viernes, 1 de agosto de 2014

SALMONELLA and DISINFECTANTS

Study: Salmonella Biofilms Resistant To Powerful Disinfectants


A National University of Ireland - Galway researcher has discovered the difficulties of removing salmonella after it was adhered to a surface for about a week, the university reports. The study was published in the Journal of Applied and Environmental Microbiology.
Microbiologist, Mary Corcoran, attempted to kill salmonella biofilms on various hard surfaces with three different types of disinfectants — even soaking the bacteria in disinfectant for 1.5 hours — but found the germs' viability unaffected by the chemical. Corocoran looked at the habits of salmonella biofilm on glass, stainless steel, glazed tile, concrete and plastic. It showed the biofilm of salmonella grows over time, and more firmly attaches to surfaces.
The study is considered a warning to food processing plants and other food services, who can not detect the bacteria before it has an opportunity to form biofilm on a surface.
"Food processing facilities must take strict care to keep salmonella out fo the clean areas where cooked foods get further processing and packaged, and ask whether disinfectants that are promoted as killing various types of bacteria are really as effective as claimed," Corcoran said. She added that good cleaning and appropriate food handling practices (such as regular hand washing) remained the best preventative measure to salmonella-induced illnesses. 

The three disinfectants used against salmonella included sodium hypochorite (household bleach), sodium hydroxide, and benzalkonium chloride.
- See more at: http://www.cleanlink.com/news/article.asp?id=16742&email=emalaguti@chemtron.com#sthash.6sJl2wJR.dpuf

Publicado por EMILIO MALAGUTI en 6:38

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GREEN CHEMICALS

The Green Seal certification is granted by the organization with that name and has a great number of members contributing with the requirements to pass a raw material or a chemical product as "green". Generally for a material to be green, has to comply with a series of characteristics like: near neutral pH, low volatility, non combustible, non toxic to aquatic life, be biodegradable as measured by oxygen demand in accordance with the OECD definition.
Also the materials have to meet with toxicity and health requirements regarding inhalation, dermal and eye contact. There is also a specific list of materials that are prohibited or restricted from formulations, like ozone-depleting compounds and alkylphenol ethoxylates amongst others. Please go to http://www.greenseal.com/ for complete information on their requirements.
For information on current issues regarding green chemicals, see the blog from the Journalist Doris De Guzman, in the ICIS at: http://www.icis.com/blogs/green-chemicals/.
Certification is an important — and confusing — aspect of green cleaning. Third-party certification is available for products that meet standards set by Green Seal, EcoLogo, Energy Star, the Carpet & Rug Institute and others.
Manufacturers can also hire independent labs to determine whether a product is environmentally preferable and then place the manufacturer’s own eco-logo on the product; this is called self-certification. Finally, some manufacturers label a product with words like “sustainable,” “green,” or “earth friendly” without any third-party verification.
“The fact that there is not a single authoritative standard to go by adds to the confusion,” says Steven L. Mack M.Ed., director of buildings and grounds service for Ohio University, Athens, Ohio.
In www.happi.com of June 2008 edition, there is a report of Natural formulating markets that also emphasises the fact that registration of "green formulas" is very confused at present, due to lack of direction and unification of criteria and that some governmental instittion (in my opinion the EPA) should take part in this very important issue.