Abstract：
:A novel and sensitive fluorescence probe based on near-infrared CuInS2 quantum dots (QDs) for parathion-methyl (PM) detection was developed. Water-soluble CuInS2 QDs were directly synthesised in aqueous solution with mercaptopropionic acid as stabilizers. The fluorescence intensity of CuInS2 QDs was quenched in the presence of Pb(2+) due to the competitive binding of Pb(2+) and mercaptopropionic acid with QDs. PM could be hydrolysed by organophosphorus hydrolase to form di-methylthiophosphoricacid. Subsequently, di-methylthiophosphoricacid moiety with a PS bond could capture Pb(2+) on the surface of the CuInS2 QDs, which would lead the fluorescence of the CuInS2 QDs-Pb(2+) system recovery. The fluorescence intensity of the CuInS2 QD-Pb(2+) system was proportional to the PM concentration in the range of 0.10-38.00 μmol/L, with a detection limit of 0.06 μmol/L. The proposed method had been used for PM detection in environmental and agricultural samples with satisfactory results.
journal_name
Food Chemjournal_title
Food chemistryauthors
Yan X,Li H,Yan Y,Su Xdoi
10.1016/j.foodchem.2014.09.152subject
Has Abstractpub_date
2015-04-15 00:00:00pages
179-84eissn
0308-8146issn
1873-7072pii
S0308-8146(14)01541-6journal_volume
173pub_type
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