The chromatographic determination of the lipophilicity of newly synthesized aromatic-heterocyclic carbohydrazone derivatives with potential antibacterial and antituberculosis activities

Hydrazones are a large group of compounds with antibacterial, antituberculosis, antifungal, anticonvulsant, antiviral, antiprotozoal, anticancer and anti-inflammatory properties. Ten newly synthesized hydrazones were tested for their antimicrobial and antituberculosis activities. Screening tests were performed using the disk diffusion method. Then, the minimum inhibitory concentration (MIC) and minimum bactericidal concentration were determined for the most promising compounds. Synergy of the action of the tested substances with reference drugs was also tested. Drugs standardly used in the treatment of tuberculosis: rifampicin and isoniazid were used as reference substances. Based on the obtained results, fractional inhibitory concentration coefficients were calculated for individual combinations. The tested ones showed weak antimicrobial activity. They didn't show either synergism of action with rifampicin and isoniazid. Then, experimental and theoretical lipophilicity parameters were determined for the obtained derivatives. The research was carried out using reversed-phase high-performance liquid chromatography (RP-HPLC), in which the mobile phase is a mixture of methanol and water. To confirm the validity of the chromatographic technique used, both experimental and calculated lipophilicity parameters were correlated. The correlation matrix of these relationships was subjected to principal component analysis (PCA).