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  Global Journal of Analytical Chemistry 2012, 3: 4
  Research Article
Rapid determination of isoniazid in human plasma by HPLC-UV and its application to a bioequivalence study
  Chinmoy Ghosh, Anita Upadhyay, Sachin Kasodekar, Vikas Gupta, Kinjal Sanghvi, Kumkum Bhattacharya, Bhaswat Chakraborty  
Bio-analytical Department, Research & Development, Cadila Pharmaceuticals Limited, 1389-Trasad Road, Dholka – 387 810, Ahmedabad, Gujarat, India
  A rapid and highly sensitive method for the determination of isoniazid (INH) in human plasma using HPLC-UV was developed and validated. INH was extracted from human plasma by a simple single step derivatization along with protein precipitation extraction technique. An extraction recovery was found to be 100%. Chromatographic separation was carried out on a Hypersil BDS C8 column (250 mm × 4.6 mm, 5 µm) with an isocratic mobile phase of buffer: acetonitrile (50:50, v/v) and a total run time of 6.0 min. The standard calibration curves showed excellent linearity within the range of 0.05–17.96 µg/mL (r = 0.990). The method showed excellent inter and intra day precision and accuracy. This method was successfully applied to a pharmacokinetic study after oral administration of isoniazid tablet to healthy male Indian volunteers. This method can also be applied for routine quality control sample analysis with high throughput.
  Isoniazid; HPLC-UV; Bioequivalance; Method validation; Extraction; Human plasma  

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