Chen Yong, Zhang Haifeng, Wei Guosheng, Liu Fengsong, Zhang Yue, Chen Ying
College of Agriculture and Biology, Guangxi MinZu Normal University, Chongzuo 532200, China.
Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, School of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China.
Food Chem. 2025 May 1;473:143027. doi: 10.1016/j.foodchem.2025.143027. Epub 2025 Jan 22.
The broad application of starch films has been significantly limited by their insufficient hydrophobicity and antibacterial activity. To overcome these challenges, this study developed a new starch film by incorporating polyvinyl alcohol (PVA) and chlorogenic acid. The study explored the impact of PVA polymerization on the physical and functional characteristics of the resulting films, with particular emphasis on enhancing antimicrobial functionality by incorporating chlorogenic acid. Scanning electron microscopy (SEM) and rheological tests demonstrated the excellent compatibility and exceptional film-forming performance. Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) analyses validated the presence of intermolecular entanglements and hydrogen bonding within the films. Incorporating PVA with a polymerization degree of 2400 resulted in a contact angle (CA) of 79.81 ± 1.74°, a water absorption capacity (WAC) of 10.29 ± 0.71 %, and a water vapor permeability (WVP) of (0.44 ± 0.11) × 10 g × m × s × Pa. Notably, the SCP 2488 film exhibited superior mechanical properties, including the highest Young's modulus of 71.29 MPa, tensile strength of 11.77 MPa, and elongation at break of 106.75 %. Additionally, such a modified film displayed enhanced UV-blocking performance and antibacterial efficacy. Consequently, the SCP 2488 film showed great potential for maintaining the freshness and quality of strawberries.
淀粉薄膜的广泛应用因其疏水性和抗菌活性不足而受到显著限制。为了克服这些挑战，本研究通过加入聚乙烯醇（PVA）和绿原酸开发了一种新型淀粉薄膜。该研究探讨了PVA聚合对所得薄膜物理和功能特性的影响，特别强调通过加入绿原酸来增强抗菌功能。扫描电子显微镜（SEM）和流变学测试证明了其优异的相容性和出色的成膜性能。傅里叶变换红外光谱（FTIR）和X射线衍射（XRD）分析证实了薄膜中存在分子间缠结和氢键。加入聚合度为2400的PVA后，接触角（CA）为79.81±1.74°，吸水率（WAC）为10.29±0.71%，水蒸气透过率（WVP）为（0.44±0.11）×10 g×m×s×Pa。值得注意的是，SCP 2488薄膜表现出优异的机械性能，包括最高的杨氏模量71.29 MPa、拉伸强度11.77 MPa和断裂伸长率106.75%。此外，这种改性薄膜还表现出增强的紫外线阻隔性能和抗菌效果。因此，SCP 2488薄膜在保持草莓新鲜度和品质方面具有巨大潜力。
