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Indexing powder patterns in physical form screening: Instrumentation and data quality

Florence, A.J. and Baumgartner, B. and Weston, C. and Shankland, N. and Kennedy, A.R. and Shankland, K. and David, W.I.F. (2003) Indexing powder patterns in physical form screening: Instrumentation and data quality. Journal of Pharmaceutical Sciences, 92 (9). pp. 1930-1938. ISSN 0022-3549

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Abstract

Two multisample laboratory powder diffractometers have been evaluated for the purpose of pattern indexing in the context of physical form screening. Both diffractometers utilise foil transmission geometry, primary monochromated radiation, and a position-sensitive detector. Data collected from six compounds (sotalol hydrochloride, hydroflumethiazide, verapamil hydrochloride, captopril, clomipramine hydrochloride, and famotidine) showed good angular resolution (FWHM as small as ca. 0.06°) and lattice parameters were easily obtained using the indexing program DICVOL-91. The extent of preferred orientation in each pattern was estimated using the DASH implementation of the March-Dollase function and is most evident with clomipramine hydrochloride and famotidine. Otherwise, the data compare favorably with reference capillary data sets. In conclusion, where there is a requirement to analyze 20-30 samples per day, with an emphasis on obtaining the high-quality data that are important in pattern recognition and imperative in indexing, the combination of foil transmission geometry, primary monochromated radiation, plus a position-sensitive detector is highly effective. The data also afford opportunities for crystal structure determination.

Item type: Article
ID code: 1089
Keywords: high-throughput technologies, physical form screen, physical characterization, crystallography, X-ray powder diffractometry, powder pattern indexing, crystal structure, DICVOL-91, DASH, Chemistry, Pharmaceutical Science
Subjects: Science > Chemistry
Department: Faculty of Science > Pure and Applied Chemistry
Faculty of Science > Strathclyde Institute of Pharmacy and Biomedical Sciences
Faculty of Science > Strathclyde Institute of Pharmacy and Biomedical Sciences > Pharmaceutical Sciences
Related URLs:
    Depositing user: Catriona Mccallum
    Date Deposited: 19 May 2006
    Last modified: 04 Sep 2014 11:57
    URI: http://strathprints.strath.ac.uk/id/eprint/1089

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