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通过将游离态α-生育酚和负载于聚乳酸纳米颗粒中的α-生育酚掺入制备活性低密度聚乙烯基薄膜的比较研究

Active Low-Density Polyethylene-Based Films by Incorporating α-Tocopherol in the Free State and Loaded in PLA Nanoparticles: A Comparative Study.

作者信息

Azevedo Ana G, Barros Carolina, Miranda Sónia, Machado Ana V, Carneiro Olga S, Silva Bruno, Andrade Mariana A, Vilarinho Fernanda, Saraiva Margarida, Sanches Silva Ana, Pastrana Lorenzo M, Cerqueira Miguel A

机构信息

International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal.

Institute for Polymers and Composites, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal.

出版信息

Foods. 2024 Feb 2;13(3):475. doi: 10.3390/foods13030475.

DOI:10.3390/foods13030475
PMID:38338609
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10855272/
Abstract

In this work, alpha-tocopherol (α-TOC) was encapsulated in poly(lactic acid) nanoparticles (PLA NPs) and added to low-density polyethylene (LDPE) films with the aim of producing an active film for food packaging applications. PLA NPs loaded with α-TOC were produced through nanoprecipitation and dried using two methods (freeze-dryer and oven). LDPE-based films with final polymeric matrix concentrations of 10 and 20 g/kg were then produced through blow extrusion. The results showed that LDPE-based films loaded with α-TOC can be produced using blow extrusion, and a good distribution of PLA NPs can be obtained within the LDPE matrix as observed using scanning electron microscopy (SEM). The mechanical properties were affected by the incorporation of α-TOC and PLA NPs loaded with α-TOC, with the observation of a decrease in tensile strength and Young's Modulus values and an increase in elongation at break. Regarding water vapor permeability, the films showed a reduction in the values with the addition of α-TOC and PLA NPs loaded with α-TOC compared to the LDPE film (control). Films with α-TOC in the free state and loaded in PLA NPs showed antioxidant activity, but their behavior was affected by the encapsulation process.

摘要

在本研究中，将α-生育酚（α-TOC）包裹于聚乳酸纳米颗粒（PLA NPs）中，并添加到低密度聚乙烯（LDPE）薄膜中，旨在制备用于食品包装的活性薄膜。通过纳米沉淀法制备了负载α-TOC的PLA NPs，并采用两种方法（冷冻干燥和烘箱干燥）进行干燥。然后通过吹塑挤出制备了最终聚合物基质浓度为10和20 g/kg的基于LDPE的薄膜。结果表明，采用吹塑挤出法可制备负载α-TOC的基于LDPE的薄膜，扫描电子显微镜（SEM）观察发现PLA NPs在LDPE基质中分布良好。α-TOC和负载α-TOC的PLA NPs的加入影响了薄膜的力学性能，观察到拉伸强度和杨氏模量值降低，断裂伸长率增加。关于水蒸气透过率，与LDPE薄膜（对照）相比，添加α-TOC和负载α-TOC的PLA NPs后，薄膜的水蒸气透过率值降低。处于游离状态和负载于PLA NPs中的α-TOC薄膜均表现出抗氧化活性，但其行为受包封过程的影响。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fadd/10855272/8e989cb38981/foods-13-00475-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fadd/10855272/8e50174dc4f7/foods-13-00475-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fadd/10855272/50380b5f2bd6/foods-13-00475-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fadd/10855272/efabc1dce9f1/foods-13-00475-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fadd/10855272/6544236ff28a/foods-13-00475-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fadd/10855272/9b9061ef686b/foods-13-00475-g005a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fadd/10855272/8e989cb38981/foods-13-00475-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fadd/10855272/8e50174dc4f7/foods-13-00475-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fadd/10855272/50380b5f2bd6/foods-13-00475-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fadd/10855272/efabc1dce9f1/foods-13-00475-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fadd/10855272/6544236ff28a/foods-13-00475-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fadd/10855272/9b9061ef686b/foods-13-00475-g005a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fadd/10855272/8e989cb38981/foods-13-00475-g006.jpg

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