Dehydration is supposed to be one of mechanisms of optical clearing, but current studies merely gave some qualitative
descriptions. Here an analysis method was established to evaluate the water content of skin with PLS method based on
the measurements of near-infrared reflectance spectroscopy and weight of porcine skin. Furthermore, a commercial
spectrometer with integrating sphere was used to measure the reflectance and transmittance after treatment with different
agents. Then the established method was used to evaluate the water content, while the Inverse Adding-Double algorithm
was used to calculate the reduced scattering coefficients. The results show that both the water contents and reduced
scattering coefficients decrease during the optical clearing process, and there is direct relationship between the optical
clearing efficacy and dehydration. With the treating time last, the relative change in reduced scattering coefficient is
larger than that in dehydration of skin, and the difference between the changes depends on the agents. Therefore, we
conclude that dehydration is the main mechanism of skin optical clearing during the 60 min treatment of the agents, but
for some OCAs, i.e., PEG400, glycerol, or D-sorbitol, there might be some other mechanisms contributing to the optical
clearing efficacy.
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