Light-based method spots early collagen disorder in skin

A Hiroshima University-led research team has reported a method for detecting early changes in skin collagen before damage appears in standard images. The work could help researchers assess tissue deterioration sooner by measuring molecular organization, not just visible fiber condition, according to the International Institute for Sustainability with Knotted Chiral Meta Matter.

The findings were published July 16, 2026, in ACS Nano, according to the institute. The study found that dermal collagen can lose what the researchers call supramolecular chirality before its fibers become visibly thinner, fragmented or disconnected.

What the team measured

Collagen is described by the researchers as a layered structural material in skin, with molecules forming larger bundles and fibers that support tissue strength, flexibility and resistance to stress. Conventional imaging methods often focus on the shape and condition of those visible fiber networks, the institute said.

The team reported that this approach can miss earlier changes in the way collagen is arranged at smaller scales. In the study, samples retained much of their collagen content and surface coverage even as the coherence of collagen’s chiral organization fell, according to the researchers.

Chirality refers to structural handedness, a property in which two forms mirror each other but cannot be placed exactly on top of one another. The institute said collagen has organized handedness at molecular and larger structural scales, and that loss of this order may affect tissue function before large-scale damage can be seen.

Advanced light techniques

To track those changes, the researchers combined optical imaging with chiroptical spectroscopy, according to the study summary from SKCM2. The methods included synchrotron radiation vacuum-ultraviolet circular dichroism and multi-dimensional quantum cascade laser vibrational circular dichroism.

The institute said the combined approach allowed the researchers to compare collagen amount with structural coherence in the same tissue section. That comparison showed a gap between collagen quantity and collagen organization, with the protein still present while its internal arrangement had already weakened.

Ali Haider, first author of the study and a graduate research fellow at Hiroshima University’s WPI-SKCM2, said conventional imaging can show the visible components of collagen structure while missing subtler changes in how those components are arranged. Katsuya Inoue, a WPI-SKCM2 professor and corresponding author, said the results support viewing collagen as a hierarchical material whose function depends on organization across several length scales.

Possible uses

The researchers said the work may support future efforts to connect molecular chirality, supramolecular organization and the larger architecture of tissue. The institute said such a framework could help evaluate tissue integrity before major structural changes become irreversible.

The team also said the approach may inform research on wound healing, medical treatments and biomaterials designed to imitate or interact with living tissue. The reported findings do not describe a clinical test, but they point to a way of studying skin deterioration before collagen fibers show visible signs of breakdown.

The study was conducted by researchers affiliated with Hiroshima University, the Max Planck Institute for Intelligent Systems, Kyushu University, Kumamoto University, Ehime University, the Georgia Institute of Technology and the University of Glasgow, according to SKCM2. The institute said the collaboration included researchers from Japan, Germany, the United States and the United Kingdom, with support from WPI-SKCM2, Institut Henri Poincaré, LabEx CARMIN and the Alexander von Humboldt Foundation.

This story draws on original reporting from ScienceDaily.