纳米抗菌包装材料对延缓白莲藕风味品质劣变的影响  

Effect of Nanocomposite Antibacterial Packaging on Preserving Flavor Quality of White Lotus Roots

作　　者：孙世旭 李莉[1] 韩祥稳 周游[1] 曹崇江[1] SUN Shixu;LI Li;HAN Xiangwen;ZHOU You;CAO Chongjiang(College of Food Science and Engineering,Nanjing University of Finance and Economics,Nanjing 210003,China)

机构地区：[1]南京财经大学食品科学与工程学院,江苏南京210003

出　　处：《食品科学》2019年第7期212-218,共7页Food Science

基　　金："十三五"国家重点研发计划重点专项(2016YFD0400901);国家自然科学基金面上项目(31571901)

摘　　要：为解决白莲藕在贮运过程中风味品质劣变的问题,制备纳米抗菌包装材料延缓白莲藕衰老,将白莲藕分别包装在普通包装材料与纳米抗菌包装材料中,抽真空后贮藏在25℃、相对湿度35%条件下,每4 d取样测定白莲藕的丙二醛(malondialdehyde,MDA)含量和总酚含量,并测定贮藏20 d的普通包装和纳米抗菌包装白莲藕的挥发性组分代谢相关基因表达水平。通过电子鼻、气相色谱-质谱分析纳米抗菌包装材料对白莲藕风味的影响。结果表明:在贮藏末期,纳米抗菌包装组白莲藕体内MDA、总酚含量分别为0.865 4 mmol/g、5.873 mg/100 g,在贮藏过程中,纳米抗菌包装组白莲藕超氧化物歧化酶、过氧化氢酶活力高于普通包装,说明纳米抗菌包装可抑制白莲藕的衰老;另外,纳米抗菌包装可以调节白莲藕挥发性组分代谢相关基因的表达。研究证实真空贮藏条件下纳米抗菌包装材料能够调节白莲藕的基因表达,从而进一步影响莲藕品质。This study aimed to solve the problem of quality deterioration in white lotus roots during storage. A nanocomposite antibacterial packaging was prepared to delay the senescence of white lotus roots. Samples were subjected to normal packaging (NP) or nanocomposite antibacterial packaging (AP) and then storage at 25 ℃and 35% relative humidity after vacuuming. Every 4 days, malondialdehyde (MDA) and total phenol (TP) contents were determined and the expression of genes related to volatile compound metabolism was evaluated on the 20 th day of storage. The effect of the nanocomposite antibacterial packaging on the flavor quality was analyzed by electronic nose and gas chromatography-mass spectrometry (GC-MS). The results showed that MDA and TP levels in AP samples were 0.865 4 mmol/g and 5.873 mg/100 g at the end of the storage process, respectively. The activity of SOD and CAT in AP samples was higher than in control samples, indicating that AP inhibited the senescence of white lotus roots. In addition, the nanocomposite antibacterial packaging could regulate the expression of genes related to the metabolism of volatile components in white lotus roots. This study confirmed that the nanocomposite antibacterial packaging could preserve the quality of white lotus roots by regulating the expression of volatile metabolism-related genes.

关 键 词：白莲藕 纳米抗菌包装 丙二醛 总酚 挥发性组分 基因表达 

分 类 号：S645.1[农业科学—蔬菜学]