Thiol-stabilized luminescent CdTe quantum dot as biological fluorescent probe for sensitive detection of methyl parathion by a fluoroimmunochromatographic technique

Content Provider	CSIR - Central Food Technological Research Institute (CFTRI)
Author	Chouhan, R. S. Vinayaka, A. C. Thakur, M. S.
Abstract	Quantum dots (QDs) are preferred as highresolution biological fluorescent probes because of their inherent optical properties compared with organic dyes. This intrinsic property of QDs has been made use of for sensitive detection of methylparathion (MP) at picogramme levels. The specificity of the assay was attributed to highly specific immunological reactions. Competitive binding between free MP and CdTe QD bioconjugated MP (MP-BSA-CdTe) with immobilized anti-MP IgY antibodies was monitored in a flow-injection system. The fluorescence intensity of MPBSA- CdTe bioconjugate eluted from the column was found to be directly proportional to the free MP concentration. Hence, it was possible to detect MP in a linear range of 0.1– 1 ng mL−1 with a regression coefficient R2=0.9905. In this investigation, IgY proved advantageous over IgG class immunoglobulins in terms of yield, stability, cost effectiveness, and enhancement of assay sensitivity. The photoabsorption spectrum of bioconjugated CdTe QD (λmax= 310 nm) confirmed nano-biomolecular interactions. The results suggest the potential application of bioconjugation and nano-biomolecular interactions of QDs for biological labeling and target analyte detection with high sensitivity
File Format	PDF
Language	English
Access Restriction	Authorized
Subject Keyword	Chromatography Pesticide Chemistry
Content Type	Text
Resource Type	Article