近年来,无需复杂样品前处理、且在开放环境下实现离子化的常压敞开式离子化质谱技术(Ambientionization mass spectrometry,AI-MS)的研制与应用成为质谱学领域的前沿及备受关注的研究方向。该文综述了AI离子源的基本原理、特征与应用进...近年来,无需复杂样品前处理、且在开放环境下实现离子化的常压敞开式离子化质谱技术(Ambientionization mass spectrometry,AI-MS)的研制与应用成为质谱学领域的前沿及备受关注的研究方向。该文综述了AI离子源的基本原理、特征与应用进展,并结合笔者研制的空气动力辅助离子化(Air flow assisted ioniza-tion,AFAI)技术,介绍了气流辅助常压敞开式离子化技术的基本特点及其应用。展望了常压敞开式离子化技术的发展趋势。展开更多
采用紫外光谱定性定量分析野生植物茅莓主要有效成分黄酮化合物,并对其进行液相色谱-电喷雾质谱联用、薄层色谱原位表面增强拉曼散射研究。液相色谱流动相A:CH3OH,B:H2O+1%乙酸,液相色谱流出时间16.21 m in的化合物为六羟基双氢黄酮醇...采用紫外光谱定性定量分析野生植物茅莓主要有效成分黄酮化合物,并对其进行液相色谱-电喷雾质谱联用、薄层色谱原位表面增强拉曼散射研究。液相色谱流动相A:CH3OH,B:H2O+1%乙酸,液相色谱流出时间16.21 m in的化合物为六羟基双氢黄酮醇二聚体形式,分子量640,占总黄酮的91.71%;流出时间19.61 m in的化合物分子量448,为槲皮甙,占总黄酮的8.29%。茅莓总黄酮经聚酰胺薄层色谱板分离,获得两个斑点:R f1=0.14,R f2=0.47;分别制备灰银胶和溴化银光致还原银溶胶表面增强基底,在样品薄层色谱两个斑点原位分别获得2种黄酮化合物的表面增强拉曼光谱,在2种表面增强基底作用下,都能观察到μg量黄酮化合物特征拉曼光谱,并比较了2种色谱分离与指纹检测联用技术。展开更多
The fragmentation behavior of six known flavonoids from Meconopsis Maxim were studied by electrospray ionization tandem mass spectrometry (ESI-MS^n). Besides the structure of aglycones and hydroxyl group on it, the po...The fragmentation behavior of six known flavonoids from Meconopsis Maxim were studied by electrospray ionization tandem mass spectrometry (ESI-MS^n). Besides the structure of aglycones and hydroxyl group on it, the position of the sugar substitution also affected the fragmentation of the flavonoids. The diagnostic fragmentations of flavonoids and aglycones were obtained in the positive and negative ion ESI-MS^n experiments, and the fragmentation pathways were discussed.展开更多
文摘采用紫外光谱定性定量分析野生植物茅莓主要有效成分黄酮化合物,并对其进行液相色谱-电喷雾质谱联用、薄层色谱原位表面增强拉曼散射研究。液相色谱流动相A:CH3OH,B:H2O+1%乙酸,液相色谱流出时间16.21 m in的化合物为六羟基双氢黄酮醇二聚体形式,分子量640,占总黄酮的91.71%;流出时间19.61 m in的化合物分子量448,为槲皮甙,占总黄酮的8.29%。茅莓总黄酮经聚酰胺薄层色谱板分离,获得两个斑点:R f1=0.14,R f2=0.47;分别制备灰银胶和溴化银光致还原银溶胶表面增强基底,在样品薄层色谱两个斑点原位分别获得2种黄酮化合物的表面增强拉曼光谱,在2种表面增强基底作用下,都能观察到μg量黄酮化合物特征拉曼光谱,并比较了2种色谱分离与指纹检测联用技术。
文摘The fragmentation behavior of six known flavonoids from Meconopsis Maxim were studied by electrospray ionization tandem mass spectrometry (ESI-MS^n). Besides the structure of aglycones and hydroxyl group on it, the position of the sugar substitution also affected the fragmentation of the flavonoids. The diagnostic fragmentations of flavonoids and aglycones were obtained in the positive and negative ion ESI-MS^n experiments, and the fragmentation pathways were discussed.