title: Highly sensitive solid forms discrimination on the whole tablet of the active ingredients in quercetin dietary supplements by NMR crystallography approaches.
abstract: Similarly to synthetic drugs, the exact crystalline form of active ingredients in solid formulations of dietary supplements may directly influence the dissolution rate, bioavailability, and stability of the final product, but this information is usually not provided by manufacturers. Working on the examples of two commercial quercetin dietary supplements a quick, reliable, and sensitive method is introduced for quercetin solid forms discrimination directly on the marketed products, without the need for prior sample preparation. It exploits the complementarity between solid-state Nuclear Magnetic Resonance (ss-NMR) and Powder X-Ray Diffraction (PXRD), which proved essential for performing a complete and accurate solid-state characterization of the two commercial products, and for obtaining new insights into the complex quercetin solid-forms landscape. The method can be readily generalized also to other dietary supplements based on bio-flavonoids/polyphenols.
authors.affiliation: National Institute for Research and Development of Isotopic and Molecular Technologies, 400293 Cluj-Napoca, Romania; Babeş-Bolyai University, Faculty of Physics, Mihail Kogalniceanu, no. 1, RO-400084 Cluj-Napoca, Romania.
authors.forename: Maria O
authors.initials: MO
authors.lastname: Miclaus
authors.affiliation: National Institute for Research and Development of Isotopic and Molecular Technologies, 400293 Cluj-Napoca, Romania.
authors.forename: Xenia
authors.initials: X
authors.lastname: Filip
authors.affiliation: National Institute for Research and Development of Isotopic and Molecular Technologies, 400293 Cluj-Napoca, Romania.
authors.forename: Claudiu
authors.initials: C
authors.lastname: Filip
authors.affiliation: National Institute for Research and Development of Isotopic and Molecular Technologies, 400293 Cluj-Napoca, Romania.
authors.forename: Flavia A
authors.initials: FA
authors.lastname: Martin
authors.affiliation: National Institute for Research and Development of Isotopic and Molecular Technologies, 400293 Cluj-Napoca, Romania. Electronic address: ioana.grosu@itim-cj.ro.
authors.forename: Ioana G
authors.initials: IG
authors.lastname: Grosu
mesh_terms: D019587:Dietary Supplements; D057230:Limit of Detection; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D033362:Powder Diffraction / Q000379:methods*; D011794:Quercetin / Q000737:chemistry*; D013607:Tablets
chemical_list: D013607:Tablets; D011794:Quercetin
keywords: Bio-flavonoids; Dietary supplements; PXRD; Polyphenols; Quercetin; Solid-state NMR