Enhancing water repellence and mechanical properties of gelatin films by tannin addition
Enhancing water repellence and mechanical properties of gelatin films by tannin addition
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DOI：
10.1016/j.biortech.2010.03.112
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发表时间：
2010-09-01
影响因子：
11.4
通讯作者：
Mondragon, Inaki
中科院分区：
文献类型：
--
作者：
Pena, Cristina;de la Caba, Koro;Mondragon, Inaki
为了减少传统的不可生物降解塑料薄膜造成的污染，这项工作采用了来自植物和肉类工业废物的可再生原材料。可水解的栗树单宁用于明胶改性。通过在室温条件下浇铸获得明胶和明胶-单宁薄膜。明胶和明胶-单宁系统的转变温度均通过差示扫描量热法 (DSC) 测定。改性明胶的玻璃化转变温度比纯明胶的玻璃化转变温度更高。当单宁含量增加时，由于单宁存在导致明胶螺旋结构发生变化，螺旋-螺旋转变的焓和温度降低，这与 X 射线分析一致。机械和热性能随单宁含量的变化而变化，显示出用 10 wt% 单宁改性的薄膜的最佳值。单宁改性后薄膜的透明度得以保持。薄膜的溶解度和溶胀测试表明单宁的存在降低了明胶的水亲和力。 (C) 2010 Elsevier Ltd. 保留所有权利。
In order to reduce pollution caused by traditional non-biodegradable plastic films, renewable raw materials from plants and wastes of meat industries have been employed in this work. A hydrolysable chestnut-tree tannin was used for gelatin modification. Films of gelatin and gelatin-tannin were obtained by casting at room conditions. Transition temperatures of both gelatin and gelatin-tannin systems were determined by differential scanning calorimetry (DSC). Glass transition temperatures of modified gelatin occurred at higher temperatures than for neat gelatin. Enthalpy and temperature of helix-coil transition decreased when tannin content increased due to variations in the helical structure of gelatin as a consequence of tannin presence in agreement with X-ray analysis. Mechanical and thermal behaviour varied as a function of the content of tannin, showing optimum values for films modified with 10 wt% tannin. The transparency of films was maintained after modification with tannin. Solubility and swelling tests of the films revealed that the presence of tannin reduced the water affinity of gelatin. (C) 2010 Elsevier Ltd. All rights reserved.