纤维素酶调控预处理对MFC膜包装性能的影响  

Effect of Cellulase-regulated Pretreatment on Packaging Performance of MFC Film

作　　者：牛袁袁 张正健[1] 高萌[1] 张启莲[1] NIU Yuan-yuan;ZHANG Zheng-jian;GAO Meng;ZHANG Qi-lian(Key Laboratory of Food Packaging Materials and Technology in China Light Industry,Tianjin University of Science&Technology,Tianjin 300222,China)

机构地区：[1]天津科技大学中国轻工业食品包装材料与技术重点实验室,天津300222

出　　处：《包装工程》2020年第9期109-116,共8页Packaging Engineering

基　　金：天津市自然科学基金(18JCQNJC76800);天津市教委科研计划(2018KJ096,2018KJ095);天津市企业科技特派员项目(19JCTPJC55200)。

摘　　要：目的提高纤维素酶预处理效率,改善微纤化纤维素(MFC)薄膜的性能。方法以漂白桉木硫酸盐浆为原料,通过分别添加阳离子聚合物聚二甲基二烯丙基氯化铵(PDADMAC)和聚丙烯酰胺(CPAM)来调控纤维素酶的酶活性(Cx酶活性),并对比分析阳离子种类和添加量对MFC薄膜拉伸性能、透氧性能、透光性能的影响。结果高电荷量、低分子量的PDADMAC对酶活性的提升作用较大,提高了酶的预处理效率;高分子量、高电荷量的CPAM虽然降低了酶活性,但在一定程度上有效控制了酶在无定形区的过度水解,有利于薄膜力学性能、阻隔性能的提高。结论添加阳离子聚合物能够提高纤维素酶的Cx酶活性,进而提高纤维素酶对漂白桉木硫酸盐浆的预处理效率,最终获得性能优良的MFC薄膜产品。The work aims to improve the pretreatment efficiency of cellulase and the performance of microfibrillated cellulose(MFC) film. With bleached eucalyptus sulfate pulp as raw material, the activity of cellulase(Cx activity) was regulated by respectively adding cationic polymers polydimethyl diallyl ammonium chloride(PDADMAC) and polyacrylamide(CPAM). The effects of cationic types and dosage on the tensile strength, oxygen permeability and light transmittance of MFC film were compared and analyzed. PDADMAC with high charge amount and low molecular weight had a greater effect on the improvement of enzyme activity, which improved the pretreatment efficiency of the enzyme. Although CPAM with high molecular weight and high charge amount reduced the enzyme activity, to a certain extent, it effectively controlled the excessive hydrolysis of the enzyme in the amorphous region, which was beneficial to the enhancement of the mechanical properties and barrier properties of the film. The cationic polymers added can improve the Cx activity of cellulase, and thus improve the pretreatment efficiency of cellulase on bleached eucalyptus sulfate pulp, and finally obtain MFC film products with excellent performance.

关 键 词：纤维素酶 调控 阳离子聚合物 MFC薄膜 

分 类 号：TB484.3[一般工业技术—包装工程]