In studying polar bear fur, possible solution to ‘forever chemicals’ in environment

Upon testing the unwashed samples against ice, they were found to contain sebum comparable to fluorinated ski skins. These materials are used in skis to grip them on ice and help them glide. However, fluorinated skins contain PFAs. Though extensively used in making nonstick cookware, water-repellent clothing and grease-resistant products, these chemicals do not break down and can remain in the environment for prolonged periods. PFA exposure has also been linked to decreased fertility and developmental effects in children.

Analysing the properties of fur sebum revealed that it lacks squalene, a substance that is predominant in human sebum. The fur sebum also contains cholesterol and other fatty acids. “These could be unique to polar bears, but we can’t be sure of that, as so few studies have looked at the composition of animal sebum,” Bodil Holst, a physicist at the University of Bergen in Norway and co-author of the study told the New Scientist magazine.

The findings could help design naturally-sourced coatings that could reduce current dependence on PFAs. “If we do it in the right way, we have a chance of making them environmentally friendly,” Holst told The Washington Post.