Carbon-13 CP-MAS nuclear magnetic resonance studies of teas

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 exi...

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Bibliographic Details
Published inSolid state nuclear magnetic resonance Vol. 23; no. 3; pp. 119 - 135
Main Authors Martı́nez-Richa, Antonio, Joseph-Nathan, Pedro
Format Journal Article
LanguageEnglish
Published Netherlands Elsevier Inc 01.05.2003
Subjects
Biflavonoids
Camellia sinensis - chemistry
Camellia sinensis - classification
Carbon Isotopes
Carbon Radioisotopes
Catechin
Flavonoids - chemistry
Green and black tea
Models, Molecular
Molecular modeling
Nuclear Magnetic Resonance, Biomolecular - methods
Phenols - chemistry
Plant Leaves - chemistry
Plant Leaves - classification
Polymers - chemistry
Polyphenols
Species Specificity
Tea - chemistry
Tea - classification
Tropolone - chemistry
Polyphenols
Catechin
Green and black tea
Molecular modeling
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Summary: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.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0926-2040
1527-3326
DOI:10.1016/S0926-2040(02)00017-6