Identification of two novel proanthocyanidins in green tea

被引：48

作者：

Lakenbrink, C

Engelhardt, UH

Wray, V

机构：

[1] Tech Univ Carolo Wilhelmina Braunschweig, Inst Lebensmittelchem, DE-38106 Braunschweig, Germany

[2] Gesell Biotechnol Forsch mbH, DE-38124 Braunschweig, Germany

来源：

JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY | 1999年 / 47卷 / 11期

关键词：

Camellia sinensis; tea; proanthocyanidins; HPLC/MS; NMR; epiafzelechingallate-(4 beta -> 8)-epicatechingallate; epiafzelechingallate-(4 beta -> 6)-epicatechingallate;

D O I：

10.1021/jf9813081

中图分类号：

S [农业科学];

学科分类号：

09 ;

摘要：

The isolation and structural elucidation of epiafzelechingallate-(4 beta-->8)-epicatechingallate (EAG-4 beta-->8-ECG) and epiafzelechingallate-(4 beta-->6)-epicatechingallate (EAG-4 beta-->6-ECG) in green tea samples are described. The combination of various 2D NMR techniques allowed a full structural determination of the underivatized proanthocyanidins even though broadening of the signals did not allow observation of some key correlations that characterize the location of the interflavonoid linkage. The differences in the NMR spectra of the new compounds allowed formulation of criteria for the discrimination between the 4-->6 and 4-->8 isomers in this type of compound.

引用

页码：4621 / 4624

页数：4

共 19 条

[1] EXTENSIVE HIGH-RESOLUTION REVERSE 2D NMR ANALYSIS FOR THE STRUCTURAL ELUCIDATION OF PROCYANIDIN OLIGOMERS [J].