纤维素纳米纤丝/普鲁兰酶体系对淀粉膜性能的影响研究

Effects of Cellulose Nanofibril/Pullulanase System on the Performance of Starch Film

关键词:  淀粉  普鲁兰酶  纤维素纳米纤丝  淀粉膜

Key Words:starch  pullulanase  cellulose nanofibril  starch film

摘要:本研究分析了纤维素纳米纤丝（CNF）/普鲁兰酶（Pul）体系对淀粉膜性能的影响。结果表明，CNF/Pul体系处理后的淀粉具有更高的短程有序性及更多的双螺旋结构，且淀粉晶型中出现了B型特征峰。CNF/Pul体系处理后得到的淀粉膜具有良好的表面均匀性和机械性能，该膜的拉伸强度从2.44 MPa（Nature-StF）增至7.32 MPa（CNF/Pul-StF），增加了2倍。光/水蒸气透过率测试结果表明，CNF/Pul体系处理后的淀粉膜具有更好的光学透过性，且对水蒸气阻隔性能有一定的增强作用。CNF/Pul体系处理后淀粉膜的光学透过率从49.3%~51.2%（Nature-StF）增至56.1%~60.1%（CNF/Pul-StF），且水蒸气透过系数从9.26×10^-12 g·cm/(Pa·s·cm²)（Nature-StF）减至6.33×10^-12 g·cm/(Pa·s·cm²)（CNF/Pul-StF）。

Abstract:This study analyzed the effect of cellulose nanofibril（CNF）/pullulanase（Pul）system on the performance of starch film. The results showed that the CNF/Pul treated starch exhibited higher short-range orderliness and more double helix structure，and there were additional B-type typical peaks existing in the treated starch. The obtained starch film with CNF/Pul treatment had good surface uniformity and better strength property. The tensile strength of starch film was increased from 2.44 MPa（Nature-StF） to 7.32 MPa（CNF/Pul-StF）， with a 200% increase. The results of the light/water vapor transmittance test indicate that the starch film treated with the CNF/Pul system had better optical transmittance and a certain enhancement effect on the water vapor barrier performance. The optical transmittance of starch film treated with CNF/Pul system increased from 49.3%~51.2% （Nature-StF） to 56.1%~60.1% （CNF/Pul-StF）， and water vapor transmission index， decreased from 9.26×10^-12 g·cm/(Pa·s·cm²) （Nature-StF） to 6.33×10^-12 g·cm/(Pa·s·cm²) （CNF/Pul-StF）.