High performance liquid chromatographic determination of isoniazid, pyrazinamide and rifampicin in pharmaceutical preparations.

lsoniazid (IS) individually or in the presence of pyrazinamide and rifampicin has been determined by high performance liquid chromatography (HPLC) after derivatization with 6-methyl-2-pyridinecarboxaldehyde. Pyrazinamide and rifampicin separate completely from isoniazid derivative and are determined simultaneously. The chromatography is carried out from YMC-ODS column with elution with methanol: water: isopropanol: acetonitrile: sodium acetate (1 mM) 51:42:3:2:2: v/v/v/v/v/) with flow rate 1.7 ml/min and UV detection at 333 nm. The method is applied for the analysis of Isoniazid B.P Rambuzid and Myrene-p tablets.