Contaminação microbiológica de tintas à base d’água de uma indústria do estado do Paraná, Brasil.

Abstract

A paint company in the state of Paraná in Brazil had several batches of water-based acrylic paints contaminated with microorganisms. Three fungi and one bacterium were isolated. The bacterium was identifed as Stenotrophomonas maltophilia. Three commercial fungicides (Fungicide I, II and III) and three bactericides (Bactericide I, II and III) were evaluated in attempts to prevent microbial growth. Fungicide II (1 g/L) was the most effcient fungicide of fungal isolates A and B, while Fungicide I was a better inhibitor of isolate C at the lowest concentrations studied. Bactericide II and III inhibited bacterial isolate at a concentration of 1 g/L, while 2 g/L of Bactericide I did not inhibited its growth. Inhibition tests were standardized and used to quantitatively evaluate the bactericides demonstrating that Bactericide III (2 g/L) inhibited 80 % of bacterial isolate.