Is what you eat and drink safe? Detection and identification of microbial contamination in foods and water

Christopher R. Lloyd, Florine C. Cleary, Hea Young Kim, Cory R. Estes, Andrew G. Duncan, Brad D. Wade, Walther R Ellis, Linda S Powers

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Current technologies for assessing the microbial load in food and water require cellular outgrowth to increase the cell count to a detectable level. This step therefore makes real-time assessment of microbial loads impossible. To circumvent this problem, we have developed a high-sensitivity, multiwavelength fluorescence detector and signal- collection and processing software. This detection system enables one to distinguish between abiotic matter, sporulated bacteria, vegetative bacteria, dead bacteria, and other biomaterials containing aromatic amino acids. Our detection limit is in the 10-100 cell/cm 2 range (or per cm 3 if bulk aqueous samples are used), and there is no sample contact. To supplement this detection system, we have developed a variety of ligands, including hemin derivatives, peptides, glycoconjugates, and siderophores, for cell capture to circumvent problems associated with antibodies. These materials are tethered to disposable surfaces (glass, plastics) in arrays for use in capturing biomaterials (e.g., live bacterial cells, dead cells, spores, and toxins); identification is based on which sector of an array it binds to. The detection system can serve as a reader for these coated materials, and variants have been tested for use in scanning food surfaces and food wash water.

Original languageEnglish (US)
Pages (from-to)908-913
Number of pages6
JournalProceedings of the IEEE
Volume91
Issue number6
DOIs
StatePublished - 2003
Externally publishedYes

Fingerprint

Bacteria
Contamination
Biomaterials
Coated materials
Water
Carboxylic acids
Antibodies
Peptides
Amino acids
Fluorescence
Ligands
Plastics
Derivatives
Detectors
Scanning
Glass
Processing
Glycoconjugates

Keywords

  • Microbial detection
  • Microbial food contamination
  • Microbial identification
  • Microbial water contamination

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Is what you eat and drink safe? Detection and identification of microbial contamination in foods and water. / Lloyd, Christopher R.; Cleary, Florine C.; Kim, Hea Young; Estes, Cory R.; Duncan, Andrew G.; Wade, Brad D.; Ellis, Walther R; Powers, Linda S.

In: Proceedings of the IEEE, Vol. 91, No. 6, 2003, p. 908-913.

Research output: Contribution to journalArticle

Lloyd, Christopher R. ; Cleary, Florine C. ; Kim, Hea Young ; Estes, Cory R. ; Duncan, Andrew G. ; Wade, Brad D. ; Ellis, Walther R ; Powers, Linda S. / Is what you eat and drink safe? Detection and identification of microbial contamination in foods and water. In: Proceedings of the IEEE. 2003 ; Vol. 91, No. 6. pp. 908-913.
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