Woody Biomass (IMAGE) University of Tokyo Caption The source of phenols in these experiments was lignin, which is involved in the tough structural components of rigid plant bodies such as trees. So woody biomass like this is the ideal raw material as it can be more sustainably sourced than petroleum. Credit CC0 - Pixabay/ybernardi Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.