Featured Research

from universities, journals, and other organizations

Laser makes sure food is fresh

Date:
October 20, 2011
Source:
Lund University
Summary:
Minced meat, bread, fruit juice and many other foods are packaged in a protective gas which extends their shelf life. There is currently no good method to check whether the packaging has the correct gas content. However, researchers have now developed a new laser instrument which could solve the problem. The first product is expected to be ready for market launch later in the autumn.

Minced meat, bread, fruit juice and many other foods are packaged in a protective gas which extends their shelf life. There is currently no good method to check whether the packaging has the correct gas content. However, researchers in Atomic Physics and Packaging Logistics have developed a new laser instrument which could solve the problem. The first product is expected to be ready for market launch later in the autumn.

"It will be the first non-destructive method. This means that measurements can be taken in closed packaging and the gas composition over time can be checked. This will make it possible to check a much higher number of products than at present," says Mδrta Lewander, Doctor of Atomic Physics at Lund University in Sweden.

Dr Lewander developed the technique in her thesis and now works as chief technical officer for the company Gasporox, which is commercialising the technology.

Today, spot checks are performed on individual samples, with the risk that damaged products could slip through.

"We hope that, in the long term, this type of equipment could also help to stop people throwing so much food away, because they would know that it is packaged as it should be," she says.

The product that will be launched in the autumn could be used to check and improve how airtight packaging is. Gasporox estimates that within two years the method could also be used as a means of quality control in production when products are packaged. In the future, shops could also use it to check the shelf life of their goods.

No plastic packaging is 100% airtight. How easily oxygen can enter depends on both the material and how well sealed the packaging is.

"It has been shown that part-baked bread, for example, doesn't always meet the mark," says Annika Olsson, Professor of Packaging Logistics at Lund University.

The technology can measure through almost all packaging materials.

"As long as light can pass through then we can measure. Almost all materials allow at least some light to pass. Even packaging that contains aluminium foil, for example some fruit juice cartons, often has some part that is not covered by the foil," says Mδrta Lewander.

At Lund University, research in the field is continuing. Patrik Lundin, a doctoral student in Atomic Physics, is now focusing on measuring carbon dioxide in packaging.

"It is important to measure both oxygen and carbon dioxide. Oxygen is most important, but there is also interest in carbon dioxide from the industry," says Mδrta Lewander.

The development work has been financed by several research grants from bodies including Vinnova and by private entrepreneurs and investors. The product that is being developed by Gasporox is manufactured by a part-owner of the company, the Norwegian company Norsk Elektro Optikk.

How the technology works:

The protective atmosphere that surrounds the food product in the packaging usually comprises carbon dioxide or nitrogen and contains little or no oxygen. Oxygen leads to oxidisation, bacteria growth and decay. By shining a laser beam into the packaging and studying the light that comes back, it is possible to see if the composition of the gas is correct. The laser beam measures the amount of oxygen.

The laser is connected to a handheld unit which is held against the sample. A handheld detector measures the light that comes out of the packaging and sends a signal to a computer.

The technology is based on a technique for measuring the gas composition of samples containing cavities. An early application was to diagnose sinusitis, by enabling doctors at a primary health centre to find out whether the sinuses were full of gas as they should be. Clinical studies have confirmed that the technique works, and this application is expected to be on the market within a year or two.

Background:

The idea of using lasers to measure food packaging came about by chance, when Sune Svanberg, Professor of Atomic Physics at Lund University and the father of this laser technology, met Annika Olsson, then a Reader in Packaging Logistics, on a management course at Lund University a few years ago. When they told one another what they worked with, they began to brainstorm possible areas of collaboration. At the time, there was a fierce debate going on in Sweden on the repackaging of minced meat by a major supermarket chain.


Story Source:

The above story is based on materials provided by Lund University. Note: Materials may be edited for content and length.


Cite This Page:

Lund University. "Laser makes sure food is fresh." ScienceDaily. ScienceDaily, 20 October 2011. <www.sciencedaily.com/releases/2011/10/111020084821.htm>.
Lund University. (2011, October 20). Laser makes sure food is fresh. ScienceDaily. Retrieved July 25, 2014 from www.sciencedaily.com/releases/2011/10/111020084821.htm
Lund University. "Laser makes sure food is fresh." ScienceDaily. www.sciencedaily.com/releases/2011/10/111020084821.htm (accessed July 25, 2014).

Share This




More Matter & Energy News

Friday, July 25, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

TSA Administrator on Politics and Flight Bans

TSA Administrator on Politics and Flight Bans

AP (July 24, 2014) — TSA administrator, John Pistole's took part in the Aspen Security Forum 2014, where he answered questions on lifting of the ban on flights into Israel's Tel Aviv airport and whether politics played a role in lifting the ban. (July 24) Video provided by AP
Powered by NewsLook.com
Creative Makeovers for Ugly Cellphone Towers

Creative Makeovers for Ugly Cellphone Towers

AP (July 24, 2014) — Mobile phone companies and communities across the country are going to new lengths to disguise those unsightly cellphone towers. From a church bell tower to a flagpole, even a pencil, some towers are trying to make a point. (July 24) Video provided by AP
Powered by NewsLook.com
Algonquin Power Goes Activist on Its Target Gas Natural

Algonquin Power Goes Activist on Its Target Gas Natural

TheStreet (July 23, 2014) — When The Deal's Amanda Levin exclusively reported that Gas Natural had been talking to potential suitors, the Ohio company responded with a flat denial, claiming its board had not talked to anyone about a possible sale. Lo and behold, Canadian utility Algonquin Power and Utilities not only had approached the company, but it did it three times. Its last offer was for $13 per share as Gas Natural's was trading at a 60-day moving average of about $12.50 per share. Now Algonquin, which has a 4.9% stake in Gas Natural, has taken its case to shareholders, calling on them to back its proposals or, possibly, a change in the target's board. Video provided by TheStreet
Powered by NewsLook.com
Robot Parking Valet Creates Stress-Free Travel

Robot Parking Valet Creates Stress-Free Travel

AP (July 23, 2014) — 'Ray' the robotic parking valet at Dusseldorf Airport in Germany lets travelers to avoid the hassle of finding a parking spot before heading to the check-in desk. (July 23) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

    Health News

      Environment News

        Technology News



          Save/Print:
          Share:  

          Free Subscriptions


          Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

          Get Social & Mobile


          Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

          Have Feedback?


          Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
          Mobile iPhone Android Web
          Follow Facebook Twitter Google+
          Subscribe RSS Feeds Email Newsletters
          Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins