Synaptic dysfunction occurs early in Alzheimer＇s disease （AD） and is acknowledged as a primary pathologic target for treatment. Synaptic degeneration is the pathological feature most strongly correlated with loss o...Synaptic dysfunction occurs early in Alzheimer＇s disease （AD） and is acknowledged as a primary pathologic target for treatment. Synaptic degeneration is the pathological feature most strongly correlated with loss of cognitive function ante mortern （Terry et al., 1991）. Synapses are heavily damaged in hippocampal and neocortical regions of AD brain, whereas motor and occipital cortices are relatively spared （Honer et al., 1992）. Despite extensive work, the molecular mechanisms underlying synaptic degeneration are largely unknown.展开更多
建立同时测定花生油中4种黄曲霉毒素(包括黄曲霉毒素B1、B2、G1、G2)的液相色谱-串联质谱法(liquidchromatography-tandem mass spectrometry,LC-MS/MS)。该方法经甲醇-水、三氯甲烷依次提取样品,以C18柱分离,流动相为乙腈-0.1%甲酸溶液...建立同时测定花生油中4种黄曲霉毒素(包括黄曲霉毒素B1、B2、G1、G2)的液相色谱-串联质谱法(liquidchromatography-tandem mass spectrometry,LC-MS/MS)。该方法经甲醇-水、三氯甲烷依次提取样品,以C18柱分离,流动相为乙腈-0.1%甲酸溶液(梯度洗脱),采用电喷雾正离子多反应监测(multiple reaction monitor,MRM)模式检测。结果表明:标准曲线在0.0～20.0μg/kg进样范围内线性良好;用本法测定4种黄曲霉毒素的回收率在70.8%～108.0%(低加标水平)、82.4%～104.5%(中和高加标水平)之间,相对标准偏差在5.7%～9.7%之间。运用所建立的方法对市售19种不同品牌和批次的花生油中的黄曲霉毒素进行分析,结果显示该方法选择性强、灵敏度高,适用于花生油中4种黄曲霉毒素的定性、定量测定。展开更多
基金Financial support was provided by the Alzheimer’s Australia Dementia Research Foundation Scholarship Program(AAR Postgraduate Research Scholarship),Alzheimer’s Association(USA)under grant#RG1-96-005the Judith Jane Mason and Harold Stannett Williams Memorial Foundation+1 种基金The Queensland Brain Bank,part of Australian Brain Bank Networksupported by an NHMRC(Australia)Enabling Grant No.605210
文摘Synaptic dysfunction occurs early in Alzheimer＇s disease （AD） and is acknowledged as a primary pathologic target for treatment. Synaptic degeneration is the pathological feature most strongly correlated with loss of cognitive function ante mortern （Terry et al., 1991）. Synapses are heavily damaged in hippocampal and neocortical regions of AD brain, whereas motor and occipital cortices are relatively spared （Honer et al., 1992）. Despite extensive work, the molecular mechanisms underlying synaptic degeneration are largely unknown.
文摘建立同时测定花生油中4种黄曲霉毒素(包括黄曲霉毒素B1、B2、G1、G2)的液相色谱-串联质谱法(liquidchromatography-tandem mass spectrometry,LC-MS/MS)。该方法经甲醇-水、三氯甲烷依次提取样品,以C18柱分离,流动相为乙腈-0.1%甲酸溶液(梯度洗脱),采用电喷雾正离子多反应监测(multiple reaction monitor,MRM)模式检测。结果表明:标准曲线在0.0～20.0μg/kg进样范围内线性良好;用本法测定4种黄曲霉毒素的回收率在70.8%～108.0%(低加标水平)、82.4%～104.5%(中和高加标水平)之间,相对标准偏差在5.7%～9.7%之间。运用所建立的方法对市售19种不同品牌和批次的花生油中的黄曲霉毒素进行分析,结果显示该方法选择性强、灵敏度高,适用于花生油中4种黄曲霉毒素的定性、定量测定。
