Journal
BIOSENSORS & BIOELECTRONICS
Volume 142, Issue -, Pages -Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2019.111570
Keywords
Staphylococcus aureus; Dual-recognition mode; Staphylococcal protein A; IgY; Mammalian IgG; Specificity
Categories
Funding
- National Natural Science Foundation of China [81702099, 31570096]
- Natural Science Foundation of Henan Province [182300410327]
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To develop a specific method for the detection of S. aureus, chicken anti-protein A IgY was adopted for specifically capturing S. aureus, depending on the specific recognition of staphylococcal protein A (SPA) by chicken anti-protein A IgY, which can eliminate the interference from protein G-producing Streptococcus. HRP labeled IgG, Fc region of which has a high affinity towards SPA, was paired with IgY for the colorimeter analysis of the system. By optimizing the system, a super-low detection limit of 11 CFU of S. aureus in 100 mu L PBS without enrichment, with a linear range from 5.0 x 10(2) CFU mL(-)(1) to 5.0 x 10(4) CFU mL(-1) was obtained. The entire assay was accomplished in less than 90 min and no cross-reactivity with the other tested bacterial species was observed. Moreover, the developed assay has been applied for the detection of S. aureus in three different types of real samples (sodium chloride injection, apple juice and human urine) with satisfactory results. To the best of our knowledge, it is the first time to report using chicken anti-protein A IgY and any IgG to detect S. aureus based on the dual-recognition mode of SPA. The novel method opened up a way for monitoring S. aureus in food samples with high sensitivity, specificity and simple operation.
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