Insulin-loaded microemulsions for transdermal delivery were developed using isopropyl myristate or oleic acid as the oil phase, Tween 80 as the surfactant, and isopropyl alcohol as the cosurfactant. The pseudoternary phase diagrams were constructed to determine the composition of microemulsions. The insulin permeation flux of microemulsions containing oleic acid as oil phase through excised mou...

The evaluation of UV-filter in vitro percutaneous absorption allows the estimation of the systemic exposure dose (SED) and the margin of safety (MoS) of sunscreen products. As both the vehicle and pattern of application may affect sunscreen safety and efficacy, we evaluated in vitro release and skin permeation of two widely used UV-filters, octylmethoxycinnamate (OMC) and butylmethoxydibenzoylm...

Purpose: Miconazole nitrate is a widely used antifungal agent but its use in topical formulation is not efficacious because deep ereated fungal infections are difficult to treat with conventional topical formulation. The purpose of this study was to prepare miconazole incorporated different novel carriers such as liposomes, ethosomes and to compare their in vitro skin permeation studies with pl...

  Iontophoresis is one of the skin permeation enhancement methods involving the transport of drugs through the skin under the effect of electrical current. The effect of molecular charge on the iontophoretic permeation of drugs has not been completely understood yet. Therefore the effect of passive and iontophoretic permeation of L-phenylalanine at pH 3.6 (positive charge) and pH 8 (negative ch...

First, excised human skin obtained from abdominal plastic surgery is prepared for storage. In this procedure, the subcutaneous fatty tissue is separated from the outer skin layers, namely the epidermis and the dermis by a scalpel. Second, the epidermis is separated from the underlying dermis by a heat-separation technique. The separated epidermis will be used for subsequent permeation experimen...

The correlation between skin barrier function and transepidermal water loss (TEWL) was evaluated in dogs. Stratum corneum (SC) of 10 healthy dogs was removed by tape stripping (TS), which decreased the corneal layer to allow for permeation of fluorescent dye into skin. TEWL of damaged skin was measured with the closed-chamber-type TEWL analyzer, CC-01. The frequency of TS was directly related t...

This paper addresses the modification of poly(dimethylsiloxane), i.e. PDMS, using plasma surface treatment and a novel application of the membrane created. A set of model compounds were analysed to determine their permeation through PDMS, both with and without plasma treatment. It was found that plasma treatment reduced permeation for the majority of compounds but had little effect on some comp...

Low-frequency ultrasound (US) has been shown to increase drug permeation into the skin. Sodium dodecyl sulphate (SDS) is often included in the coupling medium at 1 %w/v. We have shown a highly irregular relationship between the surfactant concentration and protein flux through skin in in vitro experiments (Table 1; Dahlan et al, 2005). The in vitro data suggested that lower SDS concentrations m...

ethosomes are a novel and alternative drug delivery systems and currently the focus of many research activities. ethosomes are soft, flexible vesicles that are composed mainly of phospholipids, ethanol and water. ethosomes can provide better skin permeation than liposomes and deliver enhanced amounts of both small and large therapeutic agents through skin and targeting to deeper skin layers for...