Bronsted Catalyzed Hydrolysis of Microcystin-LR by Siderite

doi:10.1021/acs.est.7b06096

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	Bronsted Catalyzed Hydrolysis of Microcystin-LR by Siderite
	Fang, Yanfen 1,2; Zhou, Wei 1; Tang, Changcun 1; Huang, Yingping 2; Johnson, David Mark 2; Ren, Zhiyong Jason 2,3; Ma, Wanhong 2,4
刊名	ENVIRONMENTAL SCIENCE & TECHNOLOGY
	2018-06-05
卷号	52 期号:11 页码:6426-6437
ISSN号	0013-936X
DOI	10.1021/acs.est.7b06096
英文摘要	Six naturally occurring minerals were employed to catalyze the hydrolysis of microcystin-LR (MC-LR) in water. After preliminary screening experiments, siderite stood out among these minerals due to its higher activity and selectivity. In comparison with kaolinite, which is known to act as a Lewis acid catalyst, siderite was found to act primarily as a Bronsted acid catalyst in the hydrolysis of MC-LR. More interestingly, we found that the presence of humic acid significantly inhibited catalytic efficiency of kaolinite, while the efficiency of siderite remained high (similar to 98%). Reaction intermediates detected by LC-ESI/MS were used to indicate cleavage points in the macrocyclic ring of MC-LR, and XPS was used to characterize siderite interaction with MC-LR Detailed analysis of the in situ ATR-FTIR absorption spectra of MC-LR indicated hydrogen bonding at the siderite-water-MC-LR interface. A metastable ring, involving hydrogen bonding, between surface bicarbonate of siderite and an amide of MC-LR was proposed to explain the higher activity and selectivity toward MC-LR. Furthermore, siderite was found to reduce the toxicity of MC-LR to mice by hydrolyzing MC-LR peptide bonds. The study demonstrates the potential of siderite, an earth-abundant and biocompatible mineral, for removing MC-LR from water.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000434892900038
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/42875]
专题	中国科学院化学研究所
通讯作者	Huang, Yingping; Ma, Wanhong
作者单位	1.China Three Gorges Univ, Coll Biol & Pharmaceut Sci, Yichang 443002, Peoples R China 2.Innovat Ctr Geohazards & Ecoenvironm Three Gorges, Yichang 443002, Hubei, Peoples R China 3.Univ Colorado, Dept Civil Environm & Architectural Engn, Boulder, CO 80309 USA 4.Chinese Acad Sci, Inst Chem, Key Lab Photochem, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Fang, Yanfen,Zhou, Wei,Tang, Changcun,et al. Bronsted Catalyzed Hydrolysis of Microcystin-LR by Siderite[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2018,52(11):6426-6437.
APA	Fang, Yanfen.,Zhou, Wei.,Tang, Changcun.,Huang, Yingping.,Johnson, David Mark.,...&Ma, Wanhong.(2018).Bronsted Catalyzed Hydrolysis of Microcystin-LR by Siderite.ENVIRONMENTAL SCIENCE & TECHNOLOGY,52(11),6426-6437.
MLA	Fang, Yanfen,et al."Bronsted Catalyzed Hydrolysis of Microcystin-LR by Siderite".ENVIRONMENTAL SCIENCE & TECHNOLOGY 52.11(2018):6426-6437.