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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemistry
Complex Formation of Nitrazepam in Coprecipitating and in Co-grinding with Methylated fl-Cyclodextrins
Chemical and Pharmaceutical Bulletin, Volume 38, No. 12, Year 1990
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Description
Complex formation of nitrazepam with heptakis-(2,6-di-0-methyl)-β-cyclodextrin (DM-β-CyD) and heptakis-(2,3,6-tri-0-methyl)-/J-cyclodextrin (TM-/J-CyD) together with a-, β-, and y-cyclodextrins (CyDs) in aqueous solution was confirmed by the solubility method. AL type phase solubility diagrams were obtained in all cases. The highest stability constant and the highest solubilized amount of nitrazepam was obtained with DM-/J-CyD, in the order DM-β-CyD > /J-CyD > TM-0-CyD > y-CyD > oc-CyD. Complex formation of nitrazepam with DM-β-CyD and TM-/f-CyD in the solid state was assessed by differential scanning calorimetry (DSC), infrared (IR) spectroscopy and X-ray diffractometry. Crystalline inclusion complex of nitrazepam with DM-/f-CyD in 1:2 molar ratio was obtained by the coprecipitation method. X-Ray diffraction analyses explained that nitrazepam was transformed from the crystalline to non-crystalline (amorphous) state by grinding with methylated β-CyDs. DSC analyses revealed that the heat of fusion due to nitrazepam disappeared in the ground mixture and coprecipitate of nitrazepam with DM-β-CyD in 1:2 molar ratio, which demonstrated the optimum content of dispersal nitrazepam with DM-/J-CyD in the solid state. IR spectra showed that there were higher frequency shifts for the carbonyl stretching band of nitrazepam in the ground mixtures and coprecipitates of DM-/S-CyD and TM-/f-CyD similar to the case of nitrazepam in CHCl3 solution, which were considered due to the monomolecular dispersion of nitrazepam in a hydrophobic environment. © 1990, The Pharmaceutical Society of Japan. All rights reserved.
Authors & Co-Authors
Ahmed, Mahrous Osman
Egypt, Asiut
Chiba University
Nakai, Yoshinobu
Egypt, Asiut
Chiba University
Yamamoto, Keiji
Egypt, Asiut
Chiba University
Aboutaleb, Ahmed El Said
Egypt, Asiut
Chiba University
Zaher, Aly Abdel
Egypt, Asiut
Chiba University
Rahman, R.
Egypt, Asiut
Chiba University
Saleh, Saleh Ismaeil
Egypt, Asiut
Chiba University
Statistics
Citations: 7
Authors: 7
Affiliations: 1
Identifiers
Doi:
10.1248/cpb.38.3423
ISSN:
00092363
e-ISSN:
13475223