不同溶解再生方式对壳聚糖膜结构及性能的影响  

Effects of Different Dissolution and Regeneration Methods on the Structure and Properties of Chitosan Film

作　　者：望运滔 刘荣钦 张文舒 冯静莹 王旭冉 白艳红 WANG Yuntao;LIU Rongqin;ZHANG Wenshu;FENG Jingying;WANG Xuran;BAI Yanhong(Henan Key Laboratory of Cold Chain Food Quality and Safety Control,Henan Province Collaborative Innovation Center of Food Production and Safety,College of Food and Bioengineering,Zhengzhou University of Light Industry,Zhengzhou 450001,China)

机构地区：[1]郑州轻工业大学食品与生物工程学院,河南省冷链食品质量安全控制重点实验室,食品生产与安全河南省协同创新中心,河南郑州450001

出　　处：《食品科学》2024年第20期214-219,共6页Food Science

基　　金：国家自然科学基金面上项目(32272367)。

摘　　要：本研究比较了酸溶-碱中和(CS-Na)、碱/尿素体系低温溶解-热诱导(CS-60℃)、碱/尿素体系低温溶解-乙醇絮凝(CS-C_(2)H_(6)O)3种方法对所制备壳聚糖膜性能(机械强度、透光率、水蒸气透过率)及结构(基团变化、结晶结构、微观结构)的影响规律。结果表明,CS-Na的拉伸强度为0.064 MPa,断裂伸长率为34.72%,碱/尿素体系所制备的两种壳聚糖膜拉伸强度和断裂伸长率均有明显的提升,表明碱/尿素体系所制备的壳聚糖膜具有更好的机械性能;在紫外光区内,CS-C_(2)H_(6)O的透光率最强,CS-60℃的透光率次之,CS-Na的透光率最弱,表明3种壳聚糖膜均具有良好的阻挡紫外线的能力;3种壳聚糖膜的水蒸气透过率在饱和NaCl和饱和MgCl2条件下均呈现出CS-60℃<CS-C_(2)H_(6)O<CS-Na,表明碱/尿素体系溶解壳聚糖经热诱导后所形成的壳聚糖膜具有最好的水蒸气阻挡能力。红外光谱图和X射线衍射图显示,碱/尿素体系能最大程度增强壳聚糖分子间氢键的相互作用;酸溶壳聚糖和碱/尿素体系溶解壳聚糖所制备的壳聚糖膜在溶解-再生过程中均发生了分子链重排,且碱/尿素体系-60℃热水浴处理更有利于壳聚糖膜纳米纤维结构的形成。扫描电镜结果表明,CS-60℃相较于CS-C_(2)H_(6)O、CS-Na两种膜的横截面呈现出更加致密均匀的多孔结构,其表面也更加平整光滑。综合表明,CS-60℃具有更强的机械性能和更加均匀紧凑的多孔结构。因此,碱/尿素体系溶解壳聚糖在热水浴条件下所制备的高强度壳聚糖膜在食品包装等方面具有更好的应用前景。In this study,the effects of three different preparation methods,acid dissolution followed by alkali regeneration(CS-Na),alkali-urea dissolution followed by hot water regeneration(CS-60℃),and alkali dissolution followed by alcohol regeneration(CS-C_(2)H_(6)O)on the properties(mechanical strength,light transmittance,water vapor transmission rate(WVTR))and structure(groups,crystalline structure and microstructure)of chitosan film were investigated.It was found that the tensile strength of the CS-Na film was 0.064 MPa,and the elongation at break was 34.72%.The tensile strength and elongation at break of the two chitosan films prepared with alkali-urea system were significantly improved,indicating better mechanical properties.All three chitosan films had excellent ultraviolet(UV)barrier capacity;the CS-C_(2)H_(6)O film had the highest UV transmittance,the CS-60℃film was in the middle,and the CS-Na film had the lowest UV transmittance.The WVTR of these films under saturated NaCl and MgCl2 conditions decreased in the following order:CS-60℃<CS-C_(2)H_(6)O<CS-Na,indicating that the CS-60℃film had the best water vapor barrier capacity.The results of Fourier transform infrared spectroscopy(FTIR)and X-ray diffraction(XRD)indicated that alkali-urea system could enhance the hydrogen bonding between chitosan molecules to the largest extent.Molecular chain rearrangement occurred in all these chitosan films during the dissolution-regeneration process,and hot water bath at 60℃was more conducive to the formation of nanofiber structure in chitosan films.Scanning electron microscopy(SEM)results suggested that the cross-section of CS-60℃presented a denser and more uniform porous structure.Moreover,the surface of this film was much smoother than that of the CS-C_(2)H_(6)O and CS-Na films.Overall,the CS-60℃film had better mechanical properties and a more uniform porous structure,and therefore could have better application prospects in the field of food packaging.

关 键 词：壳聚糖 高强度壳聚糖膜 碱/尿素体系 微观结构 

分 类 号：TS206.4[轻工技术与工程—食品科学]