title: Stability assessment of injectable castor oil-based nano-sized emulsion containing cationic droplets stabilized by poloxamer-chitosan emulsifier films.
abstract: The objectives of the present work were to prepare castor oil-based nano-sized emulsion containing cationic droplets stabilized by poloxamer-chitosan emulgator film and to assess the kinetic stability of the prepared cationic emulsion after subjecting it to thermal processing and freeze-thaw cycling. Presence of cryoprotectants (5%, w/w, sucrose +5%, w/w, sorbitol) improved the stability of emulsions to droplet aggregation during freeze-thaw cycling. After storing the emulsion at 4 degrees C, 25 degrees C, and 37 degrees C over a period of up to 6 months, no significant change was noted in mean diameter of the dispersed oil droplets. However, the emulsion stored at the highest temperature did show a progressive decrease in the pH and zeta potential values, whereas the emulsion kept at the lowest temperatures did not. This indicates that at 37 degrees C, free fatty acids were formed from the castor oil, and consequently, the liberated free fatty acids were responsible for the reduction in the emulsion pH and zeta potential values. Thus, the injectable castor oil-based nano-sized emulsion could be useful for incorporating various active pharmaceutical ingredients that are in size from small molecular drugs to large macromolecules such as oligonucleotides.
authors.affiliation: International Medical University SDN BHD, No. 126, Jalan 19/155B, Bukit Jalil, 57000, Kuala Lumpur, Malaysia. tamilvanan2k@yahoo.com
authors.forename: S
authors.initials: S
authors.lastname: Tamilvanan
authors.forename: B Ajith
authors.initials: BA
authors.lastname: Kumar
authors.forename: S R
authors.initials: SR
authors.lastname: Senthilkumar
authors.forename: Raj
authors.initials: R
authors.lastname: Baskar
authors.forename: T Raja
authors.initials: TR
authors.lastname: Sekharan
mesh_terms: D002368:Castor Oil / Q000737:chemistry*; D002412:Cations; D048271:Chitosan / Q000737:chemistry*; D004058:Diffusion; D004337:Drug Carriers / Q000737:chemistry; D004339:Drug Compounding / Q000379:methods; D004355:Drug Stability; D004655:Emulsions / Q000737:chemistry*; D007267:Injections; D008567:Membranes, Artificial; D053769:Nanocapsules / Q000737:chemistry*; D004364:Pharmaceutical Preparations / Q000737:chemistry*; D020442:Poloxamer / Q000737:chemistry*; D012995:Solubility; D012996:Solutions
chemical_list: D002412:Cations; D004337:Drug Carriers; D004655:Emulsions; D008567:Membranes, Artificial; D053769:Nanocapsules; D004364:Pharmaceutical Preparations; D012996:Solutions; D020442:Poloxamer; D002368:Castor Oil; D048271:Chitosan