Tag Archives: E. Coli 0157:H7

Nanoparticle-Based LFIA for Rapid Detection of E. Coli O157:H7

By Food Safety Tech Staff
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Researchers have developed a dual-readout aggregation-induced emission nanoparticle-based lateral flow immunoassay (LFIA) for rapid qualitative and quantitative detection of E. coli O157:H7 in food.

For the study, published in ACS Nano (November 27, 2023), Gan Zhang, et al, designed an aggregation-induced emission luminogen—2,3-Bis(4-(bis(4-(tert-butyl)phenyl)amino)phenyl)fumaronitrile (BAPF). They then integrated the BAPFs into a nanostructured system to form water-soluble nanoparticles (BAPFNPs) for the detection of E. coli O157:H7 with colorimetric and fluorescent readout.

The BAPFNPs-based LFIA (BAPFNPs-LFIA) exhibited nearly qualitative ability with gold nanoparticles-LFIA (AuNPs-LFIA) and a nine times enhancement compared with quantum beads-LFIA (QBs-LFIA) in quantitative testing. Of note, FL-BAPFNPs-LFIA was able detect E. coli O157:H7 earlier than QBs-LFIA and AuNPs-LFIA when samples with low E. coli O157:H7 concentrations were cultured.

Tanimura & Antle romaine lettuce

Romaine Lettuce Recall Due to Possible E. Coli Contamination

By Food Safety Tech Staff
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Tanimura & Antle romaine lettuce
Tanimura & Antle romaine lettuce
Tanimura & Antle issued a voluntary recall of single-head packaged romaine lettuce.

Tanimura & Antle, Inc. is voluntarily recalling its packaged single head romaine lettuce, out of an abundance of caution, due to possible E. Coli 0157:H7 contamination. The product has a packaged date of 10/15/2020 or 10/16/2020, and the UPC number 0-27918-20314-9.

Although no illnesses have been reported, the recall is based on the test result of a random sample taken and analyzed by the Michigan Department of Agriculture and Rural Development. The company distributed 3,396 cartons to 20 states. Retailers and distributors can identify the affected products using the Product Traceability Initiative stickers (571280289SRS1 and 571280290SRS1) that are attached to the exterior of the case.