Liquid chromatographic methods in the determination of inosine monophosphate dehydrogenase enzyme activity: a review: Supplementary files

Inosine monophosphate dehydrogenase (IMPDH) is a crucial enzyme involved in the de novo synthesis

of purine nucleotides. IMPDH activity is used to evaluate the pharmacodynamics/pharmacokinetics of

immunosuppressant drugs such as mycophenolic acid and thiopurines. These drugs are often used to

prevent organ transplant rejection and as steroid-sparing agents in autoinflammatory diseases such

as inflammatory bowel disease and rheumatoid arthritis. Numerous analytical techniques have been

employed to evaluate IMPDH activity in biological matrices. However, hyphenated LC techniques were

most widely used in the literature. This review focuses on hyphenated LC methods used to measure

IMPDH activity and provides detailed insight into the sample preparation techniques, chromatographic

conditions, enzymatic assay conditions, detectors and normalization factors employed in those methods.