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Pang X, Chen Y, Gao R, Sun Y, Qiao X, Xu Z. Single-atom Zr-doped CoOOH with enhanced electrical conductivity as a signal amplifier and detection probe for the indirect non-enzymatic electrochemical determination of malathion in foods. Food Chem 2024; 460:140563. [PMID: 39053269 DOI: 10.1016/j.foodchem.2024.140563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2024] [Revised: 07/17/2024] [Accepted: 07/20/2024] [Indexed: 07/27/2024]
Abstract
Herein, a novel electrochemical sensor based on zirconium-doped cobalt oxyhydroxide (ZrCoOOH) was proposed for highly sensitive non-enzymatic determination of malathion (MAL). The doping of Zr can improve the electrical conductivity of CoOOH, of which the transfer resistance was reduced from 241.1 Ω to 140.2 Ω. Furthermore, the X-ray photoelectron spectroscopy confirmed that part of Co2+ was converted to Co3+ due to the introduction of Zr. The Co3+ in ZrCoOOH could react with MAL to form Co2+, which enhanced the electrooxidation current of Co2+. Therefore, the peak current of Co2+ was served as detection probe for MAL. Under optimal conditions, the developed sensor established the linear relationship for MAL in the concentration range of 0.001-10.0 μM with a low limit of detection (0.64 nM). The constructed sensor was employed to detect MAL in food samples (peach, kiwi fruit, spinach and tomato), verifying the accuracy and practicability of the sensor.
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Affiliation(s)
- Xiaomin Pang
- College of Food Science and Engineering, Shandong Agricultural University, Tai'an 271018, People's Republic of China
| | - Yongfeng Chen
- College of Food Science and Engineering, Shandong Agricultural University, Tai'an 271018, People's Republic of China
| | - Rui Gao
- College of Food Science and Engineering, Shandong Agricultural University, Tai'an 271018, People's Republic of China
| | - Yufeng Sun
- College of Food Science and Engineering, Shandong Agricultural University, Tai'an 271018, People's Republic of China
| | - Xuguang Qiao
- College of Food Science and Engineering, Shandong Agricultural University, Tai'an 271018, People's Republic of China
| | - Zhixiang Xu
- College of Food Science and Engineering, Shandong Agricultural University, Tai'an 271018, People's Republic of China.
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2
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Tan R, Zeng M, Huang Q, Zhou N, Deng M, Li Y, Luo X. Dual-mode SERS/colorimetric sensing of nitrite in meat products based on multifunctional au NPs@COF composite. Food Chem 2024; 457:140166. [PMID: 38936123 DOI: 10.1016/j.foodchem.2024.140166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Revised: 06/17/2024] [Accepted: 06/18/2024] [Indexed: 06/29/2024]
Abstract
The presence of nitrite in food products has generated significant public concern. A simple and rapid dual-mode surface-enhanced Raman spectroscopy (SERS)/colorimetric detection of nitrite is proposed based on a diazo reaction and multifunctional gold nanoparticle-doped covalent organic framework (Au@COF) composite. Under acidic conditions, the reaction between toluidine blue and nitrite yielded a colorless diazo salt, simultaneously attenuating its characteristic absorption peak and Raman signal. The multifunctional Au@COF materials enhanced the Raman signal and ensured good reproducibility. Additionally, the reaction rates improved, and the sensitivity was enhanced due to the excellent adsorption capacity of the COF. The proposed method demonstrated high sensitivity and excellent recovery rates for nitrite detection in food samples. This approach shows potential for precisely detecting nitrite content in real-world food samples by integrating the simplicity of colorimetric analysis with the enhanced sensitivity of SERS.
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Affiliation(s)
- Rui Tan
- School of Science, Xihua University, Chengdu 610039, PR China
| | - Mei Zeng
- School of Science, Xihua University, Chengdu 610039, PR China
| | - Qiuwen Huang
- School of Science, Xihua University, Chengdu 610039, PR China
| | - Na Zhou
- School of Science, Xihua University, Chengdu 610039, PR China
| | - Mengjiang Deng
- School of Science, Xihua University, Chengdu 610039, PR China
| | - Yuanyuan Li
- Shanghai Anti-doping Laboratory, Shanghai University of Sport, Shanghai 200,438, PR China..
| | - Xiaojun Luo
- School of Science, Xihua University, Chengdu 610039, PR China; Asymmetric Synthesis and Chiral technology Key Laboratory of Sichuan Province, Chengdu 610,039, PR China..
