The quadloop: a novel device for plating and streaking microbial samples

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A novel disposable plastic device which facilitates microbial sampling and dilution streaking procedures is described. The basic features of the device are (i) a sphere of ca. 4 mm diameter, on which the microbial sample is taken up, which is attached to (ii) a square handle which enables the device to be held in four distinct positions. The microbial sample is taken up on one quadrant of the sphere and plated. Subsequent 90° turns of the device are then used to dilute the inoculum on the agar plate for colony isolation, thus eliminating the need to employ several disposable loops for a single sampling and streaking procedure. The device can be used to sample colonies, liquids and solid surfaces.

Original languageEnglish
Pages (from-to)283-287
Number of pages5
JournalJournal of Microbiological Methods
Issue number5-6
StatePublished - Sep 1986


  • Colony isolation
  • Dilution
  • Inoculation
  • Loop
  • Sampling
  • Streaking


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