Department of Phytochemistry & Chemical Engineering, Medicinal Plants and Drugs Research Institute, Shahid Beheshti University, Tehran, Iran.
Department of Biology, Medicinal Plants and Drugs Research Institute, Shahid Beheshti University, Tehran, Iran.
Carbohydr Polym. 2017 Nov 1;175:241-248. doi: 10.1016/j.carbpol.2017.07.086. Epub 2017 Jul 31.
Edible films containing essential oils (EO) as natural antibacterial agents are promising systems for food preservation. In this work, nanoemulsions of Thymus daenensis EO (wild; F1 and cultivated; F2) were loaded in hydroxyl propyl methyl cellulose (HPMC) films and the effect of different parameters (polymer, plasticizer, and EO concentration) on the film properties were analyzed and optimized. Prepared HPMC films were characterized in terms of EO loading, morphology, mechanical properties, and the antibacterial activity. The results of SEM showed uniform incorporation of nanoemulsions into the edible film. Investigation of the mechanical properties of two edible films revealed a plasticizing effect of T. daenensis EO on the films. Also, edible films had noticeable antimicrobial activity against selected microorganisms, i.e. 47.0±2.5mm and 22.6±0.5mm zone of inhibition against S. aureus for films containing F1 and F2, respectively. Incorporation of nanoemulsions into the HPMC films can be used for active food preservation.
含有精油 (EO) 的可食用薄膜作为天然抗菌剂是一种有前景的食品保鲜系统。在这项工作中，将野生百里香精油（F1）和栽培百里香精油（F2）的纳米乳液负载在羟丙基甲基纤维素（HPMC）薄膜中，并分析和优化了不同参数（聚合物、增塑剂和 EO 浓度）对薄膜性能的影响。制备的 HPMC 薄膜在精油负载量、形态、力学性能和抗菌活性方面进行了表征。SEM 的结果表明纳米乳液均匀地掺入到可食用薄膜中。对两种可食用薄膜力学性能的研究表明，百里香精油对薄膜具有增塑作用。此外，可食用薄膜对选定的微生物具有显著的抗菌活性，分别含有 F1 和 F2 的薄膜对金黄色葡萄球菌的抑菌圈直径为 47.0±2.5mm 和 22.6±0.5mm。纳米乳液的加入可以提高 HPMC 薄膜的活性，用于食品的保鲜。
