Bioderived Poly(lactic acid) Composite with Chitosan: Physical Properties and Antimicrobial Effect in Combination with Mild Heat and UV-A Light

IF 2.6 Q2 FOOD SCIENCE & TECHNOLOGY

ACS food science & technology Pub Date : 2025-05-07 DOI:10.1021/acsfoodscitech.5c0015010.1021/acsfoodscitech.5c00150

Michael J. Bodily, José H. Ramírez-Suárez, David W. Britt, Julie M. Goddard and Luis J. Bastarrachea*,

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Abstract

An antimicrobial and biodegradable composite was prepared by melt-blending poly(lactic acid), polyhydroxybutyric acid, and chitosan and then challenged against Escherichia coli K12 and Listeria innocua in apple juice in combination with either UV-A light irradiation or mild heat (50 °C). The composite (PLA-CHI) combined with UV-A light irradiation reduced the populations of E. coli K12 and L. innocua by 99.8% and >99.998%, respectively. PLA-CHI combined with mild heat (50 °C) reduced the populations of E. coli K12 and L. innocua by 99.9% and >99.998%, respectively. Surface analysis confirmed the overall chemical stability of PLA-CHI. Compared to poly(lactic acid), values of the thermal properties decreased, water vapor permeability was unchanged, oxygen permeability increased, and mechanical properties remained stable. These results suggest that integrating biodegradable and antimicrobial materials with UV-A irradiation or mild heat represents an effective hurdle technology for food preservation.

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生物源性聚乳酸-壳聚糖复合材料的物理性能及微热和UV-A光复合的抗菌效果

采用聚乳酸、聚羟基丁酸和壳聚糖熔融共混制备了一种抗菌、可生物降解的复合材料，并在UV-A光照射或50℃温热条件下对苹果汁中的大肠杆菌K12和李斯特菌进行攻毒。复合材料（PLA-CHI）与UV-A光照射复合后，大肠杆菌K12和innocua的数量分别减少99.8%和99.998%。PLA-CHI结合50°C的温和高温，大肠杆菌K12和innocua的数量分别减少了99.9%和99.998%。表面分析证实了PLA-CHI的整体化学稳定性。与聚乳酸相比，其热性能降低，水蒸气渗透性不变，氧渗透性增加，力学性能保持稳定。这些结果表明，将生物可降解和抗菌材料与UV-A照射或温热结合是一种有效的食品保鲜屏障技术。

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来源期刊

ACS food science & technology

CiteScore

3.30

自引率

0.00%

发文量