Featured Research

from universities, journals, and other organizations

Pathogen Studies Could Result In Safer Produce

Date:
December 26, 2005
Source:
USDA/Agricultural Research Service
Summary:
Because conventional washing methods to remove microbial contaminants from fresh fruit and vegetable produce surfaces have been found to be only marginally effective, Agricultural Research Service (ARS) scientists in Wyndmoor, Pa., want to give the produce packing and processing industries better techniques.

Surface pasteurization of cantaloupes using a commercial-scale dump tank (designed at ARS’s Eastern Regional Research Center) in ERRC’s biosafety level-2 pilot plant.
Credit: Photo by Paul Pierlott, USDA-ERRC/VGT

Because conventional washing methods to remove microbial contaminants from fresh fruit and vegetable produce surfaces have been found to be only marginally effective, Agricultural Research Service (ARS) scientists in Wyndmoor, Pa., want to give the produce packing and processing industries better techniques.

Bassam A. Annous, a microbiologist at the ARS Eastern Regional Research Center, Food Safety Intervention Technologies Research Unit, in Wyndmoor, and his colleagues are developing new technologies to remove or inactivate pathogens on both fresh and minimally processed produce.

Bacteria can quickly attach to the produce surfaces and form what are called biofilms that likely improve their ability to colonize and survive. A biofilm is a mass of microbes attached to a surface and to each other by bacterial polymers (complex sugars). This polymer coating may protect bacterial cells from exposure to antimicrobial compounds, such as chlorine, used to sanitize produce.

The human pathogen Salmonella is often responsible for produce-related outbreaks of foodborne illness. For example, Salmonella is difficult to remove from cantaloupe surfaces, because it attaches to inaccessible sites and forms biofilm on the cantaloupe rind surface. This allows the pathogen to avoid contact with the sanitizing solution. Surviving Salmonella cells can then be transferred from the surface of the melon into the internal tissues during cutting prior to consumption.

Annous and his colleagues recently gained new insight into biofilm formation by Salmonella on various surfaces. The ability of Salmonella cells to form biofilm on plastic or stainless steel surfaces was dependent on the production of fimbriae (hairlike structures) and cellulose that help the cells attach to and colonize surfaces.

Biofilm formation by Salmonella cells starts by attaching to the rind of cantaloupe following contamination. Once attached to the rind, Salmonella cells rapidly develop biofilm by growing and excreting polymers. This new knowledge helps explain how Salmonella survives harsh sanitizing environments.

ARS is the U.S. Department of Agriculture’s chief scientific research agency.


Story Source:

The above story is based on materials provided by USDA/Agricultural Research Service. Note: Materials may be edited for content and length.


Cite This Page:

USDA/Agricultural Research Service. "Pathogen Studies Could Result In Safer Produce." ScienceDaily. ScienceDaily, 26 December 2005. <www.sciencedaily.com/releases/2005/12/051216185102.htm>.
USDA/Agricultural Research Service. (2005, December 26). Pathogen Studies Could Result In Safer Produce. ScienceDaily. Retrieved April 18, 2014 from www.sciencedaily.com/releases/2005/12/051216185102.htm
USDA/Agricultural Research Service. "Pathogen Studies Could Result In Safer Produce." ScienceDaily. www.sciencedaily.com/releases/2005/12/051216185102.htm (accessed April 18, 2014).

Share This



More Plants & Animals News

Friday, April 18, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

The Great British Farmland Boom

The Great British Farmland Boom

Reuters - Business Video Online (Apr. 17, 2014) Britain's troubled Co-operative Group is preparing to cash in on nearly 18,000 acres of farmland in one of the biggest UK land sales in decades. As Ivor Bennett reports, the market timing couldn't be better, with farmland prices soaring over 270 percent in the last 10 years. Video provided by Reuters
Powered by NewsLook.com
Flamingo Frenzy Ahead of Zoo Construction

Flamingo Frenzy Ahead of Zoo Construction

AP (Apr. 17, 2014) With plenty of honking, flapping, and fluttering, more than three dozen Caribbean flamingos at Zoo Miami were rounded up today as the iconic exhibit was closed for renovations. (April 17) Video provided by AP
Powered by NewsLook.com
Change of Diet Helps Crocodile Business

Change of Diet Helps Crocodile Business

Reuters - Business Video Online (Apr. 16, 2014) Crocodile farming has been a challenge in Zimbabwe in recent years do the economic collapse and the financial crisis. But as Ciara Sutton reports one of Europe's biggest suppliers of skins to the luxury market has come up with an unusual survival strategy - vegetarian food. Video provided by Reuters
Powered by NewsLook.com
Could Even Casual Marijuana Use Alter Your Brain?

Could Even Casual Marijuana Use Alter Your Brain?

Newsy (Apr. 16, 2014) A new study conducted by researchers at Northwestern and Harvard suggests even casual marijuana use can alter your brain. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins