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Studies Conducted at Jilin University on Pesticides Recently Reported

June 24, 2014

By a News Reporter-Staff News Editor at Physics Week -- Fresh data on Pesticides are presented in a new report. According to news originating from Changchun, People's Republic of China, by VerticalNews correspondents, research stated, "A sensitive fluorescence detection method of organophosphate pesticides (OPs) represented by methamidophos was developed using the inner filter effect (IFE) of Au nanoparticles (AuNPs) on CdTe quantum dots (QDs). The fluorescence of CdTe QDs was remarkably quenched with the presence of AuNPs via IFE."

Our news journalists obtained a quote from the research from Jilin University, "Acetylcholinesterase (AChE) catalyzed the hydrolysis of acetylthiocholine into thiocholine, which could induce the aggregation of AuNPs and decrease their characteristic absorption, making IFE-decreased fluorescence of CdTe QDs recovered. OPs can inhibit the activity of AChE, thus preventing the aggregation of AuNPs and the fluorescence recovery of CdTe QDs. Therefore, the IFE of fluorescence between AuNPs and CdTe QDs could convert the absorption signal to fluorescence signal, which improved the detection sensitivity of OPs in vegetables. Under the optimum conditions, the response was linearly proportional to the concentration of methamidophos in the range of 0.06 similar to 0.78 mg/kg with a detection limit of 2 mu g/kg (3 sigma) which was superior to the method of GB/T 5009.199-2003."

According to the news editors, the research concluded: "The proposed assay exhibited good reproducibility and accuracy, providing a simple and rapid method for the screening of OPs."

For more information on this research see: Highly Sensitive Detection of Organophosphorus Pesticides Represented by Methamidophos via Inner Filter Effect of Au Nanoparticles on the Fluorescence of CdTe Quantum Dots. Food Analytical Methods, 2014;7(6):1247-1255. Food Analytical Methods can be contacted at: Springer, 233 Spring St, New York, NY 10013, USA. (Springer -; Food Analytical Methods -

The news correspondents report that additional information may be obtained from J.J. Guo, Jilin University, Dept. of Food Qual & Safety, Changchun 130062, People's Republic of China. Additional authors for this research include H.K. Li, M. Xue, M.W. Zhang, X.Y. Cao, Y.L. Luo, F. Shen and C.Y. Sun.

Keywords for this news article include: Asia, Changchun, Pesticides, Nanoparticle, Quantum Dots, Agrochemicals, Nanotechnology, Quantum Physics, Emerging Technologies, People's Republic of China

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Source: Physics Week

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