Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Cornell researchers turn conventional thinking about canned corn on its ear

08.08.2002


Canned corn may be healthier for you than corn on the cob, according to a study by Cornell University scientists. The researchers say that heat processing of sweet corn significantly raises the level of naturally occurring compounds that help fight disease.


The findings are reported in the August 14 issue of the Journal of Agricultural and Food Chemistry, a peer-reviewed publication of the American Chemical Society, the world’s largest scientific society.

Sweet corn is the number-two processed vegetable in the United States, second only to tomatoes, according to Rui Hai Liu, M.D., Ph.D., assistant professor of food science at Cornell University and lead author of the paper.

The study shows that heat processing of sweet corn, which is how canned corn is prepared, increases both total antioxidant activity and the level of phenolics -- a naturally occurring type of phytochemical found in many fruits and vegetables. Heating sweet corn, whether it is on the cob, in a casserole, or in the can, enhances its beneficial compounds, Liu noted.



Processing at 115 degrees Celsius for 25 minutes elevated total phenolics by 32 percent, with ferulic acid -- the predominant phenolic compound in sweet corn -- increasing by 550 percent.

"It’s conventional wisdom that processed fruits and vegetables have lower nutritional value than sweet fresh produce," Liu said. This is because processing leads to a decrease in vitamin C -- an antioxidant that prevents cell and tissue damage and purportedly gives fruits and vegetables their disease-preventing abilities.

But Liu’s ongoing investigation of fruits and vegetables contradicts conventional wisdom.

In one study, published two years ago in Nature, Liu and his team found that less than 0.4 percent of an apple’s antioxidant activity comes from vitamin C. Instead, a combination of phytochemicals supplies the antioxidants in apples. This led Liu to suspect that processed fruits and vegetables might actually maintain their antioxidant activity despite the loss of vitamin C.

Earlier this year, in another study published in the Journal of Agricultural and Food Chemistry, the researchers reported more evidence that processing is beneficial. They found that cooking tomatoes triggers a rise in total antioxidant activity, chiefly due to an increase in lycopene -- a phytochemical that makes tomatoes red.

The findings are obviously good for the processing industry, Liu said, but they are also good for the consumer: "It doesn’t matter if it’s raw; it doesn’t matter if it’s cooked; it doesn’t matter if it’s fresh; it doesn’t matter if it’s processed. You simply need to eat a variety of fruits and vegetables to get maximum health benefits."


Liu’s coauthors were Cornell graduate student Veronica Dewanto and a visiting fellow in Liu’s laboratory, Xianzhong Wu. The research was funded by Cornell University and the United States Department of Agriculture’s Federal Formula Fund.

Beverly Hassell | EurekAlert!
Further information:
http://www.acs.org/portal/Chemistry

More articles from Agricultural and Forestry Science:

nachricht New research recovers nutrients from seafood process water
31.10.2018 | Chalmers University of Technology

nachricht Plant Hormone Makes Space Farming a Possibility
17.10.2018 | Universität Zürich

All articles from Agricultural and Forestry Science >>>

The most recent press releases about innovation >>>

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

Im Focus: UNH scientists help provide first-ever views of elusive energy explosion

Researchers at the University of New Hampshire have captured a difficult-to-view singular event involving "magnetic reconnection"--the process by which sparse particles and energy around Earth collide producing a quick but mighty explosion--in the Earth's magnetotail, the magnetic environment that trails behind the planet.

Magnetic reconnection has remained a bit of a mystery to scientists. They know it exists and have documented the effects that the energy explosions can...

Im Focus: A Chip with Blood Vessels

Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.

Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...

Im Focus: A Leap Into Quantum Technology

Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.

In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...

Im Focus: Research icebreaker Polarstern begins the Antarctic season

What does it look like below the ice shelf of the calved massive iceberg A68?

On Saturday, 10 November 2018, the research icebreaker Polarstern will leave its homeport of Bremerhaven, bound for Cape Town, South Africa.

Im Focus: Penn engineers develop ultrathin, ultralight 'nanocardboard'

When choosing materials to make something, trade-offs need to be made between a host of properties, such as thickness, stiffness and weight. Depending on the application in question, finding just the right balance is the difference between success and failure

Now, a team of Penn Engineers has demonstrated a new material they call "nanocardboard," an ultrathin equivalent of corrugated paper cardboard. A square...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

“3rd Conference on Laser Polishing – LaP 2018” Attracts International Experts and Users

09.11.2018 | Event News

On the brain’s ability to find the right direction

06.11.2018 | Event News

European Space Talks: Weltraumschrott – eine Gefahr für die Gesellschaft?

23.10.2018 | Event News

 
Latest News

Purdue cancer identity technology makes it easier to find a tumor's 'address'

16.11.2018 | Health and Medicine

Good preparation is half the digestion

16.11.2018 | Life Sciences

Microscope measures muscle weakness

16.11.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>