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3
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Fan Y, Fu L, Su H, Tang L, Wu Q, Jia L. Membrane separation assisted colorimetric/fluorescent detection of β-galactosidase-positive bacteria in milk and milk powder based on the oxidase-like activity of CoOOH nanosheets. Food Chem 2024; 461:140946. [PMID: 39191035 DOI: 10.1016/j.foodchem.2024.140946] [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: 05/16/2024] [Revised: 08/19/2024] [Accepted: 08/20/2024] [Indexed: 08/29/2024]
Abstract
Species-specific enzymes provide a substantial boost to the precision and selectivity of identifying dairy products contaminated with foodborne pathogens, due to their specificity for target organisms. In this study, we developed cobalt oxyhydroxide nanosheets (CoOOH NSs) for a dual-mode biosensor capable of detecting β-galactosidase (β-Gal)-positive bacteria in milk and milk powder. The sensor exploits the oxidase-mimicking activity of CoOOH NSs, where β-Gal converts the substrate β-D-galactopyranoside to p-aminophenol, reducing CoOOH NSs to Co2+ and inhibiting the formation of the blue product from 3,3',5,5'-tetramethylben-zidine. Sensitivity was enhanced through membrane filtration and β-Gal induction by isopropyl β-D-thiogalactoside. The assay achieved a detection limit of 5 cfu mL-1 and demonstrated recoveries (90.7 % to 103 %) and relative standard deviations <5.7 % in milk and milk powder samples. These findings underscore the potential of the sensor for detecting β-Gal-positive bacteria in dairy products.
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Affiliation(s)
- Yi Fan
- Ministry of Education Key Laboratory of Laser Life Science & Guangdong Provincial Key Laboratory of Laser Life Science & Guangzhou Key Laboratory of Spectral Analysis and Functional Probes, College of Biophotonics, South China Normal University, Guangzhou 510631, China
| | - Li Fu
- Ministry of Education Key Laboratory of Laser Life Science & Guangdong Provincial Key Laboratory of Laser Life Science & Guangzhou Key Laboratory of Spectral Analysis and Functional Probes, College of Biophotonics, South China Normal University, Guangzhou 510631, China
| | - Huihui Su
- Ministry of Education Key Laboratory of Laser Life Science & Guangdong Provincial Key Laboratory of Laser Life Science & Guangzhou Key Laboratory of Spectral Analysis and Functional Probes, College of Biophotonics, South China Normal University, Guangzhou 510631, China
| | - Li Tang
- Ministry of Education Key Laboratory of Laser Life Science & Guangdong Provincial Key Laboratory of Laser Life Science & Guangzhou Key Laboratory of Spectral Analysis and Functional Probes, College of Biophotonics, South China Normal University, Guangzhou 510631, China
| | - Qingxi Wu
- Ministry of Education Key Laboratory of Laser Life Science & Guangdong Provincial Key Laboratory of Laser Life Science & Guangzhou Key Laboratory of Spectral Analysis and Functional Probes, College of Biophotonics, South China Normal University, Guangzhou 510631, China
| | - Li Jia
- Ministry of Education Key Laboratory of Laser Life Science & Guangdong Provincial Key Laboratory of Laser Life Science & Guangzhou Key Laboratory of Spectral Analysis and Functional Probes, College of Biophotonics, South China Normal University, Guangzhou 510631, China.
