Journal
CRYSTAL GROWTH & DESIGN
Volume 18, Issue 9, Pages 5556-5563Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.cgd.8b00859
Keywords
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Funding
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- University of Alberta
- consortium of Canadian universities
- NSERC RTI grant
- National Research Council of Canada
- Bruker BioSpin
- University of Alberta Undergraduate Research Initiative
- Dr. R. Norman and Magda Kemeny Jones Summer Studentship
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Curcumin, a compound derived from the herb turmeric, has gained considerable attention because of its purported pharmacological activity, but its poor water solubility and low bioavailability impedes its therapeutic potential. In addition to the frequently studied curcumin polymorph, referred to as form I, another polymorph with enhanced water solubility, referred to as form II, or red curcumin, has also been reported. We discuss experimental challenges in isolating the red curcumin polymorph. In the course of our studies, we were unable to obtain a third reported polymorph, form III. We redetermined crystal structures of forms I and II of curcumin and present C-13 and H-1 solid-state nuclear magnetic resonance (NMR) spectra for these two forms, as well as(13)C-H-1 two-dimensional heteronuclear correlation (HETCOR) data. The experimental H-1 and C-13 nuclear magnetic resonance (NMR) chemical shifts are compared with GIPAW density functional theory values computed using CASTEP. Our research illustrates the utility of NMR spectroscopy in characterization of polymorphism in bulk samples.
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