... 200220 lL of the enzyme/inhibitor mixture to 180 lLofsubstrate (4NPGlc), incubating for 30 min at 37 °C, andmeasuring the rel ease of 4NP.Protein assays and protein sequencingTotal protein in crude ... rate of 1 mLámin)1 .The following gradients were used: incubations containingarbutin or salicin as substrate; 100% C initial, i ncreasingD t o 2 0% (10 min), 50% ( 15 min), 100% (5 min), held ... oleuropein (olives). The fourth general property of enzymes involved in transformation of xenobiotics isincreased enzyme levels in the presence of xenobioticsubstrates, i.e. inducibility. Cloning the...