Laser etching safe alternative for labeling grapefruit

November 3, 2009
This image shows laser etching on lemons and limes. Credit: Photo courtesy of Sunkist

Laser labeling of fruit and vegetables is a new, patented technology in which a low-energy carbon dioxide laser beam is used to label, or "etch" information on produce, thereby eliminating the need for common sticker-type labels. The technology has been licensed for use on a variety of fruits and vegetables and is being used in New Zealand, Australia, and Pacific Rim countries. It has been been approved in Asia, South Africa, Central and South America, Canada, and the European Union. The U.S. Food and Drug Administration (FDA) is in the final stages of approving the use of laser etching in the United States.

A research study aimed at investigating water loss, peel appearance, and potential decay in laser-labeled grapefruit was published recently in HortTechnology. "Little information is available on the impact of this new technology on the overall quality of labeled produce, especially its effect on water loss and decay during prolonged storage", said Dr. Ed Etxeberria, who headed the research team comprised of scientists from the University of Florida and the USDA Agricultural Research Service (USDA-ARS).

"In Florida, grapefruit represents 43% of the citrus fresh market. Grapefruit require extended storage, especially when transported to international destinations. This study determined the effects of laser labeling on water loss and decay susceptibility during prolonged storage", Etxeberria explained.

During commercial production, citrus is waxed before being labeled, packed, stored, and transported. Whereas common sticker-type labels do not deteriorate during storage, researchers postulated that water loss resulting from laser etching may distort the physical appearance of the fruit's surface, making it less effective and appealing. "The pinhole depressions applied after washing and waxing disrupt the natural cuticular barrier and the protective commercial wax cover, seemingly creating open cavities that would allow for increased water loss and facilitating the entrance of decay organisms. These etched surfaces can promote water loss and may increase the number of entry sites for decay-promoting organisms", the researchers said.

'Red Ruby' grapefruit that had been washed and waxed with carnuba containing 15 ppm thiabendazole (following established commercial practices) was used in the study. Water loss from etched surfaces was measured, and the effect of waxing on reducing water loss from etched fruit surfaces was investigated using nine different waxes. Laser-labeled fruit stored at 10 °C and two relative humidities (95% and 65%) for 5 weeks showed no increase in decay compared with nonetched control fruit, suggesting that laser labeling does not facilitate decay. This was confirmed by experiments where Penicillium digitatum spores were coated on fruit surfaces before and after etching. In either case, no decay was observed.

The researchers concluded that, when compared with sticker-labeled fruit, laser etching provides a relatively tamper-free labeling method, while "the fruit quality remains high as the invasion of the epidermis does not incite decay, provide an avenue for food pathogens, and water loss is easily controlled. The technology will offer the grapefruit industry a safe alternative to adhesive sticker labeling without enhancing decay susceptibility."

Source: American Society for Horticultural Science

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not rated yet Nov 03, 2009
I have always failed to understand why someone would want or need their fruit production to be labeled. What possible good can it achieve, the labels contain no real information of value other than a logo or brand name and branding fruit seems to go to the edge of consumer advertising stupidity.

Why not just include a cartboard cutout that can be posted up by the retailer, or whatever other form that is far less expensive or material and energy-consuming.
5 / 5 (1) Nov 03, 2009
the final piece of informaiton on a friut label is a 4 to 6 digit code. I have no idea what the code signifies but it may trace the fuit back to a region or specific farm in which case that knowledge would help in food bourne pathogen outbreaks.
not rated yet Nov 03, 2009
hmm never seen fruit labels that have a code on them, it's they seem pretty pointless to me, but I'll give you that, could be useful in tracking down fpos.
Nov 03, 2009
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not rated yet Nov 04, 2009
The purpose of the labels on the fruit is so the grocery chains can hire the lowest of the low to work at the checkout registers. These people, generally, don't speak English very well and have no clue what the heck they're selling. Then you have organic vs. good fruit and vegetables. You can always recognize the organic fruit because it full of bug bites and bruises vs. the beautiful good fruit.
not rated yet Nov 05, 2009
Now what I'd like to know is what happens when you etch before waxing instead of after.

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