Navigation Links
Cooling system may build eggs' natural defenses against salmonella
Date:6/21/2011

WEST LAFAYETTE, Ind. - Once eggs are laid, their natural resistance to pathogens begins to wear down, but a Purdue University scientist believes he knows how to rearm those defenses.

Kevin Keener, an associate professor of food science, created a process for rapidly cooling eggs that is designed to inhibit the growth of bacteria such as salmonella. The same cooling process would saturate the inside of an egg with carbon dioxide and alter pH levels, which he has found are connected to the activity of an enzyme called lysozyme, which defends egg whites from bacteria.

"This enzyme activity is directly related to the carbon dioxide and pH levels," said Keener, whose results were published in the journal Poultry Science. "An increase in lysozyme would lead to increased safety in eggs."

Freshly laid eggs are saturated with carbon dioxide and have pH levels of about 7. Over time, the pH level rises to 9 and carbon dioxide escapes, Keener said. As that happens, lysozyme becomes less active.

Keener saturated purified egg white lysozymes with carbon dioxide and tested different pH levels. He found that at both high and low pH levels, the addition of carbon dioxide would increase lysozyme activity by as much as 50 percent.

The cooling process Keener developed would create the same conditions, he said.

"When we cool the eggs, carbon dioxide is sucked inside the shell," Keener said. "We're able to resaturate the white of the egg with carbon dioxide, returning it to that original condition when the chicken laid it."

The additional lysozyme activity would give eggs more time to self-eliminate harmful bacteria.

Keener's cooling technology uses carbon dioxide "snow" to rapidly lower the eggs' temperature. Eggs are placed in a cooling chamber and carbon dioxide gas at about minus 110 degrees Fahrenheit is generated. The cold gas is circulated around the eggs and forms a thin layer of ice inside the eggshell. After treatment, the ice layer melts and quickly lowers an egg's internal temperature to below 45 degrees Fahrenheit. The eggshell does not crack during this process because it can resist expansion from a thin ice layer.

Keener said Food and Drug Administration studies show that if eggs were cooled and stored at 45 degrees or less within 12 hours of laying, there would be an estimated 100,000 fewer salmonella illnesses from eggs in the United States each year.

Keener will continue to study the molecular changes that occur with egg cooling.


'/>"/>

Contact: Brian Wallheimer
bwallhei@purdue.edu
765-496-2050
Purdue University
Source:Eurekalert  

Related medicine news :

1. Cooling inflammation for healthier arteries
2. Colorful brains, cooling lasers, disease-detecting lights and more
3. Cooling may benefit children after cardiac arrest
4. Cooling the brain during sleep may be a natural and effective treatment for insomnia
5. Sleeptime Head-Cooling Cap Eases Insomnia, Study Finds
6. Carolinas HealthCare System Volunteers to Join Navy Rescue Mission in Haiti
7. University of Virginia Health System Medical Laboratories Selects Sunquest's Specimen Collection Solution
8. Silverchair Learning Systems Enhances Product Expertise with New Hires
9. Centene Corporation Hosts Medical Management Systems Update in New York City
10. U.S. National Guard Connects Nationwide with Desktop Alert's Command and Control Mass Notification Systems and Common Alerting Protocol (CAP)
11. Swine Flu vaccination: voluntary system works
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Cooling system may build eggs' natural defenses against salmonella
(Date:9/26/2017)... ... September 26, 2017 , ... The 2017 American Academy of Cosmetic Surgery ... Fat,” revealed not only the latest about cosmetic procedures to remove and replace fat, ... cosmetic medicine. , “Fat really is magical, especially when it comes to the cosmetic ...
(Date:9/26/2017)... ... September 26, 2017 , ... “Good Morning Sunshine!: Finding Strength and Comfort in ... Morning Sunshine!: Finding Strength and Comfort in God” is the creation of published author, ... Sate University, who has worked at a local mental health center for over twenty ...
(Date:9/26/2017)... ... September 26, 2017 , ... “Sonflower Submission”: a ... nature to the inevitable destinations of negativity, complaining and the need to always be ... take effect in order for a lesson in stress-less living to be learned. ...
(Date:9/26/2017)... ... 2017 , ... Time out for Daddy is a moving story of a ... grownups make mistakes. “Time Out for Daddy” is the creation of published author Debra ... whose passion for children inspired her to write this book. , Published by Christian ...
(Date:9/25/2017)... ... September 25, 2017 , ... The ... the addition of an affiliate in Minneapolis-St. Paul, MN, Dr. Adam Locketz. Dr. ... Naltrexone therapy and aftercare planning through his Timewise Medical practice in the twin ...
Breaking Medicine News(10 mins):
(Date:9/25/2017)... Sept. 25, 2017  EpiVax, Inc., a leader ... and immune-engineering today announced the launch of EpiVax ... of personalized therapeutic cancer vaccines. EpiVax has provided ... access to enabling technologies to the new precision ... lead EpiVax Oncology as Chief Executive Officer. Gad ...
(Date:9/22/2017)...  As the latest Obamacare repeal effort moves is ... (R-LA) and Lindsey Graham (R-SC) medical device ... industry is in an odd place.  The industry wants ... tax on medical device sales passed along with the ... increased visits and hospital customers with the funding to ...
(Date:9/19/2017)... venture-backed medical device company developing a non-invasive, robotically assisted, platform therapy that uses pulsed sound ... ... Jim Bertolina, PhD ... Tom Tefft ... device executive Josh Stopek , PhD, who has led R&D and business development teams ...
Breaking Medicine Technology: