Definicja Triclosan

Co znaczy TRICLOSAN: triklosan C12H7C13O2
Działanie
Właściwości
przeciwzapalne,
hamuje niszczenie kolagenu i kości,
spowalnia tworzenie się płytki i kamienia,
minimalizuje halitosis,
działa na bakterie G+ i G-,tlenowe,beztlenowe,grzyby i wirusy,przez destabilizacją błony komórkowej utrudniając napływ kwasów aminowych i powodując utratę jonów potasu,nukleotydów i kwasów aminowych,hamuje również syntezę kwasów tłuszczowych,
by wydłużyć jego działanie dodaje się do niego fluorek sodu NaF albo kopolimer /methyl vinyl ether-malein anhydride copolimer PVM-MA/ powiększa skuteczność, stabilność w paście,retencję w tkankach /błona śluzowa,szkliwo,ślina,płytka bakteryjna/ skąd triklosan może być poprzez długi czas uwalniany,
stanowi składnik past Blend-a-med Complete 7,Colgate Total 12,
sam triklosan utrzymuje się do 4godz.,kopolimer powiększa retencję triklosanu do szkliwa,tkanek miękkich i płytki nazębnej do 124godz..
szerokie spektrum antybakteryjne
w celu stabilizacji triklosanu w strukturze pasty,dodaje się do składu kopolimer na przykładPVM/MA /eter poliwinylometylowy i kwas maleinowy/,
działa na bakterie G+ i G-,beztlenowce,Candida albicans,Toxoplasma gondii,Plasmodium falciparum,wirusy,
hamuje produkcję cytokin IL-1b w komórkach stymulowanych poprzez TNF-alfa poprzez obniżenie produkcji mRNA,
hamuje uwalnianie prostaglandyn PGE2,
ogranicza aktywność COX2,
hamuje produkcję i uwalnianie metaloproteinaz MMP rozkładających kolagen,
General
Synonyms: 2,4,4'-trichloro-2'-hydroksydwufenyloeter, CH-3565, Lexol 300, Irgasan DP 200
Use: antimicrobial in soaps, shampoos and other products
Molecular formula: C12H7Cl3O2
CAS No: 3380-34-5
EINECS No: Physical data
Appearance: white crystalline powder
Melting point: 56 - 58 C
Boiling point:
Vapour density:
Vapour pressure:
Density (g cm-3):
Flash point:
Explosion limits:
Autoignition temperature:
Water solubility:
Stability
Stable. Incompatible with strong oxidizing agents.
Toxicology
Skin, eye and respiratory irritant.
Triclosan, a chemical used for its antibacterial properties, is an ingredient in many detergents, dish-washing liquids, soaps, deodorants, cosmetics, lotions, anti-microbial creams, various toothpastes, and an additive in various plastics and textiles. However, the safety of triclosan has been questioned in regard to environmental and human health. While the companies that manufacture products containing this chemical claim that it is safe, the United States Environmental Protection Agency (EPA) has registered it as a pesticide. The chemical formulation and molecular structure of this compound are similar to some of the most toxic chemicals on earth, relating it to dioxins and PCBs. The EPA gives triclosan high scores both as a human health risk and as an environmental risk.
Triclosan is a chlorophenol, a class of chemicals which is suspected of causing cancer in humans. Externally, phenol can cause a variety of skin irritations, but since it can temporarily deactivate sensory nerve endings, contact with it may cause little or no pain. Taken internally, even in small amounts, phenol can lead to cold sweats, circulatory collapse, convulsions, coma and death. Additionally, chlorinated hydrocarbon pesticides can be stored in body fat, sometimes accumulating to toxic levels. Long term exposure to repeated use of many pesticide products can damage the liver, kidneys, heart and lungs, suppress the immune mechanizm, and cause hormonal disruption, paralysis, sterility and brain haemorrhages.
Dioxins, PCBs, chlorophenols and many pesticides are categorized as persistent organic pollutants. In other words, they persist in the environment and accumulate to higher and higher concentrations with each step up the food chain. Virtually, every creature on earth has a measured amount of these pollutants in its body fat. Once absorbed into the fat cells, it is nearly impossible to eliminate these compounds. Triclosan is among this class of chemicals, and humans are among the animals at the top of the food chain. The health risks are considerable.
