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Liu S, Liu J, Wang Z, Wu Z, Wei Y, Liu P, Lan X, Liao Y, Lan P. In situ embedding of glucose oxidase in amorphous ZIF-7 with high catalytic activity and stability and mechanism investigation. Int J Biol Macromol 2023; 242:124806. [PMID: 37178879 DOI: 10.1016/j.ijbiomac.2023.124806] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2023] [Revised: 04/26/2023] [Accepted: 05/06/2023] [Indexed: 05/15/2023]
Abstract
Glucose oxidase (GOx) has a great application potential in the determination of glucose concentration. However, its sensitivity to the environment and poor recyclability limited its broader application. Herein, with the assistance of DA-PEG-DA, a novel immobilized GOx based on amorphous Zn-MOFs (DA-PEG-DA/GOx@aZIF-7/PDA) was developed to impart excellent properties to the enzyme. SEM, TEM, XRD, and BET analyses confirmed that GOx was embedded in amorphous ZIF-7 with ~5 wt% loading. Compared with free GOx, DA-PEG-DA/GOx@aZIF-7/PDA exhibited enhanced stability, excellent reusability, and promising potential for glucose detection. After 10 repetitions, the catalytic activity of DA-PEG-DA/GOx@aZIF-7/PDA can maintain 95.53 % ± 3.16 %. In understanding the in situ embedding of GOx in ZIF-7, the interaction of zinc ion and benzimidazole with GOx was studied by using molecular docking and multi-spectral methods. Results showed that zinc ions and benzimidazole had multiple binding sites on the enzyme, which induced the accelerated synthesis of ZIF-7 around the enzyme. During binding, the structure of the enzyme changes, but such changes hardly affect the activity of the enzyme. This study provides not only a preparation strategy of immobilized enzyme with high activity, high stability, and low enzyme leakage rate for glucose detection, but also a more comprehensive understanding of the formation of immobilized enzymes using the in situ embedding strategy.
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Affiliation(s)
- Siyuan Liu
- Guangxi Key Laboratory for Polysaccharide Materials and Modifications, Key Laboratory of New Technology for Chemical and Biological Transformation Process of Guangxi Higher Education Institutes, Guangxi Minzu University, Nanning, Guangxi 530006, PR China
| | - Jingxing Liu
- Guangxi Key Laboratory for Polysaccharide Materials and Modifications, Key Laboratory of New Technology for Chemical and Biological Transformation Process of Guangxi Higher Education Institutes, Guangxi Minzu University, Nanning, Guangxi 530006, PR China
| | - Zefen Wang
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi 530004, PR China; Institute of Biological Manufacturing Technology Co. Ltd, Guangxi Institute of Industrial Technology, Nanning, Guangxi 530002, PR China
| | - Zhiqi Wu
- Guangxi Key Laboratory for Polysaccharide Materials and Modifications, Key Laboratory of New Technology for Chemical and Biological Transformation Process of Guangxi Higher Education Institutes, Guangxi Minzu University, Nanning, Guangxi 530006, PR China
| | - Yiliang Wei
- Guangxi Key Laboratory for Polysaccharide Materials and Modifications, Key Laboratory of New Technology for Chemical and Biological Transformation Process of Guangxi Higher Education Institutes, Guangxi Minzu University, Nanning, Guangxi 530006, PR China
| | - Pengru Liu
- Guangxi Key Laboratory for Polysaccharide Materials and Modifications, Key Laboratory of New Technology for Chemical and Biological Transformation Process of Guangxi Higher Education Institutes, Guangxi Minzu University, Nanning, Guangxi 530006, PR China
| | - Xiongdiao Lan
- Guangxi Key Laboratory for Polysaccharide Materials and Modifications, Key Laboratory of New Technology for Chemical and Biological Transformation Process of Guangxi Higher Education Institutes, Guangxi Minzu University, Nanning, Guangxi 530006, PR China.
| | - Yexin Liao
- Guangxi Key Laboratory for Polysaccharide Materials and Modifications, Key Laboratory of New Technology for Chemical and Biological Transformation Process of Guangxi Higher Education Institutes, Guangxi Minzu University, Nanning, Guangxi 530006, PR China
| | - Ping Lan
- Guangxi Key Laboratory for Polysaccharide Materials and Modifications, Key Laboratory of New Technology for Chemical and Biological Transformation Process of Guangxi Higher Education Institutes, Guangxi Minzu University, Nanning, Guangxi 530006, PR China.
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Shortall K, Otero F, Bendl S, Soulimane T, Magner E. Enzyme Immobilization on Metal Organic Frameworks: the Effect of Buffer on the Stability of the Support. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:13382-13391. [PMID: 36286410 PMCID: PMC9648341 DOI: 10.1021/acs.langmuir.2c01630] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Revised: 09/28/2022] [Indexed: 05/04/2023]
Abstract
Metal organic frameworks (MOFs) have been used to encapsulate an array of enzymes in a rapid and facile manner; however, the stability of MOFs as supports for enzymes has not been examined in detail. This study examines the stability of MOFs with different compositions (Fe-BTC, Co-TMA, Ni-TMA, Cu-TMA, and ZIF-zni) in buffered solutions commonly used in enzyme immobilization and biocatalysis. Stability was assessed via quantification of the release of metals by inductively coupled plasma optical emission spectroscopy. The buffers used had varied effects on different MOF supports, with incubation of all MOFs in buffers resulting in the release of metal ions to varying extents. Fe-BTC was completely dissolved in citrate, a buffer that has a profound destabilizing effect on all MOFs analyzed, precluding its use with MOFs. MOFs were more stable in acetate, potassium phosphate, and Tris HCl buffers. The results obtained provide a guide for the selection of an appropriate buffer with a particular MOF as a support for the immobilization of an enzyme. In addition, these results identify the requirement to develop methods of improving the stability of MOFs in aqueous solutions. The use of polymer coatings was evaluated with polyacrylic acid (PAA) providing an improved level of stability. Lipase was immobilized in Fe-BTC with PAA coating, resulting in a stable biocatalyst with retention of activity in comparison to the free enzyme.
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Affiliation(s)
- Kim Shortall
- Department of Chemical Sciences, Bernal
Institute, University of Limerick, V94 T9PX Limerick, Ireland
| | - Fernando Otero
- Department of Chemical Sciences, Bernal
Institute, University of Limerick, V94 T9PX Limerick, Ireland
| | - Simon Bendl
- Department of Chemical Sciences, Bernal
Institute, University of Limerick, V94 T9PX Limerick, Ireland
| | - Tewfik Soulimane
- Department of Chemical Sciences, Bernal
Institute, University of Limerick, V94 T9PX Limerick, Ireland
| | - Edmond Magner
- Department of Chemical Sciences, Bernal
Institute, University of Limerick, V94 T9PX Limerick, Ireland
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Auer B, Telfer S, GROSS A. Metal Organic Frameworks for Bioelectrochemical Applications. ELECTROANAL 2022. [DOI: 10.1002/elan.202200145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Abstract
Bioelectrocatalysis using redox enzymes appears as a sustainable way for biosensing, electricity production, or biosynthesis of fine products. Despite advances in the knowledge of parameters that drive the efficiency of enzymatic electrocatalysis, the weak stability of bioelectrodes prevents large scale development of bioelectrocatalysis. In this review, starting from the understanding of the parameters that drive protein instability, we will discuss the main strategies available to improve all enzyme stability, including use of chemicals, protein engineering and immobilization. Considering in a second step the additional requirements for use of redox enzymes, we will evaluate how far these general strategies can be applied to bioelectrocatalysis.
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