Bactericidal Effect of Disinfectant Biospot(R) Against Clinical Isolates

Kim, Sang Il; Shin, Jung Hee; Kim, Yo Suk; Lee, Ji Young; Wie, Sung Hun; Choi, Su Mi; Kim, Yang Ree; Kang, Moon Won

Abstract

BACKGROUND
Numerous disinfectants are available for disinfection and sterilization in the hospital environment but it is difficult to select an appropriate one. Biospot(R) is a chlorine-based disinfectant that consists of sodium dichloroisocyanurates. We evaluated the bactericidal effect of Biospot(R) against clinical isolates and compared it with that of other disinfectants. METHOD: Biospot(R), Wydex(R), HiCLO-S(R), Vipon(R), 70% ethanol, and 3% boric acid were evaluated. Clinical isolates were cultured from the patients in Kangnam St. Mary's hospital. There were two strains of Escherichia coli, methicillin-susceptible Staphylococcus aureus, methicillin-resistant Staphylococcus aureus, Klebsiella pneumoniae, vancomycin-resistant Enterococcus faecium, Pseudomonas aeruginosa, coagulase-negative staphylococcus, Streptococcus pneumoniae, and Bacillus subtilis. One strain of Candida albicans was included. Each strain was exposed to disinfectants for 0.5, 1, 2, 4, 8, and 15 minutes.
RESULTS
All the non-spore forming bacteria were killed within 30 seconds in Biospot(R) (30 ppm of sodium dichloroisocyanurate). Wydex(R) (2% glutaraldehyde), HiCLO-S(R) (hypochlorous add 30ppm and electrolyzed oxidized water), Vipon(R) (50ppm of sodium hypochlorite), and 70% ethanol, but not in boric acid. Candida albicans were killed in 30 seconds with 100 ppm of BiOSpot(R) and all of disinfectants except boric acid. Bacillus subtilis, the spore forming bacteria, was killed in 4 minutes with 50 ppm, 2 minutes with 100 ppm of Btospot. Other disinfectants such as Vipon(R) killed Bacillus subtilis in 8 minutes. But Wydex(R), HiCLO-S(R), 70% ethanol, and boric acid could not kill the strain until 15 minutes.
CONCLUSIONS
Biospot(R) was an effective and useful disinfectant against most common clinical isolates including fungus and spore forming bacteria.