HOME >> BIOLOGY >> NEWS
Focusing on preservatives: How they keep food fresh

What keeps golden raisins golden? Sulfur dioxide. What is sulfur dioxide? A preservative. What do preservatives do? They keep foods fresh and inhibit the growth of bacteria, yeasts or molds.

Everyone has heard about food preservatives, but how do they work? Chemical & Engineering News, in the Nov. 11 issue, explains what these useful chemicals can do to keep food safe and palatable. Chemical preservatives can't take the place of stronger preservation methods, like commercial sterilization, which kills most bacteria and enzymes, but they can be used effectively to retard spoiling and to stop the growth of harmful microorganisms.

Chemical & Engineering News is a weekly newsmagazine published by the American Chemical Society, the world's largest scientific society.

Preservatives can be grouped into three general types: antimicrobials that block growth of bacteria, molds or yeasts; antioxidants that slow oxidation of fats and lipids that leads to rancidity, and a third type that fights enzymes that promote the natural ripening that occurs after fruits or vegetables are picked.

Sulfur dioxide works in all three areas and is part of a larger group called sulfites, compounds found in numerous foods. A small percentage of people are allergic to sulfites, but the FDA says the preservative is safe for the majority. Some vinegars, fruit juices and dried fruits contain sulfites.

Sulfites block the growth of microbes by interrupting the normal functioning of their cells, according to Hassan Gourama, Ph.D., associate professor of food science at Pennsylvania State University.

Propionates are antimicrobials that help keep bakery products fresh. Propionic acid occurs naturally in apples, strawberries, grains and cheese. It works against bread molds and spores of a bacterium that leads to a condition called "rope" that makes bread inedible. Benzoates, another weak antimicrobial, fight fungi, working best in areas at a
'"/>

Contact: Michael Bernstein
m_bernstein@acs.org
202-872-6042
American Chemical Society
12-Nov-2002


Page: 1 2

Related biology news :

1. NASA Exhibit, Experts To Be In Baltimore Focusing On Space Research Improving Earth-Based Health Care
2. From science fiction to reality: Nanomedicine brings fresh hope to the medical world
3. Edible food wraps can keep kids sandwiches fresh and the environment cleaner
4. UNC researcher awarded top prize for oceanography, fresh water studies
5. MIT research in Hawaii could impact states management of fresh water
6. Report to aid nation in managing freshwaters
7. More people are getting sick from eating fresh fruits
8. Waddenzee fresher than ever
9. UC study links parasites in freshwater runoff to sea otter deaths
10. Endangered freshwater mussels saved
11. Meeting ecological and societal needs for freshwater

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:10/10/2019)... DIEGO (PRWEB) , ... October 09, 2019 , ... ... merger-acquisition of Nanosens Innovations, Inc., the creators of CRISPR-Chip™. Cardea first broke ... of their Early Access Program for the Genome Sensor™. Built with CRISPR-Chip technology, ...
(Date:10/8/2019)... ... October 08, 2019 , ... ... National Research Council of Canada (NRC) to create the Laboratory of Industrial ... and in manufacturing, LIFT will offer a competitive capacity to accelerate the ...
(Date:10/8/2019)... ... October 07, 2019 , ... The future of medicine in the ... resulting in people living longer, healthier lives. But it will be up to each ... E. Hood, MD, PhD, Chief Strategy Officer and Co-Founder of the Institute for Systems ...
Breaking Biology News(10 mins):
(Date:10/8/2019)... ... October 08, 2019 , ... ... Madhumita Suresh and Leslie Maurer presented company executives with a set of recommendations ... (MBS) graduates will offer insights from their TMP to a wider audience of ...
(Date:10/3/2019)... ... October 01, 2019 , ... Cheyenne is a beautiful ... Mimi, Cheyenne’s owner, owns and operates Rebel’s Run , which offers riding lessons ... amongst students and trail riding guests. Mimi describes her as her “go to ...
(Date:10/3/2019)... ... October 02, 2019 , ... ... is pleased to announce that it has moved into a new, 5000 sqft, ... instruments, the new facility demonstrates the company's continuous commitment to quality research and ...
(Date:9/24/2019)... HOM, Hong Kong (PRWEB) , ... September 24, 2019 , ... ... health in 2019 by the World Health Organization, with MRSA becoming one of the ... In 2018, there were 1,218 reported cases of community-associated MRSA (CA-MRSA), or a seven-fold ...
Breaking Biology Technology:
Cached News: