نتایج جستجو برای: q tof ms
تعداد نتایج: 251600 فیلتر نتایج به سال:
To reveal the structural stabilities and transformation mechanism of rhynchophylline (RIN) and isorhynchophylline (IRN), HPLC and UPLC-Q-TOF-MS method were developed for the qualitative and quantitative analysis of the conversion rate. The method was validated for linearity, inter- and intra-day precisions, repeatability and stability. All the quantitative determination method validation result...
A method was established for the determination of 18 flavonoids in tea by ultra-performance liquid chromatography coupled with quadrupole/time-of-flight mass spectrometry (UPLC-Q-TOF/MS). The samples were extracted 70% (V/V) methanol aqueous solution, and separation achieved on a Kinetex F5 column (2.1 mm × 100 mm, 2.6 μm) 0.1% formic acid water as mobile phase gradient elution. detected TOF/MS...
Pyrrolizidine alkaloids (PAs) and their N-oxides (PANOs) have serious hepatotoxic effects in both humans and animals, necessitating a method capable of detecting, characterizing, and quantifying them using a robust assay. While triple quadrupole LC/MS systems are ideal for targeted detection, targeted analysis requires standards that are not always easily obtained. Only a fraction of known natu...
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