芦荟甙的伏安行为及其应用研究

STUDIES ON THE VOLTAMMETRIC BEHAVIOUR OF BARBALOIN AND ITS APPLICATION

摘要: 芦荟甙在0.1mol·L^-1 H₂SO₄底液中,出现一灵敏的示波极谱导数峰,峰电位为-0.75V(vsSCE),峰电流与芦荟甙浓度在2.0×10^-7～6.0×10^-6mol·L^-1范围内成线性关系,用于芦荟原胶中芦荟甙的测定。用线性扫描和循环伏安法等手段研究体系的伏安行为,特别是吸附性。实验表明,该体系属具有吸附性的可逆过程。

Abstract: In 0.1 mol·L^-1 H₂SO₄ solution, a well-defined reduction wave of barbaloin was obtained by singlesweep oscillopolarography. The peak potential was shown to be -0.75 V (vs SCE). The peak current is proportional to the concentration of barbaloin over the range of 2.0×10^-7～6.0×10^-6 mol·L^-1. The detection limit is 2.0×10^-7 mol·L^-1. The voltammetric behaviour of the system was studied by linear sweep and cyclic voltammetry. The adsorption coefficient β was 1.91×10⁵. The interaction factor α was 1.12. The system is a reversible adsorption wave.