枸橼酸铋钾的分子组成研究

目的：考察枸橼酸铋钾的分子组成。方法：采用容量法测定铋含量,原子吸收法测定钾的含量,离子色谱法测定枸橼酸根的含量,核磁共振氢谱进行结构推测;采用X-衍射试验和电子显微镜扫描法对晶型结构进行初步研究;加速稳定性试验考察3个分子组成部分在试验前后百分含量之比的变化。结果：以干燥品计,本品3个分子组成部分的百分含量分别为：铋35%-38%,钾7%-11%,枸橼酸根49%-52%,核磁图谱和数据显示本品有3种同分异构体,分子结构组成可能为铋∶钾∶枸橼酸=2∶2∶2;X-衍射试验和电镜扫描结果表明本品可能存在无定形、单晶和多晶3种形态;3个结构组成部分在加速试验前后的百分含量之比基本一致。结论：枸橼酸铋钾的3个结构组成部分的百分含量在一定范围内,可能存在3种不同的晶型形态,本品结构组成较稳定。

Study on Molecular Composition of Bismuth Potassium Citrate

Objective：To study the molecular composition of bismuth potassium citrate. Methods：The content of bismuth was determined using a volumetric method, the content of potassium was determined by atomic absorption spectrometry, and the content of citrate root was determined by ion chromatography. The structure was predicted using 1 HNMR and the crystal structure was studied using X-diffraction test and scanning electron microscopy. The changes in the percentage ratio of the three components were investigated by accelerated stability tests. Results：On the dried basis, the percentage of the three molecular components was bismuth of 35%-38%, potassium of 7%-11% and root citrate of 49%-52%. The NMR spectra and the data indicated that the product had three isomers with the molecular structure of bismuth∶potassium∶root citrate=2∶2∶2. The X-diffraction test and SEM showed that the three forms of amorphous, monocrystalline and polycrystalline might exist. The percentage ratio of the three elements before and after the stability test was basically stable. Conclusion：Bismuth potassium citrate may have three crystal forms with the percentage of the three structure parts within a certain range, and the structure is relatively stable.