植物精油壳聚糖基活性包装膜的制备及保鲜效果研究

Study on preparation and fresh-keeping effect of chitosan-based active packaging film of plant essential oil

以龙眼核精油为活性成分的壳聚糖为基膜材料制备具有抗菌抗氧化性能的绿色环保可降解的复合膜,并利用鸡蛋进行保鲜效果研究。用4种不同有机溶剂提取龙眼核精油,并通过单因素实验测定4种不同龙眼核精油其抗氧化性及抑菌性能,选取最优龙眼核精油与壳聚糖配制对鸡蛋进行涂膜研究其对鸡蛋的保鲜效果,并运用流延法制备活性包装膜以及测定包装膜的性能。4种提取剂中,乙醇所提取的龙眼核精对自由基清除效果最佳且有明显抑菌效果。鸡蛋在贮藏第0、7、14、21、28天的鸡蛋各指标的检测结果表明,壳聚糖涂膜和龙眼核精油涂膜对鸡蛋均具有保鲜效果,通过与空白组的比较,综合检测指标结果表明,龙眼核精油对鸡蛋的保鲜效果最好。龙眼核精油-壳聚糖复配制得的活性包装膜在抑菌方面效果优于壳聚糖膜并且力学性能优良。龙眼核精油与壳聚糖复配制得的活性包装膜有良好的抗氧化及抑菌性能,并且对鸡蛋的保鲜效果有增强作用。

The green,environment-friendly and degradable composite film with antibacterial and anti-oxidation properties was prepared by using chitosan as the active component of longan kernel essential oil,and the preservation effect of the egg was studied.Longan kernel essential oil was extracted with four different organic solvents,and its antioxidant and bacteriostatic properties were determined by a single-factor experiment.The best eulongan nuclear essential oil and chitosan were selected to prepare egg coating to study its preservation effect on eggs,and the active packaging film was prepared by casting method and the properties of the film were measured.Among the four extracts,the essential oil extracted by ethanol had the best scavenging effect on free radicals and an obvious bacteriostatic effect.Results showed that chitosan coating and longan kernel essential oil coating had good effects on egg preservation at 0,7,14,21,and 28 days of storage.Compared with the blank group,longan seed essential oil had the best effect on egg preservation.The active packaging film prepared by the combination of longan kernel essential oil and chitosan had good antioxidant and bacteriostatic properties and could enhance the preservation effect of eggs.