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Search: WFRF:(Seaton S) > (2010-2014)

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1.
  • O'Mahony, M. A., et al. (author)
  • Investigation into the mechanism of solution-mediated transformation from FI to FIII carbamazepine : The role of dissolution and the interaction between polymorph surfaces
  • 2013
  • In: Crystal Growth and Design. - : American Chemical Society (ACS). - 1528-7505 .- 1528-7483. ; 13:5, s. 1861-1871
  • Journal article (peer-reviewed)abstract
    • The solution mediated polymorphic transformation (SMPT) of the pharmaceutical compound carbamazepine was investigated in ethanol. Bulk transformation experiments were performed by monitoring the solution concentration and polymorphic composition over time during the transformation from the metastable FI polymorph to the stable FIII polymorph for a variety of initial conditions. Microscopic techniques, single-crystal X-ray diffraction, and computational methods were used to analyze the transformation. The nucleating behavior of the stable FIII polymorph was a significant factor affecting the transformation time across the range of experiments. The surfaces of the metastable FI particles were responsible for the nucleation of FIII during the transformation. However, no specific lattice matching or epitaxy was conclusively identified. A modest amount of dissolution of the FI particles was found to favor the nucleation of FIII but where extensive dissolution or no significant dissolution occurred this had a negative effect on the nucleation of FIII. 
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2.
  • O'Mahony, M., et al. (author)
  • Investigating the dissolution of the metastable triclinic polymorph of carbamazepine using in situ microscopy
  • 2014
  • In: CrystEngComm. - Royal Society of Chemistry (RSC)) : Royal Society of Chemistry (RSC). - 1466-8033. ; 16:20, s. 4133-4141
  • Journal article (peer-reviewed)abstract
    • Despite a tendency to undergo solution-mediated polymorphic transformation, the dissolution behaviour of the metastable FI (triclinic) polymorph of the pharmaceutical compound carbamazepine (CBZ) was investigated using in situ optical microscopy. Experiments were performed at an undersaturation where single crystals of the metastable FI polymorph dissolved. Dissolution in different solvents was investigated at a constant undersaturation. Separately the sublimation of FI was examined and additionally the dissolution was observed at undersaturations where the more stable FIII polymorph crystallized. The results show that both the dissolution and sublimation of FI occur primarily in the direction of the a-axis of the FI crystal structure where the CBZ molecules are found to stack in this direction. The order for the dissolution rate of FI was acetonitrile ≥ methanol > ethanol. The order of the dissolution rates in each of the solvents is inversely correlated to the viscosity and the binding energy of the solvents with the (100) surface of FI in each of the solvents. This suggests that the rate determining step for the dissolution may be either the diffusion or the detachment of CBZ molecules from the surface of FI. A notable difference in dissolution behaviour is also observed at undersaturations where the more stable FIII polymorph nucleates and grows.
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  • Result 1-2 of 2
Type of publication
journal article (2)
Type of content
peer-reviewed (2)
Author/Editor
Rasmuson, Åke C. (2)
Croker, D. M. (2)
Hodnett, B. K. (2)
Seaton, C. C. (2)
Veesler, S. (2)
O'Mahony, M. A. (1)
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O'Mahony, M. (1)
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University
Royal Institute of Technology (2)
Language
English (2)
Research subject (UKÄ/SCB)
Natural sciences (2)

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