| Citation: |
MUKADDAS Mijit, WANG Hui, PAN Dongxia, et al. Research on rapid detection of Staphylococcus aureus by fluorescent biosensor based on DNAzyme[J]. Journal of South China Agricultural University, 2024, 45(5): 764-771. DOI: 10.7671/j.issn.1001-411X.202405008
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To solve the problems of time-consuming and complex operation in traditional methods of detecting Staphylococcus aureus, a fluorescent biosensor based on deoxyribonuclease (DNAzyme) was developed to achieve rapid detection of S. aureus.
The fluorescence biosensor was made by combining DNAzyme with specific complementary chain substrate, and optimized for the concentration of biomaterials and pH of solution. Then, the specific detection of five different bacteria such as S. aureus, Escherichia coli, Bacillus, Streptococcus agalactiae and Proteus was performed. Finally, the DNAzyme-based fluorescent biosensor was tested and verified on milk samples.
The fluorescent biosensor based on DNAzyme can detect S. aureus within 3 min at a pH of 6.8, with a linear range of 1−1×107 cfu·mL−1 and a minimum detection limit of 1 cfu·mL−1.
The fluorescent biosensor based on DNAzyme solves the problems of time-consuming and complex operation of traditional detection methods, and realizes the rapid detection of S. aureus in milk, which has significant practical value.
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