Awanis Abdullah1, Ahmad Tariq Jameel2, Farah B Ahmad This email address is being protected from spambots. You need JavaScript enabled to view it.1,3, and Faridah Yusof1
1Department of Biotechnology Engineering, Kulliyyah of Engineering, International Islamic University Malaysia, 53100 Kuala Lumpur, Malaysia 2Department of Chemical Engineering, Aligarh Muslim University, 202001 Aligarh, India 3Department of Mechanical Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
Received: December 21, 2020 Accepted: January 4, 2022 Publication Date: August 12, 2022
Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.
As the most promising alternative to detect pesticides, enzyme-based electrochemical biosensors have gained considerable attention due to its operational simplicity and reliability. Alpha naphthyl acetate esterase (ANAE) enzyme, found in atta flour, can be used to detect pesticides. The crude ANAE enzyme was extracted from atta flour, filtered through a PTFE membrane and then purified using an aqueous two-phase separation system (ATPS). Polyethylene glycol (PEG) was used as it could enhance the catalytic activity and stability of enzyme in the ATPS. The ATPS, composed of PEG 1000/NaH2PO4 and PEG 1000, NaH2PO4/(NH4)2SO4, was performed at 4 °C and pH 5.0. The molecular weight of ANAE was assessed using sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). The molecular weight of the target esterase was found to be around 65 kilodaltons (kDa). The optimal condition of ANAE to catalyze alpha naphthyl acetate as substrate was at 40 °C with pH 8 of phosphate buffer and 15 min incubation time. The Michaelis-Menten parameters of the purified enzyme were 9.765 mM and 0.084 mM/min, respectively for Km and Vmax. This purified ANAE can be applied to fabricate of screen-printed electrode as biosensor for the detection of pesticides.
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