A spectroscopic investigation of losartan polymorphs.

Abstract:

:Losartan, an antihypertensive agent in clinical development, was found to exist in two enantiotropic polymorphic forms, a low-temperature stable form (Form I) and a high-temperature stable form (Form II), the temperatures at which they are stable being related to the transition temperature. X-ray powder diffraction patterns indicated differences in the crystal packing of the two forms. The vibrational data from infrared and Raman spectroscopy suggested a subtle change in molecular conformation and crystal packing in the two forms. Solid-state 13C NMR data of the polymorphs concurred with the vibrational data and indicated that, while the observed line widths reflect no major changes in crystallinity, signal multiplicities and chemical shifts do reflect differences in molecular packing in the respective unit cells. Thus, in the absence of crystallographic data, useful structural information could be derived from spectroscopic results to identify each of the crystalline forms.

journal_name

Pharm Res

journal_title

Pharmaceutical research

authors

Raghavan K,Dwivedi A,Campbell GC Jr,Johnston E,Levorse D,McCauley J,Hussain M

doi

10.1023/a:1018973530443

subject

Has Abstract

pub_date

1993-06-01 00:00:00

pages

900-4

issue

6

eissn

0724-8741

issn

1573-904X

journal_volume

10

pub_type

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