title: Poly(L-lactide)/halloysite nanotube electrospun mats as dual-drug delivery systems and their therapeutic efficacy in infected full-thickness burns.
abstract: In this study, poly(L-lactide) (PLLA)/halloysite nanotube (HNT) electrospun mats were prepared as a dual-drug delivery system. HNTs were used to encapsulate polymyxin B sulphate (a hydrophilic drug). Dexamethasone (a hydrophobic drug) was directly dissolved in the PLLA solution. The drug-loaded HNTs with optimised encapsulation efficiency were then mixed with the PLLA solution for subsequent electrospinning to form composite dual-drug-loaded fibre mats. The structure, morphology, degradability and mechanical properties of the electrospun composite mats were characterised in detail. The results showed that the HNTs were uniformly distributed in the composite PLLA mats. The HNTs content in the mats could change the morphology and average diameter of the electrospun fibres. The HNTs improved both the tensile strength of the PLLA electrospun mats and their degradation ratio. The drug-release kinetics of the electrospun mats were investigated using ultraviolet-visible spectrophotometry. The HNTs/PLLA ratio could be varied to adjust the release of polymyxin B sulphate and dexamethasone. The antibacterial activity in vitro of the mats was evaluated using agar diffusion and turbidimetry tests, which indicated the antibacterial efficacy of the dual-drug delivery system against Gram-positive and -negative bacteria. Healing in vivo of infected full-thickness burns and infected wounds was investigated by macroscopic observation, histological observation and immunohistochemical staining. The results indicated that the electrospun mats were capable of co-loading and co-delivering hydrophilic and hydrophobic drugs, and could potentially be used as novel antibacterial wound dressings.
authors.affiliation: Department of Materials Science and Engineering, Jinan University, Guangzhou, China.
authors.forename: Xiazhi
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Department of Biomedical Engineering, Jinan University, Guangzhou, China.
authors.forename: Rui
authors.initials: R
authors.lastname: Guo
authors.affiliation: Department of Materials Science and Engineering, Jinan University, Guangzhou, China.
authors.forename: Jiqing
authors.initials: J
authors.lastname: Xu
authors.affiliation: Department of Materials Science and Engineering, Jinan University, Guangzhou, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Lan
authors.affiliation: Department of Materials Science and Engineering, Jinan University, Guangzhou, China tjiaoyp@jnu.edu.cn tcrz9@jnu.edu.cn.
authors.forename: Yanpeng
authors.initials: Y
authors.lastname: Jiao
authors.affiliation: Department of Materials Science and Engineering, Jinan University, Guangzhou, China.
authors.forename: Changren
authors.initials: C
authors.lastname: Zhou
authors.affiliation: School of Medicine, Jinan University, Guangzhou, China.
authors.forename: Yaowu
authors.initials: Y
authors.lastname: Zhao
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry; D000818:Animals; D000900:Anti-Bacterial Agents / Q000008:administration & dosage* / Q000627:therapeutic use; D000893:Anti-Inflammatory Agents / Q000008:administration & dosage* / Q000627:therapeutic use; D001419:Bacteria / Q000187:drug effects; D001424:Bacterial Infections / Q000188:drug therapy; D002056:Burns / Q000188:drug therapy* / Q000382:microbiology / Q000473:pathology; D000077215:Clay; D003907:Dexamethasone / Q000008:administration & dosage* / Q000627:therapeutic use; D016503:Drug Delivery Systems; D008297:Male; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure; D011091:Polyesters / Q000737:chemistry*; D011112:Polymyxin B / Q000008:administration & dosage* / Q000627:therapeutic use; D017207:Rats, Sprague-Dawley
chemical_list: D000538:Aluminum Silicates; D000900:Anti-Bacterial Agents; D000893:Anti-Inflammatory Agents; D011091:Polyesters; C033616:poly(lactide); D003907:Dexamethasone; D011112:Polymyxin B; D000077215:Clay
keywords: Dual-drug delivery systems; electrospun mats; halloysite nanotubes; infected full-thickness burn; poly(l-lactide)