2.3.2. Equipment
The analysis was performed with a LC system consisting of a HP Agilent 1100 series quaternary pump with degasser and a photodiode array detector. Samples were injected with a HP Agilent 1100 Autosamplers with thermostatted column compartment on a ACE-5 C18 column (5_m; 250mm; 4.6mm), at 30◦C. The systemwas controlled and data analysis was performed with Agilent ChemStation. All the calculations concerning the quantitative analysis were performed with external standardization by measurement of peak areas.