2.6.5. Quantitative Analysis

KET quantification was performed using a UV-VIS spectrophotometer (8453 Agilent, Santa Clara, CA, USA). The quantification was made using a calibration curve in phosphate buffer pH 5.50 previously prepared (λmax = 261 nm, r = 0.99), using phosphate buffer pH 5.50 as blank. Experiments were performed in triplicate, and the error expressed as standard deviation (±SD).
