摘要
在乙醇量小于5%的水溶液中,于pH1.5至4.5,4.2至9.5分别得到槲皮素的两个还原波,均为羰基两电子还原.前者为其分子的强吸附波,后者为一价阴离子的波.在pH6.1附近的醋酸盐缓冲底液中,可获得槲皮素与Tb(Ⅲ)、Dy(Ⅲ)、Ho(Ⅲ)、Er(Ⅲ)、Tm(Ⅲ)、Yb(Ⅲ)、Lu(Ⅲ)和Y(Ⅲ)等重稀土离子络合物的双重表面催化氢波.络合物被诱导吸附,组成为(REL2)L吸.Sc(Ⅲ)与槲皮素形成单一表面催化氢波,其组成为(ScL)L吸.
The electrochendcal behavior of quercetin among the pH range from 1.5 to 9.5 was studied. In the pH 1.5 to 4.5 and 4.2 to 9.5, two reducing waves were obtained respectively. The former is an irreversible adsorptive wave of molecular quercetin and the latter is an irreversible wave of anodic ion of quercetin. In the buffer sohition of 0.1mol·L(-1) HAc-NaAc, at pH 6.1, the surface catalytic hydrogen waves of the complexes of heavy rare earth ions-quercetin were obtained by single-sweep polarography. The compositions of adsorptive complexes were determined as RE(Ⅲ): Qu=1:3 by using polarography. In the solution, the compositions of the complexes were determined as RE(Ⅲ): Qu=1:2 by using photometry. This means that the adsorption of the complex is the pattern of induced adsorption.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1994年第6期489-494,共6页
Acta Physico-Chimica Sinica
基金
国家自然科学基金
关键词
槲皮素
伏安法
稀土金属
络合物
Quercetin, Heavy rare earth, Polarographic catalytic hydrogen wave, Voltammetry