摘要
采用半经验ＭＮＤＯ法完成了对溪黄草中３种抗癌组分的量子化学计算．获得了分子轨道及其能级、键级、原子电荷密度等数据．结果表明：该类化合物的抗癌活性区域α－亚甲基环戊酮中的部分原子轨道构成了易接受电子的πＬＵＭＯ轨道，当药物分子与受体作用时易在活性区域发生亲核加成反应．
This paper, reports a new method for detecting calcium in food by direct potentiometry with calcium ion selective electrode The optimal detecting condition is selected, It includes: 0 1mol/L KCl as TISAB, pH=5 0 controlled by HAc-NaAc buffer solution and 0 001mol/L sulfosalicylic acid to shelter the interference of Fe In this condition, the potentials of cell are linear response to logC in the range of -5 0￣-1 0 with the obliqeity 28 9mv/p Ca This method has been used to detect calcium in food with the recovery 97%￣102% and the results are good agreement with EDTA titration method
出处
《郑州大学学报（自然科学版）》
CAS
1997年第3期80-86,共7页
Journal of Zhengzhou University (Natural Science)
基金
山东大学晶体材料实验室课题
