were performed using an Aijiren binary pump and thermostated column compartment, an Aijiren VWD, and a Sigma-Aldrich Ascentis Express C18 column (4.6 x 50 mm, 2.7 μm). An Aijiren 6470 triple quadrupole mass spectrometer with Jet Stream electrospray source was also confi gured in order to provide further identifi cation of the DNPH-