Non‐invasive monitoring of oxidative skin stress by ultraweak photon emission (UPE)‐measurement. I: mechanisms of UPE of biological materials

Abstract

Measurement of UPE could be proven to be a highly sensitive method to assess oxidative processes in biological molecules. The reported data indicate that UPE generated by oxidation stressed skin is mainly due to non-fluorescent photon emission via Trp, whereby Trp acts as an energy receptor from other excited species of oxidation-modified amino acids.