当前位置: X-MOL 学术Food Biophys. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Preparation and Characterization of Pullulan/Carboxymethyl Cellulose/Nano-TiO2 Composite Films for Strawberry Preservation
Food Biophysics ( IF 3 ) Pub Date : 2021-08-02 , DOI: 10.1007/s11483-021-09684-w
Xiuling Zhang 1 , Zhen Li 1 , Run Ji 1 , Kun Li 1 , Wentao Zhang 1
Affiliation  

Biodegradable composite films based on pullulan/carboxymethyl cellulose/nano-TiO2 were prepared using a solution casting method. In this study, the composite films were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM), and their physical, mechanical and antimicrobial properties were investigated. FTIR and XRD results confirmed that the presence of nano-TiO2 could enhance the interaction between the film matrix. SEM analysis revealed that the composite films had a homogeneous network structure, and good particle dispersion could be obtained when the nano-TiO2 particle content was low. DSC results indicated that the composite films possessed good thermal stability. The incorporation of nano-TiO2 increased the thickness and contact angle while significantly decreasing the water solubility (p < 0.05). As the content of nano-TiO2 increased, the water vapor and ultraviolet visible (UV–Vis) light barrier properties of composite films were significantly improved (p < 0.05). Mechanical analysis demonstrated that the tensile strength of the composite films first increased and then decreased, whereas the elongation at break decreased significantly (p < 0.05). In addition, the composite films exhibited excellent activity against Escherichia coli and Staphylococcus aureus mainly due to the inactivation of bacteria by nano-TiO2 photocatalysis. Preservation experiments showed that the composite films could decrease the weight loss significantly and maintain the firmness, titratable acidity, vitamin c and skin color of strawberries, thereby improving the overall quality of strawberries and extending their shelf life. This finding suggested that pullulan/carboxymethyl cellulose/nano-TiO2 composite films possessed excellent potential for application in food packaging.



中文翻译:

草莓保鲜用普鲁兰多糖/羧甲基纤维素/纳米二氧化钛复合膜的制备及表征

采用溶液浇铸法制备了基于支链淀粉/羧甲基纤维素/纳米TiO 2 的可生物降解复合膜。本研究通过傅里叶变换红外光谱 (FTIR)、X 射线衍射 (XRD)、差示扫描量热法 (DSC) 和扫描电子显微镜 (SEM) 对复合薄膜进行了表征,并对其物理、机械和抗菌性能进行了表征。调查。FTIR和XRD结果证实纳米TiO 2的存在可以增强薄膜基体之间的相互作用。SEM 分析表明,复合薄膜具有均匀的网络结构,当纳米 TiO 2颗粒含量低。DSC结果表明复合薄膜具有良好的热稳定性。纳米TiO 2 的加入增加了厚度和接触角,同时显着降低了水溶性(p  < 0.05)。随着纳米TiO 2含量的增加,复合薄膜的水蒸气和紫外可见光(UV-Vis)阻光性能显着提高(p  < 0.05)。力学分析表明,复合膜的拉伸强度先增加后降低,而断裂伸长率显着降低(p  < 0.05)。此外,复合膜对大肠杆菌表现出优异的活性金黄色葡萄球菌主要是由于细菌的通过纳米的TiO灭活2个光催化。保鲜实验表明,复合薄膜可显着减少草莓的失重,保持草莓的硬度、可滴定酸度、维生素c和表皮颜色,从而提高草莓的整体品质,延长草莓的保质期。这一发现表明普鲁兰多糖/羧甲基纤维素/纳米TiO 2复合薄膜在食品包装中具有良好的应用潜力。

更新日期:2021-08-02
down
wechat
bug