具有高阻氧、阻湿性聚乳酸基共混膜的制备及其对酸奶的保鲜效果  

Preparation of Poly(L-lactic Acid)-based Blended Film with High Oxygen and Moisture Barrier Properties and Its Effect on Preservation of Yogurt

作　　者：安达 孙嘉茂 葛晨 云雪艳 AN Da;SUN Jiamao;GE Chen;YUN Xueyan(College of Food Science and Engineering,Inner Mongolia Agricultural University,Hohhot 010018,China)

机构地区：[1]内蒙古农业大学食品科学与工程学院,呼和浩特010018

出　　处：《包装工程》2024年第15期123-133,共11页Packaging Engineering

基　　金：食品科学与工程学院第九届大学生科技创新与创业基金项目(2023)。

摘　　要：目的提高聚(L-乳酸)(PLLA)薄膜的氧气(O_(2))、水蒸气(H_(2)O)阻隔性,解决延展性差等问题。方法采用熔融共混法分别将聚(对苯二甲酸己二酸丁二醇酯)(PBAT)、聚(L-乳酸-衣康酸丁二醇酯)(P(LA-BI))与PLLA共混制备薄膜。在此基础上,加入具有阻O_(2)、阻H_(2)O双功能的抗水解剂(Z)进行进一步改性。结果Z的添加(质量分数为6%)在保持PLLA/PBAT和PLLA/P(LA-BI)薄膜力学强度的基础上,将2种薄膜的断裂伸长率大幅提高至387%和316%,薄膜展现出优异的柔韧性;PLLA/P(LA-BI)/Z6膜的氧气透过率(OTR)和水蒸气透过率(WVTR)分别为6.4 cm^(3)/(m^(2)·d)和43.1 g/(m^(2)·d),较添加Z6前分别降低了54.6%和61.9%,薄膜获得了优异的O_(2)、H_(2)O阻隔性能。在酸奶的贮藏过程中,PLLA/PBAT/Z6组和PLLA/P(LA-BI)/Z6组酸奶的可滴定酸度在第21天时仍保持在合理范围内,达到了延缓酸奶贮藏过程中后酸化的效果。在后续的感官评定中相较于PLLA/PBAT组和PLLA/P(LA-BI)组,添加Z6组包装的酸奶获得了更高的评分。结论将具有阻O_(2)、阻H_(2)O双功能的Z6抗水解剂添加到PLLA基薄膜中改善了薄膜的延展性,提高了O_(2)、H_(2)O阻隔性能,同时在酸奶贮藏过程中起到良好的保质保鲜效果。因此,PLLA/PBAT/Z6和PLLA/P(LA-BI)/Z6薄膜可以代替市面上不可降解的酸奶包装材料进行推广使用。The work aims to improve the oxygen(O_(2))and water(H_(2)O)barrier properties of poly(L-lactic acid)(PLLA)films and to solve the problems of poor ductility.The melt blending method was used to prepare films by blending poly(butylene adipate terephthalate)(PBAT)and poly(L-lactic acid-itaconic acid butylene diol ester)(P(LA-BI))with PLLA,respectively.On this basis,an anti-hydrolyzing agent(Z)with dual function of O_(2)and H_(2)O barrier property was added for further modification.The addition of Z(6 wt%)significantly increased the elongation at break of PLLA/PBAT and PLLA/P(LA-BI)films to 387%and 316%,while maintaining the mechanical strength of the films,and the films exhibited excellent softness and toughness;The oxygen transmission rate(OTR)and water vapor transmission rate(WVTR)of PLLA/P(LA-BI)/Z6 films were 6.4 cm^(3)/(m^(2)·d)and 43.1 g/(m^(2)·d),respectively,which were 54.6%and 61.9%lower than those before the addition of Z6,and the films obtained excellent O_(2)and H_(2)O barrier properties.The titratable acidity of yogurt in the PLLA/PBAT/Z6 and PLLA/P(LA-BI)/Z6 groups remained within a reasonable range at the 21st day,which achieved the effect of delaying post-acidification during yogurt storage.In the subsequent sensory evaluation,the yogurt with the addition of Z6 packaging received higher scores compared with the PLLA/PBAT and PLLA/P(LA-BI)groups.The addition of Z6 anti-hydrolyzing agent,which has the dual functions of O_(2)and H_(2)O barrier properties,to PLLA-based films improves the ductility of the films,enhances the O_(2)and H_(2)O barrier properties,and at the same time plays a good quality and preservation effect in the yogurt storage process.Thus,PLLA/PBAT/Z6 and PLLA/P(LA-BI)/Z6 films can be promoted for use in place of commercially available non-biodegradable yogurt packaging materials.

关 键 词：生物可降解材料 聚乳酸 阻隔性 柔韧性 酸奶包装 

分 类 号：TB484.3[一般工业技术—包装工程]