Stable Co-crystals of Glipizide with Enhanced Dissolution Profiles: Preparation and Characterization.

Stable Co-crystals of Glipizide with Enhanced Dissolution Profiles: Preparation and Characterization. AAPS PharmSciTech. 2017 Feb 07;: Authors: Pandey NK, Sehal HR, Garg V, Gaur T, Kumar B, Singh SK, Gulati M, Gowthamarajan K, Bawa P, Rajesh SY, Sharma P, Narang R Abstract Present study deciphers preparation of co-crystals of lipophilic glipizide by using four different acids, oxalic, malonic, stearic, and benzoic acids, in order to achieve enhanced solubility and dissolution along with stability. All co-crystals were prepared by dissolving drug and individual acids in the ratio of 1:0.5 in acetonitrile at 60-70°C for 15 min, followed by cooling at room temperature for 24 h. FT-IR spectroscopy revealed no molecular interaction between acids and drug as the internal structure and their geometric configurations remain unchanged. Differential scanning calorimetry revealed closer melting points of raw glipizide and its co-crystals, which speculates absence of difference in crystallinity as well as intermolecular bonding of the co-crystals and drug. PXRD further revealed that all the co-crystals were having similar crystallinity as that of raw glipizide except glipizide-malonic acid co-crystals. This minor difference in the relative intensities of some of the diffraction peaks could be attributed to the crystal habit or crystal size modification. SEM revealed difference in the crystal morphology for all the co-crystals. Micromeritic, s...
Source: AAPS PharmSciTech - Category: Drugs & Pharmacology Authors: Tags: AAPS PharmSciTech Source Type: research