Wound healing occurs by a series of interrelated molecular events which work together to restore tissue integrity and cellular function. These physiological events occur smoothly in normal healthy individual and/or under normal conditions. However, in certain cases, these molecular events are retarded resulting in hard-to-heal or chronic wounds arising from several factors such as poor venous return, underlying physiological or metabolic conditions such as diabetes as well as external factors such as poor nutrition. In most cases, such wounds are infected and infection also presents as another complicating phenomenon which triggers inlammatory reactions, therefore delaying wound healing. There has therefore been recent interests and signiicant eforts in preventing and actively treating wound infections by directly targeting infection causative agents through direct application of antimicrobial agents either alone or loaded into dressings (medicated). These have the advantage of overcoming challenges such as poor circulation in diabetic and leg ulcers when administered systemically and also require lower amounts to be applied compared to that required via oral or iv administration. This chapter will review and evaluate various antimicrobial agents used to target infected wounds, the means of delivery, and current state of the art, including commercially available dressings. Data sources will include mainly peer-reviewed literature, clinical trials and reports, patents as well as government reports where available.
Formation of stable nanoemulsions by ultrasound-assisted two-step emulsification process for topical drug delivery: effect of oil phase composition and surfactant concentration and loratadine as ripening inhibitor,
Aim: To prepare loratadine-loaded solid lipid nanoparticles (SLNs) using a modified two-step ultrasound-assisted phase inversion temperature (PIT) process. Results/methodology: Loratadine was dissolved in beeswax and Tween 80 was dissolved in water. The two phases were mixed together to prepare a water-in-oil emulsion preconcentrate (w/o) at a PIT of 85°C, followed by gradual water addition at 25°C to trigger nanoparticles formation (o/w). Kinetic stability was investigated. No change in the size was observed within 6 months. Fourier-transform infrared spectroscopy demonstrated stability of the emulsions via molecular structure of water at the interface of the o/w nanoemulsions. SLNs enhanced the in vitro skin permeation of loratadine. Conclusion: Stable SLNs were successfully prepared by ultrasound-assisted PIT.
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