Rapid quantification of two chemical nerve agent metabolites in serum

Details

• Alternative Title:
  Biosens Bioelectron
• Personal Author:
  Kammer, Michael ; Kussrow, Amanda ; Carter, Melissa D. ; Isenberg, Samantha L. ; Johnson, Rudolph C. ; Batchelor, Robert H. ; Jackson, George W. ; Bornhop, Darryl J.
• Description:
  Organophosphorus compounds (OPs) continue to represent a significant chemical threat to humans due to exposures from their use as weapons, their potential storage hazards, and from their continued use agriculturally. Existing methods for detection include ELISA and mass spectrometry. The new approach presented here provides an innovative first step toward a portable OP quantification method that surmounts conventional limitations involving sensitivity, selectivity, complexity, and portability. DNA affinity probes, or aptamers, represent an emerging technology that, when combined with a mix-and-read, free-solution assay (FSA) and a compensated interferometer (CI) can provide a novel alternative to existing OP nerve agent (OPNA) quantification methods. Here it is shown that FSA can be used to rapidly screen prospective aptamers in the biological matrix of interest, allowing the identification of a 'best-in-class' probe. It is also shown that combining aptamers with FSA-CI enables quantification of the OPNA metabolites, Sarin (NATO designation "G-series, B", or GB) and Venomous Agent X (VX) acids, rapidly with high selectivity at detection limits of sub-10 pg/mL in 25% serum (by volume in PBS). These results suggest there is potential to directly impact diagnostic specificity and sensitivity of emergency response testing methods by both simplifying sample preparation procedures and making a benchtop reader available for OPNA metabolite quantification.
• Subjects:
  Amines Article Biosensing Techniques Chemical Warfare Agents Chromatography, Liquid Environmental Exposure Enzyme-Linked Immunosorbent Assay Humans Limit Of Detection Nerve Agents Organophosphorus Compounds Organothiophosphorus Compounds Sarin Tandem Mass Spectrometry

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• Source:
  Biosens Bioelectron. 131:119-127
• Pubmed ID:
  30826646
• Pubmed Central ID:
  PMC6457360
• Document Type:
  Journal Article
• Funding:
  CC999999/Intramural CDC HHS/United States
• Volume:
  131
• Collection(s):
  CDC Public Access
• Main Document Checksum:
  urn:sha256:82a353368b18303492f599eeaf0e22589fe68f67f5b7235d3dd3b4bc2a815fb5
• Download URL:
  https://stacks.cdc.gov/view/cdc/77502/cdc_77502_DS1.pdf
• File Type:
  [PDF - 360.62 KB ]