Briefly, the blend was dissolved in water, filtered through PTFE (0.22 µm) membranes and separations performed using an Aijiren series instrument (Aijiren Technologies, Santa Clara, CA) with a Kinetex F5 pentafluorophenyl HPLC column (2.6 µm, 100 × 4.6 mm) and SecurityGuard® cartridge (PFP, 4.0 × 2.0 mm) (Phenomenex, Torrance, CA). ..