摘要
采用循环伏安法测量水溶液中β-环糊精(β-CD)/哌啶氮氧自由基(以2,2,6,6-四甲基哌啶-1-氧化物(TEMPO)为例)体系氧化还原电位及峰值电流,并基于此探讨TEMPO与β-CD之间的包结反应。电化学测量表明,在pH=7.4的磷酸盐缓冲溶液中,以玻碳电极为工作电极,随β-CD浓度增大,β-CD/TEMPO体系的峰电位不断增大,峰电流不断减小。通过电位法测得TEMPO与β-CD的包络比为1∶1,包络常数KS为154L/mol,与电流法测得的包络常数基本吻合。
Oxidation/reduction potentials and peak currents were measured by cyclic voltammetry for theβ-cyclodextrin(β-CD)/piperidine nitroxyl radicals system(2,2,6,6-tetramethylpiperidinyl-1-oxide,TEMPO)in aqueous solution.Based on these results,inclusion reaction between TEMPO and β-CD was investigated.Electrochemical measurements demonstrated that the peak potential increased and the peak current decreased with increasing concentration of β-CD.The inclusion ratio between β-CD and TEMPO was 1∶1.And the inclusion constant measured by the potential method was 154L/mol,which was close to the value measured by the current method.
出处
《分析科学学报》
CAS
CSCD
北大核心
2016年第3期349-352,共4页
Journal of Analytical Science
基金
国家自然科学基金(No.21303158)
江西省教育厅科学技术研究项目(赣教技字[12701]号)
关键词
循环伏安法
哌啶氮氧自由基
环糊精
包络常数
Cyclic voltammetry
Piperidine nitroxyl radical
Cyclodextrin
Inclusion constant