壳聚糖基薄膜与辣木叶和 MgO 纳米粒子共混，用于活性食品包装。
Chitosan-based films blended with moringa leaves and MgO nanoparticles for application in active food packaging.
机构信息
Radiology and Medical Imaging Department, College of Applied Medical Sciences, Prince Sattam Bin Abdul-Aziz University, Al-Kharj 11942, Saudi Arabia; Biophysics Department, Faculty of Science, Cairo University, Cairo, Egypt.
Biotechnology/Biomolecular Chemistry Program, Faculty of Science, Cairo University, Cairo, Egypt.
出版信息
Int J Biol Macromol. 2023 Dec 31;253(Pt 6):127045. doi: 10.1016/j.ijbiomac.2023.127045. Epub 2023 Sep 28.
This study aims to address the issue of environmental pollution caused by non-biodegradable petroleum-based food packaging by exploring the application of biodegradable films. Film casting was employed to fabricate food packaging films from chitosan (CS) and polyvinyl alcohol (PVA) polymers blended with moringa extract (MoE) and various concentrations of magnesium oxide nanoparticles (MgO NPs). The films were characterized through multiple techniques, including UV spectroscopy, Thermogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), Scanning Electron Microscopy (SEM), Energy-Dispersive X-ray Spectroscopy (EDX), X-ray Diffraction (XRD), and Fourier-transform Infrared Spectroscopy (FTIR). The study investigated the physicomechanical properties, water solubility, water vapor transmission rate, oxygen permeability, migration test, biodegradability, contact angle, anti-fogging, antibacterial and antifungal activity, and application of the films for food packaging. The results showed that blending CS/PVA films with MoE and MgO NPs significantly improved their mechanical properties. The highest tensile strength of 98 MPa was observed in the CPMMgO-0.5 film. The solubility of the films was low, with CPMMgO-0 and CPMMgO-0.25 demonstrating the lowest solubility as weight decreased by 3.41 % and 3.47 %, respectively. The water vapor transmission rate and oxygen permeability decreased with increasing MgO NP concentrations, with the CPMMgO-0.5 film exhibiting the lowest values. The films also demonstrated good biodegradability, anti-fogging ability, antibacterial and antifungal activity, and low water solubility, enabling bead encapsulation over 14 days in good condition. Moreover, the thermal stability of the films was improved, extending the shelf life of bread. Therefore, the fabricated films provide a promising alternative to non-degradable plastic packaging, which heavily contributes to environmental pollution.
本研究旨在解决由不可生物降解的石油基食品包装造成的环境污染问题，探索可生物降解薄膜的应用。采用涂膜法制备壳聚糖（CS）和聚乙烯醇（PVA）聚合物薄膜，共混有辣木叶提取物（MoE）和不同浓度的氧化镁纳米粒子（MgO NPs）。采用紫外分光光度法、热重分析（TGA）、差示扫描量热法（DSC）、扫描电子显微镜（SEM）、能谱（EDX）、X 射线衍射（XRD）和傅里叶变换红外光谱（FTIR）对薄膜进行了表征。研究了薄膜的物理力学性能、水溶性、水蒸气透过率、氧气透过率、迁移试验、生物降解性、接触角、防雾性、抗菌和抗真菌活性以及薄膜在食品包装中的应用。结果表明，共混 CS/PVA 薄膜与 MoE 和 MgO NPs 显著提高了其力学性能。CPMMgO-0.5 薄膜的拉伸强度最高，为 98 MPa。薄膜的水溶性较低，CPMMgO-0 和 CPMMgO-0.25 的水溶性最低，重量分别减少了 3.41%和 3.47%。水蒸气透过率和氧气透过率随 MgO NP 浓度的增加而降低，CPMMgO-0.5 薄膜的数值最低。薄膜还表现出良好的生物降解性、防雾性、抗菌和抗真菌活性以及较低的水溶性，可在 14 天内良好条件下进行珠状封装。此外，薄膜的热稳定性得到提高，延长了面包的货架期。因此，所制备的薄膜为不可降解塑料包装提供了一种有前途的替代品，可大大减少环境污染。
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