MILK PROTEINS 157 八 ELUTION VOLUME (ml igure 4.5( Continued The caseins may be quantified by densitometrically scanning pol acrylamide gel electrophoretograms(section 4.4.1) but more quantitative results are obtained by ion-exchange chromatography using urea-containing buffers.However, it should be realized that the specific absorbance of the individual caseins differs greatly(Table 4.2)- v Q Absorbance 280 nrn 0 ? 2 R e ABSORBANCE 280nm h 0 v P 0 0 d