Preparation of Epimers of Tea Catechins by Heat Treatment
スポンサーリンク
概要
- 論文の詳細を見る
Products from tea catechins ((+)-catechin, (-)-epicatechin, (-)-epigallocatechin, (-)-epicatechin gallate, and (-)-epigallocatechin gallate) after heat treatment were individually isolated by preparative HPLC and subsequent crysiallization. FAB-MS, elemental, ^1H- and ^<13>C-NMR, and optical rotation analyses indicated these products to be the C-2 epimers of the original catechins. The effects of temperature, time, pH, and concentration on this conversion of tea catechins to their epimers were examined. It was determined that the epimerization reaction should be conducted with 1% each of the tea catechin solution (pH 5) at 120℃ for 30 min.
- 社団法人日本農芸化学会の論文
- 1997-09-23
著者
-
HARA YUKIHIKO
Food Research Laboratories, Mitsui Norin Co., Ltd.
-
Nanjo Fumio
Food Research Laboratories, Mitsui Norin Co., Ltd.
-
Seto R
Tokyo Food Techno Co. Ltd. Shizuoka Jpn
-
Seto Ryota
Food Research Laboratories Tokyo Food Techno Co. Ltd
-
Nanjo Fumio
Food Research Laboratories Mitsui Norin Co. Ltd.
-
Hara Yukihiko
Food Research Institute Mitsui Norin Co. Ltd.
-
NAKAMURA Hironori
Food Research Laboratories, Mitsui Norin Co., Ltd.
-
Hara Y
Tokyo Food Techno Co. Ltd. Shizuoka Jpn
-
Nakamura Hironori
Food Research Laboratories Mitsui Norin Co. Ltd.
-
Nanjo Fumio
Food Res. Laboratories Mitsui Norin Co. Ltd.
-
Hara Yukihiko
Food Research Institute Mitsui Norin Co.
関連論文
- Identification of a Major Polyphenol and Polyphenolic Composition in Leaves of Camellia irrawadiensis
- Effect of components of green tea extracts, caffeine and catechins on hepatic drug metabolizing enzyme activities and mutagenic transformation of carcinogens
- Supplementation of Antioxidants Prevents Oxidative Stress during A Deep Saturation Dive
- Direct Evidence of Interaction of a Green Tea Polyphenol, Epigallocatechin Gallate, with Lipid Bilayers by Solid-state Nuclear Magnetic Resonance
- Interaction of Tea Catechins with Lipid Bilayers Investigayted with Liposome Systems
- Inhibitory Effects of 3-O-Acyl-(+)-catechins on Epstein-Barr Virus Activation
- Preparation of Epimers of Tea Catechins by Heat Treatment
- A Randomized Controlled Study on the Effects of Gargling with Tea Catechin Extracts on the Prevention of Influenza Infection in Healthy Adults
- Antifungal Activity fo Plant Extracts against Arthrinium sacchari and Chaetomium funicola
- Dietary Cycloinulooligosaccharides Enhance Intestinal Immunoglobulin A Production in Mice
- The Effects of Tea Catechins on Fecal Conditions of Elderly Residents in a Long-Term Care Facility
- Tumor Chemopreventive Effect of Orally Administered (-)-Epigallocatechin and Its 3-O-Acylated Derivatives on the Two Stage Mouse Skin Carcinogenesis Induced by Peroxynitrite and 12-O-Tetradecanoylphorbol-13-acetate
- Antiproliferative Activity of Some Catechins against Her2/neu-Overexpressing Human Breast Carcinoma SKBR3
- Inhibition of Collagenases from Mouse Lung Carcinoma Cells by Green Tea Catechins and Black Tea Theaflavins
- Radical Scavenging Activity of Tea Catechins and Their Related Compounds
- Apoptosis-inducing Activity of Polyphenol Compounds Derived from Tea Catechins in Human Histiolytic Lymphoma U937 Cells
- Reactivity of green tea catechins with formaldehyde
- Seasonal Fluctuations in Fructan Content and Related Enzyme Activities in Yacon (Polymnia sonchifolia)
- Isolation and Structural Analysis of Oligosaccharides from Yacon (Polymnia sonchifolia)
- Distribution of Carbohydrates and Related Enzyme Activities in Yacon : Polymnia sonchifolia
- The Inhibition of α-Amylase by Tea Polyphenols(Biological Chemistry)
- Methylation of Tea Catechins by Rat Liver Homogenates
- Effect of Black Tea Polyphenol on Plasma Lipids in Cholesterol-Fed Rats
- Inhibitory Effects of Tea Catechins, Black Tea Extract and Oolong Tea Extract on Hepatocarcinogenesis in Rat
- Absorption of Tea Catechins into Rat Portal Vein
- Effects of Oxygen on Nicotine and Tropane Alkaloid Production in Cultured Roots of Duboisia myoporoides
- Scopolamine Yield in Cultured Roots of Duboisia myoporoides Improved by a Novel Two-stage Culture Method
- Increase of Scopolamine Production by High Density Culture of Duboisia myoporoides Roots
- Tropane Alkaloid Production in Root Cultures of Duboisia myoporoides Obtained by Repeated Selection
- Inhibition of Rat Small Intestinal Sucrase and α-Glucosidase Activities by Tea Polyphenols
- Dietary Cycloinulooligosaccharides Enhance Intestinal Immunoglobulin A Production in Mice
- DIFFERENT DIVISION POTENTIALS OF EMBRYONIC CHICK CHONDROCYTES AND CARDIAC MUSCLE CELLS
- Excision-repair activity of green tea extracts in 4NQO-induced mutations of cultured Chinese hamster V79 cells
- The Effects of Green Tea Catechins (Polyphenon) on DL-Ethionine-Induced Acute Pancreatitis
- Reduction of Blood Glucose Levels by Tea Catechin
- Tumor Chemopreventive Effect of Orally Administered (-)-Epigallocatechin and Its 3-O-Acylated Derivatives on the Two Stage Mouse Skin Carcinogenesis Induced by Peroxynitrite and 12-O-Tetradecanoylphorbol-13-acetate
- Antiproliferative Activity of Some Catechins against Her2/neu-Overexpressing Human Breast Carcinoma SKBR3
- Effect of Black Tea Polyphenols on Plasma Lipids in Cholesterol-Fed Rats