Shining the light on asbestos

Asbestos is a naturally occurring silicate (silicon- and oxygen-containing) mineral that has a fibrous structure. These fibers are composed of microscopic fibers that can become airborne when the asbestos is disturbed, making asbestos easily inhaled. Formerly enjoying widespread use, especially in construction, for its insulation and fireproofing qualities, asbestos has since been banned in many countries. This is due to the discovery, in the 1970s, that asbestos fiber inhalation can cause lung cancer, asbestosis, and other lethal lung conditions.

Professor Akio Kuroda, from the Graduate School of Integrated Sciences for Life at Hiroshima University, is an expert in the field.

"While asbestos has been banned in most developed countries, large quantities of asbestos-containing materials remain in old buildings, and people are at risk of exposure to asbestos during demolition," he explains.

Kuroda confirms that it is not just building materials that pose a risk.

"In addition, natural minerals, such as talc, a raw material used in the manufacture of cosmetics, pharmaceuticals, and baby powder, may also contain asbestos. It has recently been highlighted that asbestos-contaminated talc may cause cancer," he says.

Kuroda is keen to focus on the importance of fast and accurate asbestos testing. In January 2022, the US Food and Drug Administration (FDA) released a report written by the Interagency Working Group on Asbestos in Consumer Products outlining an improved scientific assessment of asbestos in order to better protect the public.

A robust and portable fluorescence microscope has been developed for on-site asbestos detection. Magnification (approximately x300) can be digitally increased (until x1000). Credit: Akio Kuroda

Fine asbestos fibers (A, B, and C) are visible under fluorescent microscopy (FM) and scanning electron microscopy (SEM). Credit: Akio Kuroda

The fluorescently labeled asbestos-binding proteins visualize asbestos fibers. Credit: Akio Kuroda