Fungi promotes biodeterioration in water links

Abstract

The aqueous inks are subjected to microbiological contaminations that happen in humid or dry state and provoke biodeterioration. Some species of fungi grow and colonize the surface promoting a darkened color and destroying the film of the ink. Biocides are products incorporated to the ink, whose function is to protect the film both in the humid and in the dry state, aiming the inhibition of the growth of fungi, guaranteeing a larger durability of the painting. The constant emergence of fungi in walls of the recently painted residences became the objective of research of the present work. During the tests, fungi from contaminated walls of recently painted (eight months) residences were isolated and then inoculated in plates containing wateragar (WA) culture medium as control and other plates containing biocides or inks with biocides. The results showed that some isolates presented a little development in polyvinyl acrylic (PVA) latex-based inks containing biocides while others presented an increase in the development of colonies correlated with greater sporulation. Thus, it can be concluded that the concentration of biocides in the inks was insufficient or presented an inefficiency of the germicidal agents (bactericidal and fungicide), demonstrating that the fungi acquired resistance to the biocides.