Preparation of Silica Adsorbents Containing Beta-Cyclodextrin and Their Use in the Separation and Purification of Catechins from Green Tea Powders
| Autor: | Bing-Hao Huang, 黃炳豪 |
|---|---|
| Rok vydání: | 2010 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 98 Green tea is recognized for its high content of tea polyphenols, in particular tea catechins. The four represented catechins in green tea are, epigallocatechin (EGC), epicatechin (EC), epigallocatechin gallate (EGCG), and epicatechin gallate (ECG). Among these four major compounds, EGCG is the most abundant and biologically active compound in green tea. Many researches in the past found that green tea polyphenols have physiological effects in anti-oxidant, anti-tumorgenic, anti-mutagenic, anti-pathogenic, anti-inflammation, and anti-fungus, etc. Many health foods and products containing green tea polyphenols are already in markets, such as toiletries, cosmetics, foods, and beverages. In this study, the optimal techniques for preparation of silica adsorbents containing β-cyclodextrin (β-CD) and their use in column chromatography were investigated. The objective is to enhance the adsorption selectivity of EGCG and then effectively separate and purify caffeine (CA) and each of the four catechins from green tea extracts. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|