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Laruyl Tryptose BrothLaruyl tryptose broth (LSB) is a selective medium for coliforms. The American Public Health Association (APHA) recommends that lauryl tryptose broth should be used for the Mean Probable Number Presumptive Test of coliforms in waters, effluent or sewage as a confirmatory test of lactose fermentation with gas production for milk samples. Formula in gm/litre Tryptose: 20.0, Lactose : 5.0, Sodium chloride : 5.0, Dipotassium hydrogen phosphate : 2.75, Potassium dihydrogen phosphate : 2.75, Sodium lauryl sulphate : 0.1 pH 6.8 0.2 External link
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