Pugliese, Andrea, Hawarden, Lucy E, Abraham, Anuji, Tobyn, Michael and Blanc, Frederic ORCID: 0000-0001-9171-1454
(2020)
Solid state nuclear magnetic resonance studies of hydroxypropylmethylcellulose acetyl succinate polymer, a useful carrier in pharmaceutical solid dispersions.
MAGNETIC RESONANCE IN CHEMISTRY, 58 (11).
pp. 1036-1048.
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Abstract
Hydroxypropylmethylcellulose (HPMC) acetyl succinate (HPMC-AS) is a key polymer used for the enablement of amorphous solid dispersions (ASDs) in oral solid dosage forms. Choice of the appropriate grade within the material is often made empirically by the manufacturer of small-scale formulations, followed by extensive real time stability. A key factor in understanding and predicting the performance of an ASD is related to the presence of hydrogen (or other) bonds between the polymer and active pharmaceutical ingredient (API), which will increase stability over the parameters captured by miscibility and predicted by the Gordon-Taylor equation. Solid state nuclear magnetic resonance (NMR) is particularly well equipped to probe spatial proximities, for example, between polymer and API; however, in the case of HPMC-AS, these interactions have been sometimes difficult to identity as the carbon-13 NMR spectra assignment is yet to be firmly established. Using feedstock, selectively substituted HPMC polymers, and NMR editing experiments, we propose here a comprehensive understanding of the chemical structure of HPMC-AS and a definitive spectral assignment of the <sup>13</sup> C NMR spectra of this polymer. The NMR data also capture the molar ratios of the acetate and succinate moieties present in HPMC-AS of various grades without the need for post treatment required by chromatography methods commonly use in pharmacopoeia. This knowledge will allow the prediction and measurement of interactions between polymers and APIs and therefore a rational choice of polymer grade to enhance the solid state stability of ASDs.
Item Type: | Article |
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Uncontrolled Keywords: | amorphous solid dispersion, C-13, hydroxypropylmethylcellulose, HPMC-AS, solid-state NMR spectroscopy |
Depositing User: | Symplectic Admin |
Date Deposited: | 03 Mar 2020 11:17 |
Last Modified: | 18 Jan 2023 23:59 |
DOI: | 10.1002/mrc.4984 |
Open Access URL: | https://doi.org/10.1002/mrc.4984 |
Related URLs: | |
URI: | https://livrepository.liverpool.ac.uk/id/eprint/3077570 |
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Solid state nuclear magnetic resonance studies of hydroxypropylmethylcellulose acetyl succinate polymer, a useful carrier in pharmaceutical solid dispersions. (deposited 07 Jan 2020 15:02)
- Solid state nuclear magnetic resonance studies of hydroxypropylmethylcellulose acetyl succinate polymer, a useful carrier in pharmaceutical solid dispersions. (deposited 03 Mar 2020 11:17) [Currently Displayed]