Keywords: amu, atomic mass units; BPA, bisphenol A; Bis-DMA, bisphenol A dimethacrylate; Bis-EDMA, bisphenol A ethoxylate dimethacrylate; Bis-GMA, bisphenol A diglycidyl methacrylate; d16BPA, deuterated bisphenol A; DAD, diode array detection; ESI, electrospray ion