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Liu C, Tan L, Zhang K, Wang W, Ma L. Immobilization of Horseradish Peroxidase for Phenol Degradation. ACS OMEGA 2023; 8:26906-26915. [PMID: 37546652 PMCID: PMC10398862 DOI: 10.1021/acsomega.3c01570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Accepted: 07/05/2023] [Indexed: 08/08/2023]
Abstract
The use of enzymes to degrade environmental pollutants has received wide attention as an emerging green approach. Horseradish peroxidase (HRP) can efficiently catalyze the degradation of phenol in the environment; however, free HRP exhibits poor stability and temperature sensitivity and is easily deactivated, which limit its practical applications. In this study, to improve their thermal stability, HRP enzymes were immobilized on mesoporous molecular sieves (Al-MCM-41). Specifically, Al-MCM-41(W) and Al-MCM-41(H) were prepared by modifying the mesoporous molecular sieve Al-MCM-41 with glutaraldehyde and epichlorohydrin, respectively, and used as carriers to immobilize HRP on their surface, by covalent linkage, to form the immobilized enzymes HRP@Al-MCM-41(W) and HRP@Al-MCM-41(H). Notably, the maximum reaction rate of HRP@Al-MCM-41(H) was increased from 2.886 × 105 (free enzyme) to 5.896 × 105 U/min-1, and its half-life at 50 °C was increased from 745.17 to 1968.02 min; the thermal stability of the immobilized enzyme was also significantly improved. In addition, we elucidated the mechanism of phenol degradation by HRP, which provides a basis for the application of this enzyme to phenol degradation.
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Affiliation(s)
- Can Liu
- Key
Laboratory for Northern Urban Agriculture of Ministry of Agriculture
and Rural Affairs, Beijing University of
Agriculture, Beinong Road 7, Huilongguan, Changping District, Beijing 102206, PR China
| | - Li Tan
- Key
Laboratory for Northern Urban Agriculture of Ministry of Agriculture
and Rural Affairs, Beijing University of
Agriculture, Beinong Road 7, Huilongguan, Changping District, Beijing 102206, PR China
| | - Kaixin Zhang
- Key
Laboratory for Northern Urban Agriculture of Ministry of Agriculture
and Rural Affairs, Beijing University of
Agriculture, Beinong Road 7, Huilongguan, Changping District, Beijing 102206, PR China
| | - Wenyi Wang
- Key
Laboratory for Northern Urban Agriculture of Ministry of Agriculture
and Rural Affairs, Beijing University of
Agriculture, Beinong Road 7, Huilongguan, Changping District, Beijing 102206, PR China
| | - Lanqing Ma
- Key
Laboratory for Northern Urban Agriculture of Ministry of Agriculture
and Rural Affairs, Beijing University of
Agriculture, Beinong Road 7, Huilongguan, Changping District, Beijing 102206, PR China
- Beijing
Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing University of Agriculture, Beinong Road 7, Huilongguan, Changping
District, Beijing 102206, PR China
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Pei R, Ye L, Jing C. Enzyme-based electrochemical biosensor for antimonite detection in water. Biosens Bioelectron 2023; 229:115244. [PMID: 36966618 DOI: 10.1016/j.bios.2023.115244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Revised: 03/17/2023] [Accepted: 03/19/2023] [Indexed: 03/31/2023]
Abstract
Antimonite (SbIII) is a naturally occurring contaminant demanding on-site ultrasensitive detection. The enzyme-based electrochemical (EC) biosensors are promising, but the lack of specific SbIII oxidizing enzymes hindered the past efforts. Herein, we modulated the specificity of arsenite oxidase AioAB toward SbIII by regulating its spatial conformation from tight to loose using the metal-organic framework ZIF-8. The constructed EC biosensor, AioAB@ZIF-8, exhibited the substrate specificity toward SbIII at 12.8 s-1 μM-1, an order of magnitude higher than that of AsIII (1.1 s-1 μM-1). Relaxing AioAB structure in ZIF-8 was evidenced by the break of the S-S bond and the conversion of α helix to the random coil as suggested by Raman spectroscopy. Our AioAB@ZIF-8 EC sensor exhibited a dynamic linear range in 0.041-4.1 μM at a response time of 5 s, and the detection limit at 0.041 μM at a high sensitivity of 1894 nA μM-1. The insights into tuning the specificity of an enzyme shed new light on biosensing metal(loid)s without specific proteins.
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Wan T, Li K, Kong X, Shen Q, Sun F, Wu H. A new Ag(I) inorganic polymer consisting of Ag(I)-Ag(I) bonds for electrochemical sensing of H 2O 2. J COORD CHEM 2022. [DOI: 10.1080/00958972.2022.2103805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Affiliation(s)
- Tiantian Wan
- School of Chemistry and Chemical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, P. R. China
| | - Kaiyi Li
- School of Chemistry and Chemical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, P. R. China
| | - Xiaoxia Kong
- School of Chemistry and Chemical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, P. R. China
| | - Qinqin Shen
- School of Chemistry and Chemical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, P. R. China
| | - Fugang Sun
- School of Chemistry and Chemical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, P. R. China
| | - Huilu Wu
- School of Chemistry and Chemical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, P. R. China
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