魔芋葡甘聚糖基活性纳米复合膜的构建及性能研究

目的 对魔芋葡甘聚糖(konjac glucomannan, KGM)薄膜进行改良。方法 以KGM为基质, 棉花纤维素纳米晶须(cellulose nanocrystals, CNC)作为增强剂, 马尾藻多酚(phlorotannins from Sargassum, PS)为抗菌抗氧化剂, 通过物理性能、自由基清除能力和抗菌性检测, 筛选KGM/CNC/PS活性纳米复合膜包装材料。该包装材料运用在鲜猪肉保鲜上时, 以菌落总数(total bacterial count, TBC)、总挥发性盐基氮(total volatile base nitrogen, TVB-N)、硫代巴比妥酸反应物(thiobarbituric acid reactive substances, TBARS)、pH等指标判断鲜猪肉腐败变质程度。结果 当质量比KGM:CNC:PS=100:9:9.81 (KCP-9)时, KGM/CNC/PS活性纳米复合膜的热稳定性、力学性能、水蒸气阻隔性能相对其他比例的复合膜显著提高, KGM:CNC:PS=100:9:18.53 (KCP-17)时, 抗氧化和抗菌性能最佳, 后者运用在鲜猪肉上时, TBC、TVB-N、TBARS、pH等指标明显优于对照组中不使用任何保鲜剂的猪肉, 可延缓鲜猪肉腐败变质速度, 延长其货架期。结论 当KGM:CNC:PS=100:9:18.53 (KCP-17)时, KGM/CNC/PS活性纳米复合膜包装材料具有良好的抗氧化和抗菌性, 在食品保鲜领域具有潜在的应用前景, 本研究可为提高食品包装材料机械性能、抗菌性和抗氧化能力研究提供参考。

Construction and properties of konjac glucomannan-based active nanocomposite membranes

To improve the characteristics properties of konjac glucomannan (KGM) film. Methods KGM/CNC/PS active nanocomposite membrane was constructed with KGM as the matrix, cellulose nanocrystals (CNC) as the enhancer and phlorotannins from Sargassum (PS) as the antibacterial and antioxidant agent. KGM/CNC/PS active nanocomposite membrane packaging materials were screened through physical properties, free radical scavenging ability and antibacterial activity, which was used to package fresh pork, and the rotting rate of fresh pork was determined by the total bacterial count (TBC), total volatile base nitrogen (TVB-N), thiobarbituric acid reactive substances (TBARS), pH and others. Results When the mass ratio of KGM:CNC:PS=100:9:9.81 (KCP-9), comparing with other proportionscomposite films, the active nanocomposite membrane was significantly improved of the thermal stability, mechanical properties, water vapor barrier properties. When the mass ratio of KGM:CNC:PS=100:9:18.53 (KCP-17), the active nanocomposite membrane has a higher antioxidant and antibacterial properties. The film was applied to fresh pork, TBC, TVB-N, TBARS, pH and others were significantly better than pork without any preservative in the control group. It determined that KGM/CNC/PS active nanocomposite membrane could delay the deterioration rate and extend its shelf life of fresh pork. Conclusion When the mass ratio of KGM:CNC:PS=100:9:18.53 (KCP-17), the prepared KGM/CNC/PS active nanocomposite membrane have good antioxidant and antibacterial properties, and it has potential application prospects in the field of food preservation.This study provides a reference for improving the mechanical properties, antibacterial and antioxidant capacity of food packaging materials.