Chitosan samples irradiated with different doses were modified by acylation, and then their water solubility and viscosity were determined. In addition, the structures of acylated products were characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric/differential thermal analysis (TG/DTA), powder X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results indicated that the yield of chitosan acylation products decreased with increasing irradiation dose. Compared with chitosan, the water solubility and weight-average molecular mass of non-irradiated chitosan acylation products increased significantly and the corresponding viscosity declined dramatically. However, with increasing irradiation dose, the water solubility and weight-average molecular mass of irradiated chitosan acylation products showed no obvious changes, but the corresponding viscosity reduced significantly. FT-IR spectra and TG/DTA curves indicated that the hydrophilic group (carboxyl) was successfully introduced into chitosan via acylation. Meanwhile, XRD patterns and SEM images showed that the crystal structure of modified chitosan was damaged and porous structures were observed, which promotes the entrance of water molecules. Structure and properties are closely related; therefore, structural changes inevitably lead to changes in properties. Comparing the properties and structures of chitosan and its acylation products can provide a certain theoretical reference value for further applications of chitosan.
[1] Chakraborty S P, Sahu S K, Pramanik P, et al. Biocompatibility of folate-modified chitosan nanoparticles [J]. Asian Pacific Journal of Tropical Biomedicine, 2012, 2(3): 215-219
[2] Rinaudo M. Chitin and chitosan: properties and applications [J]. Progress in Polymer Science, 2006, 31(7): 603-632
[3] 马菲,邹朝辉,李淑荣,等.电子束辐照对壳聚糖分子量和结构的影响[J].核农学报,2013,27(7):0946-0951
MA Fei, ZHOU Zhao-hui, LI Shu-rong, et al. Effect of electron beam irradiation on molecular weight and structure of chitosan [J]. Journal of Nuclear Agricultural Science, 2013, 27(7): 0496-0951
[4] Satoh T, Kano H, Nakatani M, et al. 6-Amino- 6-deoxy-chitosan sequential chemical modifications at the C-6 positions of N-phthaloyl-chitosan and evaluation as a gene carrier [J]. Carbohydrate Research, 2006, 341(14): 2406-2413
[5] XIE W M, XU P X, WANG W, et al. Preparation an antibacterial activity of a water-soluble chitosan derivative [J]. Carbohydrate Polymers, 2002, 50(1): 35-40
[6] 王富花,刘中阳,张占军.壳聚糖的研究进展及其在食品医药工业中的应用[J].广州化工,2010,38(10):46-48
WANG Fu-hua, LIU Zhong-yang, ZHANG Zhan-jun. Research advance on chitosan and their application in medicine and food [J]. Guangzhou Chemical Industry, 2010, 38(10): 46-48
[7] 周研,谢晶,周然,等.Harpin处理结合羧甲基壳聚糖/海藻酸钠复合涂膜对哈密瓜保鲜效果的影响[J].现代食品科技,2015,31(4):248-252
ZHOU Yan, XIE Jing, ZHOU Ran, et al. Effect of harpin treatment combined with carboxymethyl chitosan-alginate composite coating on hami melon preservation [J]. Modern Food Science and Technology, 2015, 31(4): 248-252
[8] 张立彦,包丽坤.离子对壳聚糖/果胶聚电解质复合物溶胀性及微观结构的影响研究[J].现代食品科技, 2013, 29(10): 2353-2357
ZHANG Li-yan, BAO Li-kun. Effects of lons on swelling properties and microstructure of chitosan and pectin polyelectrolyte complexes [J]. Modern Food Science and Technology, 2013, 29(10): 2353-2357
[9] Krishnapriya K R, Kandaswamy M. A New chitosan biopolymer derivative as metal-complexing agent: synthesis, characterization, and metal(Ⅱ) ion adsorption studies [J]. Carbohydrate Research, 2013, 345(14): 2013-2022
[10] 林静雯,高丹,王小军.壳聚糖及其衍生物在废水处理中的研究进展[J].环境保护科学,2004,30(3):17-19
LIN Jing-wen, GAO Dan, WANG Xiao-jun. Study development on chitosan and its ramifications in wastewater treatment [J]. Environmental Protection Science, 2004, 30(3): 17-19
[12] 易喻,江威,王鸿,等.羧甲基壳聚糖的制备及性能研究[J].浙江工业大学学报,2011,39(1):16-20
YI Yu, JIANG Wei, WANG Hong, et al. Study on preparation and the performance of the carboxymethyl chitosan [J]. Journal of Zhejiang University of Technology, 2011, 39(1): 16-20
[13] 庄金娟,王香梅.改性壳聚糖的研究进展及其应用前景[J].天津化工,2011,25(2):7-9
ZHUANG Jin-juan, WANG Xiang-mei. The research progress of modified chitosan and its application prospect [J]. Tianjin Chemical Industry, 2011, 25(2): 7-9
[14] Duan W G, Shen C M, Fang H X, et al. Synthesis of dehydroabietic-modified chitosan and its drug release behavior [J]. Carbohydrate Research, 2009, 344(1): 9-13
[15] Aytekin A O, Morimura S, Kida K. Synthesis of chitosan-caffeic acid derivatives and evaluation of their antioxidant activities [J]. Journal of Bioscience and Bioengineering, 2011, 111(2): 212-216
[16] 中华人民共和国卫生部.GB2760-2011食品安全国家标准 食品添加剂使用标准[S].北京:中国标准出版社,2011
The ministry of health of the People,s Republic of China. GB2760-2011 Food safety national standards using standards of food additives [S]. Beijing: Standards Press of China, 2011
[17] 李云飞,葛克山,徐文达.食品工程原理(第二版)[M].北京:中国农业大学出版社,2009
LI Yun-fei, GE Ke-shan, XU Wen-da. Food engineering priciple(second edition) [M]. Beijing: China Agricultural University Press, 2009