Lin Junjie, Pan Daodong, Sun Yangying, Ou Changrong, Wang Ying, Cao Jinxuan
Key Laboratory of Animal Protein Food Processing Technology of Zhejiang Province Ningbo University Ningbo China.
Food Sci Nutr. 2019 Nov 19;7(12):4140-4146. doi: 10.1002/fsn3.1282. eCollection 2019 Dec.
In order to investigate the effect of glutaraldehyde (GTA) on the structure, mechanical properties and thermal stability of gelatin films, gelatin films modified by GTA at various pH (4.5, 6.5, and 11), were prepared. According to FTIR analysis, the reaction mechanism between GTA and gelatin was different at various pH. With the addition of GTA, the intermolecular forces (hydrogen bonds and ionic bonds) and triple helix structure of gelatin film were significantly disrupted. At pH 4.5, gelatin films modified by GTA showed the highest mechanical properties and thermal stability among all films, which tensile strength and residues in TGA up to 16.13 MPa and 15.05%, respectively. Therefore, an optimum pH was around 4.5 in gelatin films cross-linked by GTA.
为了研究戊二醛（GTA）对明胶膜结构、力学性能和热稳定性的影响，制备了在不同pH值（4.5、6.5和11）下用GTA改性的明胶膜。根据傅里叶变换红外光谱（FTIR）分析，GTA与明胶之间的反应机理在不同pH值下有所不同。随着GTA的加入，明胶膜的分子间作用力（氢键和离子键）和三螺旋结构被显著破坏。在pH 4.5时，用GTA改性的明胶膜在所有膜中表现出最高的力学性能和热稳定性，其拉伸强度和热重分析（TGA）中的残留量分别高达16.13 MPa和15.05%。因此，在GTA交联的明胶膜中，最佳pH值约为4.5。
