Prachayawarakorn Jutarat, Kansanthia Pornthip
Department of Chemistry, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang (KMITL), Bangkok 10520, Thailand; Advanced Materials Research Unit, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang (KMITL), Bangkok 10520, Thailand.
Department of Chemistry, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang (KMITL), Bangkok 10520, Thailand.
Int J Biol Macromol. 2022 Jan 1;194:331-337. doi: 10.1016/j.ijbiomac.2021.11.150. Epub 2021 Nov 30.
Poor properties of native cassava starch film such as low mechanical properties and high water uptake are the limitations of biodegradable starch films. Dual modification is an alternative way to improve the properties. Characteristics and properties of oxidized, crosslinked and dually modified starch films by hydrogen peroxide oxidation and glutaraldehyde crosslinking were examined. Sequence of the dual modification was also studied. All starch films were prepared by casting technique using glycerol plasticizer. The oxidation and crosslinking of modified starch were confirmed by carbonyl and carboxyl contents as well as degree of crosslinking. The lowest and highest molecular weights of the modified starch were observed for the oxidized starch and crosslinked starch, respectively. Moreover, swelling power and moisture absorption of dually modified starch films was clearly lower than those of singly modified films. Additionally, both good stiffness and extensibility was also obtained from the dually modified films especially for the crosslinked-oxidized film. Moreover, thermal property and biodegradability were also determined.
天然木薯淀粉膜的性能较差，如机械性能低和吸水率高，这是可生物降解淀粉膜的局限性。双重改性是改善其性能的一种替代方法。研究了用过氧化氢氧化和戊二醛交联对淀粉膜进行氧化、交联和双重改性后的特性和性能。还研究了双重改性的顺序。所有淀粉膜均采用甘油增塑剂通过流延技术制备。通过羰基和羧基含量以及交联度证实了改性淀粉的氧化和交联。氧化淀粉和交联淀粉分别观察到改性淀粉的最低和最高分子量。此外，双重改性淀粉膜的溶胀能力和吸湿率明显低于单一改性膜。此外，双重改性膜，特别是交联氧化膜，还具有良好的刚度和延展性。此外，还测定了热性能和生物降解性。
