title: Multicomponent analysis of fat- and water-soluble vitamins and auxiliary substances in multivitamin preparations by qNMR.
abstract: A nuclear magnetic resonance (NMR) spectroscopic method was tested to control 12 vitamins and accompanying substances in multivitamin preparations. The limits of detection (LODs) and limits of quantification (LOQs) varied in the 9.0-77.0 mg/kg and in the 34.5-93.5 mg/kg range, respectively. The coefficients of variation (CVs) ranged between 0.9% and 12%. The (1)H NMR spectra showed linearity for the 140-260 mg sample weight (R(2) > 0.918). The NMR spectra of multivitamin preparations showed the presence of different degradation products of ascorbic acid. The NMR method was applied to 13 different multivitamin preparations including tablets, capsules, and effervescent tablets with average recovery rates between 85% and 132%. A number of accompanying substances (citric acid, mannitol, saccharin, cyclamate, sum of steviol glycosides, and butylhydroxytoluene) were additionally identified and quantified. NMR was found to be suitable for the simultaneous qualitative measurement of water- and fat-soluble vitamins and accompanying substances and shows some promise for quantitative determination of at least 5 vitamins (B1, B3, B5, B6, and E) in multivitamin preparations.
authors.affiliation: †Spectral Service AG, Emil-Hoffmann-Straße 33, 50996 Köln, Germany.
authors.forename: Julia
authors.initials: J
authors.lastname: Eiff
authors.affiliation: †Spectral Service AG, Emil-Hoffmann-Straße 33, 50996 Köln, Germany.|‡Institute of Chemistry, Saratov State University, Astrakhanskaya Street 83, 410012 Saratov, Russia.
authors.forename: Yulia B
authors.initials: YB
authors.lastname: Monakhova
authors.affiliation: †Spectral Service AG, Emil-Hoffmann-Straße 33, 50996 Köln, Germany.
authors.forename: Bernd W K
authors.initials: BW
authors.lastname: Diehl
mesh_terms: D002626:Chemistry, Pharmaceutical; D004304:Dosage Forms; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D012995:Solubility; D014815:Vitamins / Q000737:chemistry*
chemical_list: D004304:Dosage Forms; D014815:Vitamins
keywords: accompanying substances; ascorbic acid; multivitamin preparations; qNMR; vitamins