Antibacterial Properties of Starch Blending with Glycidyl Trimethyl Ammonium Chloride and Potassium Sorbate Used in Medical Dressings

摘要

Starch is easy to breed bacteria,which affects its performance and application in medical dressings.In this research,antibacterial starch was prepared by physical blending method with glycidyl trimethyl ammonium chloride (GTA) and potassium sorbate as antibacterial agents.The antibacterial activities of GTA,potassium sorbate,GTA-starch and potassium sorbate-starch were investigated with the purpose of understanding the growth of bacteria in starch system.Results showed that GTA had good antibacterial activity,and the bacteriostasis rate of 0.05 g/mL GTA against Staphylococcus aureus (S.aureus) was 96.55％.The antibacterial properties of starch increased with an increase of mass fraction of potassium sorbate and then decreased with the continuously increasing of mass fraction of GTA.GTA-starch with 30 ％ GTA showed the best antibacterial activities,the bacteriostasis rate of Escherichia coli (E.coli) and S.aureus were 26.48 ％ and 20.26 ％,respectively;50 ％ potassium sorbate in potassium sorbatestarch showed the best antibacterial activities,the bacteriostasis rate of E.coli and S.aureus were 67.68 ％ and 74.75 ％,respectively.