Chromatographic analysis was carried out in a Jasco highperformance
liquid chromatographic system equipped with a
diode array detector (model MD-2010), a fluorescence detector
(model FP-2020), an HPLC pump module (model PU-2089), a column
oven module (model CO-2060) and an auto-sampler module
(AS-2050), and controlled by Chrompass version 1.8 software