Patent ID: 7955607
Filing Date: 2011-06-07
Classification: A61K,A61P,C07C,G01N

Abstract:
1. A method for evaluating evenness in the crystallinity of suplatast tosilate crystals, comprising: (a)(i) adding a solvent to suplatast tosilate crystals to thereby dissolve 3% or less of the crystals in the solvent and form a suspension, and (ii) subjecting a portion of the supernatant of the resultant suspension to an optical purity measurement; (b)(i) adding a solvent to the remaining suspension to thereby dissolve the entirety of the suplatast tosilate crystals in the suspension in the solvent, and (ii) subjecting a portion of the resultant solution to an optical purity measurement; and (c) comparing the optical purity measurement (a)(ii) to the optical purity measurement (b)(ii).