Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Suntans are bad for bacteria too! Exposure to UV irradiation kills off harmful bacteria in food

15.12.2003


Research news from the Journal of the Science of Food and Agriculture



15 December 2003: The presence of E.coli bacteria, found in foods such as egg white and apple juice, is a major public health concern. The bacteria have, in the past, been inactivated by heat pasteurisation -- which can affect flavour and consistency. New evidence published in the Journal of Science of Food and Agriculture, however, suggests that UV irradiation may prove to be a better and more cost effective method of eliminating the risks posed by E. coli bacteria.

Researchers working in Canada discovered that an optimal UV irradiation system can be developed for individual food products, taking into account the UV transmittance of each product. With the optimal fluid depth and UV dose, significant decrease in active E. coli bacteria was observed in both apple juice and liquid egg white.


The UV rays inactivate E. coli bacteria by degrading their cell walls and DNA. These rays can be produced by high intensity fluorescent lamps, which are both cheap and readily available, making this method extremely efficient. The researchers also found that, in direct contrast to pasteurisation, the sensory quality of the food products following irradiation was not compromised, and that inactivation of the bacteria lasted for the entire shelf life of the product.

“UV irradiation offers a relatively inexpensive and effective means of inactivating some of the serious bacteria in food products,” says Dr Michael Ngadi, co-author of the study. “We are able to design and operate systems that can process liquid products to satisfy regulatory requirements. The wonderful thing is that products can be processed at lower temperatures and therefore the fresh-like quality of the product can be maintained.”

Jaida Harris | alfa
Further information:
http://www.interscience.wiley.com/jsfa
http://www.soci.org
http://www.wileyeurope.com

More articles from Agricultural and Forestry Science:

nachricht Cascading use is also beneficial for wood
11.12.2017 | Technische Universität München

nachricht The future of crop engineering
08.12.2017 | Max-Planck-Institut für Biochemie

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: First-of-its-kind chemical oscillator offers new level of molecular control

DNA molecules that follow specific instructions could offer more precise molecular control of synthetic chemical systems, a discovery that opens the door for engineers to create molecular machines with new and complex behaviors.

Researchers have created chemical amplifiers and a chemical oscillator using a systematic method that has the potential to embed sophisticated circuit...

Im Focus: Long-lived storage of a photonic qubit for worldwide teleportation

MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.

Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...

Im Focus: Electromagnetic water cloak eliminates drag and wake

Detailed calculations show water cloaks are feasible with today's technology

Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...

Im Focus: Scientists channel graphene to understand filtration and ion transport into cells

Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.

To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...

Im Focus: Towards data storage at the single molecule level

The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.

Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

AKL’18: The opportunities and challenges of digitalization in the laser industry

07.12.2017 | Event News

 
Latest News

Engineers program tiny robots to move, think like insects

15.12.2017 | Power and Electrical Engineering

One in 5 materials chemistry papers may be wrong, study suggests

15.12.2017 | Materials Sciences

New antbird species discovered in Peru by LSU ornithologists

15.12.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>