Application of 13C CPMAS NMR for Qualitative and Quantitative Characterization of Carvedilol and its Commercial Formulations
13C cross-polarization magic-angle spinning nuclear magnetic resonance (CPMAS NMR) spectroscopy was applied to the identification and characterization of carvedilol (1-(9H-carbazol-4-yloxy)-3-[2-(2-methoxyphenoxy)-ethylamino]-propan-2-ol) in pharmaceutical preparations. Solid-state spectra (standard...
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Published in | Journal of pharmaceutical sciences Vol. 101; no. 5; pp. 1763 - 1772 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Hoboken
Elsevier Inc
01.05.2012
Wiley Subscription Services, Inc., A Wiley Company Wiley American Pharmaceutical Association Elsevier Limited |
Subjects | |
Online Access | Get full text |
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Summary: | 13C cross-polarization magic-angle spinning nuclear magnetic resonance (CPMAS NMR) spectroscopy was applied to the identification and characterization of carvedilol (1-(9H-carbazol-4-yloxy)-3-[2-(2-methoxyphenoxy)-ethylamino]-propan-2-ol) in pharmaceutical preparations. Solid-state spectra (standard linewidth and lack of signal multiplicity) of carvedilol indicate that its physical form is the same (freebase form II); no other polymorphic forms were detected. The spectra of excipients, recorded under the same conditions, were helpful in their identification. The differences in chemical shifts for tablets I–VI are insignificant and suggest that there are no strong intermolecular drug–excipient interactions. The drugs from six manufacturers contained the same amount (25mg) of the active substance per tablet; however, tablets differ in size and thus in the concentration of carvedilol. An attempt at quantitation of carvedilol in the dosage forms was made. The cross-polarization kinetics and other measurement parameters affecting the intensity and reproducibility of the spectra were determined. The results revealed a satisfying relationship between the composition of the tablets and the intensity of selected NMR signals. The 13C CPMAS NMR technique was found to provide accurate quantification of drugs without any chemical preparation, as shown by the particular case of carvedilol's solid formulations. |
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Bibliography: | istex:6C292D1AB19B3158F0B473BA776A77A597EA5FEB ArticleID:JPS23062 ark:/67375/WNG-84M25BSN-J ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0022-3549 1520-6017 |
DOI: | 10.1002/jps.23062 |