Antimicrobial and Antibacterial Finishes

Antimicrobial finishes inhibit growth of bacteria, fungi, and microorganisms via biocides or physical mechanisms preventing odor, infection, and material degradation. Silver-based treatments (nanosilver 10-100 nm particles or ionic silver complexes) provide broad-spectrum efficacy achieving 99.9% bacteria reduction, wash durable 20-50 cycles, used in medical textiles, sportswear, and socks. Quaternary ammonium compounds (QACs) bind to fabric creating positively-charged surface disrupting microbial cell membranes, durable to 50+ washes. Triclosan and triclocarban face regulatory restrictions due to environmental concerns and resistance development. Natural antimicrobials include chitosan (from shellfish, biodegradable, moderate efficacy), essential oils (thyme, tea tree encapsulated for controlled release), and enzyme treatments. Testing via AATCC 100 quantitative method (measuring CFU reduction) and AATCC 147 qualitative agar diffusion (zone of inhibition). Applications include healthcare textiles (hospital linens, scrubs, wound dressings preventing nosocomial infections), sportswear and activewear (odor control), socks and intimate apparel, and public textiles (hospitality, transportation). Regulations include EPA registration for biocidal claims, EU BPR compliance, and Oeko-Tex restrictions on certain antimicrobials with emerging focus on non-leaching, durable, and environmentally benign alternatives.