Imperial/Infector Detector/Specification


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Infector Detector: Specifications

The system must be able to detect the presence of biofilms on urinary catheters by detection of AHL, at a minimum concentration of 5nM, and report with a visual signal within 3 hours. It must work within a temperature range of 20°-30°C, be portable and easy to use, have a shelf life of at least seven days, and must not be harmful or infectious.

System must be sensitive to AHL concentration between 5-50nM
System must give a visual signal if bacteria is present
Response Time
System needs to have a response time under 3 hour
Operating Conditions
System must operate within temperature 20-30°C
Health & Safety
System Must not be living replicating bacteria, and in any way harmful or infectious.
System must have a shelf life of 7 days
System must be portable and convenient to use

Specifications in detail

Desired response of Infector Detector. Note that the response is not necessarily linear.
  • Input: AHL 5-50nM

It is known that, in Pseudomonas aeruginosa biofilms, the concentration of AHL is at least 5nM. (1) Therefore, if the system can successfully report the presence of this concentration, it should be able to detect such biofilms.

  • Output: Visible fluorescent protein
  • Response Time: < 3 hours
  • Operating conditions: Temperatures from 20° to 30°C
  • Health & safety: Non-living, non-infectious
  • Packaging and shelf-life of 7 days


  1. Charlton, TS, et al. A novel and sensitive method for the quantification of N-3-oxoacyl homoserine lactones using gas chromatography–mass spectrometry: application to a model bacterial biofilm. Environmental Microbiology 2 (5), 530–541. October 2000.