Featured Research

from universities, journals, and other organizations

One third of milk and dairy products tested in Spanish restaurants exceed accepted microbe contamination limits

Date:
January 29, 2010
Source:
Plataforma SINC
Summary:
One-third of samples of milk and dairy products analysed in various restaurants exceed the microbe contamination limits set by the European Union, according to a new study.

Jug of milk.
Credit: SINC

One-third of samples of milk and dairy products analysed in various restaurants exceed the microbe contamination limits set by the European Union, according to a study carried out by researchers from the University of Valencia (UV). The experts advise against keeping milk in jugs and suggest that these foodstuffs need to be better handled.

Related Articles


"Out of all the dairy products we analysed, 35% of the samples exceeded the maximum contamination levels established by EU law for enterobacteriaceae, and 31% exceeded the limits set for mesophilic aerobic microorganisms (which grow at an optimum temperature of between 30 and 45ΊC)," Isabel Sospedra, a researcher at the Department of Preventive Medicine and Public Health of the UV and one of the authors of the study, said.

The scientists examined 265 batches of milk and ready-to-use milk derivatives in a range of bars and restaurants in Valencia, and checked whether their microbial quality fell into line with European Union regulations. The results, which have been published recently in the journal Foodborne Pathogens and Disease, show that one-third of the samples had some kind of microorganism contamination and were not fit for human consumption.

"Luckily none of the batches we analysed tested positive for Staphylococcus aureus, Listeria monocytogenes or Salmonella spp., which are pathogenic microorganisms that cause both food poisoning and toxoinfections," the study's authors says.

The researchers found differences according to the source of the sample (hot milk, products at room temperature or homemade dairy products). According to the study, 2% of the samples of hot milk (kept in jugs or stainless steel thermos flasks) tested positive for the bacteria Escherichia coli.

The team detected unsuitable practices, such as reheating milk over and over again, even in a microwave, and then pouring it back into the thermos, which increases the risk of microbial contamination. The study shows that there is a greater contamination risk from milk kept in jugs, meaning this type of container is not suitable for storing milk.

Focus more on cleaning utensils

The experts advise that, when using milk in any way, it is important to clean jugs, thermos flasks and the steamers of coffee machines thoroughly and frequently, using the right kind of hygienic sponges or cloths, which is not always the case. "Kitchen cloths are not suitable for disinfecting because of their microstructure, which means they transfer even greater levels of contamination," the scientists explain.

In terms of milk that is cold or at room temperature, this is usually kept in its original container in restaurants and bars -- a plastic bottle or tetrabrick. The study shows that containers with a lid are better, since tetrabricks opened with scissors are more exposed to microbial proliferation, and are especially vulnerable to enterobacteriaceae.

In terms of dairy products prepared in the restaurants themselves (custards, mousses, puddings and crθme caramels), custards (natillas) had the highest levels of contamination with microorganisms. This may be due to the fact this was the only foodstuff analysed that is further processed after being heated, say the scientists. Cross contamination could come from the hands of the person preparing the product, particularly when he or she places the biscuit on top of the dish.

In line with previous studies, the researchers also showed that adding cinnamon to dairy products led to reduced microorganism contamination, since this substance helps to eliminate microorganisms such as Escherichia coli, Listeria monocytogenes and bacteria from the Salmonella family.


Story Source:

The above story is based on materials provided by Plataforma SINC. Note: Materials may be edited for content and length.


Journal Reference:

  1. Sospedra et al. Microbial Contamination of Milk and Dairy Products from Restaurants in Spain. Foodborne Pathogens and Disease, 2009; 6 (10): 1269 DOI: 10.1089/fpd.2009.0337

Cite This Page:

Plataforma SINC. "One third of milk and dairy products tested in Spanish restaurants exceed accepted microbe contamination limits." ScienceDaily. ScienceDaily, 29 January 2010. <www.sciencedaily.com/releases/2010/01/100129092610.htm>.
Plataforma SINC. (2010, January 29). One third of milk and dairy products tested in Spanish restaurants exceed accepted microbe contamination limits. ScienceDaily. Retrieved January 26, 2015 from www.sciencedaily.com/releases/2010/01/100129092610.htm
Plataforma SINC. "One third of milk and dairy products tested in Spanish restaurants exceed accepted microbe contamination limits." ScienceDaily. www.sciencedaily.com/releases/2010/01/100129092610.htm (accessed January 26, 2015).

Share This


More From ScienceDaily



More Health & Medicine News

Monday, January 26, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Ebola Mistakes Should Serve a Lesson Says WHO

Ebola Mistakes Should Serve a Lesson Says WHO

AFP (Jan. 25, 2015) — The World Health Organization&apos;s chief on Sunday admitted the UN agency had been caught napping on Ebola, saying it should serve a lesson to avoid similar mistakes in future. Duration: 00:55 Video provided by AFP
Powered by NewsLook.com
Disneyland Measles Outbreak Spreads To 5 States

Disneyland Measles Outbreak Spreads To 5 States

Newsy (Jan. 24, 2015) — Much of the Disneyland measles outbreak is being blamed on the anti-vaccination movement. The CDC encourages just about everyone get immunized. Video provided by Newsy
Powered by NewsLook.com
Growing Measles Outbreak Worries Calif. Parents

Growing Measles Outbreak Worries Calif. Parents

AP (Jan. 23, 2015) — Public health officials are rushing to contain a measles outbreak that has sickened 70 people across 6 states and Mexico. The AP&apos;s Raquel Maria Dillon has more. (Jan. 23) Video provided by AP
Powered by NewsLook.com
Smart Wristband to Shock Away Bad Habits

Smart Wristband to Shock Away Bad Habits

Reuters - Innovations Video Online (Jan. 23, 2015) — A Boston start-up is developing a wristband they say will help users break bad habits by jolting them with an electric shock. Ben Gruber reports. Video provided by Reuters
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:

Strange & Offbeat Stories

 

Health & Medicine

Mind & Brain

Living & Well

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