Microstructure of Bacterial Poly(β-Hydroxybutyrate-co-β-Hydroxyvalerate) by Fast Atom Bombardment Mass Spectrometry Analysis of Their Partial Degradation Products

1990 ◽  
pp. 49-64 ◽  
Author(s):  
A. Ballistreri ◽  
D. Garozzo ◽  
M. Giuffrida ◽  
G. Montaudo
Keyword(s):  
Mass Spectrometry ◽  
Fast Atom Bombardment ◽  
Degradation Products ◽  
Mass Spectrometry Analysis ◽  
Spectrometry Analysis ◽  
Partial Degradation

scholarly journals Proton NMR and fast-atom bombardment mass spectrometry analysis of the melanoma-associated ganglioside 9-O-acetyl-GD3.

1985 ◽  
Vol 260 (27) ◽  
pp. 14556-14563 ◽  
Author(s):  
J Thurin ◽  
M Herlyn ◽  
O Hindsgaul ◽  
N Strömberg ◽  
K A Karlsson ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Fast Atom Bombardment ◽  
Proton Nmr ◽  
Mass Spectrometry Analysis ◽  
Spectrometry Analysis

scholarly journals Online capillary electrophoresis – mass spectrometry analysis of histatin-5 and its degradation products

The Analyst ◽  
2020 ◽  
Vol 145 (14) ◽  
pp. 4787-4794
Author(s):  
Jared Lamp ◽  
Svetlana P. Ikonomova ◽  
Amy J. Karlsson ◽  
Qiangwei Xia ◽  
Yan Wang
Keyword(s):  
Mass Spectrometry ◽  
Capillary Electrophoresis ◽  
Degradation Products ◽  
Mass Spectrometry Analysis ◽  
Histatin 5 ◽  
Spectrometry Analysis ◽  
Salivary Peptide ◽  
Antibacterial And Antifungal Activities ◽  
Antibacterial And Antifungal ◽  
Capillary Electrophoresis Mass Spectrometry

Histatin-5 (Hst-5) is a human salivary peptide with antibacterial and antifungal activities. A novel capillary electrophoresis – mass spectrometry (CE-MS) method is developed to address issues related to highly basic and cationic nature of Hst-5.

scholarly journals Investigation of forced and total degradation products of amlodipine besylate by liquid chromatography and liquid chromatography-mass spectrometry

2014 ◽  
Vol 20 (2) ◽  
pp. 295-304 ◽  
Author(s):  
Zora Stoiljkovic ◽  
Milka Jadranin ◽  
Svetlana Djuric ◽  
Slobodan Petrovic ◽  
Avramov Ivic ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Degradation Products ◽  
Chemical Oxidation ◽  
Reversed Phase ◽  
Mass Spectrometry Analysis ◽  
Molecular Formula ◽  
Electrochemical Degradation ◽  
Amlodipine Besylate ◽  
Spectrometry Analysis

An isocratic, reversed-phase liquid chromatographic method was applied for the investigation of the degradation products of amlodipine besylate under the stressed conditions in solution. Amlodipine besylate stock solutions were subjected to acid and alkali hydrolysis, chemical oxidation and photodegradation as well as to the electrochemical degradation by cyclic voltammetry in 0.05 mol/L NaHCO3 on gold electrode. The total degradation of amlodipine besylate was achieved in 5 mol/L NaOH at 80?C for 6 h and the compound with molecular formula C15H16NOCl was identified as a main degradation product. Under acidic (5 mol/L HCl at 80?C for 6 h) stress conditions 75.2% of amlodipine besylate degradation was recorded. Oxidative degradation in the solution of 3% H2O2-methanol 80:20 at 80?C for 6 h showed that amlodipine besylate degraded to 80.1%. After 14 days of expose in photostability chamber amlodipine besylate solution showed degradation of 32.2%. In electrochemical degradation after 9 hours of cyclization the beginning of amlodipine oxidation was shifted for 200 mV to more negative potentials, with the degradation of 66.5%. Mass spectrometry analysis confirmed the presence of dehydro amlodipine derivate with molecular formula C20H23N2O5Cl in oxidative and acidic conditions while in electrochemical degradation was detected in traces.

scholarly journals Mass Spectrometry Analysis of NMC622/Graphite Li-Ion Cells Electrolyte Degradation Products after Storage and Cycling

2021 ◽  
Author(s):  
Rigaud Sébastien ◽  
Ana Cristina Martinez Maciel ◽  
Tristan Lombard ◽  
Sylvie Grugeon ◽  
Pierre Tran-Van ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Degradation Products ◽  
Principal Component ◽  
Mass Spectrometry Data ◽  
Mass Spectrometry Analysis ◽  
Statistical Tool ◽  
Decomposition Products ◽  
Spectrometry Analysis ◽  
Li Ion ◽  
Triton X

Abstract With the aim of establishing a data simultaneous comparison, the Principal Component Analysis (PCA) statistical tool was applied to LiNi0.6Mn0.2Co0.2O2/graphite Li-ion cells electrolyte’s decomposition products detected by UHPLC-ESI-HRMS. Herein, we illustrate how the chemometric tool associated with mass spectrometry data can be relevant to provide information about the presence of unusual molecules. Indeed, pristine Triton X-100 surfactant molecules used in electrode elaboration process were detected after impregnation stage. However, as they chemically react and oxidize at a potential lower than 4.5V vs. Li/Li+, only surfactant derivatives and classical ageing molecules were observed, respectively, after storage and cycling stages at 55°C, leading to a triangle-type correlation circle. On the other hand, global schemes of LiPF6-based electrolyte degradation pathways were elaborated from a comparative study with literature to help interpret results in future electrolyte ageing studies.

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