壳聚糖基膜中掺入超临界 CO2 萃取物：结构、物理化学和抗菌性能。
Chitosan-based films with incorporated supercritical CO hop extract: Structural, physicochemical, and antibacterial properties.
机构信息
Department of Catalysis and Chemical Reaction Engineering, National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia.
Acies Bio d.o.o., Tehnološki park 21, 1000 Ljubljana, Slovenia.
出版信息
Carbohydr Polym. 2019 Sep 1;219:261-268. doi: 10.1016/j.carbpol.2019.05.003. Epub 2019 May 7.
Chitosan-based films with incorporated supercritical CO hop extract (HE) were developed and evaluated regarding structural, physicochemical, and antibacterial properties. The morphological and spectroscopic analyses have confirmed successful incorporation of HE into the polymer matrix, which affected films' structure and visual appearance. The presence of HE has caused a reduction in the hydrophilic character of films, but also provided a complete UV light blockage at wavelengths below 350 nm. Furthermore, a declining trend of tensile strength (from 14.4 MPa to 6.4 MPa) and Young's modulus (from 218.8 MPa to 26.9 MPa), as well as an ascending trend of elongation at break (from 10.7% to 35.1%), have been observed after the extract incorporation. The total phenolic content in the films was up to ∼13 mg g. Besides, the HE-loaded films exhibited antibacterial activity against foodborne pathogen Bacillus subtilis.
以壳聚糖为基质的薄膜中加入超临界 CO2 萃取物（HE），并对其结构、物理化学和抗菌性能进行了评估。形态学和光谱分析证实了 HE 成功地掺入聚合物基质中，这影响了薄膜的结构和外观。HE 的存在降低了薄膜的亲水性，但也在波长低于 350nm 时完全阻挡了紫外线。此外，在加入提取物后，拉伸强度（从 14.4MPa 降至 6.4MPa）和杨氏模量（从 218.8MPa 降至 26.9MPa）呈下降趋势，而断裂伸长率（从 10.7%增至 35.1%）呈上升趋势。薄膜中的总酚含量高达约 13mg/g。此外，载有 HE 的薄膜对食源性病原体枯草芽孢杆菌具有抗菌活性。
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