A method for the identification of unknown compounds based on a novel Retention Index System comprising having a TAGs homologous series, wherein such identification is performed by means of liquid chromatography (LC), or liquid chromatography coupled with mass spectrometry (LC-MS) is disclosed.Luigi...
After the acquisition, the two MS/MS spectra of unknown and mass calibrator are combined, and the fragments of the unknown are lock mass corrected by using the protonated molecule of the mass calibrator. To prove this concept, 10 compounds were analyzed using this approach, the fragments ...
Mass spectrometry has become the analytical method of choice in metabolomics research. The identification of unknown compounds is the main bottleneck. In addition to the precursor mass, tandem MS spectra carry informative fragment peaks, but the coverage of spectral libraries of measured reference compou...
In many cases, an unknown to an investigator is actually known in the chemical literature. We refer to these types of compounds as "known unknowns." Chemical Abstracts Service (CAS) Registry is a particularly good source of these substances as it contains over 54 million entries. Accurate mass...
For the structural characterization of the photolytic degradant of metronidazole, liquid chromatography with tandem mass spectrometry (LC–MS) was applied at first stage due to its high selectivity and sensitivity in the qualification of unknown compounds12,13,14,15,16,17,18. Further structural confi...
When considering the number of known compounds in public databases, the availability of library MS/MS spectra is quite limited2,10. Open spectral libraries such as MassBank (https://massbank.eu/MassBank/)11, MoNA (http://mona.fiehnlab.ucdavis.edu/), METLIN12, and mzCloud (https://www.mzc...
The ability of forensic laboratories to detect and identify unknown compounds is highly important since new, non-controlled designer drugs are appearing on the market with increasing frequency. In this study, the combined use of gas chromatography-mass spectrometry (GC-MS) and ultra performance liquid...
Wong,C Kenneth - 《Journal of Chemical Education》 被引量: 0发表: 2015年 Spectrometric identification of organic compounds Presents a sequence of procedures for identifying an unknown organic liquid using mass, NMR, IR, and UV spectroscopy, along with specific examples of unkno... RM Silverstein...
At the same time, 7 kinds unknown compounds were detected from Populus ussuriensis Kom., which appeared at 9.02, 9.7, 20.6, 25.03, 28.82, 32.88, and 34.58 minutes, with the odor of sweet, plastic&spicy, special, stimulating& burning&plastic&spicy, stinky, plastic&spicy and plastic, ...
In this study we assess its antibacterial activity against plant-pathogenic bacteria and identify its unknown antibiotics. The bacterial culture broth had significant antibacterial activity that increased with development of the bacteria and reached its maximum at the stationary growth phase. The antibiotic...