Preparation and Properties of Antimicrobial Starch-PVA Hydrogel

Starch grafted oligoguanidine(S-PHMG) was synthesized using epichlorohydrin as the bonding agent.Orthogonal tests were applied to optimize the reaction conditions.Antimicrobial starch-PVA hydrogels were synthesized from chemical crosslinked of starch,PVA and S-PHMG.The reswelling rate,dewatering rate and antimicrobial activity were determined.Results showed that the grafting efficiency could reach 22.15% at the optimal conditions: temperature 40 °C,time 0.5 h,pH=9.The reswelling rates of the hydrogels decreased with the increasing of PVA content,while increased at first and then decreased with the increasing of the crosslinker contents.S-PVA hydrogels exhibited high antimicrobial activities against both E.coli and S.aureus.When w(PHMG)=0.2%,the growth inhibition reached 100%.