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Determination of quorum-sensing signal substances in water and solid phases of activated sludge systems using liquid chromatography–mass spectrometry

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Journal of Environmental Sciences 2018年第7期30卷 85-94页

作者： Yuepeng Sun Kai He Qidong Yin Shinya Echigo Guangxue Wu Yuntao Guan Key Laboratory of Microorganism Application and Risk Control (MARC) of Shenzhen Graduate School at Shenzhen Tsinghua University Department of Environmental Engineering Graduate School of Engineering Kyoto University

The detection of acyl homoserine lactones（AHLs） in activated sludge is essential for clarifying their function in wastewater treatment processes. An LC–MS/MS method was developed for the detection of AHLs in both the aqueous and solid phases of activated sludge. In addition, the effects of proteases and extracellular polymeric substances（EPS） on the detection of AHLs were evaluated by adding protease inhibitors and extracting EPS,respectively. Recoveries of each AHL were improved by adding 50 μL of protease inhibitor,and recoveries were also improved from 0 to 56.9% to 24.2%–105.8% by EPS *** the developed method to determine the type and concentration of AHLs showed that C4-HSL, C6-HSL, C8-HSL and 3-oxo-C8-HSL were widely detected in a suspended activated sludge system. The dominant AHL was C8-HSL, with a highest concentration of304.3 ng/L. C4-HSL was mainly distributed in the aqueous phase, whereas C6-HSL, C8-HSL and 3-oxo-C8-HSL were preferentially distributed in the sludge phase.

关键词： Extracellular polymeric substances LC–MS/MS signal substances Protease inhibitor Quorum sensing

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