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:12/2/2016)... ... 02, 2016 , ... Dr. Raffi Hovsepian, a leading plastic, ... 2016 “Guide to America’s Top Plastic Surgeons” for seven consecutive years. The prestigious ... experience, and professional associations. , One the most frequently honored surgeons in ...
(Date:12/2/2016)... ... December 02, 2016 , ... Universal Medical Systems, ... and the first company to offer robotic imaging to veterinary medicine is sponsoring ... # 941 for the American Association of Equine Practitioners 62nd Annual Convention from ...
(Date:12/2/2016)... ... December 02, 2016 , ... ... that it has raised $6.0 million in an initial round of funding. The ... that patients and their caregivers can receive far better care through the application ...
(Date:11/30/2016)... , ... November 30, 2016 , ... ... announce that we have been designated as a Cigna Infertility Center of Excellence. ... rigorous performance standards. , “It’s an honor to be designated a Cigna ...
(Date:11/30/2016)... ... 30, 2016 , ... Center For Discovery, a nationally recognized ... a new residential mental health treatment program in Chino Hills, California.  The California facility ... anxiety, depression, bi-polar disorder, and other related issues. , Center For Discovery is ...
Breaking Medicine News(10 mins):
(Date:11/30/2016)... Research and Markets has announced the addition of the ... report to their offering. ... , The cerebrospinal fluid (CSF) acts ... it is circulated though the brain and its ventricles, the spine and ... surrounding the brain changes significantly. As a result, ...
(Date:11/30/2016)... 30, 2016 Research and Markets has announced ... - MedCore" report to their offering. ... , , Detachable coil embolization ... vessel malformations. The detachable coil embolization treatment of cerebral aneurysms is less ... a weakened area in the wall of an artery in the brain. ...
(Date:11/30/2016)... PALO ALTO, Calif. , Nov. 30, 2016 /PRNewswire/ ... today announced it was named America,s Most JUST Company ... JUST Capital and Forbes magazine,s inaugural "JUST ... from one of the largest surveys ever conducted on ... last 18 months. This inaugural list ranks U.S companies ...
Breaking Medicine Technology: