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Zhou W, Deng A, Fan X, Han Y, Gao Y, Yuan L, Zheng X, Xiong D, Xu X, Zhu G, Yang Z. Characterisation of a SapYZU11@ZnFe 2O 4 biosensor reveals its mechanism for the rapid and sensitive colourimetric detection of viable Staphylococcus aureus in food matrices. Food Microbiol 2024; 122:104560. [PMID: 38839236 DOI: 10.1016/j.fm.2024.104560] [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: 03/02/2024] [Revised: 05/02/2024] [Accepted: 05/07/2024] [Indexed: 06/07/2024]
Abstract
Although bacteriophage-based biosensors hold promise for detecting Staphylococcus aureus in food products in a timely, simple, and sensitive manner, the associated targeting mechanism of the biosensors remains unclear. Herein, a colourimetric biosensor SapYZU11@ZnFe2O4, based on a broad-spectrum S. aureus lytic phage SapYZU11 and a ZnFe2O4 nanozyme, was constructed, and its capacity to detect viable S. aureus in food was evaluated. Characterisation of SapYZU11@ZnFe2O4 revealed its effective immobilisation, outstanding biological activity, and peroxidase-like capability. The peroxidase activity of SapYZU11@ZnFe2O4 significantly decreased after the addition of S. aureus, potentially due to blockage of the nanozyme active sites. Moreover, SapYZU11@ZnFe2O4 can detect S. aureus from various sources and S. aureus isolates that phage SapYZU11 could not lyse. This may be facilitated by the adsorption of the special receptor-binding proteins on the phage tail fibre and wall teichoic acid receptors of S. aureus. Besides, SapYZU11@ZnFe2O4 exhibited remarkable sensitivity and specificity when employing colourimetric techniques to rapidly determine viable S. aureus counts in food samples, with a detection limit of 0.87 × 102 CFU/mL. Thus, SapYZU11@ZnFe2O4 has broad application prospects for the detection of viable S. aureus cells on food substrates.
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Affiliation(s)
- Wenyuan Zhou
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu, 225127, China; College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, 225009, China; Yangzhou Engineering Research Center of Food Intelligent Packaging and Preservation Technology, Yangzhou University, Yangzhou, Jiangsu, 225127, China
| | - Aiping Deng
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu, 225127, China
| | - Xiaoxing Fan
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu, 225127, China
| | - Yeling Han
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu, 225127, China
| | - Yajun Gao
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu, 225127, China
| | - Lei Yuan
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu, 225127, China; Yangzhou Engineering Research Center of Food Intelligent Packaging and Preservation Technology, Yangzhou University, Yangzhou, Jiangsu, 225127, China
| | - Xiangfeng Zheng
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu, 225127, China; Yangzhou Engineering Research Center of Food Intelligent Packaging and Preservation Technology, Yangzhou University, Yangzhou, Jiangsu, 225127, China
| | - Dan Xiong
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu, 225127, China; Yangzhou Engineering Research Center of Food Intelligent Packaging and Preservation Technology, Yangzhou University, Yangzhou, Jiangsu, 225127, China
| | - Xuechao Xu
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu, 225127, China; Yangzhou Engineering Research Center of Food Intelligent Packaging and Preservation Technology, Yangzhou University, Yangzhou, Jiangsu, 225127, China
| | - Guoqiang Zhu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, 225009, China.
| | - Zhenquan Yang
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu, 225127, China; Yangzhou Engineering Research Center of Food Intelligent Packaging and Preservation Technology, Yangzhou University, Yangzhou, Jiangsu, 225127, China.
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Xu WT, Lu XY, Wang Y, Li MH, Hu K, Shen ZJ, Sun XQ, Zhang YM. A Lateral Flow-Recombinase Polymerase Amplification Method for Colletotrichum gloeosporioides Detection. J Fungi (Basel) 2024; 10:315. [PMID: 38786670 PMCID: PMC11121841 DOI: 10.3390/jof10050315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2024] [Revised: 04/17/2024] [Accepted: 04/22/2024] [Indexed: 05/25/2024] Open
Abstract
The greater yam (Dioscorea alata), a widely cultivated and nutritious food crop, suffers from widespread yield reduction due to anthracnose caused by Colletotrichum gloeosporioides. Latent infection often occurs before anthracnose phenotypes can be detected, making early prevention difficult and causing significant harm to agricultural production. Through comparative genomic analysis of 60 genomes of 38 species from the Colletotrichum genus, this study identified 17 orthologous gene groups (orthogroups) that were shared by all investigated C. gloeosporioides strains but absent from all other Colletotrichum species. Four of the 17 C. gloeosporioides-specific orthogroups were used as molecular markers for PCR primer designation and C. gloeosporioides detection. All of them can specifically detect C. gloeosporioides out of microbes within and beyond the Colletotrichum genus with different sensitivities. To establish a rapid, portable, and operable anthracnose diagnostic method suitable for field use, specific recombinase polymerase amplification (RPA) primer probe combinations were designed, and a lateral flow (LF)-RPA detection kit for C. gloeosporioides was developed, with the sensitivity reaching the picogram (pg) level. In conclusion, this study identified C. gloeosporioides-specific molecular markers and developed an efficient method for C. gloeosporioides detection, which can be applied to the prevention and control of yam anthracnose as well as anthracnose caused by C. gloeosporioides in other crops. The strategy adopted by this study also serves as a reference for the identification of molecular markers and diagnosis of other plant pathogens.
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Affiliation(s)
- Wei-Teng Xu
- Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China; (W.-T.X.); (X.-Y.L.); (Y.W.); (M.-H.L.); (K.H.); (Z.-J.S.); (X.-Q.S.)
- Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Nanjing 210014, China
- Jiangsu Provincial Science and Technology Resources Coordination Platform (Agricultural Germplasm Resources) Germplasm Resources Nursery of Medicinal Plants, Nanjing 210014, China
| | - Xin-Yu Lu
- Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China; (W.-T.X.); (X.-Y.L.); (Y.W.); (M.-H.L.); (K.H.); (Z.-J.S.); (X.-Q.S.)
- Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Nanjing 210014, China
- Jiangsu Provincial Science and Technology Resources Coordination Platform (Agricultural Germplasm Resources) Germplasm Resources Nursery of Medicinal Plants, Nanjing 210014, China
| | - Yue Wang
- Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China; (W.-T.X.); (X.-Y.L.); (Y.W.); (M.-H.L.); (K.H.); (Z.-J.S.); (X.-Q.S.)
- Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Nanjing 210014, China
- Jiangsu Provincial Science and Technology Resources Coordination Platform (Agricultural Germplasm Resources) Germplasm Resources Nursery of Medicinal Plants, Nanjing 210014, China
| | - Ming-Han Li
- Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China; (W.-T.X.); (X.-Y.L.); (Y.W.); (M.-H.L.); (K.H.); (Z.-J.S.); (X.-Q.S.)
- Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Nanjing 210014, China
- Jiangsu Provincial Science and Technology Resources Coordination Platform (Agricultural Germplasm Resources) Germplasm Resources Nursery of Medicinal Plants, Nanjing 210014, China
| | - Ke Hu
- Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China; (W.-T.X.); (X.-Y.L.); (Y.W.); (M.-H.L.); (K.H.); (Z.-J.S.); (X.-Q.S.)
- Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Nanjing 210014, China
- Jiangsu Provincial Science and Technology Resources Coordination Platform (Agricultural Germplasm Resources) Germplasm Resources Nursery of Medicinal Plants, Nanjing 210014, China
| | - Zi-Jie Shen
- Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China; (W.-T.X.); (X.-Y.L.); (Y.W.); (M.-H.L.); (K.H.); (Z.-J.S.); (X.-Q.S.)
- Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Nanjing 210014, China
- Jiangsu Provincial Science and Technology Resources Coordination Platform (Agricultural Germplasm Resources) Germplasm Resources Nursery of Medicinal Plants, Nanjing 210014, China
| | - Xiao-Qin Sun
- Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China; (W.-T.X.); (X.-Y.L.); (Y.W.); (M.-H.L.); (K.H.); (Z.-J.S.); (X.-Q.S.)
- Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Nanjing 210014, China
- Jiangsu Provincial Science and Technology Resources Coordination Platform (Agricultural Germplasm Resources) Germplasm Resources Nursery of Medicinal Plants, Nanjing 210014, China
| | - Yan-Mei Zhang
- Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China; (W.-T.X.); (X.-Y.L.); (Y.W.); (M.-H.L.); (K.H.); (Z.-J.S.); (X.-Q.S.)
- Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Nanjing 210014, China
- Jiangsu Provincial Science and Technology Resources Coordination Platform (Agricultural Germplasm Resources) Germplasm Resources Nursery of Medicinal Plants, Nanjing 210014, China
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Li X, Li G, Pan Q, Xue F, Wang Z, Peng C. Rapid and ultra-sensitive lateral flow assay for pathogens based on multivalent aptamer and magnetic nanozyme. Biosens Bioelectron 2024; 250:116044. [PMID: 38271888 DOI: 10.1016/j.bios.2024.116044] [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: 11/23/2023] [Revised: 01/03/2024] [Accepted: 01/13/2024] [Indexed: 01/27/2024]
Abstract
Ultra-sensitive LFA methods for pathogen detection commonly depended on tedious and time-consuming nucleic acid amplification. Here, a high affinity multivalent aptamer (multi-Apt) for S. aureus was obtained through exquisite engineering design. The scaffold and conformation of the multi-Apt were found to be key factors in the detection signal of aptsensors. After optimization, the binding affinity of the multi-Apt to S. aureus was improved by more than 8-fold from 135.9 nM to 16.77 nM. By the joint use of the multi-Apt and a multifunctional nanozyme Fe3O4@MOF@PtPd, a fast and ultra-sensitive LFA for S. aureus was developed (termed MA-MN LFA). In this method, a Fe3O4@MOF@PtPd nanozyme was modified with vancomycin and could efficiently capture and separate S. aureus. Moreover, the multi-Apt worked together with the nanozyme to bind with S. aureus to form a ternary complex at the same time, which simply the fabrication of LFA strip. The developed MA-MN LFA could detect S. aureus as low as 2 CFU/mL within 30 min and a wide linear range of 10-1 × 108 CFU/mL was obtained. The detection is easily operated, fast (can be completed within 30 min) and versatile for Gram-positive pathogens, thus has great potential as a powerful tool in pathogen detection.
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Affiliation(s)
- Xiuping Li
- State Key Laboratory of Food Science and Resources, Jiangnan University, Lihu Road 1800, Wuxi 214122, PR China; School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, PR China
| | - Guowen Li
- State Key Laboratory of Food Science and Resources, Jiangnan University, Lihu Road 1800, Wuxi 214122, PR China; School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, PR China
| | - Qiuli Pan
- Shandong Institute for Food and Drug Control, Jinan 250101, PR China
| | - Feng Xue
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Zhouping Wang
- State Key Laboratory of Food Science and Resources, Jiangnan University, Lihu Road 1800, Wuxi 214122, PR China; School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, PR China; International Joint Laboratory on Food Safety, Jiangnan University, Lihu Road 1800, Wuxi 214122, PR China
| | - Chifang Peng
- State Key Laboratory of Food Science and Resources, Jiangnan University, Lihu Road 1800, Wuxi 214122, PR China; School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, PR China; International Joint Laboratory on Food Safety, Jiangnan University, Lihu Road 1800, Wuxi 214122, PR China.
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4
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Feng Q, Wu T, Wang H, Wu M, Dou B, Wang P. Two-step resonance-energy-transfer-based ratiometric biosensor for sensing and annihilation of Staphylococcus aureus. Chem Commun (Camb) 2024; 60:2046-2049. [PMID: 38287913 DOI: 10.1039/d3cc05300h] [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: 01/31/2024]
Abstract
A two-step resonance energy transfer (RET)-based fluorescence/electrochemiluminescence (FL/ECL) biosensor was developed for ratiometric measurement and annihilation of Staphylococcus aureus (S. aureus). Using coupled dual-recognition-triggered target conversion with the catalytic hairpin assembly (CHA) technique, the monitoring of S. aureus was obtained at the single-cell level.
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Affiliation(s)
- Qiumei Feng
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, China.
| | - Tao Wu
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, China.
| | - Huan Wang
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, China.
| | - Meisheng Wu
- Department of Chemistry, College of Science, Nanjing Agricultural University, Nanjing 210095, China.
| | - Baoting Dou
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, China.
| | - Po Wang
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, China.
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5
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Gu Q, Lin T, Wei X, Zhang Y, Wu S, Yang X, Zhao H, Wang C, Wang J, Ding Y, Zhang J, Wu Q. Prevalence of antimicrobial resistance in a full-scale drinking water treatment plant. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 344:118396. [PMID: 37331316 DOI: 10.1016/j.jenvman.2023.118396] [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: 09/27/2022] [Revised: 05/27/2023] [Accepted: 06/12/2023] [Indexed: 06/20/2023]
Abstract
Antibiotic resistance in drinking water has received increasing attention in recent years. In this study, the occurrence and abundance of antibiotic resistance genes (ARGs) in a drinking water treatment plant (DWTP) was comprehensively investigated using metagenomics. Bioinformatics analysis showed that 381 ARG subtypes belonging to 15 ARG types were detected, and bacitracin had the highest abundance (from 0.26 × 10-2 to 0.86 copies/cell), followed by multidrug (from 0.57 × 10-1 to 0.47 copies/cell) and sulfonamide (from 0.83 × 10-2 to 0.35 copies/cell). Additionally, 933 ARG-carrying contigs (ACCs) were obtained from the metagenomic data, among which 153 contigs were annotated as pathogens. The most abundant putative ARG host was Staphylococcus (7.9%), which most frequently carried multidrug ARGs (43.2%). Additionally, 38 high-quality metagenome-assembled genomes (MAGs) were recovered, one of which was identified as Staphylococcus aureus (Bin.624) and harboured the largest number of ARGs (n = 16). Using the cultivation technique, 60 isolates were obtained from DWTP samples, and Staphylococcus spp. (n = 11) were found to be dominant in all isolates, followed by Bacillus spp. (n = 17). Antimicrobial susceptibility testing showed that most Staphylococcus spp. were multidrug resistant (MDR). These results deepen our understanding of the distribution profiles of ARGs and antibiotic resistant bacteria (ARB) in DWTPs for potential health risk evaluation. Our study also highlights the need for new and efficient water purification technologies that can be introduced and applied in DWTPs.
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Affiliation(s)
- Qihui Gu
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, 510070, PR China
| | - Tao Lin
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, 510070, PR China; School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, Guangdong, PR China
| | - Xianhu Wei
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, 510070, PR China
| | - Youxiong Zhang
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, 510070, PR China
| | - Shi Wu
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, 510070, PR China
| | - Xiaojuan Yang
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, 510070, PR China
| | - Hui Zhao
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, 510070, PR China
| | - Chufang Wang
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, 510070, PR China
| | - Juan Wang
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, 510070, PR China
| | - Yu Ding
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, 510070, PR China; Department of Food Science and Engineering, Institute of Food Safety and Nutrition, College of Science and Engineering, College of Life Science and Technology, Jinan University, Guangzhou 510632, China
| | - Jumei Zhang
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, 510070, PR China
| | - Qingping Wu
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, 510070, PR China.
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Zhong W, Tang M, Xie Y, Huang X, Liu Y. Tea Polyphenols Inhibit the Activity and Toxicity of Staphylococcus aureus by Destroying Cell Membranes and Accumulating Reactive Oxygen Species. Foodborne Pathog Dis 2023; 20:294-302. [PMID: 37347934 DOI: 10.1089/fpd.2022.0085] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/24/2023] Open
Abstract
Staphylococcus aureus can cause bacterial food intoxication and seriously affect human health. Tea polyphenols (TP) are a kind of natural, safe, and broad-spectrum bacteriostatic substances, with a wide range of bacteriostatic effects. In the study, we explored the possible bacteriostatic mode of TP. The minimum inhibitory concentration of TP against S. aureus was 64 μg/mL. Protein, DNA, and K+ leak experiments, fluorescence microscopy, and transmission electron microscopy suggested that TP disrupt cell membranes, leading to intracellular component loss. By studying the effect of TP on the toxicity of S. aureus, it was found that the expression levels of two toxin genes, coa and spa, were downregulated by 2.37 and 32.6, respectively. Furthermore, after treatment with TP, a large number of reactive oxygen species (ROS) were propagated and released, leading to oxidative stress in cells. We speculated that the bacteriostatic mechanism of TP may be through the destruction of the cell membrane and ROS-mediated oxidative stress. Meanwhile, the hemolysis activity proved the safety of TP. Our results suggested that TP may be a potential antimicrobial agent for food.
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Affiliation(s)
- Weiwei Zhong
- Department of Food Science and Engineering, Zhejiang-Malaysia Joint Research Laboratory for Agricultural Product Processing and Nutrition, Zhejiang Provincial Key Laboratory of Animal Protein Food Intensive Processing Technology, Ningbo University, Ningbo, China
| | - Mengsheng Tang
- Department of Food Science and Engineering, Zhejiang-Malaysia Joint Research Laboratory for Agricultural Product Processing and Nutrition, Zhejiang Provincial Key Laboratory of Animal Protein Food Intensive Processing Technology, Ningbo University, Ningbo, China
| | - Yan Xie
- Department of Food Science and Engineering, Zhejiang-Malaysia Joint Research Laboratory for Agricultural Product Processing and Nutrition, Zhejiang Provincial Key Laboratory of Animal Protein Food Intensive Processing Technology, Ningbo University, Ningbo, China
| | - Xianqing Huang
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Yanan Liu
- Department of Food Science and Engineering, Zhejiang-Malaysia Joint Research Laboratory for Agricultural Product Processing and Nutrition, Zhejiang Provincial Key Laboratory of Animal Protein Food Intensive Processing Technology, Ningbo University, Ningbo, China
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7
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Endres CM, Moreira E, de Freitas AB, Castel APD, Graciano F, Mann MB, Frazzon APG, Mayer FQ, Frazzon J. Evaluation of Enterotoxins and Antimicrobial Resistance in Microorganisms Isolated from Raw Sheep Milk and Cheese: Ensuring the Microbiological Safety of These Products in Southern Brazil. Microorganisms 2023; 11:1618. [PMID: 37375120 DOI: 10.3390/microorganisms11061618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 06/08/2023] [Accepted: 06/15/2023] [Indexed: 06/29/2023] Open
Abstract
This study emphasizes the importance of monitoring the microbiological quality of animal products, such as raw sheep's milk and cheese, to ensure food safety. In Brazil, there is currently no legislation governing the quality of sheep's milk and its derivatives. Therefore, this study aimed to evaluate: (i) the hygienic-sanitary quality of raw sheep's milk and cheese produced in southern Brazil; (ii) the presence of enterotoxins and Staphylococcus spp. in these products; and (iii) the susceptibility of the isolated Staphylococcus spp. to antimicrobial drugs and the presence of resistance genes. A total of 35 samples of sheep's milk and cheese were examined. The microbiological quality and presence of enterotoxins were accessed using Petrifilm and VIDAS SET2 methods, respectively. Antimicrobial susceptibility tests were conducted using VITEK 2 equipment and the disc diffusion method. The presence of resistance genes tet(L), sul1, sul2, ermB, tetM, AAC(6)', tetW, and strA were evaluated through PCR. In total, 39 Staphylococcus spp. were obtained. The resistance genes tetM, ermB, strA, tetL, sul1, AAC(6)', and sul2 were detected in 82%, 59%, 36%, 28%, 23%, 3%, and 3% of isolates, respectively. The findings revealed that both raw sheep's milk and cheese contained Staphylococcus spp. that exhibited resistance to antimicrobial drugs and harbored resistance genes. These results underscore the immediate need for specific legislation in Brazil to regulate the production and sale of these products.
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Affiliation(s)
- Creciana M Endres
- Department of Food Science, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre 91501-970, RS, Brazil
- SENAI/SC University Center, UniSENAI-Campus Blumenau, Blumenau 89036-256, SC, Brazil
| | - Eliana Moreira
- SENAI/SC University Center, UniSENAI-Campus Chapecó, Chapecó 89813-000, SC, Brazil
| | | | | | - Fábio Graciano
- Senior Field Application Specialist-Industry, BioMérieux Brasil SA, Indianópolis 04028-001, SP, Brazil
| | - Michele B Mann
- Department of Microbiology, Immunology and Parasitology, UFRGS, Porto Alegre 90010-150, RS, Brazil
| | - Ana Paula G Frazzon
- Department of Microbiology, Immunology and Parasitology, UFRGS, Porto Alegre 90010-150, RS, Brazil
| | - Fabiana Q Mayer
- Department of Molecular Biology and Biotechnology, UFRGS, Porto Alegre 90010-150, RS, Brazil
| | - Jeverson Frazzon
- Department of Food Science, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre 91501-970, RS, Brazil
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8
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A label-free AuNP bioprobe-assisted CRISPR/Cas12a colorimetric platform for high-throughput detection of Staphylococcus aureus ST398. Food Control 2023. [DOI: 10.1016/j.foodcont.2022.109451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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9
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Shao L, Sun Y, Zou B, Zhao Y, Li X, Dai R. Sublethally injured microorganisms in food processing and preservation: Quantification, formation, detection, resuscitation and adaption. Food Res Int 2023; 165:112536. [PMID: 36869540 DOI: 10.1016/j.foodres.2023.112536] [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: 11/06/2022] [Revised: 01/14/2023] [Accepted: 01/21/2023] [Indexed: 01/29/2023]
Abstract
Sublethally injured state has been recognized as a survival strategy for microorganisms suffering from stressful environments. Injured cells fail to grow on selective media but can normally grow on nonselective media. Numerous microorganism species can form sublethal injury in various food matrices during processing and preservation with different techniques. Injury rate was commonly used to evaluate sublethal injury, but mathematical models for the quantification and interpretation of sublethally injured microbial cells still require further study. Injured cells can repair themselves and regain viability on selective media under favorable conditions when stress is removed. Conventional culture methods might underestimate microbial counts or present a false negative result due to the presence of injured cells. Although the structural and functional components may be affected, the injured cells pose a great threat to food safety. This work comprehensively reviewed the quantification, formation, detection, resuscitation and adaption of sublethally injured microbial cells. Food processing techniques, microbial species, strains and food matrix all significantly affect the formation of sublethally injured cells. Culture-based methods, molecular biological methods, fluorescent staining and infrared spectroscopy have been developed to detect the injured cells. Cell membrane is often repaired first during resuscitation of injured cells, meanwhile, temperature, pH, media and additives remarkably influence the resuscitation. The adaption of injured cells negatively affects the microbial inactivation during food processing.
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Affiliation(s)
- Lele Shao
- Beijing Higher Institution Engineering Research Center of Animal Product, College of Food Science and Nutritional Engineering, China Agricultural University, No. 17 Qinghua East Road, Haidian District, Beijing 100083, PR China
| | - Yingying Sun
- Beijing Higher Institution Engineering Research Center of Animal Product, College of Food Science and Nutritional Engineering, China Agricultural University, No. 17 Qinghua East Road, Haidian District, Beijing 100083, PR China
| | - Bo Zou
- Beijing Higher Institution Engineering Research Center of Animal Product, College of Food Science and Nutritional Engineering, China Agricultural University, No. 17 Qinghua East Road, Haidian District, Beijing 100083, PR China
| | - Yijie Zhao
- Beijing Higher Institution Engineering Research Center of Animal Product, College of Food Science and Nutritional Engineering, China Agricultural University, No. 17 Qinghua East Road, Haidian District, Beijing 100083, PR China
| | - Xingmin Li
- Beijing Higher Institution Engineering Research Center of Animal Product, College of Food Science and Nutritional Engineering, China Agricultural University, No. 17 Qinghua East Road, Haidian District, Beijing 100083, PR China
| | - Ruitong Dai
- Beijing Higher Institution Engineering Research Center of Animal Product, College of Food Science and Nutritional Engineering, China Agricultural University, No. 17 Qinghua East Road, Haidian District, Beijing 100083, PR China.
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Xiang X, Lu J, Xu X, Hou X, Diao E, Qian S, Song H, Liang L, He Y, Shang Y. Rapid identification of novel specific molecular targets for PCR detection of four Enterococcus species. Lebensm Wiss Technol 2022. [DOI: 10.1016/j.lwt.2022.114356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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11
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Kim E, Yang SM, Kim IS, Lee SY, Kim HY. Identification of Leuconostoc species based on novel marker genes identified using real-time PCR via computational pangenome analysis. Front Microbiol 2022; 13:1014872. [PMID: 36212836 PMCID: PMC9537375 DOI: 10.3389/fmicb.2022.1014872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Accepted: 09/06/2022] [Indexed: 11/29/2022] Open
Abstract
Leuconostoc species are important microorganisms in food fermentation but also cause food spoilage. Although these species are commercially important, their taxonomy is still based on inaccurate identification methods. Here, we used computational pangenome analysis to develop a real-time PCR-based method for identifying and differentiating the 12 major Leuconostoc species found in food. Analysis of pan and core-genome phylogenies showed clustering of strains into 12 distinct groups according to the species. Pangenome analysis of 130 Leuconostoc genomes from these 12 species enabled the identification of each species-specific gene. In silico testing of the species-specific genes against 143 publicly available Leuconostoc and 100 other lactic acid bacterial genomes showed that all the assays had 100% inclusivity/exclusivity. We also verified the specificity for each primer pair targeting each specific gene using 23 target and 124 non-target strains and found high specificity (100%). The sensitivity of the real-time PCR method was 102 colony forming units (CFUs)/ml in pure culture and spiked food samples. All standard curves showed good linear correlations, with an R2 value of ≥0.996, suggesting that screened targets have good specificity and strong anti-interference ability from food sample matrices and non-target strains. The real-time PCR method can be potentially used to determine the taxonomic status and identify the Leuconostoc species in foods.
