Figure 1: Analysis by electrophoresis of the purification of β-galactosidase from Pectinex Ultra SP. (A): SDS-PAGE studies: Lane 1: Low molecular weight marker, Lane 2: Crude extract from PECTINEX ULTRA; Lane 3: Purified enzyme by adsorption/desorption on polyethyleneimine support. (B): Non denaturising electrophoresis of the enzyme. Lane 1: Molecular weight markers; Lane 2: Purified enzyme stained with X-Gal and Coomassie brilliant blue R-250.