基于静电相互作用的聚丙烯酸钠强化胶原纤维膜  

Collagen Membrane Strengthened by Sodium Polyacrylate Based on Electrostatic Interaction

作　　者：王亚斌 王稳航[1] WANG Yabin;WANG Wenhang(Engineering Research Center of Food Biotechnology,Ministry of Education,Tianjin University of Science and Technology,Tianjin 300457,China)

机构地区：[1]天津科技大学食品生物技术教育部工程研究中心,天津300457

出　　处：《食品科学》2018年第7期71-77,共7页Food Science

基　　金：国家高技术研究发展计划(863计划)项目(2013AA102204);食品生物技术教育部工程研究中心(天津科技大学)应用化项目(SPZX004)

摘　　要：为了提高胶原纤维膜的性能,基于聚丙烯酸钠的负电性与酸膨胀的胶原纤维的正电性,利用其静电相互作用原理,采用质量分数为0.1%~1.0%的聚丙烯酸钠强化胶原纤维膜,评价了其对膜性能的影响。结果发现:随着聚丙烯酸钠质量分数的增加,成膜液的Zeta电位有显著变化(P<0.05),表明其静电相互作用增强。加入聚丙烯酸钠后,复合膜的拉伸强度逐渐增大,最高达到纯膜的1.50倍;断裂延伸率、透光率和水蒸气透过率下降,其中,水蒸气透过率最低为1.30×10^(-12)g/(cm·s·Pa);膜热稳定性分析表明,复合膜降解温度提高,膜厚无明显变化,扫描电子显微镜显示聚丙烯酸钠-胶原纤维复合膜更致密。当聚丙烯酸钠的质量分数为0.3%时,复合膜的综合性能较佳,拉伸强度为37.60 MPa,断裂延伸率为14.20%,透光率为48.70%,水蒸气透过率为1.30×^(-12)/(cm·s·Pa)。此外,红外分析也显示复合膜的构象发生了变化。静电相互作用导致了聚丙烯酸钠与胶原蛋白的作用增强及其膜性能的变化,适宜的添加量可有效地改良胶原纤维膜的性能。In order to improve the properties of collagen films,based on the electrostatic interaction between electronegative sodium polyacrylate and electropositive turgid collagen fibers,we evaluated the impact of adding different amounts of sodium polyacrylate(0.1%–1.0%)on membrane properties.The results showed that Zeta potential of the film-forming suspension significantly changed with the increase of sodium polyacrylate concentration(P<0.05)suggesting enhanced electrostatic interaction.Sodium polyacrylate addition decreased the elongation at break,light transparency and water vapor permeability(the minimum value reached 1.30×10-12 g/(cm?s?Pa))of the films and increased the thermal stability(up to 1.50 folds higher than that of pure films),but it had no impact on film thickness.Scanning electron microscopic analysis showed that the composite films were more compact.Addition of 0.3%sodium polyacrylate showed better film properties:tensile strength,elongation at break,light transparency and water vapor permeability were 37.60 MPa,14.20%,48.70%and 1.30×10-12 g/(cm?s?Pa),respectively.In addition,the conformational changes of the composite films were confirmed by Fourier transform infrared spectroscopy.The enhanced effect of sodium polyacrylate and collagen due to electrostatic interaction showed that appropriate addition of sodium polyacrylate could effectively improve collagen membrane properties.

关 键 词：胶原蛋白 聚丙烯酸钠 静电相互作用 性能 可食膜 

分 类 号：TS206.1[轻工技术与工程—食品科学]