Keywords: Lipase activity; Rhodamine B; Olive oil; FluorescencepNP-ester, para-nitrophenyl ester; RhB, rhodamine B; UV, ultraviolet; p-NPC18, p-nitrophenyl stearate; p-NP, p-nitrophenol; LipAT, lipase from Aneurinibacillus thermoaerophilus; EstGtA2, carboxylesteras