Sorption of flavour compounds by polyethylene terephthalate and copolyester films for food packaging

IF 2.8 4区工程技术 Q2 ENGINEERING, MANUFACTURING

Packaging Technology and Science Pub Date : 2023-05-10 DOI:10.1002/pts.2738

H. Hosono, N. Hirakawa, N. Zhang, Yuuki Kinoshita

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Abstract

The sorption of flavour compounds by PET and 15 copolyesters (PET copolymerized with isophthalic acid, adipic acid, sebacic acid, tetramethylene glycol, diethylene glycol, triethylene glycol and neopentyl glycol in the range of 5 to 18 mol%) was studied. Biaxially oriented films of each resin were immersed in aqueous solutions containing 37 types of flavour compounds for 4 weeks at 37°C. The amount of flavour compounds sorbed by the films was highly dependent on the copolymer composition. Among the tested films, the copolyester film containing 11 mol% sebacic acid exhibited the highest sorption of the 37 compounds, which was approximately 40 times that of PET. The copolyester film containing 11 mol% isophthalic acid exhibited the lowest sorption, approximately half that of PET. The relationship between sorption and the characteristic values of the polyester films was studied. Sorption was negatively correlated with the solubility parameter and density of the amorphous area and strongly negatively correlated with the glass transition temperature. It was concluded that the dynamic free volume involved in diffusion dominates the sorption of flavour compounds by copolyesters. The log P value and molecular size of the compounds had a strong effect on the sorption of individual flavour compounds by the films in aqueous solutions.

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食品包装用聚对苯二甲酸乙二醇酯和共聚酯薄膜对风味化合物的吸附

研究了PET与15种共聚聚酯(PET与间苯二甲酸、己二酸、癸二酸、四亚甘醇、二甘醇、三甘醇和新戊二醇在5 ~ 18摩尔%范围内共聚)对风味化合物的吸附性能。每种树脂的双轴取向膜在含有37种风味化合物的水溶液中浸泡4周，温度为37℃。薄膜吸收的风味化合物的量高度依赖于共聚物的组成。结果表明，含11mol %癸二酸的共聚酯膜对37种化合物的吸附率最高，约为PET的40倍。含11mol %二苯二甲酸的共聚酯膜吸附量最低，约为PET的一半。研究了吸附性能与聚酯薄膜特征值的关系。吸附与溶解度参数和非晶区密度呈负相关，与玻璃化转变温度呈强负相关。结果表明，参与扩散的动态自由体积在共聚酯对风味化合物的吸附中起主导作用。化合物的logp值和分子大小对膜对单个风味化合物在水溶液中的吸附有很大影响。

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来源期刊

Packaging Technology and Science 工程技术-工程：制造

CiteScore

4.90

自引率

7.70%

发文量

审稿时长

>12 weeks

期刊介绍： Packaging Technology & Science publishes original research, applications and review papers describing significant, novel developments in its field. The Journal welcomes contributions in a wide range of areas in packaging technology and science, including: -Active packaging -Aseptic and sterile packaging -Barrier packaging -Design methodology -Environmental factors and sustainability -Ergonomics -Food packaging -Machinery and engineering for packaging -Marketing aspects of packaging -Materials -Migration -New manufacturing processes and techniques -Testing, analysis and quality control -Transport packaging