■疤痕是在深度伤口或烧伤后发生的不愉快的皮肤病变。局部应用曲安奈德是治疗和预防瘢痕的常用方法,在常规剂型中应该重复几次。这里已经努力通过微针技术提供延长的曲安奈德真皮递送。也可用于伤口闭合。
■这项研究旨在开发一种持久的聚乳酸(PLA)微针贴片,用于曲安奈德(TrA)的长期释放,可用于伤口边缘的闭合和疤痕的预防和治疗。
■在这项研究中,使用微模塑-溶剂浇铸方法制造含3%和10%TrA的聚合物微针。光学显微镜,X射线衍射分析(XRD),傅里叶变换红外光谱(FT-IR),和差示扫描量热法(DSC)用于微针的表征。使用压缩试验和亚甲蓝染色评价机械强度。此外,通过人皮肤样品的组织病理学切片以及插入作为皮肤模型的Parafilm®M中确定插入深度。在34天内研究了微针的体外药物释放曲线,并确定了动力学模型。使用Franz扩散池研究TrA的离体皮肤渗透。
■制造的含TrA的PLA微针具有均匀的结构,没有任何故障,恶化,或失去针头。傅里叶变换红外光谱和差示扫描量热法显示TrA和PLA之间没有相互作用,并且未检测到TrA对聚合物的结晶度和热行为的影响。微针表现出适当的机械性能,它们能够穿透到大约900-1000μm的深度。适合Higuchi模型的10%和3%微针的全身释放曲线,在34天内累积量为625µg和201.64µg。从针释放遵循零级动力学,累积量为30.04µg和20.36µg,分别为10%和3%,分别,34天计算出含有10%TrA的微针的渗透为17μg/天。
■结果表明,可以用溶剂流延法成功构建含有具有延长释放行为的TrA的合适PLA微针。
UNASSIGNED: Scar is an unpleasant skin lesion that occurs following deep wounds or burns. The application of local triamcinolone is a common treatment for scar treatment and prevention, which should be repeated several times in conventional dosage forms. An effort has been made here to provide a prolonged triamcinolone dermal delivery by
microneedle technology, which can also be used for wound closure.
UNASSIGNED: This study aimed to develop a long-lasting polylactic acid (PLA)
microneedle patch for the prolonged release of triamcinolone acetonide (TrA) that could potentially be used for closure of wound edges and scar prevention and treatment.
UNASSIGNED: In this study, 3% and 10% TrA-containing polymeric microneedles were fabricated using the micro molding-solvent casting method. Optical microscopy, X-ray diffraction analysis (XRD), Fourier-transform infrared spectroscopy (FT-IR), and differential scanning calorimetry (DSC) were used for the characterization of microneedles. Mechanical strength was evaluated using a compression test and methylene blue staining. Additionally, the insertion depth was determined by histopathological sectioning of human skin samples and also insertion into Parafilm®M as a skin model. The in vitro drug release profile of the microneedles was studied over 34 days, and the kinetic model was determined. The ex-vivo skin permeation of TrA was studied using a Franz-diffusion cell.
UNASSIGNED: The TrA-containing PLA microneedles were fabricated with a uniform structure without any failure, deterioration, or loss of needles. Fourier-transform infrared spectroscopy and differential scanning calorimetry showed no interaction between TrA and PLA, and no effect on crystallinity and thermal behavior of TrA on polymer was detected. Microneedles showed appropriate mechanical properties, which were able to penetrate to about 900 - 1000 μm depth. Release profile from the whole body of 10% and 3%
microneedle fitted to Higuchi model with cumulative amounts of 625 µg and 201.64 µg over 34 days. Release from the needles followed zero-order kinetic with cumulative amounts of 30.04 µg and 20.36 µg for 10% and 3%, respectively, for 34 days. Permeation was calculated to be 17 µg/day for 10% TrA-containing
microneedle.
UNASSIGNED: The results suggested that suitable PLA microneedles containing TrA with prolonged release behavior can be successfully constructed with the solvent casting method.