摘要
以合成的三水乙酸钠(SAT)-尿素和氯化胆碱(ChCl)-二水合草酸(H_(2)C_(2)O_(4)·2H2O)两种低共熔溶剂(DES)来研究明胶溶解再生前后结构和性能的变化。结果表明,SAT-尿素DES和ChCl-H_(2)C_(2)O_(4)·2H2O DES的最佳配比分别为n(SAT)/n(尿素)=0.67、n(ChCl)/n(H_(2)C_(2)O_(4)·2H2O)=1.00。两种DES溶解明胶没有造成明胶化学分子结构的变化,而是在一定程度上破坏了明胶分子间的氢键作用,导致结晶度和热稳定性略微降低。而SAT-尿素DES与明胶形成氢键的能力更强,破坏明胶分子间氢键的程度更高,但对三螺旋构象破坏程度较低,因此更适合溶解明胶。
Two deep eutectic solvents(DES),sodium acetate trihydrate(SAT)-urea and choline chloride(ChCl)-oxalic acid dihydrate(H_(2)C_(2)O_(4)·2H2O),were synthesized assolventsto dissolve gelatin.The differenceinstructure and property of gelatin before and after regeneration was investigated.The result indicated that the optimum stoichiometric ratios of SAT-urea DES and ChCl-H_(2)C_(2)O_(4)·2H2O DES weren(SAT)/n(urea)=0.67 and n(ChCl)/n(H_(2)C_(2)O_(4)·2H2O)=1.00,respectively.The chemical molecular structure of gelatin was not changed by DES,but the hydrogen bondsamong gelatin molecules were destroyed to some extent,leading to slightly lower crystallinity and thermal stability.SAT-urea DES had a stronger ability to form hydrogen bonds with gelatin and a higher degree to break the intermolecular hydrogen bonds of gelatin,but the damage degree of the tri-helix conformation was relatively low,so it was more suitable for dissolving gelatin.
作者
吴婷
徐浩杰
崔玉明
尤芳芳
陈慧
WU Ting;XU Haojie;CUI Yuming;YOU Fangfang;CHEN Hui(College of Biomass Science and Engineering,Sichuan University,Chengdu 610065,China;Key Laboratory of Leather Chemistry and Engineering of Ministry of Education,Sichuan University,Chengdu 610065,China;Luoyang Customs Integrated Technical Service Center,Luoyang 471000,China)
出处
《皮革科学与工程》
CAS
北大核心
2021年第5期1-5,共5页
Leather Science and Engineering
基金
四川省成都市科技项目(2018-YF05-01219-SN)
皮革化学与工程教育部重点实验室(四川大学)开放课题基金资助(20826041D4237)
四川大学大学生创新创业训练计划项目(C2021116145)。
关键词
低共熔溶剂
明胶
溶解
再生
性能
deep eutectic solvent
gelatin
dissolution
regeneration
property
