聚乳酸生物降解复合膜向食品模拟物的总迁移及钙的迁移研究  

Overall Migration and Calcium Migration from Biodegraded Polylactic Acid Composite Films into Food Simulant

作　　者：何金凤 林勤保[1] 任纪州 吕新广 李忠 HE Jin-feng;LIN Qin-bao;REN Ji-zhou;Lü Xin-guang;LI Zhong(Key Laboratory of Product Packaging and Logistics of Guangdong Higher Education Institutes,Packaging Engineering Institute,Jinan University,Zhuhai 519070,China;School of Mechanical Engineer,Wuhan Polytechnic University,Wuhan 430023,China;Gongbei Customs Technology Center,Zhuhai 519000,China)

机构地区：[1]暨南大学包装工程研究所,广东普通高校产品包装与物流重点实验室,广东珠海519070 [2]武汉轻工大学机械工程学院,湖北武汉430023 [3]拱北海关技术中心,广东珠海519000

出　　处：《分析测试学报》2021年第11期1639-1644,共6页Journal of Instrumental Analysis

基　　金：国家重点研发计划(2018YFC1603204)。

摘　　要：研究了5种不同碳酸钙含量的PLA/PBAT/CaCO_(3)复合膜中的钙在40℃和70℃下向3%乙酸食品模拟物的迁移及向3种食品模拟物(3%乙酸、10%乙醇、95%乙醇)的总迁移,探究了复合膜中碳酸钙含量与总迁移的关系,并研究了紫外老化处理对迁移的影响。结果表明,5种复合膜向3%乙酸中的总迁移量均超过总迁移限值(OML),且总迁移主要受复合膜中碳酸钙含量的影响,钙浓度与总迁移量呈线性关系。同时,随着复合膜中碳酸钙含量的增加,钙的迁移量增加,且不同碳酸钙含量的复合膜均在短时间内达到迁移平衡(40℃,4 h)。将复合膜紫外老化处理较长时间(24 h以上)会导致钙的迁移量减少,可能的原因是紫外照射引起聚己二酸/对苯二甲酸丁二酯(PBAT)的交联反应,从而抑制了钙的迁移。此类生物降解复合膜作为食品接触材料的安全性值得进一步关注和研究。While biodegradable plastics continually exhibit many excellent properties,their safety has been increasingly concerned.In this study,the migration risk of calcium in food contact degradation composite film was evaluated,with polylactic acid(PLA)and polylactic acid/poly(butyleneadipate-co-terephthalate)(PBAT)as the substrates and calcium carbonate(CaCO_(3))as the inorganic filler.The calcium concentrations in five kinds of PLA/PBAT/CaCO_(3) composite films with various contents of CaCO_(3) were determined by inductively coupled plasma optical emission spectrometry(ICP-OES).Meanwhile,the PLA/PBAT/CaCO_(3) films were characterized by scanning electron microscopy(SEM).The overall migration of PLA/PBAT/CaCO_(3) films into three food simulants(3%acetic acid,10%ethanol,95%ethanol)were investigated,and the relationship between the overall migration results and the calcium content was explored.Migrations of calcium from PLA/PBAT/CaCO_(3) films into the acidic food stimulant of 3%acetic acid at 40℃/24 h and 70℃/2 h were investigated,respectively.Furthermore,effect of ultraviolet aging treatment on the migration was also studied.Results showed that the overall migration of the five composite films into 95%ethanol was higher than that into 10%ethanol,and the overall migration into 3%acetic acid exceeded the overall migration limit(OML),which may lead to food safety risks.The overall migration was mainly affected by CaCO_(3),and the calcium concentration had a linear relationship with the overall migration into 3%acetic acid.With the increase of CaCO_(3) content,different degrees of agglomeration occurred on the surface of the films,while the migration of calcium was affected by the agglomeration.For all the composite films with different CaCO_(3) contents,the migration equilibriums were obtained in a short time(40℃,4 h).The long time(more than 24 h)UV aging for composite film inhibited the calcium migration due to the cross-linking of PBAT.The safety of these biodegradable composite films as food contact materials is

关 键 词：食品接触材料 生物降解薄膜 聚乳酸 碳酸钙 迁移 紫外老化 

分 类 号：O657.32[理学—分析化学] TQ623.4[理学—化学]