青藤碱和黄芩甙的极谱特性

用单扫示小极谱法研究了青藤碱和黄芩甙的电化学行为，青藤碱在０．１ｍｏｌ／Ｌ Ｎａ２Ｂ４Ｏ７中有两个还原峰，峰Ｐ１和Ｐ２的电位分别为－１．４５Ｖ和－１．６７Ｖ，峰Ｐ１的峰电流与浓度在０．０６－１．８ｍｇ／Ｌ和２．０－３４．６ｍｇ／Ｌ范围内呈线性关系，检测限为０．０２ｍｇ／Ｌ，在０．０５ｍｏｌ／Ｌ棕檬酸钠＋０．２ｍｏｌ／Ｌ ＨＣｌ底液中，黄芩甙于－１．１４Ｖ（Ｐ３０和－１．３２Ｖ（Ｐ４）处产生两还原峰

Polarographyic Character of Baicalin and Sinomenine

The electrochemical behaviour of baicalin and sinomenine is studied by single sweep oscillopolarography. Sinomenine shows two reduction waves in 0. 1 mol/L Na,B.O, base solution and the peak potentials are - 1. 45 V and - 1. 67 V (vs. SCE) respectively. The peak height of wave P, is proportional to the concentration in the range of 0. 06 - 1. 8 mg/L and 2. 0-34. 6 mg/L respectively, and the detection limit is 0. 02 mg/L. In the base solution of 0. 05 mol/L trisodium citrate +0. 2 mol/L HCl, baicalin shows two reduction waves with the peak potentials - 1. 14 V(P3) and 1. 32 V(P4) (vs. SCE), respectively. The peak height of the first wave (P3) is proportional to the concentration in the range of 0. 16- 0. 64 mg/L and 0. 72-24 mg/L respectively, and the detection limit is 0. 08 mg/L. It is em- ployed for the determination of totol alkaloids in sinomenium acutum (Thumb. ) Rehd. et Wils and baicalin in Scutellaria Daicalensis Georgi. In addition, it is discus8ed that sinomenine and baicalin can scavenge superoxide anion radical produced by the auto-oxidation of pyrogallol.