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4
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Liang M, Gao Y, Sun X, Kong RM, Xia L, Qu F. Metal-organic framework-based ratiometric point-of-care testing for quantitative visual detection of nitrite. JOURNAL OF HAZARDOUS MATERIALS 2024; 469:134021. [PMID: 38490146 DOI: 10.1016/j.jhazmat.2024.134021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Revised: 03/03/2024] [Accepted: 03/11/2024] [Indexed: 03/17/2024]
Abstract
Nitrite (NO2-) is categorized as a carcinogenic substance and is subjected to severe limitations in water and food. To safeguard the public's health, developing fast and convenient methods for determination of NO2- is of significance. Point-of-care testing (POCT) affords demotic measurement of NO2- and shows huge potential in future technology beyond those possible with traditional methods. Here, a novel ratiometric fluorescent nanoprobe (Ru@MOF-NH2) is developed by integrating UiO-66-NH2 with tris(2,2'-bipyridyl)ruthenium(II) ([Ru(bpy)3]2+) through a one-pot approach. The special diazo-reaction between the amino group of UiO-66-NH2 and NO2- is responsible for the report signal (blue emission) with high selectivity and the red emission from [Ru(bpy)3]2+ offers the reference signal. The proposed probe shows obviously distinguishable color change from blue to red towards NO2- via naked-eye. Moreover, using a smartphone as the detection device to read color hue, ultra-sensitive quantitative detection of NO2- is achieved with a low limit of detection at 0.6 μΜ. The accuracy and repeatability determined in spiked samples through quantitative visualization is in the range of 105 to 117% with a coefficient of variation below 4.3%. This POCT sensing platform presents a promising strategy for detecting NO2- and expands the potential applications for on-site monitoring in food and environment safety assessment.
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Affiliation(s)
- Maosheng Liang
- Chemistry and Chemical Engineering College, Qufu Normal University, Qufu, Shandong 273165, PR China
| | - Yifan Gao
- Chemistry and Chemical Engineering College, Qufu Normal University, Qufu, Shandong 273165, PR China
| | - Xiaoling Sun
- Chemistry and Chemical Engineering College, Qufu Normal University, Qufu, Shandong 273165, PR China
| | - Rong-Mei Kong
- Chemistry and Chemical Engineering College, Qufu Normal University, Qufu, Shandong 273165, PR China
| | - Lian Xia
- Chemistry and Chemical Engineering College, Qufu Normal University, Qufu, Shandong 273165, PR China.
| | - Fengli Qu
- Chemistry and Chemical Engineering College, Qufu Normal University, Qufu, Shandong 273165, PR China
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Liu L, Liu G, Mu X, Zhao S, Tian J. Simple enzyme-free detection of uric acid by an in situ fluorescence and colorimetric method based on Co-PBA with high oxidase activity. Analyst 2024; 149:1455-1463. [PMID: 38190248 DOI: 10.1039/d3an01985c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2024]
Abstract
In this work, we prepared a simple and low-cost cobalt-doped Prussian blue analog (Co-PBA), which can directly oxidize 10-acetyl-3,7-dihydroxyphenoxazine and 3,3',5,5'-tetramethylbenzidine (TMB) to produce resorufin (ox-AR) with high fluorescent quantum yield and ox-TMB with blue color, respectively, without the need for unstable H2O2. Using the Michaelis-Menten curve and Lineweaver-Burk equation, the Michaelis-Menten constant of Co-PBA and the substrate TMB was found to be 0.033 mM, which was much lower than horseradish peroxidase and other reported nanozymes, showing satisfactory substrate affinity. Uric acid (UA) can cause erosion of the Co-PBA structure, and it significantly reduces the catalytic activity of Co-PBA, resulting in the decrease of the fluorescence emission signal of ox-AR and the absorption signal of ox-TMB. Based on this, a simple, sensitive, and fast fluorescence/colorimetric dual-mode uric acid detection platform was established. The detection range for UA by fluorescence method is 0.625-40 μM, and the detection limit (LOD, S/N = 3) is as low as 0.389 μM. The detection system was applied to serum samples with good recovery and can be used for field detection of UA in biological samples under different environments to meet different needs.
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Affiliation(s)
- Lu Liu
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, China.
| | - Guang Liu
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, China.
| | - Xiaomei Mu
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, China.
| | - Shulin Zhao
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, China.
| | - Jianniao Tian
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, China.
