高效液相色谱-四极杆/静电场轨道阱高分辨质谱法测定血清中胆固醇及其6种代谢标志物

利用高效液相色谱-四极杆/静电场轨道阱高分辨质谱(HPLC-Q/OrbitrapHRMS)测定血清中的胆固醇及其6种代谢标志物(2,4-脱氢胆甾醇、7-烯胆甾醇、菜油固醇、豆固醇、β-谷固醇和角鲨烯)。以乙腈作为提取溶剂,超声提取,采用Acquity UPLC BEH C18色谱柱(100 mm×2. 1 mm,1. 7μm),以95%(v/v)的甲醇-乙腈(2∶8,v/v)-5%(v/v)水做流动相,等度洗脱15 min,流速0. 4 mL/min。在大气压化学电离源(APCI)正离子扫描模式下,质谱采用全扫描/数据依赖二级扫描(Full MS/dd MS2)监测模式,同时获得定性和定量结果,一级分辨率为70 000FWHM,二级分辨率为17 500 FWHM。7种目标物质在其线性范围内的线性相关系数(r2)均不小于0. 992,检出限为0. 8~62. 1μg/L,3个加标水平下的回收率为82. 1%~97. 5%,相对标准偏差(RSD)为1. 6%~7. 4%。方法准确、简单、快捷,可以作为血清中胆固醇及其6种代谢标志物的检测方法。

Synthesis of ZSM-5 monoliths with hierarchical porosity through a steam-assisted crystallization method using sponges as scaffolds

Self‐supporting ZSM‐5crystals with hierarchical porosity were prepared through a steam‐assisted crystallization method using sponges as rigid scaffolds.The synthesized materials were characterized by X‐ray diffraction,nitrogen sorption,scanning electron microscopy,transmission electron microscopy,solid‐state nuclear magnetic resonance spectroscopy and ammonia temperature‐programmed desorption.The ZSM‐5monoliths exhibited high crystallinities,hierarchical porous structures and strong acidities.They showed superior catalytic performance in the liquid‐phase esterification reaction between benzyl alcohol and hexanoic acid.

药酒中乌头碱、次乌头碱、新乌头碱的LC／MS／MS分析

目的应用高效液相色谱-质谱联用法对涉案药酒中有毒成分乌头碱、次乌头碱、新乌头碱快速定量分析。方法样品过膜后用乙腈稀释500倍,使用Waters ACQUITY UPLC BEN C18(100 mm×2.1 mm,1.7μm)色谱柱,以乙腈-10 mmol/L碳酸氢铵溶液(pH=10)为流动相梯度洗脱,多反应监测模式下测定涉案药酒中乌头生物碱的含量。设定方法下乌头碱、次乌头碱、新乌头碱的保留时间分别为5.10 min、5.64 min、4.58 min,用于定量分析的离子对(m/z)分别为646.6-586.6、616.6-556.6、632.7-572.6。在1~200 ng/mL内,乌头碱线性回归方程为Y=343.8X+38901(R2=0.9995);在100~1000 ng/mL内,次乌头碱线性回归方程为Y=3.817X-357.579(R2=0.9991);在0.5~10 ng/mL内,新乌头碱线性回归方程为Y=719.562X+128.748(R^2=0.9995)。用此方法检测出涉案药酒中乌头碱、次乌头碱、新乌头碱含量分别为71.85,415.86,1.49μg/mL。结论建立的高效液相色谱-质谱法可用于药酒中乌头碱、次乌头碱、新乌头碱的快速测定。