Employing a strong antibiotic agent such as triclosan for everyday use is of questionable value. Many antimicrobial treatments are toxic and take a shotgun approach to killing all microscopic organisms to which they are applied. However, this approach includes the risk of toxicity to host organisms, that is, the plants or animals (including humans) exposed to treatment for microbial infections. Toxic exposure to living creatures can also occur when food items and objects such as utensils or hard surfaces are treated with disinfectants for microbial contamination. Additionally, the shotgun approach destroys the beneficial bacteria which occur naturally in the environment and in our bodies. These so-called friendly bacteria cause no harm and often produce beneficial effects such as aiding metabolism and inhibiting the invasion of harmful pathogens. Anti-microbial formulas and disinfectants can also cause genetic mutations resulting in drug-resistant bacterial and mutant viruses, producing new strains of harmful microbes for which the human immune mechanizm has no defence.
Triclosan has not been completely tested and analyzed for all health and environmental risks, but since it occurs in the category of the chemicals which are known to have the detrimental effects described here, do you want it added to products you use every day?
Triclosan (chemically 5-chloro-2-(2,4-dichlorophenoxy)phenol) is a potent wide spectrum antibacterial and antifungal agent.
Contents
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* 1 Chemistry
* 2 Uses
* 3 Mechanism of action
* 4 Resistance concerns
* 5 Health concerns
* 6 See also
* 7 External links
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Chemistry
This organic compound is a white powdered solid with a slight aromatic/phenolic odor. It is a chlorinated aromatic compound which has functional groups representative of both ethers and phenols. Phenols often show anti-bacterial properties. Triclosan is slightly soluble in water, but soluble in ethanol, diethyl ether, and stronger basic solutions such as 1 M sodium hydroxide, like many other phenols.
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Uses
It is found in soaps, deodorants, toothpastes and is infused in an increasing number of consumer products, such as kitchen utensils, toys, bedding, socks, and trash bags. It has been shown to be effective in reducing and controlling bacterial contamination on the hands and on treated products.
Triclosan is regulated aby both the U.S. Food and Drug Administration and aby the European Union. In the environment, triclosan is removed during normal waste treatment processes as shown aby extensive environmental studies, and any of it that remains after waste treatment quickly breaks down into other compounds in the environment. However, one study showed that triclosan was broken down into dioxins in river water, because of the presence of sunlight (PMID 15779749).
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Mechanism of action
Triclosan appears to kill bacteria mainly aby inhibiting fatty acid synthesis. Triclosan binds to bacterial enoyl-acyl carrier protein reductase enzyme (ENR), which is encoded aby FabI. This binding increases the enzyme's affinity for nicotinamide adenine dinucleotide (NAD+). This results in the formation of a stable ternary complex of FabI-NAD+-triclosan, which is unable to participate in fatty acid synthesis. Fatty acid is necessary for reproducing and building cell membranes. Humans do not have an ENR enzyme, and thus are not affected. Some bacterial strains are resistant to triclosan due to FabI mutations which decrease triclosan's effect on FabI-NAD+ binding. (PMID 10196195) Another way for bacteria to gain resistance to triclosan is to overexpress FabI (PMID 11418506).
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Resistance concerns
An article coauthored aby Dr. Stuart Levy in the August 6, 1998 issue of Nature (PMID 9707111) warned that its overuse could cause resistant strains of bacteria to develop, in much the same way that antibiotic-resistant bacterial strains are emerging, based on speculation that triclosan behaved like an antibiotic. Based on this speculation, in 2003, the Sunday Herald newspaper reported that some UK supermarkets and other retailers were considering phasing out products containing triclosan.
It has since been shown that the laboratory method used aby Dr. Levy was not effective in predicting bacterial resistance for biocides like triclosan, based on work aby Dr. Peter Gilbert in the UK [1] (PMID 12957932). At least seven peer-reviewed and published studies have been conducted demonstrating that triclosan is not significantly associated with bacterial resistance, including one study coauthored aby Dr. Levy, published in August of 2004 in Antimicrobial Agents and Chemotherapy (PMID 15273108). In addition, there is 30 years of experience with triclosan without any incidences of acquired bacterial resistance reported, and there are no studies showing acquired resistance after long-term use.
