Development of rapid dipstick assay for food pathogens, Salmonella, by optimized parameters


ÇAM D., ÖKTEM H. A.

JOURNAL OF FOOD SCIENCE AND TECHNOLOGY-MYSORE, vol.56, no.1, pp.140-148, 2019 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 56 Issue: 1
  • Publication Date: 2019
  • Doi Number: 10.1007/s13197-018-3467-5
  • Journal Name: JOURNAL OF FOOD SCIENCE AND TECHNOLOGY-MYSORE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.140-148
  • Keywords: Lateral flow assay, Salmonella, Gold nanoparticles, Whole cell detection, LATERAL FLOW ASSAY, GOLD NANOPARTICLES, IMMUNOCHROMATOGRAPHIC ASSAY, VISUAL DETECTION, TYPHIMURIUM, BIOSENSOR, AMPLIFICATION, ANTIBODIES
  • Middle East Technical University Affiliated: Yes

Abstract

Salmonella is among the very important pathogens threating the human and animal health. Rapid and easy detection of these pathogens is crucial. In this context, antibody (Ab) based lateral flow assays (LFAs) which are simple immunochromatographic point of care test kits were developed by gold nanoparticles (GNPs) as labelling agent for Salmonella detection. For that purpose some critical parameters such as reagent concentrations on the capture zones, conjugate concentrations and ideal membrane type needed for LFAs for whole cell detection were tested for naked eye analysis. Therefore, prepared LFAs were applied to the live and heat inactivated cells when they were used alone or included in different bacterial mixtures. Among the test platforms, membrane 180 (M180) was found as an ideal membrane and 36nm GNPs showed highly good labelling in the developed LFAs. Diluted conjugates and low concentrations of reagents affected the test signal negatively. Salmonella was detected in different bacterial mixtures, selectively in 4-5min. The best recognized species by used Ab were S. enteritidis and S. infantis. 5x10(5)S. typhimurium cells were also determined as a limit of detection of this study with mentioned parameters.