生物基聚丁内酰胺肠衣膜的性能分析

Analyzing the Properties of Bio-based Polybutyrolactam Sausage Casing

目的:以可降解生物基聚丁内酰胺(polybutyrolactam,PA4)为主体,采用流延法制备PA4肠衣膜,开发一种具备抗菌活性的可降解肠衣包装材料。方法:测定PA4肠衣膜的力学性能、阻水性能、阻氧性能、热收缩率、耐撕裂性能、总迁移量、抗菌性能和对猪肉香肠的保鲜性,并与市售尼龙复合肠衣、市售胶原蛋白肠衣进行比较。结果:PA4肠衣膜的拉伸强度为84.42 MPa,断裂伸长率为73.34%;氧气透过系数为2.448×10^-16 cm^3·cm/(cm^2·s·Pa),具有强阻氧性;此外,因含有抗菌活性成分——壳聚糖,PA4肠衣膜抗菌性能为3.13(lg(CFU/cm2)),抗菌性能良好,在4℃贮藏条件下,PA4肠衣膜包装的猪肉香肠贮存期为28 d。结论:PA4肠衣膜的综合性能与市售尼龙复合肠衣接近,明显优于市售胶原蛋白肠衣,可应用于低温肉制品包装,在肉类包装领域具有较好的应用前景。

Objective:To prepare a biodegradable antimicrobial packaging material from polybutyrolactam(PA4)by casting method for use as a sausage casing.Methods:The mechanical properties,water and oxygen barrier properties,heat shrinkage,tear resistance,overall migration and antibacterial properties of the PA4 film as well as its potential in preserving pork sausages were evaluated in comparison to a commercially available nylon composite casing and a commercially available collagen casing.Results:The PA4 sausage casing had a tensile strength of 84.42 MPa,an elongation at break of 73.34%,and an oxygen permeability coefficient of 2.448×10^-16 cm^3·cm/(cm^2·s·Pa),which indicates high oxygen barrier capacity.Besides,with the antibacterial ingredient chitosan,the casing film had good antibacterial performance,and its antibacterial performance value was 3.13(lg(CFU/cm2)).At 4℃,the storage period of pork sausages stuffed in this casing was 28 days.Conclusion:The comprehensive performance of the PA4 sausage casing was close to that of the commercially available nylon composite casing and significantly better than that of the commercially available collagen casing.The PA4 sausage casing can be applied to low-temperature meat packaging and is promising for application in the field of meat packaging.