1-甲基环丙烯与纳米分子筛共混聚乙烯膜对水蜜桃低温贮藏期间品质及氧化应激的影响研究

Study on the effects of 1-methylcyclopropene and nano molecular sieve blended polyethylene film on the quality and oxidative stress of Prunus persica during cold storage

中文关键词:  水蜜桃  ZSM-5  纳米分子筛  1-甲基环丙烯  

英文关键词:Prunus persica  ZSM-5  nano molecular sieves  1-methylcyclopropene

中文摘要:

      目的 探讨1-甲基环丙烯(1-methylcyclopropene, 1-MCP)和ZSM-5纳米分子筛共混聚乙烯膜对水蜜桃在低温贮藏期间品质及氧化应激的影响。方法 设立4种处理: 聚乙烯(polyethylene, PE)包装(P组)、PE包装联合1-MCP (PM组)、ZSM-5纳米分子筛共混PE膜(PN组)及两者联合(PMN组)。样品在0~2 ℃条件下贮藏, 每7 d共35 d取样, 进行质构、色差、可溶性固形物、可滴定酸、电导率等理化指标及多酚氧化酶(polyphenol oxidase, PPO)、过氧化物酶(peroxidase, POD)、超氧化物歧化酶(superoxide dismutase, SOD)等活性测定与丙二醛(malondialdehyde, MDA)含量测定。结果 1-MCP和纳米分子筛共混PE膜有效抑制了果实的软化、色变和纤维化。第21 d时, PM组和PMN组果实硬度极显著高于其他组(P<0.01); PMN组在第27 d的内聚性极显著低于P组(P<0.01)。色差分析表明, 与P组相比, 其他处理组的果皮红色和黄色变化显著减少(P<0.05), PMN组在第35 d的颜色较黄, 但过熟过程得到抑制。理化指标方面, PM组和PMN组的电导率比值和可滴定酸损失极显著低于P组(P<0.01), 表明1-MCP和纳米分子筛共混PE膜能有效减缓细胞膜透性增加和滋味与营养物质降低。生理指标显示, 第35 d PMN组的MDA水平极显著低于P组(P<0.01), POD和PPO活性峰值时间延迟, PMN组的PPO活性极显著低于P组(P<0.01)。结论 1-MCP和ZSM-5纳米分子筛共混PE膜的联合使用显著缓解了水蜜桃在低温贮藏期间的色变、过熟和氧化应激, 具有良好的应用前景。

英文摘要:

      Objective To investigate the effects of 1-methylcyclopropene (1-MCP) and ZSM-5 nano molecular sieve blended polyethylene (PE) film on the quality and oxidative stress of Prunus persica during cold storage. Methods The 4 kinds of treatments were set up: PE packaging (P), PE packaging combined with 1-MCP (PM), PE film blended with ZSM-5 Nano molecular sieve blended polyethylene film (PN), and the combination of ZSM-5 and 1-MCP (PMN). Samples were stored at 0–2 °C for 35 days with sampling every 7 days. Texture, chromatic indexes, soluble solids content, titratable acidity, electrical conductivity, and the activities or content of polyphenol oxidase (PPO), peroxidase (POD), superoxide dismutase (SOD) and malondialdehyde (MDA) were measured. Results 1-MCP and the nano molecular sieve blended polyethylene film effectively inhibited fruit softening, color change and fibrosis. On day 21, the fruit hardness in the PM and PMN groups was significantly higher than in other groups (P<0.01), while the cohesiveness of the PMN group was significantly lower than the P group on day 27 (P<0.01). Color analysis showed that the redness and yellowness changes in other treated groups were significantly reduced compared to the P group (P<0.05). Although the PMN group’s fruit appeared more yellow by day 35, the over-ripening process was suppressed. In terms of physicochemical indicators, the PM and PMN groups exhibited significantly lower electrical conductivity ratio and titratable acidity lose than the P group (P<0.01), indicating that 1-MCP and the nano molecular sieve blended polyethylene film effectively slowed down the increase in cell membrane permeability and the decrease in flavor and nutrients. Physiological measurements showed that by day 35, the MDA level in the PMN group was significantly lower than in the P group (P<0.01), with delayed peak POD and PPO activities. The PMN group’s PPO activity was significantly lower than the P group (P<0.01). Conclusion The combination of 1-MCP and ZSM-5 nano molecular sieve blended polyethylene film significantly alleviates color change, over-ripening, and oxidative stress in Prunus persica during cold storage, demonstrating promising application potential.