A thesis offer is available within CNRS, LCC-UPR 8241 / IUT - Université de Toulouse in Castres in collaboration with the LBAE of Auch. Co-direction between Dominique Agustin and Tassadit Ouidir-Nait Chabane. Theme: CATonPGA - Catalysts supported on natural substrates of type γ-PGA: application to the transformation of natural products under green chemistry conditions.