Glyn O. Phillips Hydrocolloid Research Centre at HBUT, National "111" Center for Cellular Regulation and Molecular Pharmaceutics, School of Food and Biological Engineering, Hubei University of Technology, Wuhan 430068, China.
Group for Cereals and Oils Processing, College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China.
Carbohydr Polym. 2022 Feb 1;277:118879. doi: 10.1016/j.carbpol.2021.118879. Epub 2021 Nov 10.
The practical features (e.g., sol-gel, mechanical and hydrophobic) of biopolymer systems are crucial for their materials applications. This work reveals how polyvinyl alcohol (PVA) inclusion affects the practical features of agar/konjac glucomannan (KGM) system. From rheological analysis, incorporating PVA (especially 6%) enhanced the chain entanglements of resulted ternary solution (AKP) with stabilized sol-gel transition point. Such effect not only increased the zero-shear viscosity (ca. 1.5 times that of agar/KGM counterpart) and structural recovery degree of AKP solution, but also caused reduced crystallites and simultaneously increased tensile strength, elongation at break and hydrophobicity for AKP film from solution dehydration. This ternary film exhibited a tensile strength of ca. 105 MPa, an elongation at break of ca. 20%, and a water contact angle of ca. 97.6°. Additionally, incorporating PVA almost unaffected the morphology of film fracture surface. These results are valuable for the design of agar/KGM systems with improved practical features.
生物聚合物系统的实际特性（例如溶胶-凝胶、机械和疏水性）对于它们的材料应用至关重要。这项工作揭示了聚乙烯醇（PVA）的包含如何影响琼脂/魔芋葡甘聚糖（KGM）系统的实际特性。从流变分析来看，加入 PVA（特别是 6%）增强了三元溶液（AKP）的链缠结，使其具有稳定的溶胶-凝胶转变点。这种效应不仅增加了零剪切粘度（约为琼脂/KGM 对应物的 1.5 倍）和 AKP 溶液的结构恢复程度，而且还导致 AKP 薄膜的结晶度降低，同时拉伸强度、断裂伸长率和疏水性增加溶液脱水。这种三元薄膜的拉伸强度约为 105 MPa，断裂伸长率约为 20%，水接触角约为 97.6°。此外，加入 PVA 几乎不会影响薄膜断裂表面的形态。这些结果对于设计具有改进实际特性的琼脂/KGM 系统具有重要价值。
