Abstract:

The antibacterial activities of sugar-based cationic gemini surfactants （SGCS） and sugar-based cationic surfactants （SCS） against Escherichia coli （E.coli） and Staphylococcus aureus were determined by the inhibition zone method. The antibacterial activity of SGCS is better than that of SCS. The inhibition zone of SGCS is increased and then decreased with the increasing carbon chain length of SGCS, and C₁₂-SGCS has the optimum antibacterial activity. The bactericidal activities of C₁₂-SGCG and C₁₂-SCS against sulfate reducing bacteria （SRB） , Ferribacteriales （FEB） , Saprophytic bacteria group （TGB）, E.coli and Fusarium graminearum were evaluated. The bactericidal activity of C₁₂-SGCS is better than that of C₁₂-SCS. The bactericidal rates of C₁₂-SGCS at 15 mg/L against SRB, FEB and TGB are all above 99%. SGCS has a good application prospect because of its broad spectrum and high efficiency in bactericidal and antibacterial actions.

Key words: sugar-based surfactant, gemini surfactant, cation, bactericidal, antibacterial