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MPH-GST sensing microplate for easy detection of organophosphate insecticides

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Abstract

Objective

To develop a convenient and efficient means for organophosphate (OP) insecticide detection, a simple, cost-effective, and easy-to-use absorbance-based sensing device was generated using methyl parathion hydrolase fused with glutathione-S-transferase (MPH-GST) covalently immobilized onto a chitosan film-coated microplate.

Results

With methyl parathion (MP) as a representative substrate, this MPH-GST sensing microplate had the detection limit of 0.1 µM and the linear range of 0.1–50 µM. Despite its highest stability at 4 °C, it was considerably stable at 25 °C with high activity for 30 days. It was also most stable at pH 8.0 and could be efficiently reused up to 100 rounds. The device revealed a high percentage of recovery for tap water spiked with a known concentration of MP, which was also comparable to the result obtained from gas chromatography-mass spectrometry. It also showed a high recovery of 82–100% with MP spiked agricultural products and satisfactory results with non-spiked samples. This immobilized enzyme sensing system was more sensitive and efficient than the whole cell system from our previous work.

Conclusions

All of the advantages of the MPH-GST sensing microplate developed have rendered it suitable for rapid and convenient OP screening, and for being a bio-element for fabricating a potential optical biosensor in the future.

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Abbreviations

OP:

Organophosphate insecticide

MP:

Methyl parathion

AChE:

Acetylcholinesterase

MPH:

Methyl parathion hydroloase

MPH-GST:

Methyl parathion hydrolase fused with glutathione-S-transferase

GC–MS:

Gas chromatography–mass spectrometry

LOD:

Limit of detection

NTA:

Nitrilotriacetic acid

References

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Acknowledgements

We thank the Department of Biotechnology, Faculty of Engineering and Industrial Technology, Silpakorn University and the Division of Science and Technology, Faculty of Science and Technology, Phetchaburi Rajabhat University for providing facilities and equipment necessary for this research. We also thank Miss Tipaporn Subsomboon for her helpful technical support and Ms. Jongkonrat Wichitwechkarn for proofreading and editing the manuscript.

Funding

This research was funded by Research and Researcher for Industry (RRI) grant, Thailand Research Fund, Contract No. PHD59I0024. Mixberry Co., Ltd. joined in part in the RRI funding program. The research work was also financially supported by the Research Network for Higher Education in Lower Central Region of Thailand through Silpakorn University Research, Innovation and Creativity Administration Office, a part of which was jointly funded by A4 Fruit Trading Co., Ltd.

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Authors and Affiliations

Authors

Contributions

Conceptualization: WR and JW; Methodology: WR, SC, JM, and JW; Formal analysis and investigation: WR; Writing—original draft preparation: WR; Writing—review and editing: WR, SC, and JW; Funding acquisition: JW; Project administration: JW; Supervision: JW and JM.

Corresponding author

Correspondence to Jesdawan Wichitwechkarn.

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The authors declare that they have no conflict of interest.

Research using human and animal consents

This article does not contain any studies with human participants or animals performed by any of the authors.

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Rapichai, W., Chaichalerm, S., Mearnchu, J. et al. MPH-GST sensing microplate for easy detection of organophosphate insecticides. Biotechnol Lett 43, 933–944 (2021). https://doi.org/10.1007/s10529-021-03078-1

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  • DOI: https://doi.org/10.1007/s10529-021-03078-1

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