membrane exhibited a lower fouling index, higher cleaning efficiency, lower rejection towards carbohydrates (lower than 30%) and higher rejection towards phenolic compounds (higher than 50%) in comparison to the other investigated membranes. The inclusion of a diafiltration process in the treatment of the clarified extract with this membrane in a spiral-wound configuration improved the concentration of sugar compounds in the permeate stream and increased the purification of phenolic compounds in the retentate fraction.

摘要

本工作研究了一种基于膜的方法，用于从枸杞（Lycium barbarum）浆果水提物中纯化和浓缩抗氧化化合物。水提物先前已用中空纤维超滤（UF）膜澄清，以去除悬浮固体和β-胡萝卜素，并生产富含酚类化合物的澄清提取物。然后，测试了三种 UF 平板聚酰胺膜，其分子量截留（MWCO）在 1000-3500 Da 范围内，以从澄清提取物中纯化和浓缩酚类化合物。MWCO 和跨膜压力（TMP）对所选膜在总溶解固体（TDS）、总酚化合物（TPC）、总碳水化合物（TC）和总抗氧化活性（TAA）的生产率和选择性方面的性能的影响进行了评估。实验结果表明，与其他研究的膜相比，2500 Da 膜的污染指数更低，清洗效率更高，对碳水化合物的截留率（低于 30%）更低，对酚类化合物的截留率（高于 50%）更高。在螺旋卷绕构型中，在处理澄清提取物时，将渗滤过程与该膜结合使用，可以提高渗透物中糖化合物的浓度，并增加保留物中酚类化合物的纯化度。