(40 mM, pH 7.8; Scharlau, Scharlab S.L., Barcelona, Spain) and acetonitrile/methanol/MiliQ (45:45:10,v/v/v; Fisher Chemical, Pittsburgh, NH, USA and Scharlau, Scharlab S.L., Barcelona, Spain) solutions were used as eluents at 40 °C with a flow rate of 1.5 mL/min. The UV ...