a b s t r a c t
This study aimed at improving the functionality of linen fabric by antimicrobial finishing with the use of
ionic liquid, i.e., quaternary ammonium salt. Antimicrobial activity of ionic liquids strongly depends on
their structure. An ammonium-based ionic liquid with nitrate anion named didecyldimethylammonium
nitrate e [DDA][NO3] ewas tested. The study included testing the susceptibility of linen fabric protected
with this salt to the biodeterioration process with special attention paid to fungi resistance. Finished
linen fabric was tested in relation to the action of five mildew mixtures. The degree of microorganism
growth and its effect on physicalemechanical properties of the fabrics were evaluated. The antimicrobial
effectiveness of ionic liquid applied to linen fabric was determined by the use of SEM. Applying this
biocide in the finishing processes of natural textile materials allows the attainment of antimicrobial
barrier properties.