改性水滑石/聚乙烯复合抗菌薄膜对菜心保鲜效果的影响

Effect of Modified Hydrotalcite/Polyethylene Composite Antimicrobial Films on the Preservation of Chinese Flowering Cabbage

中文关键词: 改性水滑石  聚乙烯薄膜  菜心  贮存  保鲜

英文关键词: modified hydrotalcite  polyethylene films  Chinese flowering cabbage  storage  preservation

中文摘要:

      目的 探究自制改性水滑石复合抗菌薄膜对菜心的保鲜效果。方法 将5-甲酰基水杨酸插层的水滑石(FSA-LDHs)添加到线性低密度聚乙烯中，通过挤出流延工艺制备FSA-LDHs/PE复合抗菌薄膜，并进行菜心保鲜实验。将菜心分为FSA-LDHs/PE复合抗菌薄膜组、纯聚乙烯(PE)薄膜组、无包装组，在(4±1)℃条件下储存11 d，定期取出菜心样品进行品质指标表征，通过对比菜心相关品质指标评价其保鲜效果。结果 自制FSA-LDHs复合抗菌薄膜的结晶性提高，比纯PE薄膜的氧气透过率降低了81.2%，水蒸气透过率降低了46.9%，对大肠杆菌和金黄色葡萄球菌的抗菌能力分别提升了29.6%和22.7%。有效降低了氧气和水蒸气透过率，提升了薄膜抗菌能力。在保鲜实验上，其抑制了质量损失率、丙二醛积累和过氧化物酶活性的增加，并减缓了茎部硬度、叶绿素、类胡萝卜素、维生素C、总酚和类黄酮含量的下降。FSA-LDHs/PE复合抗菌薄膜的保鲜效果优于纯PE薄膜组及无包装组。结论 FSA-LDHs/PE复合抗菌薄膜较纯PE薄膜对菜心有更好的保鲜效果，能够将其保质期延长3~5 d，可替代纯PE薄膜用于果蔬保鲜。

英文摘要:

      The work aims to investigate the effect of self-made modified hydrotalcite antibacterial composite films on the preservation of Chinese flowering cabbage. 5-formylsalicylic acid intercalated hydrotalcites (FSA-LDHs) were added to linear low-density polyethylene. FSA-LDHs/PE composite antimicrobial films were prepared through the extrusion casting process and were tested for the preservation effect on Chinese flowering cabbage. Chinese flowering cabbage was put under FSA-LDHs/PE composite antimicrobial films group, pure polyethylene (PE) films group, and no-packaging group and stored at (4±1) °C for 11 days. The Chinese flowering cabbage was periodically taken out for the characterization of quality indexes, and the preservation effect was evaluated by comparing the relevant quality indexes. The self-made FSA-LDHs composite antimicrobial films showed improved crystallinity, with oxygen permeability decreasing by 81.2% and water vapor permeability decreasing by 46.9% compared to the pure PE films. The antibacterial ability against Escherichia coli and Staphylococcus aureus increased by 29.6% and 22.7%, respectively. This effectively reduced the transmission rate of oxygen and water vapor, and improved the antibacterial ability of the films. In the preservation experiment, it inhibited the increase of weight loss rate, malondialdehyde accumulation and peroxidase activity, and slowed down the decline of stem hardness, chlorophyll, carotenoids, vitamin C, total phenols and flavonoids. The preservation effect of FSA-LDHs/PE composite antibacterial films was better than that of the pure PE films group and the no-packaging group. Compared with pure PE films, the FSA-LDHs/PE composite antibacterial films has a better preservation effect on Chinese flowering cabbage, extending the shelf life by 3-5 days and can replace pure PE films for fruit and vegetable preservation.