Featured Research

from universities, journals, and other organizations

Green Tea Shows Antioxidant Benefits In Human Plasma

Date:
October 14, 1999
Source:
American Chemical Society
Summary:
Substances in green tea known as catechins can increase the antioxidant capacity of human plasma, which could help reduce cardiovascular disease risk, according to work published by Japanese researchers in the October issue of the Journal of Agricultural and Food Chemistry.

Finding suggests regular consumption could help reduce cardiovascular disease risk

Washington, D.C., October 12, 1999 -- Substances in green tea known as catechins can increase the antioxidant capacity of human plasma, which could help reduce cardiovascular disease risk, according to work published by Japanese researchers in the October issue of the Journal of Agricultural and Food Chemistry. The journal is a peer-reviewed publication of the American Chemical Society, the world's largest scientific society.

"We believe we have shown for the first time the course change of both green tea catechin levels in human plasma as well as human plasma lipid peroxide levels after oral green tea catechin supplementation, " said Teruo Miyazawa, Ph.D., biodynamic chemistry professor at the Tohoku University Graduate School of Life Science and Agriculture and the study's principal investigator.

Green tea is a very popular beverage in Japan and throughout many parts of the world. It has been linked in other studies to possible lowered risks from several forms of cancer

In the study, 18 healthy male subjects between the ages of 23 and 41 ingested green tea extracts in tablet form (including 254 milligrams of catechins per subject - one cup of green tea contains about 100 to 150 milligrams of catechin). All of the subjects avoided tea and tea-related beverages for 12 hours prior to the testing. Blood samples were taken one hour before and after the catechin ingestion.

Testing following the ingestion showed that catechin was incorporated into the subjects' plasma and that their phosphatidylcholine hydroperoxide (PC-OOH, a recognized marker of oxidative injury of plasma lipoproteins) levels were lowered as well. Plasma lipoprotein oxidation is generally recognized to be an important step in the formation of atherosclerotic plaques and subsequent cardiovascular disease, so lowered PC-OOH levels suggest a lowered risk of cardiovascular disease.

Miyazawa said two methodologies previously tested by his group allowed for a highly sensitive as well as a highly selective way to determine both plasma catechin and lipid peroxide levels, and that the findings certainly merit further consideration and study, given the worldwide prevalence of cardiovascular disease.

Miyazawa's study colleagues were: Kiyotaka Nakagawa, also of the Tohoku University Graduate School of Life Science and Agriculture; Manabu Ninomiya, Tsutomu Okubo, Nobuyuki Aoi, Lekh Raj Juneja, and Mujo Kim of the Taiyo Kagaku Company; and, Kenji Yamanaka, of the Sasakawa Clinic of Gastroenterology.

###

A nonprofit organization with a membership of nearly 159,000 chemists and chemical engineers, the American Chemical Society publishes scientific journals and databases, convenes major research conferences, and provides educational, science policy and career programs in chemistry. Its main offices are in Washington, D.C., and Columbus, Ohio. (http://www.acs.org)


Story Source:

The above story is based on materials provided by American Chemical Society. Note: Materials may be edited for content and length.


Cite This Page:

American Chemical Society. "Green Tea Shows Antioxidant Benefits In Human Plasma." ScienceDaily. ScienceDaily, 14 October 1999. <www.sciencedaily.com/releases/1999/10/991014075533.htm>.
American Chemical Society. (1999, October 14). Green Tea Shows Antioxidant Benefits In Human Plasma. ScienceDaily. Retrieved August 30, 2014 from www.sciencedaily.com/releases/1999/10/991014075533.htm
American Chemical Society. "Green Tea Shows Antioxidant Benefits In Human Plasma." ScienceDaily. www.sciencedaily.com/releases/1999/10/991014075533.htm (accessed August 30, 2014).

Share This




More Health & Medicine News

Saturday, August 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

3 Things To Know About The Ebola Outbreak's Progression

3 Things To Know About The Ebola Outbreak's Progression

Newsy (Aug. 29, 2014) Here are three things you need to know about the deadly Ebola outbreak's progression this week. Video provided by Newsy
Powered by NewsLook.com
Killer Amoeba Found in Louisiana Water System

Killer Amoeba Found in Louisiana Water System

AP (Aug. 28, 2014) State health officials say testing has confirmed the presence of a killer amoeba in a water system serving three St. John the Baptist Parish towns. (Aug. 28) Video provided by AP
Powered by NewsLook.com
Who Could Be Burnt by WHO's E-Cigs Move?

Who Could Be Burnt by WHO's E-Cigs Move?

Reuters - Business Video Online (Aug. 28, 2014) The World Health Organisation has called for the regulation of electronic cigarettes as both tobacco and medical products. Ciara Lee looks at the impact of the move on the tobacco industry. Video provided by Reuters
Powered by NewsLook.com
CDC Director On Ebola Outbreak: 'It's Worse Than I Feared'

CDC Director On Ebola Outbreak: 'It's Worse Than I Feared'

Newsy (Aug. 28, 2014) CDC director Tom Frieden says the Ebola outbreak is even worse than he feared. But he also said there's still hope to contain it. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins