Agricultural and Biosystems Engineering Department, Faculty of Agriculture, Benha University, P.O. Box 13736, Moshtohor, Toukh, Kalubia, Egypt.
Basic and Applied Science Department, College of Engineering and Technology, Arab Academy for Science and Technology and Maritime Transport (AASTMT), P.O. Box 2033, Cairo, Egypt.
Sci Rep. 2023 Mar 28;13(1):5063. doi: 10.1038/s41598-023-32218-y.
The bio-composite films based on Hydroxypropyl methylcellulose (HPMC) reinforced with silver nanoparticles (AgNPs) and Titanium oxide nanoparticles (TiO-NPs) were developed. Some physical and mechanical properties: Tensile strength (TS), elongation (E), Young's elastic modulus (EM), water vapor permeability (WVP) and transparency were determined. Antibacterial properties of these films were also studied. The tensile strength values of HPMC film reinforced with Ag NPs and TiO-NPs and HPMC without nanoparticles were 39.24, 143.87 and 157.92 MPa, respectively. Elongation of the HMPC film was less than the HPMC film reinforced with AgNPs and TiO-NPs, the results were 2, 35 and 42%, respectively. Additionally, Young's elastic modulus of HMPC film was determined to be 19.62 MPa and the HPMC film reinforced with AgNPs and TiO-NPs were 4.11 and 3.76 MPa, respectively. The values of WVP of HMPC film was higher than the HMPC film reinforced with AgNPs and TiO-NPs, where they were 0.5076 × 10, 0.4596 × 10 and 0.4504 × 10 (g/msPa), respectively. Nano-composite films demonstrated strong antibacterial activity against tested pathogen bacteria in the contact surface zone. The antibacterial activites of AgNPs (~ 10 nm) at 80 ppm were more active than 20 and 40 ppm against foodborne pathogen i.e. Bacillus cereus and Escherichia coli, the inhibition zone diameters were 9 and 10 mm, respectively. As well, TiO-NPs (~ 50 nm) at 80 ppm were more active than 20 and 40 ppm against B. cereus and Salmonella Typhimurium, the inhibition zone diameters were11 and 10 mm, respectively.
基于羟丙基甲基纤维素（HPMC）的生物复合薄膜，通过添加银纳米粒子（AgNPs）和氧化钛纳米粒子（TiO-NPs）进行增强。对一些物理和机械性能进行了测定，包括拉伸强度（TS）、伸长率（E）、杨氏弹性模量（EM）、水蒸气透过率（WVP）和透明度。同时还研究了这些薄膜的抗菌性能。HPMC 薄膜中添加 Ag NPs 和 TiO-NPs 以及未添加纳米粒子的 HPMC 的拉伸强度值分别为 39.24、143.87 和 157.92 MPa。HPMC 薄膜的伸长率小于添加 AgNPs 和 TiO-NPs 的 HPMC 薄膜，分别为 2%、35%和 42%。此外，HMPC 薄膜的杨氏弹性模量为 19.62 MPa，而添加 AgNPs 和 TiO-NPs 的 HMPC 薄膜的杨氏弹性模量分别为 4.11 和 3.76 MPa。HMPC 薄膜的 WVP 值高于添加 AgNPs 和 TiO-NPs 的 HMPC 薄膜，分别为 0.5076×10、0.4596×10 和 0.4504×10（g/msPa）。纳米复合材料薄膜在接触表面区域对测试的病原菌表现出很强的抗菌活性。80 ppm 的 AgNPs（10nm）的抗菌活性比 20 和 40 ppm 对食源性病原体如蜡样芽孢杆菌和大肠杆菌更为活跃，抑菌圈直径分别为 9 和 10mm。同样，80 ppm 的 TiO-NPs（50nm）比 20 和 40 ppm 对蜡样芽孢杆菌和鼠伤寒沙门氏菌更为活跃，抑菌圈直径分别为 11 和 10mm。
