Bacteriophage-Conjugated Fluorescent Nanoemulsion as a Novel Optical Probe for Highly Selective Bacterial Detection
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- Shin-ya Sekida
- Graduate School of Integrated Arts and Science, Kochi University, 2-5-1 Akebono-cho, Kochi 780-8520 , Japan
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- Takatoshi Chisaka
- Department of Applied Science, Faculty of Science and Technology, Kochi University, 2-5-1 Akebono-cho, Kochi 780-8520 , Japan
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- Jumpei Uchiyama
- Department of Bacteriology, Graduate School of Medicine Dentistry and Pharmaceutical Sciences, Okayama University, 2-5-1 Shikata-cho, Kita-ku, Okayama 700-8558 , Japan
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- Iyo Takemura-Uchiyama
- Department of Bacteriology, Graduate School of Medicine Dentistry and Pharmaceutical Sciences, Okayama University, 2-5-1 Shikata-cho, Kita-ku, Okayama 700-8558 , Japan
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- Shigenobu Matsuzaki
- Department of Medical Laboratory Science, Faculty of Health Sciences, Kochi Gakuen University, 292-26 Asahitenjin-cho, Kochi 780-0955 , Japan
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- Yosuke Niko
- Research and Education Faculty, Multidisciplinary Science Cluster, Interdisciplinary Science Unit, Kochi University, 2-5-1 Akebono-cho, Kochi 780-8520 , Japan
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- Shingo Hadano
- Research and Education Faculty, Multidisciplinary Science Cluster, Interdisciplinary Science Unit, Kochi University, 2-5-1 Akebono-cho, Kochi 780-8520 , Japan
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- Shigeru Watanabe
- Research and Education Faculty, Multidisciplinary Science Cluster, Interdisciplinary Science Unit, Kochi University, 2-5-1 Akebono-cho, Kochi 780-8520 , Japan
抄録
<jats:title>Abstract</jats:title> <jats:p>Infectious disease mortality has decreased due to effective drugs and healthcare. However, global health remains threatened by infectious diseases. New methods of rapid and accurate bacterial detection have attracted considerable attention. Fluorescence detection of whole bacterial cells offers high sensitivity, quantitative analysis, and simple operation. A highly fluorescent bioconjugated probe improves sensitivity and selectivity. This study presents a novel, bright fluorescent probe comprising a bacteriophage and a fluorescent nanoemulsion (fNE) as biorecognition and signal transduction elements, respectively. We demonstrate that fluorescence microscopy imaging using the S. aureus-specific phage, S13′-fNE (phage-fNE), detects S. aureus in the presence of E. coli or S. pseudintermedius, another closely related Staphylococci, in a highly selective manner. Furthermore, fNEs with high dye loadings exhibit considerably greater brightness compared to the fluorescent dye alone, making them suitable for sensitive fluorescence imaging. Phage-fNEs can quantitatively detect S. aureus at 104–108 colony-forming units per milliliter (CFU mL−1), with a limit of detection of 8 × 104 CFU mL−1. This result is comparable to the lowest value achieved by microscopic bacterial detection, with no preconcentration or enzymatic signal enhancement methods used. Bioconjugated fNEs open new avenues for highly selective and sensitive fluorescent detection of bacteria.</jats:p>
収録刊行物
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- Bulletin of the Chemical Society of Japan
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Bulletin of the Chemical Society of Japan 96 (11), 1234-1242, 2023-09-23
Oxford University Press (OUP)