目的建立超高效液相色谱-串联质谱法快速测定自制草乌药酒中9种乌头类生物碱含量的方法。方法以云南野生的滇草乌为主要原料,将草乌制成5种不同形状(整块、去皮、片状、块状、粉末状),分别取250 g浸泡于900 mL 52度玉米酿制白酒中,浸泡...目的建立超高效液相色谱-串联质谱法快速测定自制草乌药酒中9种乌头类生物碱含量的方法。方法以云南野生的滇草乌为主要原料,将草乌制成5种不同形状(整块、去皮、片状、块状、粉末状),分别取250 g浸泡于900 mL 52度玉米酿制白酒中,浸泡时间约为1.5年。移取1 mL药酒样品,加入30%甲醇水溶液(3:7,V:V)至100 mL,经0.22μm滤膜过滤后备测。利用C18色谱柱和乙腈-0.1%甲酸水的流动相进行梯度洗脱分离,多反应监测模式检测,通过基质工作曲线外标法定量。结果9种乌头类生物碱在1~100μg/L范围内线性关系良好,相关系数均大于0.999,检出限为0.63~0.98μg/L,定量限为2.11~3.26μg/L,低、中、高3种浓度水平下加标回收率为81.14%~116.01%,相对标准偏差为0.97%~11.26%(n=6)。经实际样品测定分析,药酒中9种乌头类生物碱的双酯型生物碱含量居高,其中以乌头碱含量最多,毒性较强。结论该方法前处理简便,灵敏度高,准确性好,检测效率高,适用于卫生应急中毒事件中自制草乌药酒9种乌头类生物碱的快速筛查,为医疗救治的快速诊断和采取对应急救治疗措施提供强有力技术支撑。展开更多
A trace analytical method based on solid-phase extraction gas chromatography-tandem mass spectrometry(SPE–GC–MS/MS)was developed for the rapid detection of 256 semi-volatile organic compounds(SVOCs),including 25 pol...A trace analytical method based on solid-phase extraction gas chromatography-tandem mass spectrometry(SPE–GC–MS/MS)was developed for the rapid detection of 256 semi-volatile organic compounds(SVOCs),including 25 polycyclic aromatic hydrocarbons(PAHs),70 polychlorinated biphenyls(PCBs),123 pesticides,20 phthalate esters(PAEs),4 organophosphate esters(OPEs),9 synthetic musks(SMs),and 5 UV filters(UVs)in water.No-tably,this method provided a decent linearity of calibration standards(R^(2)>0.999),excellent method limits of quantification(MLOQs)(0.12–11.41 ng/L),satisfactory matrix spiking recovery rates(60.4%–126%),and high precision(intra-day relative standard deviations(RSDs):1.0%–10.0%,inter-day RSDs:3.0%–15.0%,and inter-week RSDs:3.4%–15.7%),making it suitable for trace-level studies.Statistical analysis revealed that SVOCs with higher volatility exhibited enhanced recovery rates.Validation of the methodology involved analyzing SVOCs in real spring water and river water samples.Twenty-seven SVOCs were detected in spring water and 58 in river water,with an average concentration of 631.73 and 16,095 ng/L,respectively.Among the detected SVOCs,PAEs constituted the predominant proportion.This study underscored the presence of SVOCs contamination specifi-cally within the spring water,although SVOCs concentrations in river water were significantly greater than those found in spring water.In summary,this sensitive method based on SPE–GC–MS/MS was successfully developed and validated for the rapid analysis of a diverse array of 256 SVOCs at trace levels in water,including not only the traditional highly valued PAHs,PCBs,pesticides,and PAEs,but also the emerging OPEs,UVs,and SMs.展开更多
文摘该研究通过顶空固相微萃取-气相色谱-质谱联用技术(headspace-solid phase microextraction-gas chromatography-mass spectrometry,HS-SPME-GC-MS)和高通量测序技术系统解析了3种大曲的特征香气化合物及微生物群落结构。研究发现,3种大曲分为以吡嗪类或以酯类化合物为主体风味两类。采用多元统计分析并根据变量投影重要性指标(variable importance in the projection,VIP)分析共鉴定出31种特征香气化合物。利用高通量测序技术对大曲的细菌群落结构进行解析,结合相关性分析,从多个维度判定了其核心微生物为火山渣芽孢杆菌属(Scopulibacillus)和芽孢杆菌属(Bacillus),其与多种吡嗪类、酚类、醇类等特征风味物质显著相关。通过分离培养及固态发酵实验探究其风味代谢能力,核心微生物的应用结果表明大曲细菌菌群的生物量及吡嗪类化合物的含量明显提升,改变了大曲的香气组成,进一步证实了其对大曲主体风味的调控功能。该研究在实现大曲风味定向调控、提升白酒品质方面具有重要意义。
基金supported by the National Natural Science Foundation of China(No.51939009)Shenzhen Science and Technology Program(Nos.JCYJ20241202125905008 and GXWD20201231165807007-20200810165349001).
文摘A trace analytical method based on solid-phase extraction gas chromatography-tandem mass spectrometry(SPE–GC–MS/MS)was developed for the rapid detection of 256 semi-volatile organic compounds(SVOCs),including 25 polycyclic aromatic hydrocarbons(PAHs),70 polychlorinated biphenyls(PCBs),123 pesticides,20 phthalate esters(PAEs),4 organophosphate esters(OPEs),9 synthetic musks(SMs),and 5 UV filters(UVs)in water.No-tably,this method provided a decent linearity of calibration standards(R^(2)>0.999),excellent method limits of quantification(MLOQs)(0.12–11.41 ng/L),satisfactory matrix spiking recovery rates(60.4%–126%),and high precision(intra-day relative standard deviations(RSDs):1.0%–10.0%,inter-day RSDs:3.0%–15.0%,and inter-week RSDs:3.4%–15.7%),making it suitable for trace-level studies.Statistical analysis revealed that SVOCs with higher volatility exhibited enhanced recovery rates.Validation of the methodology involved analyzing SVOCs in real spring water and river water samples.Twenty-seven SVOCs were detected in spring water and 58 in river water,with an average concentration of 631.73 and 16,095 ng/L,respectively.Among the detected SVOCs,PAEs constituted the predominant proportion.This study underscored the presence of SVOCs contamination specifi-cally within the spring water,although SVOCs concentrations in river water were significantly greater than those found in spring water.In summary,this sensitive method based on SPE–GC–MS/MS was successfully developed and validated for the rapid analysis of a diverse array of 256 SVOCs at trace levels in water,including not only the traditional highly valued PAHs,PCBs,pesticides,and PAEs,but also the emerging OPEs,UVs,and SMs.
