6) Auxiliary soft ionization technology: such as FAB, ESI, etc. For example, the m/z of the characteristic ion series of n-alkanes is 15, 29, 43, 57, 71.

3) Reasonable fragments can be lost, and ion peaks with reasonable mass numbers appear, such as M-1, M-15, M-18, M-28, M-44, etc. Soft ionization techniques usually give cluster ion peaks such as M + 1, M + 18 (H2O), M + 70 (substrate glycerol), which are very useful for identifying molecular ion peaks. General process of inferring molecular structure.

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Check whether the standard mass spectrum of the compound is the same as the unknown spectrum; C. Find the standard sample and get the mass spectrum of the standard sample, and then compare it with the spectrum of the unknown. In the stick diagram showing the mass spectrum of pentane, the line produced by the heaviest ion passing through the machine (at m/z = 72) is due to the molecular ion.The tallest line in the stick diagram (in this case at m/z = 43) is called the base peak.This is usually given an arbitrary height of 100, and the height of everything else is measured relative to this. Mass Spectrometry, 2017: 23. 2.

Your email address will not be published. WANG Jing-Zun. When there are multiple chlorine and bromine atoms, a series of strength peaks such as A + 2, A + 4, A + 6 can appear. %PDF-1.3 (7) Verify the results. y��*b���.�{���B8-�Wi��X�uf^�'���j�!���V�w�;3x�f�0�m�}e7m��. The mass number of the mass spectrum fragments containing nitrogen atoms or even nitrogen atoms must be odd. Figure from McCallum et al, 1998. �����I�T�twS,���X�M�vz�uʵ-#������#f}8~�B����:�����aq*�����1G���A�mt9om:�H�. The high-mass terminal ion peak of mass spectrum is caused by the loss of molecular ion fragments.

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(2) Derive the chemical formula of the compound based on the high-resolution data of molecular ion peaks. (4) Study of high-mass terminal ion peaks. Sialic Acid Identification and Quantitation, Comparison of Biosimilars and Protein Therapeutics, Gas Chromatography (GC) Based Analysis Services, Liquid Chromatography (LC) Based Analysis Services, High Performance Liquid Chromatography (HPLC) based Analysis Service, Ultra Performance Liquid Chromatography (UPLC) Based Analysis Service, Gel Permeation Chromatography based analysis Service, Gel Permeation Chromatography (GPC) and Size Exclusion Chromatography (SEC) based analysis Service, Nuclear Magnetic Resonance Spectroscopy (NMR) based Polymers Analysis, High Performance Thin Layer Chromatography (HPTLC) based analysis Service, Quickly Understand Anthocyanins and Their Analysis Methods, Methods to Detect Host Cell Proteins in Biopharmaceutical, Introduction on Extraction and Analysis of Polyphenols, Two Soft Ionization Techniques—EI and MALDI, Qualitative and Quantitative Analyses for Protein Glycosylation, The Fourth Reverse Phases Protein Array Workshop in Paris, How to Detect the Intracellular Protein Phosphorylation. How to Interpret EI-MS Spectra. ... All organic molecules have different mass spectra, owing to varying fragmentation, allowing analysis of them to help identify them. Mass Spectrometry: Interpretation; NIST's Webbook which includes IR, UV-vis and Mass Spectra of many organic compounds; AIST's Spectral Database, which includes 1 H and 13 C NMR spectra, as well as IR, UV-vis, and Mass Spectra.

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