不同涂膜处理对鲜切铁棍山药品质的影响

摘要

以壳聚糖和海藻酸钠为保鲜剂,对鲜切铁棍山药进行涂膜保鲜,每隔2d测定失重率、Vc含量、可滴定酸含量、褐变度、可溶性固形物含量、多酚氧化酶活性等指标研究保鲜效果。同时以空白组、壳聚糖涂膜组作为对照。结果表明：壳聚糖浓度为1.2%的单一膜和1.2%壳聚糖、0.2%海藻酸钠复合膜都能有效地抑制鲜切铁棍山药的褐变,降低失重率,减少营养物质的损失。复合膜的保鲜效果最好。%Fresh-cut Dioscorea opposita Thunb.cv.Tiegun were coated with edible film composed of chitosan and sodium alginate.Every two days the weight loss rate,Vc content,titratable acid content,browning,soluble solid content,PPO activity were measured to study the preservation effect.The untreated group and chitosan single coating film group were compared.The results showed that the 1.2% chitosan single coating film and 1.2%-chitosan-0.2%-sodium-alginate composite film could effectively reduce the browning,weight loss rate and nutrient loss.The best preservation effects were achieved by compound coating film.