Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Strong-flavored onions show promise for fighting cancer

21.10.2004


Strong-flavored onions can be harsh on your social life, but they’re potentially great for fighting cancer. Researchers at Cornell University have found, in preliminary lab studies, that members of the onion family with the strongest flavor — particularly New York Bold, Western Yellow and shallots — are the best varieties for inhibiting the growth of liver and colon cancer cells.



“No one knows yet how many daily servings of onions you’d have to eat to maximize protection against cancer, but our study suggests that people who are more health-conscious might want to go with the stronger onions rather than the mild ones,” says study leader Rui Hai Liu, M.D., Ph.D., a chemist with Cornell’s Department of Food Science in Ithaca, N.Y.

Researchers have known for some time that onions may help fight cancer, but the current study is believed to be the first to compare cancer-fighting abilities among commonly consumed onion varieties. The new study will appear in the Nov. 3 print issue of the Journal of Agricultural and Food Chemistry, a peer-reviewed journal of the American Chemical Society, the world’s largest scientific society.


Liu and his associates analyzed 10 common onion varieties and shallots for total antioxidant activity and their ability to fight the growth of cancer in human cell lines. Although shallots resemble onions, they are actually a separate, distinctive species. Fresh, uncooked samples were used, with extracts taken from the bulbs with the outer skin removed.

Shallots and onion varieties with the strongest flavor — Western Yellow, New York Bold and Northern Red — had the highest total antioxidant activity, an indication that they may have a stronger ability to destroy charged molecules called free radicals, an excess of which are thought to increase the risk of disease, particularly cancer, the researcher says.

Onion varieties with the mildest flavor — Empire Sweet, Western White, Peruvian Sweet, Mexico, Texas 1015, Imperial Valley Sweet and Vidalia — had the lowest total antioxidant activity, Liu says.

In tests against liver and colon cancer cells, onions were significantly better at inhibiting the growth of colon cancer cells than liver cancer cells, an indication that they are potentially better at fighting colon cancer, the researcher says. The strongest cancer-fighters tested were the New York Bold variety, Western Yellow and shallots. The sweetest tasting onions, including the beloved Vidalia, showed relatively little cancer-fighting ability, he notes.

Green onions and cocktail onions were not tested in this study, nor did the researcher test whether cooking made a difference in terms of cancer-fighting ability. Liu cautions that human studies are needed before any definitive links between onion consumption and cancer-prevention can be established.

While popular as fried “rings,” onions are known mostly for their ability to add flavor to a variety of food dishes, including meats, pizza, soups and salads. But they are increasingly becoming known for their potential health benefits. Onions are rich in a flavor compound known as quercetin, a potent antioxidant that has been linked to protection against cataracts and heart disease as well as cancer. They are also sodium, fat and cholesterol free.

Onions are the third-most consumed vegetable crop in the United States, with a per capita consumption estimated around 19 pounds per year and a retail value estimated at $3 billion to $4 billion, according to the National Onion Association.

Onions can be part of a healthy diet. The National Cancer Institute recommends eating at least five servings of fruits and vegetables a day.

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

More articles from Health and Medicine:

nachricht Cholesterol-lowering drugs may fight infectious disease
22.08.2017 | Duke University

nachricht Once invincible superbug squashed by 'superteam' of antibiotics
22.08.2017 | University at Buffalo

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: Fizzy soda water could be key to clean manufacture of flat wonder material: Graphene

Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.

As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...

Im Focus: Exotic quantum states made from light: Physicists create optical “wells” for a super-photon

Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.

Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...

Im Focus: Circular RNA linked to brain function

For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.

While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...

Im Focus: RAVAN CubeSat measures Earth's outgoing energy

An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.

The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...

Im Focus: Scientists shine new light on the “other high temperature superconductor”

A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.

Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Call for Papers – ICNFT 2018, 5th International Conference on New Forming Technology

16.08.2017 | Event News

Sustainability is the business model of tomorrow

04.08.2017 | Event News

Clash of Realities 2017: Registration now open. International Conference at TH Köln

26.07.2017 | Event News

 
Latest News

What the world's tiniest 'monster truck' reveals

23.08.2017 | Life Sciences

Treating arthritis with algae

23.08.2017 | Life Sciences

Witnessing turbulent motion in the atmosphere of a distant star

23.08.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>