Three-Dimensional Analysis of Water Dynamics in Human Skin by Stimulated Raman Scattering

Area of Science:

• Biophysics
• Dermatology
• Optical Imaging

Background:

• The stratum corneum (SC) is the skin's outermost layer, crucial for barrier function against dehydration.
• Evaluating the SC's water absorption and retention capacity is key to assessing skin condition and barrier integrity.

Purpose of the Study:

• To investigate the three-dimensional structure and water distribution within the SC during water absorption.
• To evaluate the potential of stimulated Raman scattering (SRS) imaging for assessing SC hydration dynamics.

Main Methods:

• Utilized stimulated Raman scattering (SRS) imaging to visualize the SC structure.
• Analyzed water absorption and distribution in dried SC sheets, including the effects of acetone treatment.

Main Results:

• Observed that water absorption and retention in the SC are sample-dependent and can be spatially heterogeneous.
• Demonstrated that acetone treatment results in spatially homogeneous water retention within the SC.
• Highlighted the capability of SRS imaging to capture these hydration dynamics.

Conclusions:

• SRS imaging is a powerful tool for visualizing SC structure and water distribution.
• The findings suggest SRS imaging has significant potential for diagnosing skin conditions related to barrier function and hydration.