title: A polymeric micellar carrier for the solubilization of biphenyl dimethyl dicarboxylate.
abstract: A polymeric micelle drug delivery system was developed to enhance the solubility of poorly-water soluble drug, biphenyl dimethyl dicarboxylate, DDB. The block copolymers consisting of poly(D,L-lactide) (PLA) as the hydrophobic segment and methoxy poly(ethylene glycol) (mPEG) as the hydrophilic segment were synthesized and characterized by NMR, DSC and MALDI-TOF mass spectroscopy. The size of the polymeric micelles measured by dynamic light scattering showed a narrow monodisperse size distribution with the average diameter less than 50 nm. The MW of mPEG-PLA, 3000 (MW of mPEG, 2 K; MW of PLA, 1 K), and the presence of hydrophilic and hydrophobic segments on the polymeric micelles were confirmed by MALDI-TOF mass spectroscopy and NMR, respectively. Polymeric micelle solutions of DDB were prepared by three different methods, i.e. the matrix method, emulsion method and dialy-sis method. In the matrix method, DDB solubility was reached to 13.29 mg/mL. The mPEG-PLA 2K-1 K micelle system was compared with the poloxamer 407 micelle system for their critical micelle concentration, micelle size, solubilizing capacity, stability in dilution and physical state. DDB loaded-polymeric micelles prepared by the matrix method showed a significantly increased aqueous solubility (>5000 fold over intrinsic solubility) and were found to be superior to the poloxamer 407 micelles as a drug carrier.
authors.affiliation: Sungkyunkwan University, 300 Chonchon-Dong, Changan-Gu, Suwon, Kyonggi-Do 440-746, Korea.
authors.forename: Sang-Cheol
authors.initials: SC
authors.lastname: Chi
authors.forename: Dae-Il
authors.initials: DI
authors.lastname: Yeom
authors.forename: Sung-Chul
authors.initials: SC
authors.lastname: Kim
authors.forename: Eun-Seok
authors.initials: ES
authors.lastname: Park
mesh_terms: D002152:Calorimetry, Differential Scanning; D002851:Chromatography, High Pressure Liquid; D004149:Dioxoles / Q000737:chemistry*; D004337:Drug Carriers / Q000737:chemistry; D004339:Drug Compounding; D004355:Drug Stability; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008823:Micelles; D020442:Poloxamer / Q000737:chemistry; D011091:Polyesters / Q000737:chemistry; D011092:Polyethylene Glycols / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D012995:Solubility
chemical_list: D004149:Dioxoles; D004337:Drug Carriers; D008823:Micelles; D011091:Polyesters; D011108:Polymers; D020442:Poloxamer; D011092:Polyethylene Glycols; C033616:poly(lactide); C041398:7,7'-dimethoxy-(4,4'-bi-1,3-benzodioxole)-5,5'-dicarboxylic acid dimethyl ester; C028210:monomethoxypolyethylene glycol