[Antimicrobial activity exerted by sodium dichloroisocyanurate]

Area of Science:

• Microbiology
• Antimicrobial Agents
• Public Health

Background:

• Sodium dichloroisocyanurate (NaDCC) is a widely used chlorinated cleaner for sanitation.
• It has replaced hypochlorite in some applications, such as sterilizing infant feeding bottles.
• NaDCC hydrolyzes in water to release hypochlorous acid, the active microbicidal agent.

Purpose of the Study:

• To evaluate the antimicrobial activity of sodium dichloroisocyanurate against a wide range of microorganisms.
• To assess the influence of environmental factors and organic matter on NaDCC's efficacy.
• To determine the safety profile of NaDCC in toxicological studies.

Main Methods:

• Tested NaDCC against 66 fungal strains, 28 Gram-positive bacteria, 29 Gram-negative bacteria, and Trichomonas vaginalis.
• Evaluated antimicrobial activity in both cultural and non-cultural conditions.
• Assessed the impact of pH, temperature, and 1% organic matter (serum) on NaDCC's activity.

Main Results:

• NaDCC demonstrated rapid antimicrobial activity against Gram-negative bacteria (e.g., E. coli, Salmonella typhimurium, Pseudomonas aeruginosa), fungi (e.g., Candida, Penicillium, Aspergillus), and Trichomonas vaginalis.
• Activity was observed in both cultural and non-cultural settings, with serum not interfering.
• Efficacy was largely unaffected by pH and temperature, with some enhanced activity noted at pH 6.6.

Conclusions:

• Sodium dichloroisocyanurate exhibits broad-spectrum antimicrobial activity against bacteria, fungi, and protozoa.
• Its efficacy is robust, even in the presence of organic matter and under varying environmental conditions.
• Toxicological studies indicate no significant adverse effects at tested concentrations, supporting its safety for various applications.