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Shi X, Li H, Yao S, Ding Y, Lin X, Xu H, Liu Y, Zhao C, Zhang T, Wang J. A CRISPR/Cas12a-assisted bacteria quantification platform combined with magnetic covalent organic frameworks and hybridization chain reaction. Food Chem 2024; 440:138196. [PMID: 38104450 DOI: 10.1016/j.foodchem.2023.138196] [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: 07/10/2023] [Revised: 12/05/2023] [Accepted: 12/10/2023] [Indexed: 12/19/2023]
Abstract
The total bacterial count is an important indicator of food contamination in food safety supervision and management. Recently, the CRISPR/Cas12a system integrated with nucleic acid amplification has increasingly shown tremendous potential in microorganism detection. However, a general quantification strategy for total bacteria count based on the CRISPR/Cas12a system has not yet been developed. Herein, we established a sensitive bacterial quantification strategy based on the CRISPR/Cas12a system combined with magnetic covalent organic frameworks (MCOFs) and hybridization chain reaction (HCR). MCOFs acted as a carrier, adsorbing the ssDNA as HCR trigger sequence through π-π stacking. Then, the HCR circuit produces DNA duplexes containing the PAM sequences that activate the trans-cleavage activity of Cas12a for further signal amplification. Under the optimal conditions, the proposed method can quantify total bacteria in 50 min with a minimum detection concentration of 10 CFU/mL. The successful applications in food samples confirmed the feasibility and broad application prospects.
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Affiliation(s)
- Xuening Shi
- School of Public Health, Jilin University, Changchun 130021, China; State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, Jilin University, Changchun 130021,China.
| | - Hang Li
- School of Public Health, Jilin University, Changchun 130021, China.
| | - Shuo Yao
- School of Public Health, Jilin University, Changchun 130021, China.
| | - Yukun Ding
- School of Public Health, Jilin University, Changchun 130021, China.
| | - Xiuzhu Lin
- State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China.
| | - Hui Xu
- School of Public Health, Jilin University, Changchun 130021, China.
| | - Yi Liu
- School of Public Health, Jilin University, Changchun 130021, China.
| | - Chao Zhao
- School of Public Health, Jilin University, Changchun 130021, China.
| | - Tong Zhang
- State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China.
| | - Juan Wang
- School of Public Health, Jilin University, Changchun 130021, China; State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, Jilin University, Changchun 130021,China.
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Zhang Y, Tian G, Sun X, Yang X, Zhang Y, Tan W, Duan L, Gao S, Yu J. Ultrasensitive colorimetric detection of Staphylococcus aureus using wheat germ agglutinin and IgY as a dual-recognition strategy. Mikrochim Acta 2024; 191:209. [PMID: 38499840 DOI: 10.1007/s00604-024-06288-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Accepted: 02/26/2024] [Indexed: 03/20/2024]
Abstract
A novel colorimetric platform was designed for the determination of S. aureus by utilizing a dual-recognition strategy, where wheat germ agglutinin (WGA)-functionalized magnetic beads were served as separation elements to capture and enrich S. aureus efficiently from the matrix. Horseradish peroxidase (HRP) labeled chicken anti-protein A IgY (HRP-IgY) was used to label the captured S. aureus. A chicken IgY was introduced as a signal tracer to bind with staphylococcal protein A (SPA) on the surface of S. aureus, which can circumvent the interference from protein G-producing Streptococcus. Subsequently, the colorimetric signal was achieved by an HRP-catalyzed reaction, which was amplified by HRP-IgY bound by approximately 80,000 SPA molecules on one S. aureus. The entire detection process could be accomplished within 90 min. Under optimal conditions, the linear response of different S. aureus concentrations ranged from 7.8 × 102 to 2.0 × 105 CFU/mL and the limit of detection reached down to 3.9 × 102 CFU/mL. Some common non-target bacteria yielded negative results, indicating the excellent specificity of the method. The developed strategy was successfully applied to the determination of S. aureus in various types of samples with satisfactory recoveries. Therefore, the novel dual-recognition strategy possessed the advantages of high sensitivity, specificity, and low cost and exhibited considerable potential as a promising tool to defend public health.
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Affiliation(s)
- Yun Zhang
- Laboratory of Infection and Immunology, School of Medical Technology, Xinxiang Medical University, Xinxiang, 453003, People's Republic of China
| | - Ge Tian
- Laboratory of Infection and Immunology, School of Medical Technology, Xinxiang Medical University, Xinxiang, 453003, People's Republic of China
| | - Xueni Sun
- Laboratory of Infection and Immunology, School of Medical Technology, Xinxiang Medical University, Xinxiang, 453003, People's Republic of China
| | - Xiaoli Yang
- Laboratory of Infection and Immunology, School of Medical Technology, Xinxiang Medical University, Xinxiang, 453003, People's Republic of China
| | - Yi Zhang
- Laboratory of Infection and Immunology, School of Medical Technology, Xinxiang Medical University, Xinxiang, 453003, People's Republic of China
| | - Wenqing Tan
- Laboratory of Infection and Immunology, School of Medical Technology, Xinxiang Medical University, Xinxiang, 453003, People's Republic of China
| | - Liangwei Duan
- Laboratory of Infection and Immunology, School of Medical Technology, Xinxiang Medical University, Xinxiang, 453003, People's Republic of China.
| | - Shunxiang Gao
- Department of Ophthalmology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200080, People's Republic of China.
| | - Junping Yu
- Laboratory of Infection and Immunology, School of Medical Technology, Xinxiang Medical University, Xinxiang, 453003, People's Republic of China.
- CAS Key Laboratory of Special Pathogens and Biosafety, Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, 430071, People's Republic of China.
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Effect of Catechin on Yolk Immunoglobulin Structure and Properties: A Polyphenol-Protein Interaction Approach. Foods 2023; 12:foods12030462. [PMID: 36765991 PMCID: PMC9914673 DOI: 10.3390/foods12030462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2022] [Revised: 01/13/2023] [Accepted: 01/15/2023] [Indexed: 01/21/2023] Open
Abstract
The preparation of the interaction between polyphenols and protein is of great significance for increasing added value and promoting the application of egg yolk immunoglobulin (IgY). This study systematically investigated the effect of catechin on yolk immunoglobulin structural characteristics and functional properties. The binding conditions, force types, molecular conformation, and residual microenvironment of the interaction between catechin and IgY were analyzed by molecular docking technology, UV-vis absorption and fluorescence spectroscopy studies. The results showed that the main binding forces in the complex were hydrogen bonding and van der Waals forces. After the interaction, fluorescence quenching occurred and the maximum emission wavelength was redshifted. The results showed that the microenvironment around IgY increased polarity, increased hydrophilicity and decreased hydrophobicity, and the structure of the peptide chain changed. The bacteriostatic thermal stability of the compound against Escherichia coli and Staphylococcus aureus was lower than that of catechin IgY. The bacteriostatic acid and base stability were higher than that of catechin and IgY. The antioxidant activity was catechin, complex, and IgY, in descending order. The antioxidant activity of catechin and complex was significantly higher than that of IgY. At the same concentration, the apparent viscosity of the three samples was complex, IgY and catechin, in descending order. G' was greater than G" indicating that elastic properties dominate in G". The G' and G" values of the complex were higher than those of the other groups. Rheological results indicated that the complex may have high physical stability. This study provides theoretical support for broadening the application field of IgY and suggest its properties change in the machining process. It also provides new ideas for the development of functional foods from poultry eggs.
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