alexa Evaluation of carboxymethyl guar films for the formulation of transdermal therapeutic systems.
Biomedical Sciences

Biomedical Sciences

Biology and Medicine

Author(s): Narasimha Murthy S, Hiremath SR, Paranjothy KL

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Abstract Carboxymethyl guar (CMGS), an anionic semisynthetic guar gum derivative was evaluated for its suitability of use in transdermal drug-delivery systems. Terbutaline sulfate (TS) was used as a model drug. The diffusion of terbutaline sulfate from CMGS solution was relatively slower at pH 5 than at pH 10. It is most likely that the interaction between CMGS and terbutaline sulfate at pH 5 is physical, involving static interaction. The ability of such interactions in modifying the release kinetics of drug from the CMGS transdermal films was studied. The release was exponential from pH 5 formulations whereas the release rate followed zero or Higuchian order from pH 10 formulations. However, the diffusion kinetics of both pH 5 and pH 10 formulations followed zero order across human cadaver epidermis. Such an interaction was also found to alter the pharmacokinetic parameters of the drug. The steady-state concentration of TS was relatively consistent and the bioavailability was approximately 50\% higher in pH 5 formulations than pH 10. The elimination rate constant/half-life was significantly different between pH 5 and pH 10 formulations. This article was published in Int J Pharm and referenced in Biology and Medicine

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