title: Impacts of compression on crystallization behavior of freeze-dried amorphous sucrose.
abstract: An amorphous matrix comprised of sugar molecules is used as excipient and stabilizing agent for labile ingredients in the pharmaceutical industry. The amorphous sugar matrix is often compressed into a tablet form to reduce the volume and improve handling. Herein, the effect of compression on the crystallization behavior of an amorphous sucrose matrix was investigated. Amorphous sucrose samples were prepared by freeze-drying and compressed under different conditions, followed by analyses by differential scanning calorimetry, isothermal crystallization tests, X-ray powder diffractometry, Fourier transform infrared spectroscopy (FTIR), and gas pycnometry. The compressed sample had a lower crystallization temperature and a shorter induction period for isothermal crystallization, indicating that compression facilitates the formation of the critical nucleus of a sucrose crystal. Based on FTIR and molecular dynamics simulation results, the conformational distortion of sucrose molecules due to the compression appears to contribute to the increase in the free energy of the system, which leads to the facilitation of critical nucleus formation. An isothermal crystallization test indicated an increase in the growth rate of sucrose crystals by the compression. This can be attributed to the transformation of the microstructure from porous to nonporous, as the result of compression.
authors: Department of Bioscience and Biotechnology, Faculty of Engineering, Okayama University, Okayama 700-8530, Japan. kore@cc.okayama-u.ac.jp
authors: Koreyoshi
authors: K
authors: Imamura
authors: Mayo
authors: M
authors: Nomura
authors: Kazuhiro
authors: K
authors: Tanaka
authors: Nobuhide
authors: N
authors: Kataoka
authors: Jun
authors: J
authors: Oshitani
authors: Hiroyuki
authors: H
authors: Imanaka
authors: Kazuhiro
authors: K
authors: Nakanishi
mesh_terms: D003460:Crystallization / Q000379:methods*; D005612:Freeze Drying / Q000379:methods*; D007700:Kinetics; D008958:Models, Molecular; D011208:Powders / Q000737:chemistry; D011312:Pressure; D013395:Sucrose / Q000737:chemistry*; D013499:Surface Properties; D013997:Time Factors; D044366:Transition Temperature
chemical_list: D011208:Powders; D013395:Sucrose