纤维素复合抗菌保鲜膜包覆对采后蓝莓的保鲜效果

本论文以玉米秸秆制备的再生纤维素膜共混茶多酚和蒲公英提取物制备而成的不同纤维素保鲜膜为材料包覆蓝莓,通过测定蓝莓的腐烂率、失重率、可溶性固形物含量、纤维素C含量、丙二醛含量、花青素含量和果实硬度,分析不同保鲜膜对蓝莓的保鲜效果。首先制备分别为30%复合保鲜剂的纤维素保鲜膜(15%蒲公英提取物+15%茶多酚)、30%蒲公英提取物的纤维素抗菌膜、30%茶多酚的纤维素保鲜膜,再将不同种类的保鲜膜用于蓝莓的包覆,并分析保鲜效果。结果表明,30%纤维素复合保鲜膜保鲜后蓝莓的果实硬度、失重率、V_C含量、花青素含量等指标较对照组再生纤维素膜包装有所改善,14 d时蓝莓的果实硬度为对照组的3.14倍,失重率为对照组的59.1%,V_C含量为对照组的1.70倍,花青素的含量为对照组的1.48倍。综合来看,30%纤维素复合保鲜膜对蓝莓保鲜的效果明显,是一种具有良好保鲜性能的薄膜材料。

Fresh-keeping Effect of Cellulose Composite Antibacterial Preservative Film on Postharvest Blueberry

In this paper,blueberries were coated with different cellulose fresh-keeping films prepared by blending tea polyphenols and dandelion extracts from corn straw. The effects of different fresh-keeping films on blueberries were analyzed by measuring the rotting rate,weight loss rate,soluble solids content,cellulose C content,malondialdehyde content,anthocyanin content and fruit hardness. Firstly,cellulose fresh-keeping films(15% dandelion extract+15% tea polyphenols),cellulose antibacterial films(30% dandelion extract)and cellulose preservative films(30% tea polyphenols)with 30% composite preservative were prepared respectively,and then different kinds of preservative films were applied to cover blueberries to analyze the preservation effect. The results showed that,fruit firmness,weight loss rate,V_C content and anthocyanin content of blueberries after preservation with cellulose composite film were improved compared with those of control group recycled cellulose film packaging. On the 14th day,fruit firmness of blueberry was 3.14 times of the control group,weight loss rate was 59.1% of the control group,and the V_C content was 1.70 times of the control group,anthocyanin content was 1.48 times of the control group. In conclusion,30% cellulose composite fresh-keeping film has obvious effect on blueberry fresh-keeping,and it is a kind of film material with good fresh-keeping performance.