Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Raspberries – a better source of antioxidants

31.03.2006


Antioxidants are believed to have substantial health benefits and raspberries in particular are a good source. In fact, raspberries may have 10 times more antioxidants than tomatoes or broccoli. Further, raspberries contain some specific antioxidants that are found almost nowhere else.



In a study published in a recent issue of BioFactors, researchers from Plant Research International, Wageningen, The Netherlands, discuss specific compounds found in the berry, some appropriate methods for assaying the antioxidant concentration, and the biochemistry of antioxidant uptake in humans.

“Raspberries contain vitamin C and anthocanines,” says Jules Beekwilder, “but these can also be found in other products. However, approximately 50% of the antioxidant effect of raspberries is caused by ellagitannins. These you find in small doses in strawberries and practically nowhere else.” Some Chinese herbs may also be a source of these compounds.


The authors describe a special testing method for analyzing the antioxidant activity of raspberries. They point out that any beneficial effects will likely come from rapid chemical reactions between the antioxidant and the target molecule in the body. In a standard testing procedure, these rapid reactions may be missed, leading to confusing or conflicting results. By measuring these reactions in a 30-second window, a clearer picture of antioxidant capacity can be developed.

Because raspberries spoil rapidly, the study discusses the effect of storage and processing on the antioxidant content of the fruit. While flash freezing in liquid nitrogen and storage at -20°C destroys much of the vitamin C, the antioxidant capacity remains. Processing the berry into jams may alter some of the antioxidants, however most of the valuable compounds remain.

There is also some evidence that certain raspberry cultivars or varieties are higher in antioxidant capacity than others. The authors suggest that selective plant breeding could result in “extra healthy” raspberries, but that consumers tend to favor a better tasting and cheaper berry. According to Beekwilder and his colleagues, "It is clear that raspberry, like several other fruits and vegetables such as tomato, strawberry, kiwi and broccoli, represents a valuable contrasting source of potentially healthy compounds and can represent an important component of a balanced diet."

Astrid Engelen | alfa
Further information:
http://www.iospress.nl

More articles from Health and Medicine:

nachricht The genes are not to blame
20.07.2018 | Technische Universität München

nachricht Targeting headaches and tumors with nano-submarines
20.07.2018 | Universitätsmedizin der Johannes Gutenberg-Universität Mainz

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: Future electronic components to be printed like newspapers

A new manufacturing technique uses a process similar to newspaper printing to form smoother and more flexible metals for making ultrafast electronic devices.

The low-cost process, developed by Purdue University researchers, combines tools already used in industry for manufacturing metals on a large scale, but uses...

Im Focus: First evidence on the source of extragalactic particles

For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.

To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...

Im Focus: Magnetic vortices: Two independent magnetic skyrmion phases discovered in a single material

For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.

Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...

Im Focus: Breaking the bond: To take part or not?

Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.

A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...

Im Focus: New 2D Spectroscopy Methods

Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.

"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Leading experts in Diabetes, Metabolism and Biomedical Engineering discuss Precision Medicine

13.07.2018 | Event News

Conference on Laser Polishing – LaP: Fine Tuning for Surfaces

12.07.2018 | Event News

11th European Wood-based Panel Symposium 2018: Meeting point for the wood-based materials industry

03.07.2018 | Event News

 
Latest News

A smart safe rechargeable zinc ion battery based on sol-gel transition electrolytes

20.07.2018 | Power and Electrical Engineering

Reversing cause and effect is no trouble for quantum computers

20.07.2018 | Information Technology

Princeton-UPenn research team finds physics treasure hidden in a wallpaper pattern

20.07.2018 | Materials Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>