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Multiplexed detection and differentiation of bacterial enzymes and bacteria by color-encoded sensor hydrogels.

Authors
  • Jia, Zhiyuan1
  • Müller, Mareike1
  • Le Gall, Tony2
  • Riool, Martijn3
  • Müller, Max1
  • Zaat, Sebastian A J3
  • Montier, Tristan2, 4
  • Schönherr, Holger1
  • 1 Physical Chemistry I & Research Center of Micro and Nanochemistry and Engineering (), Department of Chemistry and Biology, University of Siegen, Adolf-Reichwein-Straße 2, 57076, Siegen, Germany. , (Germany)
  • 2 Univ Brest, INSERM, EFS, UMR 1078 GGFB, F-29200, Brest, France. , (France)
  • 3 Department of Medical Microbiology and Infection Prevention, Amsterdam institute for Infection and Immunity, Amsterdam UMC, University of Amsterdam, Meibergdreef 9, 1105, AZ, Amsterdam, the Netherlands. , (Netherlands)
  • 4 CHRU de Brest, Service de génétique médicale et de biologie de la reproduction, Centre de Référence des Maladies Rares « Maladies neuromusculaires », F-29200, Brest, France. , (France)
Type
Published Article
Journal
Bioactive Materials
Publisher
KeAi Publishing
Publication Date
Dec 01, 2021
Volume
6
Issue
12
Pages
4286–4300
Identifiers
DOI: 10.1016/j.bioactmat.2021.04.022
PMID: 33997506
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

We report on the fabrication and characterization of color-encoded chitosan hydrogels for the rapid, sensitive and specific detection of bacterial enzymes as well as the selective detection of a set of tested bacteria through characteristic enzyme reactions. These patterned sensor hydrogels are functionalized with three different colorimetric enzyme substrates affording the multiplexed detection and differentiation of α-glucosidase, β-galactosidase and β-glucuronidase. The limits of detection of the hydrogels for an observation time of 60 min using a conventional microplate reader correspond to concentrations of 0.2, 3.4 and 4.5 nM of these enzymes, respectively. Based on their different enzyme expression patterns, Staphylococcus aureus strain RN4220, methicillin-resistant S. aureus (MRSA) strain N315, both producing α-glucosidase, but not β-glucuronidase and β-galactosidase, Escherichia coli strain DH5α, producing β-glucuronidase and α-glucosidase, but not β-galactosidase, and the enterohemorrhagic E. coli (EHEC) strain E32511, producing β-galactosidase, but none of the other two enzymes, can be reliably and rapidly distinguished from each other. These results confirm the applicability of enzyme sensing hydrogels for the detection and discrimination of specific enzymes to facilitate differentiation of bacterial strains. Patterned hydrogels thus possess the potential to be further refined as detection units of a multiplexed format to identify certain bacteria for future application in point-of-care microbiological diagnostics in food safety and medical settings. © 2021 The Authors.

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