Li Sheung-Yin, Schon Benjamin S, Travas-Sejdic Jadranka
Polymer Biointerface Centre, School of Chemical Sciences, The University of Auckland, 23 Symonds Street, Auckland CBD, Auckland, 1010, New Zealand.
The MacDiarmid Institute of Advanced Materials and Nanotechnology, Wellington, 6140, New Zealand.
Macromol Rapid Commun. 2020 Sep;41(18):e2000303. doi: 10.1002/marc.202000303. Epub 2020 Aug 7.
Cross-flow microfiltration, using a microporous membrane, is a well-established technique for wine clarification in oenology because of its cost-effectiveness and high-throughput. However, membrane fouling remains a significant issue for wine filtration in high-throughput systems. Herein, an approach for in situ real-time monitoring of fouling in filtration systems using a conductive filtration membrane and a model fluid for filtration is reported. The membrane is fabricated by embedding poly(3,4-ethylenedioxythiophene) into an electrospun sulfonated polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene microporous membrane, producing a conductive microfiltration membrane. Measurement of the resistance of the conductive membrane during filtration with the fouling solutions containing pectin, as one of the major foulants in unfiltered wine and pre-fermentation grape juice, shows a time- and concentration-dependent response. This work opens a door to new methodology for in situ monitoring of fouling processes in wine and juice filtration systems.
错流微滤使用微孔膜，由于其成本效益高和通量高，是酿酒学中葡萄酒澄清的成熟技术。然而，膜污染仍然是高通量系统中葡萄酒过滤的一个重大问题。本文报道了一种使用导电过滤膜和过滤模型流体对过滤系统中的污染进行原位实时监测的方法。该膜是通过将聚（3,4-乙撑二氧噻吩）嵌入电纺磺化聚苯乙烯-嵌段-聚（乙烯-无规-丁烯）-嵌段-聚苯乙烯微孔膜中制成的，从而制备出一种导电微滤膜。在用含有果胶的污染溶液进行过滤过程中，对导电膜的电阻进行测量，果胶是未过滤葡萄酒和发酵前葡萄汁中的主要污染物之一，结果显示出时间和浓度依赖性响应。这项工作为葡萄酒和果汁过滤系统中污染过程的原位监测开辟了新方法。
