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New Test For More Reliable Product Expiration Labels

Date:
June 26, 2008
Source:
American Chemical Society
Summary:
Beer gets a "skunky" taste. Wine develops an unpleasant flavor termed "light-struck." And exposure to light causes off flavors, colors, and aromas in hundreds of other foods and beverages and decreases shelf life.

Researchers have developed a new, more reliable test for predicting the shelf-life of light-sensitive food and drink products.
Credit: Courtesy of public-domain-photos.com

Beer gets a "skunky" taste. Wine develops an unpleasant flavor termed "light-struck." And exposure to light causes off flavors, colors, and aromas in hundreds of other foods and beverages and decreases shelf life.

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Now, researchers in Italy report development of a more reliable method for predicting shelf-life that accounts for light sensitivity for the first time and may help consumers choose fresher, tastier food products. Their study is scheduled for the June 25 issue of ACS' Journal of Agricultural and Food Chemistry, a bi-weekly publication.

In the new study, Lara Manzocco and colleagues note that the bright, intense light of retail displays is widely known to cause the formation of off-flavors, loss of nutrients, and color fading in food and beverages. But conventional methods to test the shelf-life of these products focus on the effect of heat and ignore the effect of light, leading to underestimations in shelf-life shown on product expiration labels. A more reliable test is needed, the researchers say.

The scientists exposed a soft drink containing saffron, which contains light-sensitive substances, to different levels of light at increasing temperatures. They found that the beverage grew lighter in color as light intensity increased, confirming that light can cause a dramatic decrease in beverage quality. Based on these observations, the scientists developed a new mathematical model that measures light-sensitivity as well as temperature to provide a more reliable method for predicting shelf-life.


Story Source:

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


Journal Reference:

  1. Manzocco, Lara, Kravina, Giuditta, Calligaris, Sonia, and Nicoli, Maria Cristina. Shelf Life Modeling of Photosensitive Food: The Case of Colored Beverages. J. Agric. Food Chem., Web Release Date: June 6, 2008 DOI: 10.1021/jf800072u

Cite This Page:

American Chemical Society. "New Test For More Reliable Product Expiration Labels." ScienceDaily. ScienceDaily, 26 June 2008. <www.sciencedaily.com/releases/2008/06/080623093249.htm>.
American Chemical Society. (2008, June 26). New Test For More Reliable Product Expiration Labels. ScienceDaily. Retrieved November 24, 2014 from www.sciencedaily.com/releases/2008/06/080623093249.htm
American Chemical Society. "New Test For More Reliable Product Expiration Labels." ScienceDaily. www.sciencedaily.com/releases/2008/06/080623093249.htm (accessed November 24, 2014).

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