摘要
[Objectives]This study was conducted to investigate the formulation stability of 20% sodium dichloroisocyanurate powder and its killing effect on common pathogenic bacteria in the animal breeding environment and to provide a scientific basis for veterinary clinical application. [Methods] The stability of 20% sodium dichloroisocyanurate powder was tested through an accelerated test and a long-term test. In the accelerated test, 20% sodium dichloroisocyanurate powder and sodium hypochlorite were stored in 37 ℃ constant temperature incubators for 90 d, and the available chlorine contents were compared. In the long-term test, 20% sodium dichloroisocyanurate powder was sealed and stored at room temperature, and its effective chlorine content and pH were measured regularly. In order to test its bactericidal effect in clinical use, 20% sodium dichloroisocyanurate powder, lime milk and 5% dilute glutaraldehyde solution were sprayed in groups to disinfect empty sheds in a pig farm, and the total colony count, Escherichia coli colony count, Staphylococcus aureus colony count and fungal colony count were used as testing indexes to comprehensively evaluate the disinfection effects on microorganisms in the air of the empty sheds and the surface of objects inside the sheds after disinfection. [Results] The 20% sodium dichloroisocyanurate powder had an available chlorine loss rate of 7.92% in the accelerated test, and the loss rates of available chlorine content and pH of 20% sodium dichloroisocyanurate powder in the long-term test(240 d) were 1.52% and 1.87% at room temperature, respectively. In the test to detect the sterilization effects on the pig farm, the total colony count, E. coli colony count, S. aureus colony count and fungal colony count of samples treated with 20% sodium dichloroisocyanurate powder were lower than those of other two groups(P<0.05), and the total colony count of samples disinfected with 20% sodium dichloroisocyanurate powder after cleaning the dirt was 20 times lower than that of samples disinfected directly without cleaning. In conclusion, 20% sodium dichloroisocyanurate powder was stable and effective in disinfection, and the presence of organic matter had little effect on the disinfection effect. [Conclusions] This study will provide important reference for the application of 20% sodium dichloroisocyanurate powder in veterinary clinic.
