The microbes most commonly found on feet are:
The test procedure for Standard 42.10
The textile product undergoes four test phases as part of the "Microbiome-friendly" certification.
All textiles are washed in our laboratory according to a standardized procedure and then steam sterilized (autoclaved).
Hygienic products will be sterilized by means of UV light.
A co-culture is grown with the most common skin microbes S. epidermidis and the harmful bacteria S. aureus. The co-culture is then exposed to the product for a specified period of time and then compared to an untreated control group. The balance must not be tipped in favor of S. aureus under the influence of the product.
In this step, microbes typically found in the foot microbiome are cultured in our lab (S. hominis, S. warneri, S. epidermidis, M. luteus, M. globosa, C. Tuberculostearicum). A co-culture is exposed to the product to be tested and the change in diversity then compared to the untreated control group. The diversity of the foot microbiome must be preserved with regard to the most important key microbes.
A Microbiome-friendly foot product must both preserve diversity and, importantly, pose no detrimental effects to microbial growth. The test simulates skin contact by using a model. First, each key microbe is brought in direct contact with the foot textile product. Second, the microbe is covered with an agar layer and the product to be tested is applied to this layer. This simulates the potential penetration of the textile into the deeper layers of the skin. As always, the cell growth of the two batches is compared with the untreated control group; the growth must not be significantly influenced.
"Safeguarding and protecting the mechanisms of the microorganisms present on the skin is considered to be the best contribution textiles could offer the skin microbiome at this stage, considering the current state of research."
Sarah de Visser, Textile Specialist
All textile standards at a glance
A selection of our customers / awards
Numerous brands from the cosmetics industry with more than 350 tested products trust our seal: