School of Pharmacy, Medical Biology Centre, Queen's University Belfast, 97 Lisburn Road, Belfast, BT9 7BL, UK.
Department of Pharmaceutics, Hamdard Institute of Pharmaceutical Sciences, Hamdard University, Islamabad, Pakistan.
Drug Deliv Transl Res. 2022 Apr;12(4):881-896. doi: 10.1007/s13346-021-01107-0. Epub 2021 Dec 22.
The development of dissolving microneedles (DMN) is one of the advanced technologies in transdermal drug delivery systems, which precisely deliver the drugs through a rapid dissolution of polymers after insertion into the skin. In this study, we fabricated nanoemulsion-loaded dissolving microneedle (DMN) arrays for intradermal and transdermal drug delivery. For this task, model drug (amphotericin B, AmB)-loaded nanoemulsion (NE) were prepared by the probe-sonication method. AmB-loaded-NE was prepared using Capmul MCM C-8 EP/NF, Tween 80, poly(vinyl alcohol) (PVA-10 kDa), and poly (vinyl pyrrolidone) (PVP-360 kDa or K29/32) by using SpeedMixer™, followed by probe-sonication and evaluated for particle size and polydispersity index (PDI). Transmission electron microscopy (TEM) was also used to assess the particle size before and after DMN casting. AmB-NE embedded DMN arrays were found to be strong enough, revealed efficient skin insertion, and penetrated down to the fourth layer (depth ≈ 508 μm) of Parafilm M (validated skin model). Ex vivo skin deposition experiments in full-thickness neonatal porcine demonstrated that after 24 h, AmB-NE-DMN arrays were able to deposit 111.05 ± 48.4 µg/patch AmB into the skin. At the same time, transdermal porcine skin permeation studies showed significantly higher permeability of AmB (29.60 ± 8.23 μg/patch) from AmB-NE-DMN compared to MN-free AmB-NE patches (5.0 ± 6.15 μg/patch) over 24 h. Antifungal studies of optimized AmB-NE-DMN, AmB-loaded discs and drug-free DMN against Candida albicans, confirmed the synergistic activity of Campul-MCM C-8, used in the nanoemulsion formulation. This study establishes that nanoemulsion based dissolving microneedle may serve as an efficient system for intradermal as well as transdermal drug delivery.
溶解微针(DMN)的发展是经皮给药系统的先进技术之一,它通过在插入皮肤后聚合物的快速溶解,精确地输送药物。在这项研究中,我们制备了载纳米乳液的溶解微针(DMN)阵列,用于皮内和经皮药物输送。为此任务,采用探针超声法制备了模型药物(两性霉素 B,AmB)载纳米乳液(NE)。AmB 载 NE 采用 Capmul MCM C-8 EP/NF、Tween 80、聚乙烯醇(PVA-10 kDa)和聚乙烯吡咯烷酮(PVP-360 kDa 或 K29/32),使用 SpeedMixerTM 混合,然后进行探针超声处理,并评估粒径和多分散指数(PDI)。透射电子显微镜(TEM)也用于评估 DMN 铸造前后的粒径。结果发现,AmB-NE 嵌入的 DMN 阵列足够坚固,能够有效地插入皮肤,并穿透到 Parafilm M(验证的皮肤模型)的第四层(深度≈508 μm)。在全厚新生仔猪的离体皮肤沉积实验中,结果显示,在 24 h 后,AmB-NE-DMN 阵列能够将 111.05±48.4 µg/贴片 AmB 沉积到皮肤中。同时,AmB-NE-DMN 的透皮猪皮渗透研究表明,与 MN 无 AmB-NE 贴片(5.0±6.15 µg/贴片)相比,AmB-NE-DMN 中的 AmB 的渗透性显著更高(29.60±8.23 µg/贴片)24 h 。对优化的 AmB-NE-DMN、载 AmB 圆盘和无药物 DMN 对白色念珠菌的抗真菌研究证实了纳米乳液配方中所用的 Campul-MCM C-8 的协同活性。这项研究表明,基于纳米乳液的溶解微针可能成为皮内和经皮药物输送的有效系统。
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