Title:
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Design and characterisation of PVA-borate hydrogels as potential topical drug delivery systems for ulcerated and lacerated lesions
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PVA-Borate hydrogels have potential as delivery vehicles Jorthe treatment of ..
lacerated and ulcerated lesions. Due to their novel dilatantflow properties, they can
flow into cavernous wounds, create intimate contact with the wound bed and be
removed intact once treatment has ceased. Furthermore, due to their high water
content, they have the potential to induce autolytic debridement of dead tissue present
in ulcerated lesions.
Lidocaine HCI was successfully formulated into PVA-borate hydrogels with
the aid of the polyol, D-mannitol. This polyol prevented demixing caused by the
addition of lidocaine HCI to PVA-borate hydrogels, therefore producing a clear and
stable lidocaine HCI formulation for potential topical anaesthesia of lacerated lesions..
Furthermore, lidocaine was found to possess significant stability in thesePVA-borate
fonTIulations, to the extent that no lidocaine HCI degradation was found after 6
. months at room temperature.
For the treatment of infected ulcerated lesions, mupirocin Caand terpinen-4-01
was fonTIulated into PVA-borate hydrogels. Mupirocin Ca was found to have greater·
solubility in PVA-borate hydrogels when compared to deionised water. This increased
solubility ofmupirocin Ca in PVA-borate hydrogels was attributed to the fonnation of
a mupirocin-borate ion complex. Terpinen-4-01 was dispersed in PVA-borate
hydrogels as an emulsion. \\Then the terpinen-4-ol and mupirocin PVA-borate
hydrogels were compared by the use of model wound, mupirocin formulations were
found to have significantly greater antimicrobial activity. However, the stability of
mupirocin in PVA-borate hydrogels was found to be poor, with almost complete
degradation occurring after 6 weeks.
From this study, it is evident that for the treatment of infected ulcerated
lesions, mupirocin Ca loaded PYA-borate hydrogels have greater potential than
terpinen-4-ol loaded gels. Furthermore, lidocaine HCI loaded PYA-borate hydrogels
have been shown ill vitro to be suitable formulations for the induction of anaesthesia
in lacerated lesions.
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