Factors affecting sensitivity of Staphylococcus aureus 196E to polyphosphates.
AUTOR(ES)
Jen, C M
RESUMO
The effect of polyphosphates (eight compounds) on growth of Staphylococcus aureus 196E in brain heart infusion broth was studied. The organism was sensitive (in decreasing order) to chain polyphosphates with 21, 3, 13, and 15 PO4 groups, and bactericidal effects were observed with 0.5% of these compounds. No inhibition was effected by PPi or a metaphosphate. The inhibitory effects were pH dependent, and bacterial sensitivity was highest at pH greater than 7.4. Initial populations affected the number of survivors. No growth was observed after 24 h at 35 degrees C when the initial cell population was less than 10(4) CFU/ml, and a 100- to 1,000-fold decline in cell numbers occurred when initial populations were higher than 10(4) CFU/ml. Sodium tripolyphosphate produced less inhibition after heat sterilization (15 min, 121 degrees C) than after filter sterilization, whereas sodium hexametaphosphate (n = 21) retained most of its antimicrobial activity after heat sterilization. Supplementation of broth with Mg2+ was effective in overcoming inhibition by 0.5% sodium tripolyphosphate, and an addition of 0.25 to 1.0 mM cation restored most of the growth. Inhibition was partially eliminated by Ca2+ and Fe2+, but not by Zn2+ or Mn2+.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=239124Documentos Relacionados
- Factors Affecting the Persistence of Staphylococcus aureus on Fabrics
- Factors Affecting the Collagen Binding Capacity of Staphylococcus aureus
- Factors Affecting Competence for Transformation in Staphylococcus aureus
- Factors Affecting the Resistance of Staphylococcus aureus to Hydrogen Peroxide Treatments in Milk
- FACTORS AFFECTING GROWTH OF STAPHYLOCOCCUS AUREUS L FORMS ON SEMIDEFINED MEDIUM