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Wang G, Feng N, Zhao S, Song L, Zhang Y, Tong J, Liu Y, Kang X, Hu T, Ahmad Khan I, Lu K, Wu H, Xie J. Synthesis and DFT calculation of microbe-supported Pd nanocomposites with oxidase-like activity for sensitive detection of nitrite. Food Chem 2024; 434:137422. [PMID: 37703776 DOI: 10.1016/j.foodchem.2023.137422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Revised: 08/28/2023] [Accepted: 09/04/2023] [Indexed: 09/15/2023]
Abstract
Nanozymes have emerged as the forefront of research in analytical sensing due to their promising applications. In this study, we utilized polyethyleneimine (PEI)-modified Pichia pastoris residue to synthesize microbial-based palladium nanocomposites (Pd/MMR) through simple in-situ reduction methods. The dispersed active sites of Pd nanoparticles with a size of 2.12 ± 0.49 nm that were supported by microbial biomass provided excellent oxidative enzyme-mimicking activity to Pd/MMR. The catalytic mechanism of Pd/MMR involved the combined action of 1O2, ·OH, and ·O2-, and possible reaction pathways and corresponding energy barriers were also revealed using DFT calculations. We also established a quantitative detection platform for nitrite using Pd/MMR. The platform could detect nitrite at concentrations of 10-300 μM with a detection limit of 0.27 μM, and was successfully applied to detect nitrite in real samples. These findings serve as a reference for the synthesis and application of metal nanocomposites using microorganisms.
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Affiliation(s)
- Guozhen Wang
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
| | - Ningning Feng
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
| | - Shuguang Zhao
- Shenzhen Yonker Water Services Co., Ltd., Shenzhen 518000, China
| | - Leshan Song
- Shenzhen Yonker Water Services Co., Ltd., Shenzhen 518000, China
| | - Ying Zhang
- Shenzhen Yonker Water Services Co., Ltd., Shenzhen 518000, China
| | - Jiaxin Tong
- Powder Metallurgy Research Institute, Central South University, Changsha 410083, China
| | - Yuxing Liu
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
| | - Xinke Kang
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
| | - Tao Hu
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
| | - Iram Ahmad Khan
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
| | - Kuan Lu
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
| | - Haiyan Wu
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
| | - Jianping Xie
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.
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