增塑剂对壳聚糖-小檗碱复合膜物理和抗菌性能的影响

Influence of plasticizers on the physical performance and antimicrobial activity of a chitosan-berberine composite membrane

The mechanical properties and antimicrobial activity of a chitosan-berberine composite film with added non-toxic edible industrial plasticizers,including triethyl citrate,triethyl 2-acetyl citrate,tributyl citrate and acetyl tributyl citrate,have been studied.The optimal blends were selected by orthogonal tests.The optimized film solutions were blended with chitosan at a concentration of 0.02g/mL,glycerol at a concentration of 0.0125g/mL and a plasticizer volume fraction of 0.75% at 60 ℃.Addition of plasticizer to the composite film did not significantly affect its inhibition on Monilinia fructicola by inhibitory zone.The rate of weight loss and the infection index on each day were investigated for peaches packed in the composite membrane.It was found that the weight loss of peaches treated for 10 days was slightly over 30% and the infection index was nearly 60%,both of which are lower than the respective values of 45% and nearly 90% for the control.Finally,the release characteristics in vitro were determined by a slow-release test,which revealed that the composite film exhibited slow-release behavior.