Grazing incidence diffraction studies of the interactions between ursane-type antimicrobial triterpenes and bacterial anionic phospholipids

- α-Amyrin and ursolic acid form hexagonal phases in Langmuir monolayers.
- α-Amyrin and ursolic acid form miscible films with Escherichia coli anionic phospholipids.
- The binary monolayers in systems with ursolic acid are 2D-crystalline.
- H-bonds between carboxylic groups stabilize the films in systems with ursolic acid.