Speciation of trace elements in proteins in human and bovine serum by size exclusion chromatography and inductively coupled plasma-mass spectrometry with a magnetic sector mass spectrometer

1999 ◽  
Vol 4 (5) ◽  
pp. 546-553 ◽  
Author(s):  
J. Wang ◽  
R. S. Houk ◽  
Dawn Dreessen ◽  
D. R. Wiederin
Keyword(s):  
Mass Spectrometry ◽  
Trace Elements ◽  
Bovine Serum ◽  
Inductively Coupled Plasma ◽  
Size Exclusion ◽  
Inductively Coupled ◽  
Exclusion Chromatography ◽  
Sector Mass Spectrometer ◽  
Plasma Mass Spectrometry ◽  
Magnetic Sector Mass Spectrometer

scholarly journals Role of Organo-Modifier and Metal Impurities of Commercial Nanoclays in the Photo- and Thermo-Oxidation of Polyamide 11 Nanocomposites

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1034
Author(s):  
Martina Ussia ◽  
Giusy Curcuruto ◽  
Daniela Zampino ◽  
Nadka Tzankova Dintcheva ◽  
Giovanni Filippone ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Inductively Coupled Plasma ◽  
Oxidative Degradation ◽  
Point Of View ◽  
Size Exclusion ◽  
Polyamide 11 ◽  
Inductively Coupled ◽  
Flight Mass Spectrometry ◽  
Exclusion Chromatography ◽  
Plasma Mass Spectrometry

The photo-oxidative degradation processes of bio-based PA11 nanocomposites containing montmorillonite (MMT) and the organo-modified Cloisite®30B were investigated to discriminate the influence of organo-modified components on the polymer durability. Indeed, despite the extensive studies reported, there are still ambiguous points to be clarified from the chemical point of view. To this aim, UV-aged materials were analyzed by Size Exclusion Chromatography (SEC), Inductively Coupled Plasma–Mass Spectrometry (ICP-MS) and Matrix-Assisted Laser Desorption Ionization Time-of-Flight Mass Spectrometry (MALDI-TOF MS). This enabled determining changes in both chemical structure and Molar Masses (MMs) induced by light, heat and oxygen exposure. The addition of organo-modified nanoclays strongly affected the PA11 light durability, triggering the macromolecular chains scission due to the typical αH, Norrish I and II mechanisms. However, the main contribution in boosting the photo-oxidative degradation is induced by iron impurities contained into the clays. Conversely, thermo-oxidation process performed at 215 °C was unambiguously affected by the presence of the organo-modifiers, whose presence determined an enhancement of crosslinking reactions.

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