The range includes a variety of different formulations. Letheen Broth, for example, is used to assess the bactericidal activity of preservatives in water-based cosmetics. Letheen Agar enables scientists to determine the number of colony forming units from a hygiene swabbing protocol and, when used with Letheen Broth, potential inaccuracies caused by disinfectant carryover are avoided. Lab M recommends Microbial Content Test Agar (MCTA) for the detection of microorganisms on surfaces sanitised with quaternary ammonium compounds, phenolic compounds and formalin. D/E Neutralising Agar can be used when assessing disinfectants by the disc diffusion method, while D/E Neutralising Broth and D/E Neutralising Broth Base are both suitable for challenge testing of disinfectants. The inclusion of bromocresol purple in D/E Neutralising Broths permits a visual detection of microbial growth through a colour change in the broth.
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