HOME >> BIOLOGY >> NEWS
Vinegar increases killing power of bleach

Adding white vinegar to diluted household bleach greatly increases the disinfecting power of the solution, making it strong enough to kill even bacterial spores. Researchers from MicroChem Lab, Inc. in Euless, Texas, report their findings today at the 2006 ASM Biodefense Research Meeting.

Sodium hypochlorite (NaOCl) in the form of laundry bleach is available in most households. The concentrate is about 5.25 to 6 percent NaOCl, and the pH value is about 12. Sodium hypochlorite is stable for many months at this high alkaline pH value.

"Laundry bleach is commonly diluted about 10 to 25-fold with tap water to about 2000 to 5000 parts per million of free available chlorine for use as an environmental surface disinfectant, without regard to the pH value of the diluted bleach. However, the pH value is very important for the antimicrobial effectiveness of bleach," says Norman Miner, a researcher on the study.

At alkaline pH values of about 8.5 or higher, more than 90 percent of the bleach is in the form of the chlorite ion (OCl-), which is relatively ineffective antimicrobially. At acidic pH values of about 6.8 or lower, more than 80 percent of the bleach is in the form of hypochlorite (HOCl). HOCl is about 80 to 200 times more antimicrobial than OCl-.

"Bleach is a much more effective antimicrobial chemical at an acidic pH value than at the alkaline Ph value at which bleach is manufactured and stored. A small amount of household vinegar is sufficient to lower the pH of bleach to an acidic range," says Miner.

Miner and his colleagues compared the ability of alkaline (pH 11) and acidified (pH 6) bleach dilutions to disinfect surfaces contaminated with dried bacterial spores, considered the most resistant to disinfectants of all microbes. The alkaline dilution was practically ineffective, killing all of the spores on only 2.5 percent of the surfaces after 20 minutes. During the same time period the acidified solution kill
'"/>

Contact: Jim Sliwa
jsliwa@asmusa.org
202-942-9297
American Society for Microbiology
17-Feb-2006


Page: 1 2

Related biology news :

1. Chickadee, nutchatch presence in conifers increases tree growth, says CU-Boulder study
2. Gene variant increases risk of blindness
3. Study finds Western-style meat-sweet diet increases risk of breast cancer in postmenopausal women
4. Endometriosis increases the risk of certain cancers
5. Gene variant increases risk for alcoholism following childhood abuse
6. New treatment increases life time expectancy of patients suffering from advanced liver cancer
7. Salt increases ulcer-bug virulence
8. Sleep apnea increases risk of diabetes and hypertension in pregnant women
9. Fat tissue-derived hormone leptin increases e-cadherin expression, obesity-breast cancer link noted
10. Cetuximab and irinotecan combination increases survival in metastatic colorectal cancer
11. Cetuximab increases survival in advanced colorectal cancer patients, study shows

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


(Date:8/26/2020)... ... August 25, 2020 , ... Modality Solutions, a ... 2020 annual Inc. 5000 list. The list is the most prestigious ranking of the ... well, and for this year’s list, reported three-year revenue growth of 71 percent. ...
(Date:8/21/2020)... ... August 19, 2020 , ... The ... uniting life science, data science, informatics and IT leaders goes VIRTUAL and announces ... of uncertainty and change, Bio-IT takes the leadership role of keeping our life ...
(Date:8/7/2020)... , ... August 06, 2020 , ... ... industry, is pleased to announce that Eric Chen and Jessica Wong have joined ... Product Management & Strategy, respectively. , Eric Chen heads development efforts for Alucio’s ...
Breaking Biology News(10 mins):
(Date:7/18/2020)... ... July 17, 2020 , ... dicentra , a leading ... food industries, is pleased to announce that Charles Galea has joined its clinical ... Charles is an accomplished and results-driven sales executive with over 10 years of ...
(Date:7/10/2020)... ... July 09, 2020 , ... In most research using ... suppress pigment formation in zebrafish embryos, maintaining optical transparency to facilitate microscopic imaging. ... has been using the zebrafish model to investigate the causes of leukaemia and ...
(Date:7/7/2020)... ... July 06, 2020 , ... Bio-IT World has announced the ... Squibb, the University of Chicago, Massachusetts General Hospital, Mission: Cure, and the Pistoia ... program, highlighting outstanding examples of how technology innovations and strategic initiatives can be ...
(Date:7/1/2020)... WESTMINSTER, Colo. (PRWEB) , ... ... ... providers of expert tissue data insights, today announced that the launch of ... PD-L1 results along with data about the tumor microenvironment (TME). , “Flagship’s ...
Breaking Biology Technology:
Cached News: