丝素蛋白改性涂膜处理对番茄保鲜效果研究

Effect of silk fibroin modified chitosan-cerium composite coating on tomato preservation

目的:为了研究不同浓度丝素蛋白改性壳聚糖铈涂膜处理对番茄采后的保鲜效果。方法:分别用蒸馏水、1%壳聚糖铈配合物、2%、4%、6%丝素蛋白改性壳聚糖铈配合物对番茄进行涂膜处理,并定期对各项理化指标进行测定。结果:表明丝素蛋白改性壳聚糖铈配合物能有效地降低番茄的失重率、呼吸速率,处理组均能抑制多酚氧化酶(PPO)活性上升,同时提高超氧化物歧化酶(SOD)、过氧化物酶(POD)的活性,与对照组相比有显著差异(p<0.05)。结论:壳聚糖铈配合物(处理1)相比,丝素蛋白的加入提高了番茄的保鲜效果,其中4%丝素蛋白-壳聚糖铈配合物涂膜处理对室温储藏番茄的保鲜效果最佳,在25℃的条件下,储藏时间比对照组提高23.65%,延长了果实的储藏时间,为番茄的室温短期贮藏提供一种新的方法。

In order to study the effects of different concentrations of silk fibroin modified chitosan cerium composite coating on tomato preservation. The samples were treated with distilled water, 1% chitosan cerium complex, 2%, 4% and 6% silk fibroin modified chitosan cerium complex, and the physical and chemical indexes were measured on a regular basis. The results showed that silk fibroin-modified chitosan-cerium complex could effectively decrease the weight loss rate and respiration rate of tomato. The treatment group could inhibit the activity of polyphenol oxidase（PPO） and increase the activity of superoxide dismutase（SOD）（P〈0.05）. Compared with chitosan-cerium complex（treatment 1）, the addition of silk fibroin increased the preservation effect of tomato, and the activity of peroxidase（POD）. The storage time of 4% silk fibroin-chitosan-cerium complex was the best at room temperature, and the storage time was 23.65% higher than that of the control group at 25 ℃, prolonging the storage time of fruit, which provides a new method for short-term storage of tomato at room temperature.