Membrane fouling is the major drawback of membrane-based technologies because it will lead to severe flux declines and the need to clean or replace the fouled membrane. Typical membrane foulants include protein and polysaccharide (PS). We develop surface-enhanced Raman spectroscopy (SERS) as a new tool to investigate the fouling propensity of three different proteins and one PS. A simple strategy is employed by comparing the relative SERS band intensities of different proteins and PS on a glass slide and after membrane filtration. The sequence of the fouling propensity is concluded as PS>myoglo-bin榦valbumin >BSA. Compared with fluorescence-based techniques, the narrow, well-resolved Raman band, especially the use of a same excitation line and laser power, endows SERS the ability to compare the fouling propensity in a facile way.%膜在运行过程中形成的膜污染会引起严重的膜通量下降,从而使得膜必须清洗甚至更换,是膜技术的主要缺点.典型的膜污染物质包括蛋白和多糖.本文发展表面增强拉曼光谱作为一种新的工具研究蛋白和多糖对聚偏二氟乙烯(PVDF)膜的膜污染能力.通过比较三种不同蛋白和多糖在玻璃片上和经过膜过滤之后SERS相对强度的变化,可迅速简便地判断出膜污染能力,即多糖(海藻酸钠)＞血红蛋白＞卵蛋白＞小牛血清蛋白.与基于荧光的技术相比,拉曼谱峰窄、光谱分辨率高、尤其是使用相同的激发光和激光功率就可以获得多种物质的SERS信号,使得SERS可以简便地判断不同物质的膜污染能力.
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