期刊
RADIATION PHYSICS AND CHEMISTRY
卷 118, 期 -, 页码 61-69出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.radphyschem.2015.05.030
关键词
Cellulose nanocrystals; Irradiation; Redox pair; Carboxylic acids; Antiradical; Food packaging
资金
- National Science and Engineering Research Council of Canada (NSERC)
- FPInnovations (Pointe-Claire, Canada) through the RDC program
- International Atomic Energy Agency (IAEA) [PHI/13002, F22051]
Antiradical properties were introduced on cellulose nanocrystals (CNCs) by redox pair (RP) initiator and gamma-radiation treatments. Different procedures were tested on CNC, first a 2 h reaction of hydrogen peroxide (H2O2)/ascorbic acid (AA) was performed on CNC solution. gamma-Radiation treatment at 20 kGy dose was then applied and immediately after GA was reacted during 24 h with the pretreated CNCs, giving CNC-H2O2-AA-gamma-GA. The formation of new carboxylic acids and carbonyl groups were characterized by FT-IR at 1650 and 1730 cm(-1) respectively. Carboxylic acid functionalities were also analyzed by conductometric titration where an increase from 49 to 134 mmol COOH kg(-1) was found from native to irradiated CNCs. A similar increase in the carboxylic acid content (132 mmol kg(-1)) was observed for CNC-H2O2-AA-gamma-GA, showing the highest radical scavenging properties (8 mM Trolox eq/mg CNC). Thermogravimetric analysis confirmed the structural changes onto CNC. Film packaging containing 20% of CNC-H2O2-AA-gamma-GA was then added to a gellan-based film packaging. A significant improvement (p < 0.05) of the tensile strength (TS), the tensile modulus (TM) and the elongation at break (EB) and water vapor permeability reduction was observed when CNC-H2O2-AA-gamma-GA was added to the film packaging formulation. (C) 2015 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据