Researchers from MIPT, Skoltech, the Joint Institute for High Temperatures of the Russian Academy of Sciences, and Lomonosov Moscow State University report a new approach to oil composition analysis. They used high temperature and pressure to dissolve oil in water and analyze its composition. The new method is compliant with green chemistry principles as it obviates the need for environmentally hazardous solvents. The paper was published in Analytical and Bioanalytical Chemistry.