Physicochemical analysis of theaflavins in black tea
| Project/Area Number |
25450174
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Food science
|
|---|
| Research Institution | Nippon Veterinary and Life Science University |
|---|
Principal Investigator |
Nakayama Tsutomu 日本獣医生命科学大学, 応用生命科学部, 教授 (50150199)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
ISHII Takeshi 神戸学院大学, 栄養学部, 准教授 (50448700)
NARAI Asako 日本獣医生命科学大学, 応用生命科学部, 講師 (00339475)
|
|---|
| Project Period (FY) |
2013-04-01 – 2016-03-31
|
| Project Status |
Completed (Fiscal Year 2015)
|
| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2013: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
|
|---|
| Keywords | テアフラビン類 / カテキン類 / HPLC / クーロアレイ検出器 / 過酸化水素 / 酸化還元電位 / 電気化学検出器 / 紅茶 / リン脂質 / 親和性 / ポリフェノール / 電気化学 / クーロアレイHPLC / 茶ポリフェノール / 抗酸化試験 / 抗酸化性 |
|---|
| Outline of Final Research Achievements |
A novel method to evaluate the redox properties of tea polyphenols such as catechins and theaflavins by HPLC-coulometric-array analysis was established. The quantity of electricity (C) on the vertical axis and the electric potential (V), adjusted with the associated palladium reference electrode, on the horizontal axis were plotted to provide “quantity versus potential (QP) plot”. The patterns of the plots correspond to the derivative of a hydrodynamic voltammogram or a current-voltage curve, with the electric potentials of the peaks in the QP plot corresponding to the half-wave potentials in the current-voltage curve. It was confirmed that catechins and theaflavins are oxidized depending on the electric potentials of their partial structures, and that all compounds showing a peak at 0 mV in the QP plots produce hydrogen peroxide during the autoxidation process.
|
Report
(4 results)
Research Products
(6 results)
-
-
[Journal Article] Structural specificity of electric potentials in the coulometric-array analysis of catechins and theaflavins2014
Author(s)
Matsuura, K., Usui, Y., Kan, T., Ishii, T., and Nakayama, T.
-
Journal Title
Journal of Clinical Biochemistry and Nutrition
Volume: 55
Issue: 2
Pages: 103-109
DOI
NAID
ISSN
0912-0009, 1880-5086
Related Report
Peer Reviewed / Open Access / Acknowledgement Compliant
-
-
-
[Presentation] Structural specificity of electric potentials in the coulometric-array analysis of catechins, methylated catechins and theaflavins2014
Author(s)
Nakayama, T., Matsuura, K., Usui, Y., Kan, T., and Ishii, T.
Organizer
27th International Conference on Polyphenols & 8th Tannin Conference
Place of Presentation
Nagoya University
Year and Date
2014-09-02 – 2014-09-06
Related Report
-
