茶叶的碳-13交叉极化-魔角旋转核磁共振研究

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

作者信息

Martínez-Richa Antonio, Joseph-Nathan Pedro

机构信息

Facultad de Química, Universidad de Guanajuato, Noria alta s/n, Gto 36050, Guanajuato, Mexico.

出版信息

Solid State Nucl Magn Reson. 2003 May;23(3):119-35. doi: 10.1016/S0926-2040(02)00017-6.

DOI:10.1016/S0926-2040(02)00017-6

PMID: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.

摘要

获得了绿茶和红茶的13C交叉极化-魔角旋转核磁共振（13C CP-MAS NMR）光谱，并根据托酚酮、（+）-儿茶素水合物、没食子酸、咖啡因和黄酮衍生物的固态核磁共振光谱进行了归属。茶叶CP-MAS光谱中羰基碳的峰形和化学位移表明存在不同的化学物质，主要是游离酚酸和黄酮类酯衍生物。峰型能够确定两种茶叶之间的差异。