Pulsed ultraviolet light technology to improve egg safety, help poultry industry

January 13, 2021

Pulsed ultraviolet light can be an effective alternative to some of the antimicrobial technologies now used by the poultry industry to kill pathogens on eggshells, according to Penn State researchers, who simulated production conditions to test the technology.

Researcher Paul Patterson, professor of poultry science, College of Agricultural Sciences, suggests the technology has merit for commercial application in the egg industry.

"This study is unique because it scaled-up and applied components of standard egg processing to a conveyor and sanitizing eggs in a commercial setting," he said. "In the absence of water or other chemical sanitizers, this technology has the potential to achieve significant -- equal or greater -- microbial reductions than some currently available technologies."

Every year in the United States, an average of 287 eggs are consumed per person, and more than 14.1 billion eggs are set in hatchery incubators to produce chicks destined for the egg and meat bird industries. By reducing the microbial load on eggs, foodborne illness outbreaks associated with eggs and poultry meat can be reduced while chick health is maintained.

The egg industry currently uses sanitizers and detergents to decontaminate eggs and wash off any physical debris, while low-intensity ultraviolet light has been used as an additional antimicrobial step. However, pulsed ultraviolet light is more effective, explained lead researcher Josh Casser, doctoral candidate in animal science, because it delivers a higher intensity of ultraviolet light to the surface of the eggshell. That results in a greater microbial reduction in a shorter period of time than conventional ultraviolet light treatment.

In this study, the surfaces of shell eggs were inoculated with nonpathogenic bacteria strains used for research and were treated with pulsed ultraviolet light derived from a xenon flashlamp. Eggs were exposed on a modified egg-carrying conveyor that provided complete rotation of eggs under the flashlamp.

The novel conveyor devised for the experiment was instrumental in achieving acceptable decontamination, Casser noted, adding that the xenon flashlamps could be scaled up and customized for any commercial installation.

"As the egg rotates on its long axis along the way, the entire surface of the eggshell is exposed to the pulsed ultraviolet light energy, and the 27 seconds of exposure in our experiment resulted in an acceptable germicidal response," he said. "At three pulses per second, each egg is exposed to nearly 90 pulses, and each pulse has a duration of 360 microseconds -- an extremely short duration pulse."

The researchers, who recently published their results in Poultry Science, found that pulsed ultraviolet light treatment inactivated two different microbial strains, with greater energy resulting in a greater germicidal response.

The study also evaluated the effects of pulsed ultraviolet light treatment of hatching eggs on both embryo and chick growth. Using the same system, four batches of 125 fertile eggs were treated with the same and greater intensities of pulsed ultraviolet light. After processing, eggs were placed in a commercial incubator under normal incubation conditions.

There was no significant effect of the pulsed ultraviolet light treatment on percent fertility, hatchability or hatch. Also, there were no significant effects on post-hatch observations, including chick livability and average bird weight at hatch or at 42 days of age.

"Our research supports the application of pulsed ultraviolet light as an effective antimicrobial intervention for both table and hatching eggs," Cassar said. "If the egg industry embraces pulsed ultraviolet light technology and applies it in its processing operations, food safety would be improved because of the reduced pathogen presence on the surface of the eggs. And that matters because 9% of all foodborne illness in the U.S. is associated with eggs."

The technology is especially promising because it appears to have no negative consequences for the vital hatching-eggs component of the business, even at 10 times the UV-light intensity used in the table egg study, Patterson pointed out. Hatcheries produce the replacement stock for both the egg and broiler flocks of the poultry industry, including turkeys.

"Our research showed that there are no negative effects on hatching eggs and the embryos and chicks that are derived from those treated eggs," he said. "Using pulsed ultraviolet light before incubation in a hatchery setting would improve chick health, would avoid some of the financial constraints caused by poor chick quality resulting from chicks getting sick from early exposure to microbial pathogens, and potentially would improve the food safety of poultry meat."
Also involved in the research were Ed Mills, associate professor of meat science; Ali Demirci, professor of agricultural and biological engineering; and Lindsey Bright, undergraduate student in animal science and recipient of a College of Agricultural Sciences Undergraduate Research Award.

The U.S. Department of Agriculture's National Institute of Food and Agriculture partially supported this work. Hy-Line North America supplied the eggs used in this research, and Xenon Corp., of Wilmington, Massachusetts, provided technical assistance with the pulsed ultraviolet light technology.

Penn State

Related Food Safety Articles from Brightsurf:

USDA says current poultry food safety guidelines do not stop salmonella outbreaks
Current poultry food safety guidelines for Salmonella, the leading cause of foodborne illness outbreaks, are inadequate.

Food safety model may help pandemic management
No precedent exists for managing the COVID-19 pandemic - although a plan for working through major public food scares may point to the best ways of alerting and communicating with the public.

Food safety investments open new markets, boost revenue for small farmers
A new Cornell University study finds that when small-scale farmers are trained in food safety protocols and develop a farm food safety plan, new markets open up to them, leading to an overall gain in revenue.

Researchers print, tune graphene sensors to monitor food freshness, safety
Researchers are using high-resolution printing technology and the unique properties of graphene to make low-cost biosensors to monitor food safety and livestock health.

COVID-19 from food safety and biosecurity perspective
Most recently emerged pneumonia of unknown cause named COVID-19 has a devastating impact on public health and economy surpassing its counterparts in morbidity and mortality.

Amperometric sensors assist in analyzing food safety
Antioxidants are one of the most interesting and widely investigated compounds in life sciences due to their key role in the protection of living systems from the negative effects of free radicals.

Advancing frozen food safety: UGA evaluates environmental monitoring programs
Arlington, Va. - New research funded by the Frozen Food Foundation evaluates current environmental monitoring practices being implemented across the frozen food industry to prevent and control Listeria monocytogenes (Lm).

Advancing frozen food safety: Cornell develops novel food safety assessment tool
New research funded by the Frozen Food Foundation developed a modeling tool to assist the frozen food industry with understanding and managing listeriosis risks.

Computer program aids food safety experts with pathogen testing
Cornell University scientists have developed a computer program, Environmental Monitoring With an Agent-Based Model of Listeria (EnABLe), to simulate the most likely locations in a processing facility where the deadly food-borne pathogen Listeria monocytogenes might be found.

New graphene-based sensor design could improve food safety
In the US, more than 100 food recalls were issued in 2017 because of contamination from harmful bacteria such as Listeria, Salmonella or E. coli.

Read More: Food Safety News and Food Safety Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.