The pyrrolizidine alkaloids(PAs) in leaf of Gynura divaricata(L.) DC.was analyzed by LC-MSn technique.The result shows that two hepatotoxic pyrrolizidine alkaloids(HPAs) are detected from the methanol extract of G.div...The pyrrolizidine alkaloids(PAs) in leaf of Gynura divaricata(L.) DC.was analyzed by LC-MSn technique.The result shows that two hepatotoxic pyrrolizidine alkaloids(HPAs) are detected from the methanol extract of G.divaricata leaf,with relative molecular weight of 335 and 365,respectively and lower content.The constituent with relative molecular weight 335 is a retronecine-type alkaloid,and identified as integerrimine;another constituent with relative molecular weight 365 is an otonecine-type alkaloid,speculated to be isomer of usaramine or 18-hydroxyinterrimine.展开更多
Here we report a sensitive LC-MS/MS method capable of quantifying n-Butylphthalide (NBP) down to 0.5 ng/mL in rat and human hepatic microsome incubating solutions.The method was validated over linear range of 0.5-4 00...Here we report a sensitive LC-MS/MS method capable of quantifying n-Butylphthalide (NBP) down to 0.5 ng/mL in rat and human hepatic microsome incubating solutions.The method was validated over linear range of 0.5-4 000 ng/mL using diazepam as the internal standard.Compound was simply prepared by protein precipitation method and analyzed on the LC-MS/MS,which was an API-4000 system equipped with ESI interface and a Symmetry C18 column.The between-day and within-day precision and accuracy of quality control samples were ≤9.3% RSD% and ≤3.3% RE%.Sample stability (Stock solution,freeze/thaw,bench-top,short-term and long-term stability) were also investigated.This method has been applied to drug-drug interaction study of NBP in rat and human hepatic microsome incubating solutions.展开更多
文摘The pyrrolizidine alkaloids(PAs) in leaf of Gynura divaricata(L.) DC.was analyzed by LC-MSn technique.The result shows that two hepatotoxic pyrrolizidine alkaloids(HPAs) are detected from the methanol extract of G.divaricata leaf,with relative molecular weight of 335 and 365,respectively and lower content.The constituent with relative molecular weight 335 is a retronecine-type alkaloid,and identified as integerrimine;another constituent with relative molecular weight 365 is an otonecine-type alkaloid,speculated to be isomer of usaramine or 18-hydroxyinterrimine.
基金Scholarship for Stabilizing Tablent from Hunan Agricultural University (05WD11)Scholarslip for Excellent Youthfrom Hunan Education Department (07B035)
文摘Here we report a sensitive LC-MS/MS method capable of quantifying n-Butylphthalide (NBP) down to 0.5 ng/mL in rat and human hepatic microsome incubating solutions.The method was validated over linear range of 0.5-4 000 ng/mL using diazepam as the internal standard.Compound was simply prepared by protein precipitation method and analyzed on the LC-MS/MS,which was an API-4000 system equipped with ESI interface and a Symmetry C18 column.The between-day and within-day precision and accuracy of quality control samples were ≤9.3% RSD% and ≤3.3% RE%.Sample stability (Stock solution,freeze/thaw,bench-top,short-term and long-term stability) were also investigated.This method has been applied to drug-drug interaction study of NBP in rat and human hepatic microsome incubating solutions.