碘化大蒜素的制备及其碘含量的测定

Synthesis of Iodide-diollyltrisulfide and Determination of Iodide

关键词:  碘化大蒜素  合成  碘含量  电导滴定

Key words:  Iodide-diollyltrisulfide  synthesis  contents of iodide  conductometric titration

摘要:

目的对文献报道的合成碘化大蒜素的工艺进行改进，同时探索测定其碘含量的新方法。方法通过回流大蒜素与碘在乙醇中的混合物，合成碘化大蒜素，通过改换溶剂分离出产物。先经氧瓶燃烧法进行有机破坏，后用硝酸银标准溶液-电导滴定法测定碘的含量。结果改进的合成工艺避免了回收乙醇时碘化大蒜素的挥发，提高了产率。硝酸银标准溶液-电导滴定法测定碘的含量与文献报道的氧瓶燃烧-硝酸汞标准溶滴定法的测定结果一致。结论用改换溶剂法分离出产物，可以提高产物的产率。电导滴定法可以准确的测出碘的含量，准确度和精密度都较高，该测定法可行。

Abstract:

OBJECTIVE This text introduced an improvement of the method to synthesize iodide-diollyltrisulfide. And then it explored a method to determine the contents of iodide. METHODS Through backstreaming to synthesize iodide-diollyltrisulfide using allicin and iodude in ethanol, the product is isolated through changing the solvent. And then the contents of iodide by AgNO3 standard solution- conductometric titration after being destroyed through burning in oxygen flask were determined. RESULTS Volatilization of iodide-diollyltrisulfide was avoid when ethanol was distilled out from the system to obtain the object. The yield was increased. The determination result of the contents of iodide by AgNO3 standard solution-conductometric titration after being destroyed through burning in oxygen flask was agree with that of another method-Oxygen flask HgNO3 standard solution method.CONCLUSION The modified method can avoid the lose of iodide-diollyltrisulfide when ethanol is distilled out from the system, and make a higher yield,conductometric titration has a high accuracy and precision, which can be used to determine the contents of iodine exactly.