| Popis: |
p ]Among the main polyphenols isolated from waste waters of olive (Olea europea) mill, catechol, 4-methylcatechol and hydroxytyrosol were toxic for Pseudomonas syringae subsp. savastanoi, the causai agent of olive knot disease. In particular the most toxic was 4-methylcatechol, Among some synthetic derivatives of catechol, as o-quinone, guaiachol, veratrole and diacetylcatechol, which were tested on P. savastanoi and on Corynebacterium michiganense (Gram+), o-quinone was strongly toxic for both bacteria, whereas veratroie and diacetylcatechol were toxic only for P. savastanoi. From fruits and leaves of olive was isolated oieuropein, a well known phenolic glucoside, from which was prepared its agtycone, by using a commercial β-giucosidase and hydroxytyrosol by chemical hydroiysis. The oieuropein was significantly toxic on P. savastanoi at a concentration of 10-3 and 10-4 M, while its aglycone was toxic in the range between 10-2 and 10-4 M and hydroxytyrosot at 10-2 and 10-3 M. |
