Polyester clothes stink after exercise; cotton, not so much

September 3, 2014

Polyester clothes smell worse than cotton, following intensive exercise by their wearers, because bacteria that cause odor grow better on polyester, according to research published ahead of print in the journal Applied and Environmental Microbiology.

In the study, the investigators collected t-shirts from 26 healthy individuals following an intensive, hour-long bicycle spinning session, and incubated the shirts for 28 hours before having them inspected by a trained odor panel. The researchers also investigated the taxonomy of the bacteria on the shirts, and in the axillaries.

Freshly secreted sweat has little odor, because the long-chain fatty acids the axillaries secrete are too big to be volatile, says first author, Chris Callewaert of Ghent University, Belgium. Bacteria break these, as well as hormones and sulfur compounds, down to waftable sized, odoriferous molecules.

On the clothes, the main culprit are micrococci, says Callewaert. "They are known for their enzymatic potential to transform long-chain fatty acids, hormones, and into smaller—volatile—compounds, which have a typical malodor."

Staphylococci, which inhabit both axillary skin and adjacent textiles (the latter with much less diversity), create a normal, non-malodorous body odor, he says.

"The micrococci are able to grow better on polyester," says Callewaert. He is currently investigating exactly why polyester encourages their growth, and suspects it has to do with the nature of its surfaces.

Corynebacteria are the main causes of bad odors in the armpits, but these anaerobes fail to grow on textiles, says Callewaert.

The impetus for this research is the suffering caused by unpleasant body odor (BO), says Callewaert, who has been consulted by more than 200 patients with this problem, and who runs the website, drarmpit.com.

"BO is taboo, and its prevalence is greatly underestimated," he says. "There is little these people can do to help themselves. Some of them are too psychologically distressed to talk to strangers, or even to leave the house, afraid of what people might think of their smell."

Wearing cotton clothes will reduce the problem somewhat, says Callewaert. But his ultimate objective is to solve the problem of , by transplanting microbes from non-malodorous relatives to those afflicted. (Early results are promising, he says.)

More generally, Callewaert advises people with smelly armpits to avoid overusing antiperspirants, which he says can encourage enrichment of the odor-causing corynebacteria in the axillae. "That is what I have heard from people with BO—the more they use it, the worse it eventually got," he says. But deodorants did not worsen the problem.

Explore further: Malaria mosquitoes guided by bacteria

More information: The manuscript can be found online at aem.asm.org/content/early/2014/08/12/AEM.01422-14.full.pdf+html . The final version of the article is scheduled for the November 2014 issue of Applied and Environmental Microbiology.

Related Stories

Malaria mosquitoes guided by bacteria

December 8, 2010

The composition of our skin bacteria determines whether we are attractive to malaria mosquito. This insight should make it possible to develop an effective odor trap for mosquitoes.

Odor code for food is based on a few volatile substances

June 25, 2014

(Phys.org) —The actual flavor of a food is experienced through our sense of smell rather than with our tongue. However, of the large number of volatile compounds in foods, only about 230 are involved in the scent, as reported ...

Recommended for you

Stressed out plants send animal-like signals

July 29, 2015

University of Adelaide research has shown for the first time that, despite not having a nervous system, plants use signals normally associated with animals when they encounter stress.

Sex among eukaryotes is far more common than once believed

July 28, 2015

(Phys.org)—For a long time, biologists have considered sex to be an inherent trait of multicellular life, while microbial eukaryotes were considered to be either optionally sexual or purely clonal. From this perspective, ...

1 comment

Adjust slider to filter visible comments by rank

Display comments: newest first

wellfeded
not rated yet Sep 03, 2014
I've been cursed with this like you know…FOREVER and they are finally figuring this out? Maybe there is hope for us stinkies after all.

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.