All analysis were performed in reversed-phase HPLC Zorbax SB-C18 column (150 mm x 2.0 mm x 3.0 um, Agilent technologies, Santa Clara, USA) for optimizing the separation conditions. The mobile phases w
We employed a cyanopropylsilane column Zorbax SB-CN (150 x 3.0 mm x 3.5 um, Agilent technologies, Santa Clara, USA) for optimizing the separation conditions. We use two gradient methods, one of 30 min
