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A review of bioluminescent ATP techniques in rapid microbiology

Abstract Use of firefly luciferase to assay adenosine triphosphate (ATP) extracted from microorganisms provides an easy means to enumerate microbes within minutes. The small amount of light produced is proportional to ATP and thus microbial number. The average bacterium contains around 10−15 g ATP per cell. Present reagents permit detection of 103 cells per tube. Luminometers currently on the market detect about 10−12 g ATP. Proper extraction of ATP from the microbes is an essential part of any protocol, as is the removal of non‐microbial ATP from, for example, somatic cells also present in samples. The technique may be applied to a wide range of samples, for example food and beverages and clinical samples such as urine. The ATP assay gives a global measure of microbial numbers, i.e. it is not species specific unless a species separation step is included in the protocol.

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