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Kim E, Kim DS, Yang SM, Kim HY. The accurate identification and quantification of six Enterococcus species using quantitative polymerase chain reaction based novel DNA markers. Lebensm Wiss Technol 2022. [DOI: 10.1016/j.lwt.2022.113769] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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13
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Temporal sensing platform based on anodic dissolution of Ag and cathodic biocatalysis of oxygen reduction for Staphylococcus aureus detection. Food Chem 2022; 383:132404. [DOI: 10.1016/j.foodchem.2022.132404] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Revised: 12/19/2021] [Accepted: 02/07/2022] [Indexed: 11/17/2022]
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14
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Kim E, Yang SM, Kim IS, Kim HY. Identification of novel molecular targets for Weissella species-specific real-time PCR based on pangenome analysis. Appl Microbiol Biotechnol 2022; 106:4157-4168. [PMID: 35672470 DOI: 10.1007/s00253-022-12003-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 05/24/2022] [Accepted: 05/26/2022] [Indexed: 01/24/2023]
Abstract
Some Weissella species are used in probiotic products because of their beneficial effects in humans, whereas some species are considered as opportunistic pathogens that cause infections in humans. Therefore, an accurate and rapid identification of Weissella species is essential to control pathogenic Weissella species or isolate new functional strains with probiotic effects from their habitat. The objective of our study was to extract novel molecular targets using pangenome analysis for the identification of major Weissella species present in food. With 50 genomes representing 11 Weissella species, novel molecular targets were mined based on their 100% presence in the respective strains of the target species and absence in the strains of non-target bacteria. Primers based on molecular targets showed positive results for the corresponding species, whereas 79 non-target strains showed negative results. Standard curves revealed good linearity in the range of 103-108 colony-forming units per reaction. Our method was successfully applied to 74 Weissella strains isolated from food samples to demonstrate that the molecular targets provided a viable alternative to the 16S rRNA sequence. Furthermore, it was possible to identify and quantify Weissella communities in fermented foods. These results demonstrate that our method can be used for effective and accurate screening for the presence of Weissella species in foods. KEY POINTS: • This is first study to mine novel targets for differentiating 11 Weissella species. • The novel targets showed higher resolution than the 16S rRNA gene sequence. • The PCR method effectively detected Weissella species with opposing properties.
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Affiliation(s)
- Eiseul Kim
- Institute of Life Sciences & Resources and Department of Food Science and Biotechnology, Kyung Hee University, Yongin, 17104, Republic of Korea
| | - Seung-Min Yang
- Institute of Life Sciences & Resources and Department of Food Science and Biotechnology, Kyung Hee University, Yongin, 17104, Republic of Korea
| | - Ik-Seon Kim
- Institute of Life Sciences & Resources and Department of Food Science and Biotechnology, Kyung Hee University, Yongin, 17104, Republic of Korea
| | - Hae-Yeong Kim
- Institute of Life Sciences & Resources and Department of Food Science and Biotechnology, Kyung Hee University, Yongin, 17104, Republic of Korea.
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15
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Xi J, Cui G, Dong M, Sun C, Wang Y, Xu N, Zhang J, Wang L. Bioinspired fabrication of bifunctional antibody-enzyme co-assembled nanocomposites for chemiluminescence immunoassays of E. coli O157:H7. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2022; 14:1414-1419. [PMID: 35311849 DOI: 10.1039/d2ay00269h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Immunoassays based on enzyme-labeled antibodies have been widely used in the food safety field. However, the production process of enzyme-labeled antibodies is complicated and the low storage stability limits their application. Herein, antibody-horseradish peroxidase (HRP) co-assembled nanocomposites (AHC NCs) with outstanding advantages such as enhanced stability, lower cost, and substrate affinity were successfully prepared via a one-pot green method. Then the AHC NCs were employed as an alternative to traditional enzyme-labeled antibodies to develop a chemiluminescence enzyme immunoassay (CLEIA) toward Escherichia coli (E. coli) O157:H7. Under optimal conditions, E. coli O157:H7 can be detected in a linear range from 1 × 103 CFU mL-1 to 5 × 106 CFU mL-1, while the limit of detection (LOD) is as low as 2.2 × 102 CFU mL-1 (3σ). A series of repeatability studies showed reproducible results with a coefficient of variation of less than 7%. In addition, the proposed CLEIA was successfully applied to the analysis of spiked samples (tap water) and gave quantitative recoveries from 93.72% to 100.72%. This work demonstrates that the developed CLEIA can be applied as a universal platform for specific detection of diversified analytes.
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Affiliation(s)
- Jinnan Xi
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, 130118, P. R. China.
| | - Guihua Cui
- Jilin Medical University, Jilin, 132013, P. R. China.
| | - Mingxin Dong
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, 130122, P. R. China.
| | - Chengbiao Sun
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, 130122, P. R. China.
| | - Yan Wang
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, 130122, P. R. China.
| | - Na Xu
- Jilin Medical University, Jilin, 132013, P. R. China.
| | - Jianxu Zhang
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, 130122, P. R. China.
| | - Longtao Wang
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, 130118, P. R. China.
