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Int J Biol Macromol. 2015 Aug;79:63-71. doi: 10.1016/j.ijbiomac.2015.04.048. Epub 2015 Apr 30.

Composite alginate and gelatin based bio-polymeric wafers containing silver sulfadiazine for wound healing.

Author information

1
Department of Pharmaceutical, Chemical & Environmental Sciences, Faculty of Engineering and Science, University of Greenwich at Medway, Central Avenue, Chatham Maritime, ME4 4TB Kent, UK. Electronic address: joshboat40@gmail.com.
2
Department of Pharmaceutical, Chemical & Environmental Sciences, Faculty of Engineering and Science, University of Greenwich at Medway, Central Avenue, Chatham Maritime, ME4 4TB Kent, UK.

Abstract

Lyophilized wafers comprising sodium alginate (SA) and gelatin (GE) (0/100, 75/25, 50/50, 25/75, 0/100 SA/GE, respectively) with silver sulfadiazine (SSD, 0.1% w/w) have been developed for potential application on infected chronic wounds. Polymer-drug interactions and physical form were characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD), respectively, while morphological structure was examined using scanning electron microscopy (SEM). Functional characteristics [(mechanical hardness and adhesion using texture analyzer, and swelling capacity)] of blank wafers were determined in order to select the optimal formulations for drug loading. Finally, the in vitro drug dissolution properties of two selected drug loaded wafers were investigated. There was an increase in hardness and a decrease in mucoadhesion with increasing GE content. FTIR showed hydrogen bonding and electrostatic interaction between carboxyl of SA and amide of GE but no interaction between the polymers and drug was observed, with XRD showing that SSD remained crystalline during gel formulation and freeze-drying. The results suggest that 75/25 SA/GE formulations are the ideal formulations due to their uniformity and optimal mucoadhesivity and hydration. The drug loaded wafers showed controlled release of SSD over a 7h period which is expected to reduce bacterial load within infected wounds.

KEYWORDS:

Bio-polymeric; Wafers; Wound healing

PMID:
25936500
DOI:
10.1016/j.ijbiomac.2015.04.048
[Indexed for MEDLINE]

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