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  • Title: Carbon-13 CP-MAS nuclear magnetic resonance studies of teas.
    Author: Martínez-Richa A, Joseph-Nathan P.
    Journal: Solid State Nucl Magn Reson; 2003 May; 23(3):119-35. PubMed ID: 12763559.
    Abstract:
    13C CP-MAS NMR spectra of green and black tea were obtained and assigned based on the solid-state NMR spectra of tropolone, (+)-catechin hydrate, gallic acid, caffeine and flavone derivatives. The peak shape and chemical shifts observed for carbonyl carbons in CP-MAS spectra of teas indicate the existence of different chemical species, mainly free phenollic acids and ester derivatives of flavonoids. The peak patterns allow to establish differences between both teas.
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