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A plate assay to detect bacterial lipase (EC 3.1.1.3) in a medium containing trioleoylglycerol and the fluorescent dye rhodamine B is presented. Substrate hydrolysis causes the formation of orange fluorescent halos around bacterial colonies visible upon UV irradiation. The logarithm of lipase activity from cell-free culture supernatants is linearly correlated with the diameter of halos, thereby allowing quantitation of lipase activities ranging from 1 to 30 nkat.
Kouker et al. (Thu,) studied this question.