Investigation into the effect of the core structure, core-doped, core-doped/shell on the photoluminescence of nanoparticles applied to the detection of E. coli O 157:H7 and methicillin-resistant S. aureus (MRSA)

Diem Bui Thi, Liem Nguyen Quang, Khanh Pham Duy, Khiem Nguyen Van, Tang Nguyen Trong, Bich Luong Thi

Abstract


In this study, Mn-doped ZnSe/ZnS core/shell quantum dots (CSQDs) were synthesized in aqueous solution using 3-Mercaptopropionic Acid as a surface stabilizer and successfully applied in the detection of Escherichia coli O157:H7 and methicillin-resistant Staphylococcus aureus (MRSA) for the first time. The CSQDs were conjugated with anti-E. coli antibody and anti-MRSA antibody via protein A supported by 1-ethyl-3-(-3-dimethylaminopropyl)carbodiimide hydrochloride for fluorescent labeling of the intact bacterial cells. The etection was performed for the bacterial strains cultivated in Luria-Bertani liquid medium. The obtained results indicate that E. coli O157:H7 and MRSA can be detected within 30 min at a high sensitivity of 101 CFU/mL. This labeling method based on the highly fluorescent CSQDs may have great potential for use in the food industry to check and prevent outbreaks of foodborne illness.

Keywords


MPA; core-doped /shell; ZnSe:Mn/ZnS; synthesis of quantum dots in aqueous phase; ZnSe:Mn-MPA

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References


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DOI: https://doi.org/10.51316/jca.2021.105

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