Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

New cholesterol fighter found in red wine

09.09.2003


Scientists have known for some time that red wine is healthy for the heart. Now, they have found evidence that provides yet another explanation for this effect.



Scientists at the University of California, Davis, have identified another group of chemicals in red wine that is linked to the ability to lower cholesterol. Called saponins, these glucose-based plant compounds are being found in an increasing number of foods. This is the first time they’ve been found in wine, says Andrew Waterhouse, Ph.D., Professor of Enology (wine chemistry) at the University of California, Davis.

His finding was described today at the 226th national meeting of the American Chemical Society, the world’s largest scientific society.


For the most part, the so-called French Paradox — the association between red wine and decreased heart disease — has been attributed to resveratrol, a compound found in grapes, which acts as an antioxidant. But saponins could be just as important.

"Saponins are a hot new food ingredient. People are just starting to pay attention to it," says study leader Waterhouse. "No one ever thought to look for it in wine."

The compounds are believed to come from the waxy skin of grapes, which dissolve into the wine during its fermentation process. To better understand their distribution in wine, Waterhouse conducted a preliminary study of six varieties of California wines — four red and two white — and compared them on the basis of their saponin content.

"Average dietary saponin intake has been estimated at 15 mg, while one glass of red has a total saponin concentration of about half that, making red wine a significant dietary source," the researcher says.

In general, Waterhouse found that red wine contains significantly higher saponin levels than white — about three to ten times as much. Among the red wines tested, red Zinfandel contained the highest levels. Syrah had the second highest, followed by Pinot noir and Cabernet Sauvignon, which had about the same amount. The white varieties tested, Sauvignon blanc and Chardonnay, contained much less.

Although Merlot was not analyzed in this study, Waterhouse believes it contains significant amounts of saponins at levels comparable to the other red wines.

The study also seems to show a positive correlation between alcohol content and saponin levels. The red Zinfandel tested, which contained the highest level of saponins among all the wines tested, also had the highest level of alcohol, at 16 percent. "We think that alcohol may make the saponins more soluble in wine, but follow up studies are needed," says Waterhouse, who is considered an expert on wine chemistry.

According to Waterhouse, red wines contain about the same amount of saponin as they do resveratrol. But while resveratrol is thought to block cholesterol oxidation by its antioxidant action, saponins are believed to work by binding to and preventing the absorption of cholesterol, he says. He also mentioned that saponins are known to affect inflammation pathways, an effect that could have implications in heart disease and cancer, according to published studies.

Besides wine, other foods containing significant amounts of saponins include olive oil and soybeans. The compounds are even more abundant in desert plants such as the Yucca and Quillaja. For the most part, saponins make up the waxy coating of these plants, where they function primarily for protection.

The University of California-Davis provided funding for this study.


###
The poster on this research, AGFD 79, will be presented at 8:00 p.m. on Monday, Sept. 8, at the Javits Convention Center, North Pavillion, during the "Sci-Mix" symposium.

Andrew L. Waterhouse, Ph.D., is Professor of Enology at the University of California, Davis.

Michael Bernstein | EurekAlert!
Further information:
http://www.acs.org/

More articles from Health and Medicine:

nachricht 'Living bandages': NUST MISIS scientists develop biocompatible anti-burn nanofibers
16.02.2018 | National University of Science and Technology MISIS

nachricht New process allows tailor-made malaria research
16.02.2018 | Eberhard Karls Universität Tübingen

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Demonstration of a single molecule piezoelectric effect

Breakthrough provides a new concept of the design of molecular motors, sensors and electricity generators at nanoscale

Researchers from the Institute of Organic Chemistry and Biochemistry of the CAS (IOCB Prague), Institute of Physics of the CAS (IP CAS) and Palacký University...

Im Focus: Hybrid optics bring color imaging using ultrathin metalenses into focus

For photographers and scientists, lenses are lifesavers. They reflect and refract light, making possible the imaging systems that drive discovery through the microscope and preserve history through cameras.

But today's glass-based lenses are bulky and resist miniaturization. Next-generation technologies, such as ultrathin cameras or tiny microscopes, require...

Im Focus: Stem cell divisions in the adult brain seen for the first time

Scientists from the University of Zurich have succeeded for the first time in tracking individual stem cells and their neuronal progeny over months within the intact adult brain. This study sheds light on how new neurons are produced throughout life.

The generation of new nerve cells was once thought to taper off at the end of embryonic development. However, recent research has shown that the adult brain...

Im Focus: Interference as a new method for cooling quantum devices

Theoretical physicists propose to use negative interference to control heat flow in quantum devices. Study published in Physical Review Letters

Quantum computer parts are sensitive and need to be cooled to very low temperatures. Their tiny size makes them particularly susceptible to a temperature...

Im Focus: Autonomous 3D scanner supports individual manufacturing processes

Let’s say the armrest is broken in your vintage car. As things stand, you would need a lot of luck and persistence to find the right spare part. But in the world of Industrie 4.0 and production with batch sizes of one, you can simply scan the armrest and print it out. This is made possible by the first ever 3D scanner capable of working autonomously and in real time. The autonomous scanning system will be on display at the Hannover Messe Preview on February 6 and at the Hannover Messe proper from April 23 to 27, 2018 (Hall 6, Booth A30).

Part of the charm of vintage cars is that they stopped making them long ago, so it is special when you do see one out on the roads. If something breaks or...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

2nd International Conference on High Temperature Shape Memory Alloys (HTSMAs)

15.02.2018 | Event News

Aachen DC Grid Summit 2018

13.02.2018 | Event News

How Global Climate Policy Can Learn from the Energy Transition

12.02.2018 | Event News

 
Latest News

Fingerprints of quantum entanglement

16.02.2018 | Information Technology

'Living bandages': NUST MISIS scientists develop biocompatible anti-burn nanofibers

16.02.2018 | Health and Medicine

Hubble sees Neptune's mysterious shrinking storm

16.02.2018 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>