三氯化钛-分光光度法测定决明子蒽醌

Determination of Anthraquinone by Titanium Trichloride-Spectrophotometry in Cassia obtusifolia L.

提出了三氯化钛 -分光光度法测定决明子中总蒽醌含量的新方法。该法是基于在强酸性介质中 ,亚钛盐可还原蒽醌类化合物 ,从而使紫色的亚钛盐转变为黄色的钛盐 ,该物质在 349nm处有最大吸收。该法的线性范围为 6～ 4 0 μg/mL ,r =0 .9996 ,回收率为 96 %～ 98%。

A new method for determining anthraquinone of Cassia obtusifolia L. by titanium trichloride-spectrophotometry was studied .It based on titanium trichloride could react with anthraquinone in acid aqueous solution to form yellow titanium tetrachloride which has the largest absorption in 349 nm. The liner range of the determination is 6～40 μg/mL with the recovery was 96%～98%.