title: Characterization of the physicochemical properties of KR-31378.
abstract: KR-31378 is a new drug candidate intended for the use in the prevention of ischemia-reperfusion damage. The objective of this preformulation study was to determine the physicochemical properties of KR-31378. The n-octanol to water partition coefficients of KR-31378 were 0.0504 at pH 3 and 0.8874 at pH 10. Accelerated stability of KR-31378 in solution and solid state was studied at 5, 40, 60 degrees C. The stability testing indicated that the t90 for the drug in solid was estimated to be 2 years and 128.6 days at 25 degrees C, while that in aqueous solution was 68.6 days at 25 degrees C. The KR-31378 was also found to be unstable under the relative humidity of 76%, probably because of the hygroscopic nature of the drug. In order to study compatibility of KR-31378 with typical excipients, potential change in differential scanning calorimetry spectrum was studied in 1:1 binary mixtures of KR-31378 and Aerosil, Avicel, Eudragit, lactose, PEG, talc, CMC, PVP, starch. As a result, CMC, PVP, and starch were found to be incompatible with KR-31378, indicating the addition of these excipients may complicate the manufacturing of the formulation for the drug. Particle size distribution of KR-31378 powder was in the size range of 9-93 microm with the mean particle size of 37.9 microm. The flowability of KR-31378 was apparently inadequate, indicating the granulation may be necessary for the processing of the drug to solid dosage forms. Crystallization of the drug with a number of organic solvents did not lead a crystalline polymorphism. In addition, dissolution of the drug from the powder was adequately rapid at 37 degrees C in water.
authors.affiliation: College of Pharmacy, Duksung Women's University, 132-714 Seoul, Korea. ytsohn@center.duksung.ac.kr
authors.forename: Young Taek
authors.initials: YT
authors.lastname: Sohn
authors.forename: Bo Ye
authors.initials: BY
authors.lastname: Park
mesh_terms: D055598:Chemical Phenomena; D002627:Chemistry, Physical; D018360:Crystallography, X-Ray / Q000379:methods; D006146:Guanidines / Q000737:chemistry*; D010316:Particle Size; D011714:Pyrans / Q000737:chemistry*; D012995:Solubility; D013056:Spectrophotometry, Ultraviolet / Q000379:methods
chemical_list: D006146:Guanidines; C438686:N''-cyano-N-(6-amino-3,4-dihydro-3-hydroxy-2-methyl-2-dimethoxymethyl-2H-benzopyran-4-yl)-N'-benzylguanidine; D011714:Pyrans