spectrofluorimetric measurement of olive oil was conducted using a Cary Eclipse (Varian Ibérica, Madrid, Spain). This instrument was equipped with a continuous xenon lamp, excitation and emission monochromators, and a photomultiplier to 800 V. Poly(methyl methacrylate) disposable cells (10 × 10 mm, 4.5 mL, Deltalab, Barcelona, Spain) were used for right-angle fluorometry.