Bescós-Ramo, Sara Gámez, Enrique Encabo-Berzosa, María del Mar Piñol, Milagros Oriol, Luis Arruebo, Manuel Catechol-substituted siderophore colistin exhibits superior antimicrobial activity than its unmodified polypeptide counterpart 10.1186/s13065-025-01538-7 2025 2025