迁西板栗天然复合保鲜剂保鲜技术研究

随着板栗种植面积的不断增加,板栗保鲜已成为果农提高经济收入的关键技术.羧甲基壳聚糖是壳聚糖的衍生物,是一种天然生物制剂,具有较好的抗菌保鲜功效.首次提出将羧甲基壳聚糖应用于板栗保鲜,并系统研究了此保鲜剂对板栗的作用机理及保鲜效果,旨在寻找一种适用于板栗的新型天然可食性复合保鲜技术,以提高板栗贮藏品质,调节延长板栗货架售期,实现效益最大化.以羧甲基壳聚糖溶液为主剂,通过添加最佳复合配比茶多酚抑菌成分,制成复合保鲜剂,在低温条件下对板栗进行保鲜,防止其在储藏过程中出现失水、霉变、发芽等问题,延长保鲜时间,提高商品率.以质量分数为2％的羧甲基壳聚糖为主剂,质量分数为0.02％的茶多酚为助剂,配成复合保鲜剂对板栗进行保鲜,在-3℃下贮存8个月,基本保持了板栗的新鲜度,好果率达97％以上,含糖量由原来的28.72％上升到32.14％,增加了3.42％,淀粉含量42.89％,蛋白质含量4.23％,失水率仅为2.1％,板栗外观新鲜,果仁无失水皱缩现象,保持了板栗原有的色、香、味.

Research of compound fesh-keeping agent technology for Qianxi chestnut

With the increasing of chestnut planting area,chestnut preservation has become a key technology to improve the economic income for farmers.Carboxymethyl chitosan,a natural biological agent that has good antibacterial effect,is a derivative of chitosan.The carboxymethyl chitosan is firstly advised to be used in chestnut preservation,and the preservation effect and the action mechanism are studied.The aim is to find a new natural edible composite fresh-keeping technology for chestnut,in order to improve the storage quality of chestnut,adjust and extend the shelf sales period,and achieve maximum benefit.With carboxymethyl chitosan as the main material,by adding the best composite ratio of tea polyphenols antibacterial components,compound antiseptic is made,which is used to preserve chestnut under low temperature conditions,preventing the problems of storage water loss,mildew and germination in deposit process,prolonging the preservation time,and raising commodity rate.Using the carboxymethyl chitosan with mass concentration of 2 ％ as the main agent,and 0.02 ％ tea polyphenols added to compound preservative to preserve chestnut,after 8 months of storage at-3 ℃,the chestnut freshness is basically maintained,good fruit rate is above 97％,sugar content increases from 28.72％ to 32.14％,which is an increase of 3.42％,starch content is 42.89％,the protein content is 4.23％,water loss rate is only 2.1％,the appearance remains fresh,nuts have no shrinkage phenomenon,and the original color,aroma and taste of chestnut is maintained.