Buccal delivery of low molecular weight heparin by cationic polymethacrylate nanoparticles

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• 作者：Samiha Mouftah^a ; Mona M.A. Abdel-Mottaleb^a ; ^b ; ^c ; ^{mona.abdelmottaleb@pharma.asu.edu.eg} ; Alf Lamprecht^a ; ^b
• 关键词：Buccal mucosa ; Polymethacrylate ; Nanoparticles ; LMWH (Low molecular weight heparin) ; Mucoadhesion
• 刊名：International Journal of Pharmaceutics
• 出版年：2016
• 出版时间：30 December 2016
• 年：2016
• 卷：515
• 期：1-2
• 页码：565-574
• 全文大小：1683 K
• 卷排序：515

文摘

Buccal delivery seems to be a very promising administration route for macromolecular drugs. Here, we explored the potential of cationic polymethacrylate nanoparticles (NPs) as a carrier system for the buccal delivery of low molecular weight heparin (LMWH). LMWH-loaded NPs were prepared by emulsification solvent diffusion method and the NPs were analyzed for their physiochemical properties, rheological evaluations and ex vivo transport studies across buccal mucosa. The prepared LMWH-loaded NPs showed a mean diameter between 400 and 500 nm with unimodal size distribution with negative surface charge. Viscosity measurements revealed a positive rheological synergism between the prepared NPs and mucin when mixed under physiological conditions. After 4 h, about 6.3 ± 0.9% of LMWH was released in case of using Eudragit® RS (ERS); while Eudragit® RL (ERL) NPs released only 3.0 ± 0.3 % of its LMWH content and this incomplete release was slightly ameliorated in the presence of mucin reaching to 7.2 ± 0.3 % and 4.8 ± 0.3 % for ERS and ERL, respectively. The ex-vivo permeability of heparin through the buccal mucosa was significantly increased after using polymetharylate NPs while no heparin permeation was detected from free heparin solution. Confocal laser scanning microscopy (CLSM) imaging indicated the mucoadhesive properties of the polymetharylate NPs where the drug-free NPs were detected in the superficial layers of buccal mucosa. LMWH-loaded NPs had less mucoadhesive properties showing significant deeper penetration of the mucosa. The results indicated that mucoadhesive cationic polymethacrylate NPs offer a possible approach for the buccal delivery of heparin.