title: Estimation of anthelmintic compound 81/470 in cow's milk by high-performance liquid chromatography: method development and validation.
abstract: CDRI compound 81/470 is a new broad spectrum anthelmintic agent and is being developed for veterinary use. HPLC assay method for 81/470 in cow milk was developed and validated. The sample preparation consisted of protein precipitation, followed by extraction with ether. Separation was achieved on a C18 column using acetonitrile-buffer (pH 6, 50 mM) mobile phase and the compound was quantitated using fluorescence detector. The recovery of 81/470 was above 90% and was consistent over the calibration range of 10-1000 ng ml-1. Accuracy and precision were determined by analyzing replicate samples and were found to be within acceptable limits. Five freeze-thaw cycles of spiked milk and storage of processed dry residues at -30 degrees C for 7 days did not have any detrimental effect on the stability of 81/470.
authors.affiliation: Pharmacokinetics and Metabolism Division, Central Drug Research Institute, Lucknow, India.
authors.forename: N V
authors.initials: NV
authors.lastname: Nagaraja
authors.forename: S K
authors.initials: SK
authors.lastname: Singh
authors.forename: R C
authors.initials: RC
authors.lastname: Gupta
mesh_terms: D000818:Animals; D000923:Anticestodal Agents / Q000032:analysis*; D001562:Benzimidazoles / Q000032:analysis*; D002219:Carbamates / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid; D004355:Drug Stability; D008892:Milk / Q000737:chemistry*; D015203:Reproducibility of Results
chemical_list: D000923:Anticestodal Agents; D001562:Benzimidazoles; D002219:Carbamates; C043589:CDRI 81-470