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Water and ion distribution profiles in human skin
T von Zglinicki1, M Lindberg, G M Roomans
1Institute of Pathology, Charité, Berlin, Germany.
Acta Dermato-Venereologica
|October 1, 1993
Summary
X-ray microanalysis reveals distinct water gradients in human skin's outer layers. This study quantifies water and ion distribution, suggesting ions like sodium and potassium may be in equilibrium between the stratum corneum and dermis.
Area of Science:
- Dermatology
- Biophysics
- Analytical Chemistry
Background:
- Understanding skin hydration and ion distribution is crucial for dermatology.
- Previous studies demonstrated ion distributions but lacked precise water content data.
Purpose of the Study:
- To quantitatively determine local water content and ion profiles across human epidermal strata.
- To investigate the relationship between water and ion distributions in skin.
Main Methods:
- Bulk sample X-ray microanalysis (XRMA) of human gluteal skin.
- Analysis of samples in both frozen hydrated and frozen dried states.
- Quantitative determination of water and elemental composition (Na, K, Cl, P, S).
Main Results:
- A steep water gradient was observed in the stratum corneum towards the stratum granulosum.
- Water content remained constant in deeper skin layers, including the papillary dermis.
- Confirmed previously shown distributions of Na, K, Cl, P, and S.
Conclusions:
- Data suggest major monovalent ions (Na, K, Cl) are in equilibrium between the stratum corneum and dermis.
- This equilibrium is based on the assumption of ions in solution and water as solvent.
- The findings place significant bounds on potential ion transport gradients within the epidermis.