Antimicrobial salicylaldehyde Schiff bases: synthesis, characterization and evaluation

Area of Science:

• Medicinal Chemistry
• Organic Synthesis
• Microbiology

Background:

• Growing antibiotic resistance necessitates the continuous development of novel antimicrobial agents.
• Schiff bases are a class of organic compounds with diverse biological activities, including antimicrobial potential.

Purpose of the Study:

• To synthesize and characterize eight novel Schiff bases derived from salicylaldehyde and various amines.
• To evaluate the in vitro antimicrobial activity of the synthesized Schiff bases against a panel of bacterial strains.

Main Methods:

• Schiff bases were synthesized using the reflux method.
• Structural elucidation was performed using Fourier-transform infrared spectroscopy (FT-IR), proton nuclear magnetic resonance ((1)H-NMR), carbon-13 nuclear magnetic resonance ((13)C-NMR), and mass spectrometry.
• Antimicrobial activity was assessed by determining the zones of inhibition and minimum inhibitory concentrations (MICs).

Main Results:

• All eight synthesized Schiff bases exhibited moderate to good antimicrobial activity against the tested microorganisms.
• Specific compounds, including SB1, SB3, SB4, SB5, SB6, SB7, and SB8, demonstrated potent activity with MICs as low as 50 μg/mL against certain bacterial strains like Pseudomonas aeruginosa and Escherichia coli.
• The synthesized compounds were characterized, confirming their structures.

Conclusions:

• The synthesized Schiff bases possess significant antimicrobial potential.
• These compounds represent promising candidates for further investigation and development into novel antibiotic drugs.
• The study highlights the utility of Schiff bases in addressing the challenge of antimicrobial resistance.