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Health concerns
Reports have suggested that triclosan can combine with chlorine in tap water to form chloroform gas (PMID 15926568), which the U.S. EPA classifies as a probable human carcinogen. As a result, triclosan was the target of a UK cancer alert, even though the study showed that the amount of chloroform generated was less than amounts often present in chlorinated drinking waters.
Triclosan reacts with the free chlorine in tap water to also produce lesser amounts of other compounds, like 2,4-dichlorophenol (PMID 15926568). Most of these intermediates convert into dioxins upon exposure to UV radiation (from the sun or other sources). Although small amounts of dioxins are produced, there is a great deal of concern over this effect because dioxins are extremely toxic and are very potent endocrine disruptors. They are also chemically very stable, so that they are eliminated from the body very slowly (they can bioaccumulate to dangerous levels), and they persist in the environment for a very long time.
Triclosan is chemically somewhat similar to the dioxin class of compounds. Its production leads to small amounts of residual polychlorinated dioxins, and polychlorinated furans which are contained in small amounts, in the products that are using it.
Triclosan is used in many common household products including Clearasil® Daily Face Wash, Dentyl® mouthwash, Colgate Total Fresh Stripe®, Colgate Total®, Dial®, Sensodyne Total Care®, and Mentadent®.
At this time, in the United States, manufacturers of products containing triclosan must say so somewhere on the label. So if triclosan is of concern to the reader, look for claims of a product being 'anti-bacterial', and then check the label for triclosan.
The latest rage in the arsenal of antibacterial chemicals, triclosan is included in detergents, dish soaps, laundry soaps, deodorants, cosmetics, lotions, creams, and toothpastes and mouthwashes. In 1998, Americans snatched up $540 million of these products, without proof that they even do what they claim.
But, is triclosan safe? The EPA registers it as a pesticide, giving it high scores as a risk to both human health and the environment. The USP recently proposed a new monograph for the specific testing of triclosan. It is a chlorinated aromatic, similar in molecular structure and chemical formula to some of the most toxic chemicals on earth: dioxins, PCB’s, and Agent Orange. Its manufacturing process may produce dioxin, a powerful hormone-disrupting chemical with toxic effects in the parts per trillion (one drop in 300 Olympic-sized swimming pools!). Hormone disruptors pose enormous long-term chronic health risks, because they interfere with the way hormones perform (such as changing genetic material, or fostering birth defects).
Triclosan is a chlorophenol, a class of chemicals suspected of causing cancer in humans. Externally, it can cause skin irritations, but since "….phenols can temporarily deactivate the sensory nerve endings….contact with [triclosan] often causes little or no pain". "Internally, it can lead to cold sweats, circulatory collapse, convulsions, coma, and even death". Stored in body fat, it can accumulate to toxic levels, damaging the liver, kidneys, and lungs, and can cause paralysis, sterility, suppression of immune function, brain hemorrhage, decreased fertility and sexual function, heart problems, and coma."
Employing a strong antibiotic agent such as triclosan for everyday use is of questionable value, as it takes a shotgun approach to killing all microscopic organisms while also destroying the beneficial bacteria in the environment and in our bodies. These friendly bacteria cause no harm, and often produce beneficial effects, such as aiding metabolism and inhibiting the invasion of the harmful pathogens.
Boston-based microbiologist Laura McMurray and colleagues at the Tufts University School of Medicine, say that "triclosan is capable of forcing the emergency of ‘superbugs’ that it cannot kill. Experiments have shown that it may not be the all-out germ killer that scientists once thought it was….using triclosan daily in the home, in products ranging from children’s soaps to toothpaste to ‘germ-free’ cutting boards, may be unwise. In "New Products Feared Breeding Tougher Germs", J.B. Verrengia says "Public health officials have blamed the indiscriminate prescription of antibiotics for the spread of drug-resistant bacteria. The Tufts study suggests the recent widespread use of antibacterial agents in everyday products might have similar results". Doctors say that washing your hands with soap and water is the best preventative, and some doctors admit that including triclosan in the soap is an additional, unjustified expense; plain soap does just as well.