title: Transdermal delivery of selegiline from alginate-Pluronic composite thermogels.
abstract: The present work was carried out to design a practical, controlled-release transdermal system for selegiline using thermosensitive hydrogels. The copolymers of alginate and Pluronic F127 (PF127) were used to design thermogels by either physical blending (A+P) or chemical grafting (AP). The thermogels were characterized in terms of the sol-gel temperature, scanning electron microscopy (SEM), degradation ratio, and skin permeation behavior. The chemical grafting of alginate to PF127 could delay the sol-gel temperature from 24.1 to 30.4°C, which is near the temperature of the skin surface. The gelling temperature of the physical mixture of alginate and PF127 (A+P) did not significantly differ. The porosity of the A+P structure was greater compared to that of the AP structure. AP thermogels were regularly degraded, with 60% of the gel matrix remaining after a 48-h incubation. PF127 and A+P hydrogels showed almost no degradation. The results of skin permeation across porcine skin and nude mouse skin suggested that the thermogels could produce sustained selegiline release, with AP showing the most-sustained permeation. AP hydrogels exhibited linear permeation properties for the transdermal delivery of selegiline. Inter-subject variations in skin permeation were reduced by incorporation of the thermogel. Such a thermosensitive hydrogel can be advantageous as a topical therapeutic formulation for selegiline.
authors.affiliation: Pharmaceutics Laboratory, Graduate Institute of Natural Products, Chang Gung University, Kweishan, Taoyuan, Taiwan.
authors.forename: Chih-Chieh
authors.initials: CC
authors.lastname: Chen
authors.forename: Chia-Lang
authors.initials: CL
authors.lastname: Fang
authors.forename: Saleh A
authors.initials: SA
authors.lastname: Al-Suwayeh
authors.forename: Yann-Lii
authors.initials: YL
authors.lastname: Leu
authors.forename: Jia-You
authors.initials: JY
authors.lastname: Fang
mesh_terms: D000279:Administration, Cutaneous; D000464:Alginates / Q000737:chemistry*; D000818:Animals; D002851:Chromatography, High Pressure Liquid; D004337:Drug Carriers / Q000138:chemical synthesis / Q000737:chemistry*; D004339:Drug Compounding; D005260:Female; D005612:Freeze Drying; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D020100:Hydrogels; D066298:In Vitro Techniques; D051379:Mice; D008819:Mice, Nude; D008855:Microscopy, Electron, Scanning; D008996:Monoamine Oxidase Inhibitors / Q000008:administration & dosage* / Q000737:chemistry / Q000493:pharmacokinetics; D044367:Phase Transition; D020442:Poloxamer / Q000737:chemistry*; D012642:Selegiline / Q000008:administration & dosage* / Q000737:chemistry / Q000493:pharmacokinetics; D012867:Skin / Q000378:metabolism*; D012869:Skin Absorption; D012881:Skin Temperature; D013499:Surface Properties; D013552:Swine; D044366:Transition Temperature
chemical_list: D000464:Alginates; D004337:Drug Carriers; D006603:Hexuronic Acids; D020100:Hydrogels; D008996:Monoamine Oxidase Inhibitors; D020442:Poloxamer; D012642:Selegiline; D020723:Glucuronic Acid