title: Designing Solvent Exchange-Induced In Situ Forming Gel from Aqueous Insoluble Polymers as Matrix Base for Periodontitis Treatment.
abstract: An in situ forming gel is a dosage form which is promised for site-specific therapy such as periodontal pocket of periodontitis treatment. Ethylcellulose, bleached shellac, and Eudragit RS were applied in this study as a polymeric matrix for in situ forming gel employing N-methyl pyrrolidone (NMP) as solvent. Solutions comprising ethylcellulose, bleached shellac, and Eudragit RS in NMP were evaluated for viscosity, rheology, and rate of water penetration. Ease of administration by injection was determined as the force required to expel polymeric solutions through a needle using texture analyzer. In vitro gel formation and in vitro gel degradation were conducted after injection into phosphate buffer solution pH 6.8. Ethylcellulose, bleached shellac, and Eudragit RS could form the in situ gel, in vitro. Gel viscosity and pH value depended on percentage amount of the polymer, whereas the water diffusion at early period likely relied on types of polymer. Furthermore, the solutions containing higher polymer concentration exhibited the lower degree of degradation. All the preparations were acceptable as injectable dosage forms because the applied force was lower than 50 N. All of them inhibited Staphylococcus aureus, Escherichia coli, Candida albicans, Streptococcus mutans, and Porphyrommonas gingivalis growth owing to antimicrobial activity of NMP which exhibited a potential use for periodontitis treatment. Moreover, the developed systems presented as the solvent exchange induced in situ forming gel and showed capability to be incorporated with the suitable antimicrobial active compounds for periodontitis treatment which should be further studied.
authors.affiliation: Faculty of Pharmaceutical Sciences, Burapa University, Chonburi, 20131, Thailand.
authors.forename: Tharatree
authors.initials: T
authors.lastname: Srichan
authors.affiliation: Department of Pharmaceutical Technology, Faculty of Pharmacy, Silpakorn University, Nakorn Pathom, Nakorn Pathom, 73000, Thailand. thawatchaienator@gmail.com.
authors.forename: Thawatchai
authors.initials: T
authors.lastname: Phaechamud
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D000890:Anti-Infective Agents / Q000008:administration & dosage / Q000737:chemistry; D002176:Candida albicans / Q000187:drug effects; D002482:Cellulose / Q000031:analogs & derivatives / Q000737:chemistry; D004058:Diffusion; D016503:Drug Delivery Systems / Q000379:methods; D004926:Escherichia coli / Q000187:drug effects; D005782:Gels / Q000008:administration & dosage* / Q000737:chemistry*; D010518:Periodontitis / Q000188:drug therapy* / Q000382:microbiology; D011108:Polymers / Q000737:chemistry*; D016966:Porphyromonas gingivalis / Q000187:drug effects; D011760:Pyrrolidinones / Q000737:chemistry; D012116:Resins, Plant / Q000737:chemistry; D012995:Solubility; D012997:Solvents / Q000737:chemistry*; D013211:Staphylococcus aureus / Q000187:drug effects; D013295:Streptococcus mutans / Q000187:drug effects; D014783:Viscosity; D014867:Water / Q000737:chemistry*
chemical_list: D000180:Acrylic Resins; D000890:Anti-Infective Agents; D005782:Gels; D011108:Polymers; D011760:Pyrrolidinones; D012116:Resins, Plant; D012997:Solvents; D014867:Water; C050528:Eudragit RS; C003934:shellac; C013517:ethyl cellulose; D002482:Cellulose; C038678:N-methylpyrrolidone
keywords: bleached shellac; ethycellulose; eudragit RS; in situ forming gel; periodontitis treatment