超临界流体技术制备肉桂醛/壳聚糖膜抑菌包装材料

Preparation of Cinnamaldehyde/Chitosan Film as Antimicrobial Packaging Using Supercritical Fluid Technology

采用超临界溶液浸渍技术(SSI)将肉桂醛(CI)负载于壳聚糖膜(CSF)中制备抑菌材料,研究了SSI过程参数对肉桂醛负载量的影响,并对CI-CSF的形貌、水蒸气透过率、不透明度和抑菌性能进行了考察。结果表明,CI-CSF的负载量随着泄压速度的升高而降低,在压力15 MPa、泄压速度1 MPa/min时负载量达到最大为2.44%。CSF经SSI过程负载肉桂醛后,水蒸气透过率由0.96×10^-10 g·m^-1·s^-1·Pa^-1增大至2.72×10^-10 g·m^-1·s^-1·Pa^-1,不透明度由1.31 mm^-1升高至4.59 mm^-1。CI-CSF对金黄色葡萄球菌和大肠杆菌表现出较好的抑制作用,抑菌圈分别达到17.3和16.0 mm,在食品活性包装领域具有应用潜力。

Chitosan film(CSF)loaded with cinnamaldehyde(CI)for antimicrobial packaging was prepared using supercritical solution impregnation(SSI). The effects of impregnation pressure and depressurization rate on loading capacity(LC)of CI-CSF were investigated,and the properties of CI-CSF were characterized such as morphology,water vapor permeability(WVP),opacity and antibacterial tests. The results showed that LC of CI-CSF decreased with the raise of the depressurization rate,and the maximum LC achieved to 2.44% at 15 MPa and 1 MPa/min. After the SSI process,the WVP of CI-CSF increased from 0.96×10^-10 g·m^-1·s^-1·Pa^-1 to 2.72×10^-10 g·m^-1·s^-1·Pa^-1 while the opacity of CI-CSF increased from 1.31 to 4.59 mm-1.CI-CSF showed good antibacterial activity against Staphlycoccus aureus and E.coli. with inhibition zones of 17.3 and 16.0 mm,respectively. The cinnamaldehyde loaded chitosan film prepared using supercritical solution impregnation process was promising for potential application in active food packaging.