Evaluation of Solid Disinfectants
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Solid disinfectants usually consist of a disinfectant substance diluted by an inert powder. Phenolic substances adsorbed onto kieselguhr (diatomite) form the basis of many disinfectant powders; another widely used solid disinfectant is sodium di-chloro-isocyanurate.
EVALUATION OF SOLID DISINFECTANTS
Solid disinfectants usually consist of a disinfectant substance diluted
by an inert powder. Phenolic substances adsorbed onto kieselguhr (diatomite)
form the basis of many disinfectant powders; another widely used solid
disinfectant is sodium di-chloro-isocyanurate. Other disinfectant or antiseptic
powders used in medicine include acriflavine and compounds with antifungal
activity such as zinc undecenoate or salicylic acid mixed with talc. These
disinfectants may be evaluated by applying them to suitable test organisms
growing on a solid agar medium. Discs may be cut from the agar and sub-cultured
for enumeration of survivors. Inhibitory activity is evaluated by dusting the
powders onto the surface of seeded agar plates, using the inert diluents as a
control. The extent of growth is then observed following incubation.
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