Antibacterial Activity of Basic Dyes on the Dyed Acrylic Fibers.

Abstract

Antimicrobial activiy against 2 species bacteria of six basic dyes and Benzalkonium chloride as a retarding agent in the dyed acrylic fibers was investigated by mean of JIS test method (JIS L1902). To examine the effect of the dye concentration in the dyed fibers on antibacterial activity, it was represented by SOR that is the ratio of dye concentration in the dyed fibers to its relattive saturation value. Result of JIS test method demonstrated that antibacterial activity of the dyed fibers was obviously revealed and related to minimum bactericidal concentration (MBC) of the respective dyes and Benzalkonium chloride depending on the chemical structure of them. Antibacterial activities in the dyed fibers with the basic dyes of triphenyl-methane, azine, azo and thiazine were compared, which decreased in that order. And antibacterial activity was apt to increase with SOR. Bactericidal activity against Staphylococcus aureus IFO12732 was shown in all dyes except thiazine, whereas that against Escherichia coli K12 W3110 was low activity. Benzalkonium chloride was equally effective against both bacteria and improved antibacterial activity in the dyed fibers with lower SOR level of Malachite Green.