Figure 2.

Chromatograms showing separation of standards of eights bisphenols (top—all eights standards; middle—without BADGE·2H₂O; bottom—without BPS) by HPLC-DAD with application of following chromatographic conditions: the stationary phase Scherzo SM-C18; the mobile phase consisted of 50 mM HCOOH in water (component A, pH = 2.55) and 50 mM HCOOH in MeCN (component B). Gradient elution at 0.4 mL min⁻¹ mobile phase flow was applied. The gradient program was as follows: 0–10 min from 40% eluent B to 100% B; 10–16 min isocratic 100% B.