HPLC analyses were performed using a Waters 1525 pump (Waters, Milford, MA) equipped with a Waters 717 plus autosampler coupled with a Waters 2478 dual k absorbance detector at 280 and 254 nm according to an established protocol (Zhao et al.,2006).
HPLC analyses were performed using a Waters 1525 pump (Waters, Milford, MA) equipped with a Waters 717 plus autosampler coupled with a Waters 2478 dual k absorbance detector at 280 and 254 nm according to an established protocol (Zhao et al.,2006).