Figure 6: LC chromatograms obtained from ethanol extracts of PS sterilized with ozone gas and PC. The detection wavelength was 215 nm. The peaks at tR 18.01, 17.28, and 11.08 min are those of bisphenol A, 4-chloro-4'-hydroxydiphenyl sulfone, and 4,4'-dihydroxydiphenyl sulfone (bisphenol S), respectively. The samples, from top to bottom, are PS from Millipore, PS from Sartorius, PS from Nihon Pall, and PC from Millipore.