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Publisher: Altai State University
Journal: Khimiia rastitel'nogo syr'ia (Chemistry of plant raw material)
Languages: Russian
Types: Article
Subjects: 1H NMR spectroscopy; pharmaceuticals; dietary supplements; flavonol glycosides; terpen lactones, Спектроскопия ЯМР 1Н; лекарственные препараты; биологически активные добавки; флавоногликозиды; терпеновые лактоны
The composition of terpen lactones and flavonol glycosides of commercial preparation series based on ginkgo biloba extracts was explored by quantitative 1H NMR spectroscopy. The content of individual terpen lactones was determined using DMSO-d6 and acetone-d6 solvents. The structure effect of flavonol glycosides on the signal of the hydroxyl proton at position 5 of ring A was examined. A new approach of semi quantitative determination of flavonol glycosides amount by this signal, which is superposition of the singlets of individual flavonoids on the area from 12,5 to 12,65 ppm in DMSO-d6 solvent, was offered. The offered method can be used for detection of counterfeit ginkgo biloba extracts by cheap individual aglicones or rutin, because the signals of individual aglicones have different from flavonol glycosides chemical shifts.  
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