期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 63, 期 36, 页码 8068-8074出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.5b02331
关键词
bacteria; sensing; upconversion nanoparticles; fluorescent probe; Escherichia coli
资金
- National Natural Science Foundation of China [31271875]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
Rare earth-doped upconversion nanoparticles (UCNPs) have promising potential in the field of food safety because of their unique frequency upconverting capability and high detection sensitivity. Here, we report a rapid and sensitive UCNP-based bacterium-sensing strategy using Escherichia coli. Highly fluorescent and water-soluble UCNPs were fabricated and conjugated with antibodies against E. coli for use as fluorescent probes. The E. coli were successively captured by the fluorescent probes. After the captured cell samples were pelleted, the differences in the fluorescence intensities between sample supernatants and the control were observed to increase linearly with E. coli concentration from 42 to 42 X 10(6) colony-forming units (cfu)/mL (R-2 = 0.9802), resulting in a relatively low limit of detection of 10 cfu/mL. Furthermore, the ability of the bioassay to detect E. coli was also confirmed in adulterated meat and milk samples.
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