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Issue 10, 2017
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An electrochemical algal biosensor based on silica coated ZnO quantum dots for selective determination of acephate

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Abstract

An electrochemical biosensor for the determination of the acephate pesticide was developed based on algal modified silica coated ZnO quantum dots (QDs). The surface active alkaline phosphatase enzyme on the Chlorella sp. algal cell wall dephosphorylates substrate p-nitrophenyl phosphate (pNPP) and release p-nitrophenol (pNP), which being electroactive gets oxidized on the modified working electrode to generate current equivalent to the amount of pNP released from the substrate. The presence of acephate would inhibit the formation of pNP and hence decrease in current, which indirectly corresponds to the concentration of the pesticide present. The biosensor responds linearly in the concentration range of 10−11 M to 10−3 M for acephate and showed that QDs strongly influenced the biosensor performance as they increased sensitivity and improved the detection limit.

Graphical abstract: An electrochemical algal biosensor based on silica coated ZnO quantum dots for selective determination of acephate

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Publication details

The article was received on 12 Jan 2017, accepted on 13 Feb 2017 and first published on 14 Feb 2017


Article type: Paper
DOI: 10.1039/C7AY00111H
Citation: Anal. Methods, 2017,9, 1672-1680
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    An electrochemical algal biosensor based on silica coated ZnO quantum dots for selective determination of acephate

    M. Pabbi and S. K. Mittal, Anal. Methods, 2017, 9, 1672
    DOI: 10.1039/C7AY00111H

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