中药制草乌中重金属、六六六及滴滴涕含量分析

目的:通过对制草乌进行重金属、六六六及滴滴涕的含量分析,了解制草乌中重金属、六六六及滴滴涕含量的情况,为质量标准的制定提供依据.方法:按食品检验标准方法,分别用原子吸收分光光度计和原子荧光分光光度计对制草乌进行铅与镉、砷与汞等重金属测定;采用毛细管气相色谱测定六六六、滴滴涕含量.结果:制草乌中汞、六六六及滴滴涕的含量符合汞≤0.2 mg·kg-1、BHC≤0.1 mg·kg-1、DDT≤0.1 mg·kg-1的规定;重金属铅、镉、砷含量不符合铅≤5.0mg·kg-1、镉≤0.3 mg·kg-1、砷≤2.0 mg·kg-1的规定,10个样品中有7个样品铅含量偏高、有5个样品镉含量偏高、有8个样品砷含量偏高.结论:重金属铅、镉、砷含量偏高;汞、六六六、滴滴涕含量正常.     

生姜中六六六、滴滴涕、三氯杀螨醇的CARB／NH2固相萃取柱-气相色谱测定法

目的建立CARR／NH2固相萃取柱前处理,气相色谱法测定生姜中六六六、滴滴涕、三氯杀螨醇的方法。方法样品切碎用乙腈提取、脱水、浓缩,CARB／NH：固相萃取柱净化,最后氮吹定容采用ECD检测器测定。结果该方法能很好地将4种六六六异构体、4种滴滴涕异构体和三氯杀螨醇分离开,各类同分异构体的加标回收率在85．7％-104．2％之间,相对测量不确定度小于10％,最低检出量为0．01ng。结论该方法能同时测定生姜中六六六、滴滴涕和三氯杀螨醇残留量,有较高的回收率。     

GC法检测浙八味药材中有机氯农药的残留

目的 测定与分析白术、白芍、玄参等8种药材中9种有机氯农药残留量.方法 以混合溶剂超声提取样品、浓硫酸磺化净化,采用毛细管气相色谱,用HP-5弹性石英毛细管柱程序升温分离,微电子捕获检测器检测,峰面积外标法定量.结果 延胡索、麦冬和杭白菊均检出滴滴涕,含量分别为0.439、45.017、5.434 ng·g<'-1>;杭白菊检出五氯硝基苯,含量为1.030 ng·g<'-1>;其余药材均未检出有机氯农药残留.结论 浙八味药材大部分未检出有机氯农药残留或含量较低,均在规定的安全范围内.     

Rapidly Progressive Intracranial Vasculopathy in Graft Versus Host Disease

After allogenic hematopoietic stem cell transplantation, cerebrovascular complications are uncommon, occurring in approximately 2%, and typically due to coagulopathy or infection. Graft versus host disease has been rarely reported to affect the central nervous system but these cases typically describe leukoencephalopathy, encephalitis, or perivascular infiltrates or vasculitis with subcortical ischemia or hemorrhage. We report a previously undescribed noninflammatory vasculopathy causing multifocal intracranial arterial occlusions and cerebral infarctions in a man following allogenic hematopoietic stem cell transplantation for chronic lymphocytic leukemia, which we propose to be a central nervous system manifestation of graft versus host disease.     

不同三七饮片中六六六、滴滴涕农药残留量的分析

目的建立三七饮片中有机氯农药六六六、滴滴涕的测定方法,为三七饮片中有机氯农药六六六、滴滴涕残留量监测提供可行的分析手段。方法采用毛细管气相色谱法测定六六六、滴滴涕含量,采集不同三七饮片27份进行检测。结果参照食品中六六六、滴滴涕残留量的测定方法(GB/T5009.19-1996)测定,六六六、滴滴涕在1~100μg/mL的浓度范围内与峰面积呈良好的线性关系,检测结果表明不同三七饮片中的农药残留量普遍低于三七国家标准(GB 19086-2003)中的农药残留量。结论毛细管气相色谱法测定三七饮片中有机氯农药六六六、滴滴涕的测定方法可靠。     

太子参中农药残留量检测

目的检测太子参药材中有机氯农药残留量。方法用毛细管气相色谱法对不同产地太子参中六六六、滴滴涕含量进行了检测。结果太子参中有机氯农药残留量符合BHC≤0.1 mg/kg、DDT≤0.1 mg/kg的规定,不同产区太子参中农药残留量有些差异。结论为太子参药材的质量评价提供数据。     

Placental transfer of pesticides in humans

Transfer of organochlorine pesticides from mother to fetus has been studied in 100 women. The concentrations of organochlorine pesticides were examined in maternal blood, placenta, and umbilical cord blood of the same mother/child pair. Residue levels of dichlorodiphenyl trichloro ethane (DDT) and its metabolites, isomers of benzene hexachloride (BHC) and aldrin were detected in all the samples analyzed, indicating their transfer from mother to the fetus. A correlation was found to exist between the pesticide concentration and age, dietetic habits and area of residence of pregnant women.     

Toxic and teratogenic effects of fenitrothion, BHC and carbofuran on embryonic development of the frog Microhyla ornata

The toxic and teratogenic effects of fenitrothion, benzene hexachloride (BHC) and carbofuran on the embryos and tadpoles of the frog Microhyla ornata were investigated for a period of 96 h. Of the three pesticides tested, fenitrothion was found to be most toxic and teratogenic and carbofuran the least toxic while BHC was intermediate. Tadpoles were observed to be more sensitive than the embryos to these pesticides. Abnormalities observed in embryos and tadpoles were the occurrence of blisters on the body, distention of body cavities, curvature of the body axis, poor blood circulation, poor pigmentation, retarded growth, loss of balance and abnormal behaviour.     

气相色谱法测定金线莲中六六六和滴滴涕农药残留

目的测定金线莲中六六六(BHC)和滴滴涕的残留情况。方法采用气相色谱法(GC)对金线莲中BHC(α-BHC、β-BHC、γ-BHC、δ-BHC)、滴滴涕(PP′-DDE、PP′-DDD、OP′-DDT、PP′-DDT)8种有机氯类农药残留的限量检测。结果 BHC、滴滴涕标准工作曲线的线性良好,相关系数0.998 8~0.999 7,平均回收率95.4%~98.9%,RSD为1.00%~2.98%。检出限为0.005 3~0.021μg/L。测定结果显示:β-BHC为0.000 9 mg/kg(其中α-BHC、γ-BHC、δ-BHC、PP'-DDE、OP'-DDT、PP'-DDD、PP'-DDT未检出)。结论该方法具有较高的灵敏度和线性范围,测定结果准确可靠,科学可行,可用于金线莲中BHC和滴滴涕农药残留的质量监控。     

西安市售红富士苹果中的六六六

目的建立测定苹果中六六六和滴滴涕农药残留量的气相色谱分析方法,测定西安市售的红富士苹果中的六六六和滴滴涕残留量。方法苹果捣碎用乙腈提取,盐析,用氮吹仪吹干,正己烷溶解,Florisil柱净化,滤液再次氮吹近干,正己烷定容,采用DB-1毛细管柱分离,ECD检测器测定。结果 6种六六六和滴滴涕能较好地分离,峰面积与其浓度均具有良好线性,3个水平的加标回收率在90.0%～106.1%之间,相对标准偏差均小于8.0%。采集的20份样品中,六六六和滴滴涕的残留量均符合国家标准要求。结论该方法简便,快速,灵敏,准确,可以满足苹果中六六六滴滴涕农药检测的需要。