Molecular environment and reactivity in gels and colloidal solutions under identical conditions

Abstract

PEG–Tyr block copolymers form gels and micelles that can co-exist under identical conditions. We compare molecular mobility and chemical reactivity in these two systems.

The key phytochemistry of rosemary (Salvia rosmarinus) contributing to hair protection against UV

“…The amino acids are photoionized and produce aromatic free radicals. The subsequent chemistry is complex but oxidation of the tyrosine [5] and tryptophan residues [6] has been measured with tryptophan producing the well-studied, yellow-coloured kynurenines. Singlet oxygen and superoxide radical anion are formed by photosensitization of both aromatic amino acid residues and melanin pigments [7] and these reactive oxygen species (ROS) can propagate further reactivity in the proteins and lipid structures [8].…”