Antibacterial activity of HBP-HTC and mulberry silk fabric finished by it

A quaternary ammonium compound,2-hydroxypropyltrimethylammonium chloride amino-terminated hyperbranched polymer(HBP-HTC) was applied to mulberry silk fabrics in order to prepare antibacterial mulberry silk fabrics.The antibacterial property of both HBP-HTC aqueous solution and the treated silk fabrics were tested.The Oxford plate diffusion experiment showed that HBP-HTC aqueous solution had excellent antibacterial activity againstStaphylococcus aureus(S.aureus) andEscherichia coli(E.coli).Increasing the amount of quaternary ammonium salt groups grafted on the amino-terminated hyperbranched polymer and the concentration of HBP-HTC,the antibacterial property of the product was enhanced.The growth kinetics curves ofS.aureusandE.colialso showed that excellent antibacterial properties of HBP-HTC was observed when the mass concentration of HBP-HTC solution was 20 mg/L.Silk fabric treated with 5 g/L HBP-HTC showed the bacterial inhibiting rate more than 99%.The durability of the antibacterial silk fabrics treated with HBP-HTC was satisfactory,and dyeing process had little influence on the antibacterial property.