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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] [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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7
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Peng Z, Liao Z, Liu S, Lian T, Xu P, Qiu P. Ratiometric colorimetric detection of nitrite using CoMnO 3 nanofibers as an oxidase-like enzyme to induce diazotization reaction. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2023; 15:5341-5350. [PMID: 37794784 DOI: 10.1039/d3ay01290e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/06/2023]
Abstract
Nitrite is a typical food additive and preservative used in the food industry, which has attracted considerable attention due to its severe adverse effects on human health. Herein, a sensitive and highly selective ratiometric colorimetric sensing platform for the detection of nitrite was created based on a polymetallic oxide nanozyme, CoMnO3 nanofibers (CMO) catalysis integrated with the particular diazotization reaction. The nanozyme has superior oxidase-like activity (Km was 0.105 mM and Vmax was 63.7 × 10-8 M S-1) and could catalyze the oxidation of 3,3',5,5'-tetramethylbenzidine (TMB) to oxidized TMB (oxTMB), as CMO could achieve the conversion of oxygen in the solution to superoxide anion (O2˙-). In addition, it is interesting to note that oxTMB can be diazotized in the presence of nitrite under acidic conditions, causing a shift in the ratio of nitrite concentration to the absorbance peaks at 450 and 652 nm (A450/A652). The ratio of A450/A652 exhibited a positive linear relationship with the concentration of nitrite within the concentration range of 0.2-200 μM, with a detection limit of 0.094 μM. Simultaneously, this method was also successful in quantifying the nitrite produced by brined and pickled foods and the dynamic tracking of the nitrite levels in various types of dishes. The analysis method not only offers dual-signal ratio sensing with high sensitivity but also holds the benefit of outstanding selectivity for the use of the particular reaction, which has a wide range of application prospects in food safety management.
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Affiliation(s)
- Zoujun Peng
- Department of Chemistry, Nanchang University, Nanchang 330031, China.
- Institute for Advanced Study, Nanchang University, Nanchang 330031, China
| | - Ziwen Liao
- Department of Chemistry, Nanchang University, Nanchang 330031, China.
- College of Food Science and Technology, Nanchang University, Nanchang 330031, China
| | - Sipei Liu
- Department of Chemistry, Nanchang University, Nanchang 330031, China.
- Institute for Advanced Study, Nanchang University, Nanchang 330031, China
| | - Tao Lian
- Department of Chemistry, Nanchang University, Nanchang 330031, China.
| | - Peng Xu
- Center of Analysis and Testing, Nanchang University, Nanchang 330031, China.
| | - Ping Qiu
- Department of Chemistry, Nanchang University, Nanchang 330031, China.
- Jiangxi Province Key Laboratory of Modern Analytical Science, Nanchang University, Nanchang 330031, China
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Lin D, Wu S, Chu S, Lu Y. Cobalt-Nitrogen Co-Doped Carbon as Highly Efficient Oxidase Mimics for Colorimetric Assay of Nitrite. BIOSENSORS 2023; 13:748. [PMID: 37504147 PMCID: PMC10377546 DOI: 10.3390/bios13070748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 06/27/2023] [Accepted: 07/18/2023] [Indexed: 07/29/2023]
Abstract
Transition metal-N-doped carbon has been demonstrated to mimic natural enzyme activity; in this study, cobalt-nitrogen co-doped carbon (Co-N-C) nanomaterial was developed, and it could be an oxidase mimic. Firstly, Co-N-C with oxidase-like activity boosts the chromogenic reaction of 3,3',5,5'-tetramethylbenzidine (TMB) to produce the oxidized TMB (oxTMB). And the aromatic primary amino group of oxTMB reacts with nitrite (NO2-) to form diazo groups. Based on this background, we developed a cascade system of a Co-N-C-catalyzed oxidation reaction and a diazotization reaction for nitrite determination. The low detection limit (0.039 μM) indicates that Co-N-C is superior compared with the vast majority of previously reported nitrite assays. This study not only provides a novel nanozyme with sufficiently dispersed active sites, but it also further applies it to the determination of nitrite, which is expected to expand the application of nanozymes in colorimetric analysis.
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Affiliation(s)
- Dalei Lin
- School of Materials Science and Engineering, University of Jinan, Jinan 250022, China
| | - Shuzhi Wu
- Shandong Academy of Preventive Medicine, Shandong Center for Disease Control and Prevention, Jinan 250014, China
| | - Shushu Chu
- School of Materials Science and Engineering, University of Jinan, Jinan 250022, China
| | - Yizhong Lu
- School of Materials Science and Engineering, University of Jinan, Jinan 250022, China
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