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题名: Spectrophotometric determination of mercury(II) ions based on their stimulation effect on the peroxidase-like activity of molybdenum disulfide nanosheets
作者: Lu, Y; Yu, J; Ye, WC(叶为春); Yao, X; Zhou, PP(周盼盼); Zhang, HX(张海霞); Zhao, SQ; Jia, LP
收录类别: SCIE
出版日期: 2016-08
刊名: MICROCHIMICA ACTA
卷号: 183, 期号:8, 页码:2481-2489
出版者: SPRINGER
出版地: WIEN
英文摘要: The authors describe a colorimetric method for the determination of Hg(II) ions by exploiting the peroxidase-lile activity of few-layered MoS2 nanosheets (MoS2-NSs). These were prepared by sonication-induced exfoliation of bulk MoS2 crystals in aqueous surfactant solution. The MoS2-NSs were found to acts as a peroxidase mimic that is capable of oxidizing the substrate 3,3',5,5'-tetramethylbenzidine (TMB) in the presence of hydrogen peroxide (H2O2) to give a blue product with an absorption maximum at 652 nm. The addition of Hg(II) strongly accelerates the kinetics of this reaction. It is shown that the enzyme mimic possesses a high affinity for TMB and a lower pseudo-Michaelis-Menten constant. The stimulating effect of Hg(II) is seriously influenced by the change of surface charge. The use of nanosheets covered with (negatively charged) polystyrene sulfonate results in a decrease in the formation of blue dye, while those covered with (cationic) poly(diallyldimethyl ammonium) ions cause a small increase. Under optimal conditions, the peroxidase-like activity of MoS2-NSs is affected by Hg(II) in the 2.0 to 200 mu M concentration range. The method has a detection limit (LOD) of 0.5 mu M which is much below the allowed level in cosmetics (1 ppm; ca. 5 mu M). The method display excellent sensitivity, selectivity and stability. It was applied to the determination of total mercury in cosmetic samples, and results compared well with results obtained by ICP-AES.
关键词: Peroxidase mimic ; Spectrophotometric assay ; Molybdenum disulfide nanosheets ; Surface charge effect ; Mercury(II) detection
作者部门: [Lu, Yuan ; Yu, Jing ; Ye, Weichun ; Yao, Xin ; Zhou, Panpan ; Zhang, Haixia ; Jia, Lipei] Lanzhou Univ, Dept Chem, Lanzhou 730000, Peoples R China ; [Lu, Yuan ; Yu, Jing ; Ye, Weichun ; Yao, Xin ; Zhou, Panpan ; Zhang, Haixia ; Jia, Lipei] Lanzhou Univ, State Key Lab Appl Organ Chem, Lanzhou 730000, Peoples R China ; [Zhao, Suqin] Qinhai Univ Nationalities, Coll Phys & Elect Informat Engn, Xining 810007, Peoples R China
通讯作者: Ye, WC ; Zhang, HX (reprint author), Lanzhou Univ, Dept Chem, Lanzhou 730000, Peoples R China. ; Ye, WC ; Zhang, HX (reprint author), Lanzhou Univ, State Key Lab Appl Organ Chem, Lanzhou 730000, Peoples R China.
学科分类: Chemistry
文章类型: Article
所属项目编号: Post-Doctoral Science Foundation of China [2013M542393] ; Fundamental Research Fund for the Central Universities [lzujbky-2014-69] ; Applied Basic Research Project of Qinghai Province [2015-ZJ-783]
所属项目名称: 中国博士后科学基金 ; 中央高校基本科研业务费专项资金
项目资助者: CPSF ; LZU
语种: 英语
DOI: 10.1007/s00604-016-1886-4
ISSN号: 0026-3672
WOS记录号: WOS:000379699900015
IR记录号: WOS:000379699900015
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内容类型: 期刊论文
URI标识: http://ir.lzu.edu.cn/handle/262010/180521
Appears in Collections:化学化工学院_期刊论文

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Recommended Citation:
Lu, Y,Yu, J,Ye, WC,et al. Spectrophotometric determination of mercury(II) ions based on their stimulation effect on the peroxidase-like activity of molybdenum disulfide nanosheets[J]. MICROCHIMICA ACTA,2016,183(8):2481-2489.
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