Formulation of Hydrophilic Non-Aqueous Gel: Drug Stability in Different Solvents and Rheological Behavior of Gel Matrices |
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Authors: | Keat Theng Chow Lai Wah Chan Paul W S Heng |
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Institution: | (1) Department of Pharmacy, Faculty of Science, National University of Singapore, 18 Science Drive 4, Singapore, 117543, Singapore;(2) Present address: Division of Pharmaceutics, College of Pharmacy, The University of Texas at Austin, 1 University Station, Mailstop A1920, Austin, Texas, 78712, USA |
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Abstract: | Purpose This study was aimed at formulating a hydrophilic non-aqueous gel for topical delivery of the model moisture-sensitive drug,
minocycline hydrochloride (MH).
Methods Stability study of MH dissolved in water and various hydrophilic non-aqueous solvents was performed over a period of four
months in order to select a suitable non-aqueous solvent for MH gel. To improve MH stability, the effect of different cation
additives on MH stability in the selected solvent was investigated. Non-aqueous gel matrices were prepared from three different
types of hydrophilic polymers in glycerin-propylene glycol mixture with Mg2+ cation additive. Oscillatory shear rheometry was performed on the gel matrices using a cone-and-plate rheometer.
Results MH stability was affected by the type of solvent employed and the duration of storage. Different cation additives affected
the extent of MH stabilization through MH-cation complex formation. Rheological properties of the non-aqueous gel matrices
were significantly affected by the type and concentration of polymer, and the vehicle ratios in the formulations.
Conclusions MH stabilization could be achieved using the selected glycerin-propylene glycol mixture containing MgCl2. Gel matrix formulated using this solvent system and 3%w/w N-vinylacetamide/sodium acrylate copolymer had demonstrated the
most favorable rheological properties as a gel for topical application. |
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Keywords: | minocycline hydrochloride non-aqueous gel rheology stability viscoelastic |
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