Characterization of Pharmaceutical Cocrystals and Salts by Dynamic Nuclear Polarization-Enhanced Solid-State NMR Spectroscopy

Zhao, Li; Hanrahan, Michael P.; Chakravarty, Paroma; Dipasquale, Antonio G.; Sirois, Lauren Elizabeth; Nagapudi, Karthik; Lubach, Joseph W.; Rossini, Aaron J.

doi:10.1021/acs.cgd.8b00203

Title: Characterization of Pharmaceutical Cocrystals and Salts by Dynamic Nuclear Polarization-Enhanced Solid-State NMR Spectroscopy

Journal Article · 15 February 2018 · Crystal Growth and Design

DOI: https://doi.org/10.1021/acs.cgd.8b00203 · OSTI ID:1422770

Zhao, Li ^[1]; Hanrahan, Michael P. ^[1]; Chakravarty, Paroma ^[2]; Dipasquale, Antonio G. ^[2]; Sirois, Lauren Elizabeth ^[2]; Nagapudi, Karthik ^[2]; Lubach, Joseph W. ^[2]; Rossini, Aaron J. ^[1]

Iowa State Univ., Ames, IA (United States). Dept. of Chemistry; Ames Lab., Ames, IA (United States)
Genentech, Inc., San Francisco, CA (United States)

Multicomponent solids such as cocrystals have emerged as a way to control and engineer the stability, solubility and manufacturability of solid active pharmaceutical ingredients (APIs). Cocrystals are typically formed by solution- or solid-phase reactions of APIs with suitable cocrystal coformers, which are often weak acids. One key structural question about a given multicomponent solid is whether it should be classified as a salt, where the basic API is protonated by the acid, or as a cocrystal, where the API and coformer remain neutral and engage in hydrogen bonding interactions. It has previously been demonstrated that solid-state NMR spectroscopy is a powerful probe of structure in cocrystals and salts of APIs, however, the poor sensitivity of solid-state NMR spectroscopy usually restricts the types of experiments that can be performed. Here relayed dynamic nuclear polarization (DNP) was applied to reduce solid-state NMR experiments by one to two orders of magnitude for salts and cocrystals of a complex API. The large sensitivity gains from DNP facilitates rapid acquisition of natural isotopic abundance 13C and 15N solid-state NMR spectra. Critically, DNP enables double resonance 1H-15N solid-state NMR experiments such as 2D 1H-15N HETCOR, 1H-15N CP-build up, 15N{1H} J-resolved/attached proton tests, 1H-15N DIPSHIFT and 1H-15N PRESTO. The latter two experiments allow 1H-15N dipolar coupling constants and H-N bond lengths to be accurately measured, providing an unambiguous assignment of nitrogen protonation state and definitive classification of the multi-component solids as cocrystals or salts. In conclusion, these types of measurements should also be extremely useful in the context of polymorph discrimination, NMR crystallography structure determination and for probing hydrogen bonding in a variety of organic materials.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE; National Science Foundation (NSF)

Grant/Contract Number:: AC02-07CH11358; 1709972

OSTI ID:: 1422770

Report Number(s):: IS-J-9577

Journal Information:: Crystal Growth and Design, Vol. 18, Issue 4; ISSN 1528-7483

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 49 works

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Spectroscopic (FT-IR, FT-Raman, and ¹³ C SS-NMR) and quantum chemical investigations to provide structural insights into nitrofurantoin–4-hydroxybenzoic acid cocrystals Shukla, Anuradha; Khan, Eram; Alsirawan, MHD. Bashir New Journal of Chemistry, Vol. 43, Issue 18 https://doi.org/10.1039/c8nj05946b	journal	January 2019
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