目的：为减少实验动物的使用,利用化学物质的体外细胞毒性数据对体内急性毒性进行预测。方法：MTT比色法检测7种新化学实体对CHL细胞的毒性作用,利用RC（Registry of Cytotox-icity）预测模型对急性毒性LD50值进行预测,并使用小鼠急性...目的：为减少实验动物的使用,利用化学物质的体外细胞毒性数据对体内急性毒性进行预测。方法：MTT比色法检测7种新化学实体对CHL细胞的毒性作用,利用RC（Registry of Cytotox-icity）预测模型对急性毒性LD50值进行预测,并使用小鼠急性毒性上下法进行验证。结果：各化合物（1～7）细胞毒性IC50值分别为0.43、0.49、0.18、0.67、3.03、1.68、1.79mg/mL;根据RC预测模型,急性毒性LD50的预测值分别为2376.4、2478.3、1574.8、2087.6、4897.3、3331.8、3300.7mg/kg。经上下法检测,4号化合物的LD50值为1634.0mg/kg,其余6种化合物的LD50值均大于2000.0mg/kg。分别以预测值和实测值为依据对化合物毒性进行分级,二者相比,仅3号和4号化合物毒性分级略有差异,其它5种化合物的毒性分级基本一致。结论：体外细胞毒性数据可用来预测体内急性毒性,减少实验动物使用。展开更多
Objective To measure the acute toxicity of halogenated benzenes to bacteria in natural waters and to study quantitative relationships between the structure and activity of chemicals. Methods The concentration values c...Objective To measure the acute toxicity of halogenated benzenes to bacteria in natural waters and to study quantitative relationships between the structure and activity of chemicals. Methods The concentration values causing 50% inhibition of bacteria growth （24h-IC50） were determined according to the bacterial growth inhibition test method. The energy of the lowest unoccupied molecular orbital and the net charge of carbon atom of 20 halogenated benzenes were calculated by the quantum chemical MOPAC program. Results The logl/IC50 values ranged from 4.79 for 2,4-dinitrochlorobenzene to 3.65 for chlorobenzene. A quantitative structure-activity relationship model was derived from the toxicity and structural parameters： logl/IC50 =-0.531（ELUMO）＋1.693（Qc）＋0.163（logP）＋3.375. This equation was found to fit well （r^2=0.860, s=0.106）, and the average percentage error was only 1.98%. Conclusion Halogenated benzenes and alkyl halogenated benzenes are non-polar narcotics, and have hydrophobicity-dependent toxicity. The halogenated phenols and anilines exhibit a higher toxic potency than their hydrophobicity, whereas 2,4-dinitrochlorobenzene is electrophile with the halogen acting as the leaving group.展开更多
文摘目的：为减少实验动物的使用,利用化学物质的体外细胞毒性数据对体内急性毒性进行预测。方法：MTT比色法检测7种新化学实体对CHL细胞的毒性作用,利用RC（Registry of Cytotox-icity）预测模型对急性毒性LD50值进行预测,并使用小鼠急性毒性上下法进行验证。结果：各化合物（1～7）细胞毒性IC50值分别为0.43、0.49、0.18、0.67、3.03、1.68、1.79mg/mL;根据RC预测模型,急性毒性LD50的预测值分别为2376.4、2478.3、1574.8、2087.6、4897.3、3331.8、3300.7mg/kg。经上下法检测,4号化合物的LD50值为1634.0mg/kg,其余6种化合物的LD50值均大于2000.0mg/kg。分别以预测值和实测值为依据对化合物毒性进行分级,二者相比,仅3号和4号化合物毒性分级略有差异,其它5种化合物的毒性分级基本一致。结论：体外细胞毒性数据可用来预测体内急性毒性,减少实验动物使用。
基金This work was supported by the National 973 Great Foundation Research Item of China (2002CB412303) and the National Natural Science Foundation of Jiangsu Province (BK2004118).
文摘Objective To measure the acute toxicity of halogenated benzenes to bacteria in natural waters and to study quantitative relationships between the structure and activity of chemicals. Methods The concentration values causing 50% inhibition of bacteria growth （24h-IC50） were determined according to the bacterial growth inhibition test method. The energy of the lowest unoccupied molecular orbital and the net charge of carbon atom of 20 halogenated benzenes were calculated by the quantum chemical MOPAC program. Results The logl/IC50 values ranged from 4.79 for 2,4-dinitrochlorobenzene to 3.65 for chlorobenzene. A quantitative structure-activity relationship model was derived from the toxicity and structural parameters： logl/IC50 =-0.531（ELUMO）＋1.693（Qc）＋0.163（logP）＋3.375. This equation was found to fit well （r^2=0.860, s=0.106）, and the average percentage error was only 1.98%. Conclusion Halogenated benzenes and alkyl halogenated benzenes are non-polar narcotics, and have hydrophobicity-dependent toxicity. The halogenated phenols and anilines exhibit a higher toxic potency than their hydrophobicity, whereas 2,4-dinitrochlorobenzene is electrophile with the halogen acting as the leaving group.
