麦冬硫磺熏蒸高异黄酮类成分结构鉴定超高效液相色谱法高分辨质谱法为了阐明麦冬高异黄酮类成分在硫磺熏蒸过程中的变化,本文采用UHPLC-LTQ-Orbitrap高分辨质谱,在ESI离子源负离子扫描模式对样品进行分析.最终从硫磺熏蒸麦冬药材中筛选了41个高异黄酮含硫衍生物,并对其中的31个进行了结构鉴定,包括16个硫酸酯和15个亚硫酸...
蒸发光检测器和电喷雾质谱(esi-ms)测定伊曲康唑注射液中泊洛沙姆188含量,前者定量下限为25μg/ml,线性范围窄;后者采用选择离子监测模式,以最强峰m/z976.4作为泊洛沙姆188定量的跟踪离子,由于泊洛沙姆的分子量不唯一且呈正态分布,在esi电离模式下带多电荷,因此,仅仅选择某个特定的离子进行分析会丢失很多其他离子...
ESI+ full scanning was carried out with electrospray ion source scanning range was mass-charge ratio(m/z)100-1 500 with spray voltage of 3.8 kV,metal capillary temperature of 320 ℃,sheath gas pressure of 60 Arb,auxiliary gas pressure of 10 Arb,spray temperature of 280 ℃. RESULTS:Under ...
蒸发光检测器和电喷雾质谱(ESI-MS)测 定伊曲康唑注射液中泊洛沙姆188含量,前者定量下限为25μg/mL, 线性范围窄;后者采用选择离子监测模式,以最强峰m/z 976.4作为泊 洛沙姆188定量的跟踪离子,由于泊洛沙姆的分子量不唯一且呈正态 分布,在ESI电离模式下带多电荷,因此,仅仅选择某个特定的离子 进行分析会丢失...
Quantitative analysis of 4β- and 4α‑hydroxycholesterol in human plasma and serum by UHPLC/ESI-HR-MS 4βOHC and 4αOHC and also internal standard d74βOHC were monitored using HR-MS as sodium adducts, which could not be used as a precursor ions in... H Hautajärvi,J Hukkanen,...
LC-ESI-MS-QTOFTargeted/untargeted data acquisitionStimulantsCathinonesMetabolite identificationThe development of a liquid chromatography high-resolution mass spectrometry quadrupole-time-of-flight (LC-HRMS-QTOF) method for the analysis of new stimulant designer drugs (e.g. phenethylamine, amphetamine, ...
swiohnicinhjuwraysianlsthoeombsoeursveedbyininivscohkeinmgicoxreidpaetrifvuessiotrnesisnj[u5r2y].iOn ntheeomf ouse the oxbidyaitnivveoksitnregssoxbiidoamtiavrekestrrse[s5s3[–5525]].,Othnee1o3fCthiseootoxpidoamtievressotfreLs-scybsioteminaer-kgelrusta[5th3i–o5n5e],dthiseu1l3fiCdiesowt...
FlavonoidsChlorophora regiaHRESI–MS/MSMoraceaeRetro Diels–Alder.Aims: This study was undertaken to characterize flavonoids from the stem bark of Chlorophora regia based on their HRESI–MS/MS fragmentation pattern in positive mode. Study Design: Isolation and identification of flavonoids from the ...
To assess the practical implications, an extract of tea sample was analyzed and screened using the developed library, which resulted in the identification of three common flavonoids based on their HR-ESI-MS/MS spectral features. The established LC-HR-MS/MS method can be used for the targeted ...
The HPLC-PDA-ESI-MS/MS-LC/HR-ESI-MS technique allowed to the identification of 13 phenolic compounds and showed that protocatechuic acid is the major constituent of the plant leaves grown in Tabarka, Ain Draham and Testour. The SOLAE of the plant grown in Tabarka presents the most potent ...