Thursday, August 8, 2013

Is My Facewash Killing Fishes? Triclosan and the Environment

Anna asks, “Robyn, do you have an opinion on triclosan? I <3 fluoride but I avoid triclosan on environmental grounds, but you might be more informed.”

So, first of all, what exactly is triclosan? Triclosan is an antibacterial and antifungal agent that inhibits fatty acid synthesis in many bacterial species. When triclosan hits a bacteria, it will bind to an enzyme called enoyl-acyl carrier protein reductase, or ENR. When ENR is bound to triclosan, its affinity for another coenyzme, nicotinamide adenine dinucleotide (NAD+), is greatly increased. This means that they become best buds and bind a bunch (yay alliteration!). As a result, instead of helping to make lovely fatty acids for the bacteria in question, everything comes to a grinding halt in a big ENR-NAD+-triclosan complex that just hangs out instead of doing useful shit. Since the bacteria can't synthesize fatty acids, it can't built its cell membranes, so it dies. Because humans don't use ENR to make fatty acids, it is safe for us to use.


Triclosan
Source: http://en.wikipedia.org/wiki/File:Triclosan.svg
Triclosan is used in a LOT OF SHIT. You can find it in everything from acne face washes to deodorant to toothpaste. However, consumer products are far from the only source of triclosan. The EPA notes, "In commercial, institutional, and industrial equipment uses, triclosan is incorporated in conveyor belts, fire hoses, dye bath vats, or ice-making equipment as an antimicrobial pesticide."

Environmental activists have raised concerns about triclosan's potential polluting effects. These concerns mostly center around aquatic life. For example, triclosan seriously fucks up algal communities. There is also evidence that triclosan bioaccumulates in fish, meaning it is absorbed at a faster rate than it is excreted. The Environmental Protection Agency (EPA) has also found waterways where triclosan levels reached concerning amounts for aquatic plants (although not for animals). In sufficient quantities, triclosan can be toxic to aquatic life.

Source: http://mercurypolicy.scripts.mit.edu/blog/wp-content/uploads/2013/01/bioaccumulation_graphic.jpg
In addition to the more serious concerns about triclosan, there have been some false alarms. For example, triclosan degrades into a form of dioxin. Dioxins are commonly cited as high-concern environmental pollutants due to their extreme toxicity. Nevertheless, the type of dioxin that triclosan forms is safe for animals and thus not a huge concern. Predictably, though, many people have unnecessarily freaked out about this.

No large scale ecological studies have sufficiently investigated the potential harmful environmental effects of triclosan, but there is definitely evidence suggesting that it may be a concern. The EPA suggests that industrial use of triclosan, as opposed to commercial use, is the biggest concern ecologically, and they center their suggestions for future research and their recommendations based on that assumption. In comparison to triclosan pollution of that magnitude, your face wash doesn't seem particularly sinister.

However, as they say, no single drop of water thinks that it is responsible for the flood. You probably don't need triclosan in your life, so it may be worth it to reduce or eliminate that particular ingredient from your routine. Still, if you are concerned about environmental impacts of triclosan (or anything else!) you'll likely have a greater impact by contacting your congresspeople (The Directory of Representatives can be found here) and letting them know about your passion for limiting industrial pollution and by voting for environmentally friendly measures when they make their way onto your ballot.

4 comments:

  1. wow, thanks! Fair and balanced FO REALZ as in not in the Fox style. ;) I had no idea that triclosan was such a big thing outside of personal hygiene products. Once again, your blog is fucking awesome.

    ReplyDelete
  2. In the same vein of this topic- perhaps you could do a post on "microbeads"- recently attributed to causing a huge water sanitation issue due to the fact that the pestery little plastic bubbles don't biodegrade

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  3. Hi,Triclosan,a germ-slaughtering substance usually utilized within antibacterial items like soap,winds up in our streams after it washes down the drain.Triclosan is poisonous to oceanic life and can result in antibiotic-resistant superbacteria.We can all lessen the measure of triclosan in our waterways by perusing marks when we shop and maintaining a strategic distance from items that utilization it.Have a nice day.
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