TABLE 6

Michaelis-Menten kinetic parameters of metabolite formation from diltiazem and MA in HLMs

Results are parameter estimates (standard error) obtained by SAAM II software assuming one enzyme reaction.




Km

Vmax

Intrinsic Clearancea

Percentage Inhibition by 1 μM Ketoconazole
μM pmol/mg/min μl/mg/min
Diltiazem to MA 54 (5) 1881 (115) 35 94b
MA to MD
19 (8)
385 (1)
20
93c
  • a Calculated as Vmax/Km.

  • b n = 4, 10 μM diltiazem, 18-min reaction.

  • c n = 3, 5 μM MA, 2-min reaction.