Đang chuẩn bị liên kết để tải về tài liệu:
Simultaneous determination of azithromycin and levofloxacin in pharmaceuticals by charge transfer complexation with alizarin red S using an absorption-factor

A new approach based on a selective charge transfer reaction with alizarin red S is described for the simultaneous determination of azithromycin and levofloxacin in their binary mixtures using an absorption-factor spectrophotometric method. Native absorbance was used for the determination for levofloxacin, while a charge transfer complexation of alizarin red S served as the basis for the quantitation of azithromycin. The reaction of azithromycin with alizarin red S was possible in methanol under neutral conditions within 15 min at 25◦C. The conditions were suitably optimized for selective complexation of azithromycin with minimal interference from levofloxacin. | Turkish Journal of Chemistry Turk J Chem 2018 42 36 49 http journals.tubitak.gov.tr chem ITAK c TUB Research Article doi 10.3906 kim-1703-79 Simultaneous determination of azithromycin and levofloxacin in pharmaceuticals by charge transfer complexation with alizarin red S using an absorption-factor method Vijay D. CHAVADA1 Nejal M. BHATT1 Mallika SANYAL2 Pranav S. SHRIVASTAV1 1 Department of Chemistry School of Sciences Gujarat University Ahmedabad Gujarat India 2 Department of Chemistry St. Xavier s College Navrangpura Ahmedabad Gujarat India Received 29.03.2017 Accepted Published Online 21.07.2017 Final Version 08.02.2018 Abstract A new approach based on a selective charge transfer reaction with alizarin red S is described for the simulta- neous determination of azithromycin and levofloxacin in their binary mixtures using an absorption-factor spectrophoto- metric method. Native absorbance was used for the determination for levofloxacin while a charge transfer complexation of alizarin red S served as the basis for the quantitation of azithromycin. The reaction of azithromycin with alizarin red S was possible in methanol under neutral conditions within 15 min at 25 C. The conditions were suitably optimized for selective complexation of azithromycin with minimal interference from levofloxacin. The calibration curve was lin- ear over the concentration range of 4.0 20 µ g mL 1 for azithromycin and levofloxacin and the correlation coefficients of the regression equations were consistently greater than 0.9970 for both the drugs. The limit of detection was 1.07 µ g mL 1 for azithromycin and 0.84 µ g mL 1 for levofloxacin. The developed method was highly reproducible with precision RSD values in the range of 0.54 0.95 for both the drugs. The method was successfully applied for the simultaneous determination of these antibacterial drugs from their synthetic mixtures and pharmaceutical formulations with no interference from excipients. Key words Absorption-factor method .