Antimicrobial effectiveness of six paradols. 1: A structure-activity relationship study.

The pattern of antimicrobial effectiveness of (0)-, (2)-, (3)-, (4)-, (8)- and (9)-paradols was studied. (3)- Paradol was more active than the other homologues with a minimum inhibitory concentration (MIC) of 1 mg/ml when tested against Proteus vulgaris, Pseudomonas aeruginosa, Staphylococcus aureus and Botryodiplodia theobromae. At 0.2 mg/ml, (3)-paradol completely inhibited the spore germination of Trichophyton mentagrophytes and after 3 h of exposure at 0.5 mg/ml, it inhibited the growth of a heavy inoculum of Staphylococcus aureus (1 X 10(9) cells/ml).