Development of films based on blends of gelatin and poly(vinyl alcohol) cross linked with glutaraldehyde

明胶 乙烯醇 戊二醛 高分子 背景(考古学) 高分子化学 材料科学 交叉连接 相对湿度 化学工程 化学 有机化学 聚合物 生物化学 工程类 古生物学 热力学 物理 生物
作者
Priscila M.A. Alves,Rosemary Aparecida de Carvalho,Izabel Cristina Freitas Moraes,Carla Giovana Luciano,Ana Mônica Quinta Barbosa Bittante,Paulo José do Amaral Sobral
出处
期刊:Food Hydrocolloids [Elsevier BV]
卷期号:25 (7): 1751-1757 被引量:78
标识
DOI:10.1016/j.foodhyd.2011.03.018
摘要

Both gelatin and poly(vinyl alcohol) (PVA) can be cross linked with glutaraldehyde (GLU). In the case of gelatin, the GLU reacts with each ε-NH2 functional group of adjacent lysine residues, while for PVA, the GLU reacts with two adjacent hydroxyl groups, forming acetal bridges. Thus it can be considered possible to cross link adjacent macromolecules of gelatin and PVA using GLU. In this context, the aims of this work were the development of biodegradable films based on blends of gelatin and poly(vinyl alcohol) cross linked with GLU, and the characterization of some of their main physical and functional properties. All the films were produced from film-forming solutions (FFS) containing 2 g macromolecules (PVA + gelatin)/100 g FFS, 25 g glycerol/100 g macromolecules, and 4 g GLU (25% solution)/100 g FFS. The FFS were prepared with two concentrations of PVA (20 or 50 g PVA/100 g macromolecules) and two reaction temperatures: 90 or 55 °C, applied for 30 min. The films were obtained after drying (30 °C/24 h) and conditioning at 25 °C and 58% of relative humidity for 7 days, and were then characterized. The results for the color parameters, mechanical properties, phase transitions and infrared spectra showed that some chemical modifications occurred, principally for the gelatin. However, in general, all the characteristics of the films were either typical of films based on blends of these macromolecules without cross linking, or slightly higher. A greater improvement in the properties of this material was probably not observed due to the crystallinity of the PVA, which has a melting point above 90 °C. The presence of microcrystals in the polymer chain probably reduced macromolecular mobility, hindering the reaction. Thus more research is necessary to produce biodegradable films with improved properties.
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