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Wang H, Fan Y, Yang Q, Sun X, Liu H, Chen W, Aziz A, Wang S. Boosting the Electrochemical Performance of PI-5-CA/C-SWCNT Nanohybrid for Sensitive Detection of E. coli O157:H7 From the Real Sample. Front Chem 2022; 10:843859. [PMID: 35223774 PMCID: PMC8866332 DOI: 10.3389/fchem.2022.843859] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Accepted: 01/17/2022] [Indexed: 01/04/2023] Open
Abstract
Redox activity is an important indicator for evaluating electrochemical biosensors. In this work, we have successfully polymerized indole-5-carboxylic acid into poly-5-carboxyindole nanomaterials (PI-5-CA), using its superior redox activity, and introduced carboxylated single-walled carbon nanotubes (C-SWCNTs) to synthesize a composite material. Finally, a synthesized composite material was used for the modification of the glass carbon electrode to fabricate the PI-5-CA/C-SWCNTs/GCE-based immunosensor and was successfully applied for the sensitive detection of E. coli O157:H7. The fabricated immunosensor exhibited an outstanding electrocatalytic activity toward the detection of E. coli O157:H7 with a remarkably lowest limit of detection (2.5 CFU/ml, LOD = 3 SD/k, n = 3) and has a wide linear range from 2.98×101 to 2.98×107 CFU/ml. Inspired from the excellent results, the fabricated electrode was applied for the detection of bacteria from real samples (water samples) with a good recovery rate (98.13–107.69%) as well as an excellent stability and specificity. Owing to its simple preparation, excellent performance, and detection time within 30 min, our proposed immunosensor will open a new horizon in different fields for the sensitive detection of bacteria from real samples.
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Affiliation(s)
- Huan Wang
- Advanced Biomaterials and Tissue Engineering Center, College of Life Science and Technology, Huazhong University of Life Science and Technology, Wuhan, China
| | - Yanmiao Fan
- School of Chemical Science and Engineering Fiber and Polymer Technology, KTH Royal Institute of Technology, Stockholm, Sweden
| | - Qiaoli Yang
- Advanced Biomaterials and Tissue Engineering Center, College of Life Science and Technology, Huazhong University of Life Science and Technology, Wuhan, China
| | - Xiaoyu Sun
- Advanced Biomaterials and Tissue Engineering Center, College of Life Science and Technology, Huazhong University of Life Science and Technology, Wuhan, China
| | - Hao Liu
- Advanced Biomaterials and Tissue Engineering Center, College of Life Science and Technology, Huazhong University of Life Science and Technology, Wuhan, China
| | - Wei Chen
- Advanced Biomaterials and Tissue Engineering Center, College of Life Science and Technology, Huazhong University of Life Science and Technology, Wuhan, China
| | - Ayesha Aziz
- Advanced Biomaterials and Tissue Engineering Center, College of Life Science and Technology, Huazhong University of Life Science and Technology, Wuhan, China
- *Correspondence: Ayesha Aziz, ; Shenqi Wang,
| | - Shenqi Wang
- Advanced Biomaterials and Tissue Engineering Center, College of Life Science and Technology, Huazhong University of Life Science and Technology, Wuhan, China
- *Correspondence: Ayesha Aziz, ; Shenqi Wang,
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Real-Time PCR Method for the Rapid Detection and Quantification of Pathogenic Staphylococcus Species Based on Novel Molecular Target Genes. Foods 2021; 10:foods10112839. [PMID: 34829120 PMCID: PMC8618141 DOI: 10.3390/foods10112839] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2021] [Revised: 11/09/2021] [Accepted: 11/15/2021] [Indexed: 01/03/2023] Open
Abstract
Coagulase-positive Staphylococcus aureus is a foodborne pathogen considered one of the causes of food-related disease outbreaks. Like S. aureus, Staphylococcus capitis, Staphylococcus caprae, and S. epidermidis are opportunistic pathogens causing clinical infections and food contamination. The objective of our study was to develop a rapid, accurate, and monitoring technique to detect four Staphylococcus species in food. Four novel molecular targets (GntR family transcriptional regulator for S. aureus, phosphomannomutase for S. epidermidis, FAD-dependent urate hydroxylase for S. capitis, and Gram-positive signal peptide protein for S. caprae) were mined based on pan-genome analysis. Primers targeting molecular target genes showed 100% specificity for 100 non-target reference strains. The detection limit in pure cultures and artificially contaminated food samples was 102 colony-forming unit/mL for S. aureus, S. capitis, S. caprae, and S. epidermidis. Moreover, real-time polymerase chain reaction successfully detected strains isolated from various food matrices. Thus, our method allows an accurate and rapid monitoring of Staphylococcus species and may help control staphylococcal contamination of food.
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