Volatile Compounds and Off-odors Analysis of Recycled PLA for Packaging Applications: An Essential Factor for Ensuring Food Safety and Quality

IF 4.7 3区工程技术 Q2 ENGINEERING, ENVIRONMENTAL

Journal of Polymers and the Environment Pub Date : 2024-09-25 DOI:10.1007/s10924-024-03409-z

Robert Paiva, Magdalena Wrona, Cristina Nerín, Georgiana-Luminita Gavril, Sandra Andrea Cruz

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引用次数: 0

Abstract

Recent European guidelines support the use of recycled and biodegradable packaging for food applications. The approval of such packaging must not alter food’s taste or be harmful to health. In this work, PLA pellets were subjected to a post-consumer contamination procedure, washing process, and mechanical recycling, under common conditions of the recycling industry. HS-SPME-GC-MS and HS-SPME-GC-O-MS methods were used to detect volatile compounds and off-odor profiles. 33 different volatile compounds were identified in all samples. Intentionally added and non-intentionally added substances (IAS and NIAS) were identified, including benzaldehyde, benzyl alcohol, and dimethyl-1,4-dioxane-2,5-dione. The relationship between the formation of different NIAS and the PLA recycling process steps was determined. 14 different odor compounds such as benzyl alcohol, benzaldehyde, nonanal, decanal, dodecanal, 2,3-dimethylnaphthalene and 2,4-di-tert-butylphenol were detected and classified into 4 aroma groups (Toasted, Flower, Green and Chemical). The results obtained are essential for the food safety of recycled plastic material for food contact.

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包装应用中回收聚乳酸的挥发性化合物和异味分析：确保食品安全和质量的关键因素

最近的欧洲指导方针支持在食品应用中使用可回收和可生物降解的包装。此类包装的批准不得改变食品的口味或对健康有害。在这项工作中，聚乳酸颗粒经过了消费后污染程序、洗涤过程，并在回收行业的常见条件下进行了机械回收。采用 HS-SPME-GC-MS 和 HS-SPME-GC-O-MS 方法检测挥发性化合物和异味。在所有样品中鉴定出 33 种不同的挥发性化合物。确定了有意添加和非有意添加物质（IAS 和 NIAS），包括苯甲醛、苯甲醇和二甲基-1,4-二氧六环-2,5-二酮。确定了不同 NIAS 的形成与聚乳酸回收工艺步骤之间的关系。检测了 14 种不同的气味化合物，如苯甲醇、苯甲醛、壬醛、癸醛、十二醛、2,3-二甲基萘和 2,4-二叔丁基苯酚，并将其分为 4 个芳香组（烤香、花香、绿色和化学香）。所得结果对用于食品接触的再生塑料材料的食品安全至关重要。

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来源期刊

Journal of Polymers and the Environment 工程技术-高分子科学

CiteScore

9.50

自引率

7.50%

发文量

297

审稿时长

9 months

期刊介绍： The Journal of Polymers and the Environment fills the need for an international forum in this diverse and rapidly expanding field. The journal serves a crucial role for the publication of information from a wide range of disciplines and is a central outlet for the publication of high-quality peer-reviewed original papers, review articles and short communications. The journal is intentionally interdisciplinary in regard to contributions and covers the following subjects - polymers, environmentally degradable polymers, and degradation pathways: biological, photochemical, oxidative and hydrolytic; new environmental materials: derived by chemical and biosynthetic routes; environmental blends and composites; developments in processing and reactive processing of environmental polymers; characterization of environmental materials: mechanical, physical, thermal, rheological, morphological, and others; recyclable polymers and plastics recycling environmental testing: in-laboratory simulations, outdoor exposures, and standardization of methodologies; environmental fate: end products and intermediates of biodegradation; microbiology and enzymology of polymer biodegradation; solid-waste management and public legislation specific to environmental polymers; and other related topics.