Effect of organic peroxides on the morphology and properties of EVA/Cloisite 15A nanocomposites

2009 ◽  
Vol 112 (1) ◽  
pp. 218-225 ◽  
Author(s):  
S. B. Mishra ◽  
A. S. Luyt
Keyword(s):  
Organic Peroxides ◽  
Cloisite 15A

scholarly journals Light-Induced Byproducts of Vitamin C in Multivitamin Solutions

2004 ◽  
Vol 50 (1) ◽  
pp. 135-140 ◽  
Author(s):  
Jean-Claude Lavoie ◽  
Philippe Chessex ◽  
Thérèse Rouleau ◽  
Diane Migneault ◽  
Blandine Comte
Keyword(s):  
Mass Spectrometry ◽  
Ascorbic Acid ◽  
Vitamin C ◽  
Organic Peroxides ◽  
Ambient Light ◽  
Rapid Loss ◽  
Biological Importance ◽  
Before And After

Abstract Background: When solutions of multivitamin preparations (MVPs) are exposed to light, H2O2 as well as organic peroxides are generated and the concentration of vitamin C decreases. The aim of this study was to determine, using mass spectrometry, whether the generation of oxidative byproducts of vitamin C, such as dehydroascorbate (DHA) and 2,3-diketogulonic acid (DKG), accounted for the reported decrease in ascorbic acid in MVPs exposed to light. Methods: Mass spectrometry was used to document the formation of byproducts of ascorbic acid in solutions containing a MVP, vitamin C + riboflavin, and vitamin C + H2O2 + Fe2+. The involvement of ascorbic acid and H2O2 in the formation of organic peroxides was tested by measuring peroxide concentrations in solutions containing H2O2 with or without ascorbic acid and with or without Fe2+ before and after addition of catalase. Results: The loss of ascorbic acid in photo-exposed MVPs was associated with the concomitant generation of byproducts different from DHA and DKG. Among them, one mass fingerprint was particularly observed with solutions of vitamin C + riboflavin exposed to ambient light as well as with the solution of vitamin C + H2O2 + Fe2+, suggesting a Fenton-like reaction. This fingerprint was associated with the formation of catalase-resistant peroxides. Conclusion: Exposure of MVPs to light leads to the rapid loss of ascorbic acid and generation of specific byproducts that differ from DHA and DKG. The conversion of vitamin C into byproducts could be of biological importance in accounting for the decrease in ascorbic acid concentrations and the generation of organic peroxides in light-exposed MVPs.

scholarly journals Decomposition of Organic Peroxides

Nature ◽  
1938 ◽  
Vol 141 (3567) ◽  
pp. 472-472 ◽  
Author(s):  
E. J. HARRIS ◽  
A. C. EGERTON
Keyword(s):  
Organic Peroxides ◽  
Decomposition Of Organic Peroxides

Correction to “Determination of H2O2and organic peroxides in cloud- and rain-water on the Kleiner feldberg during FELDEX”

1997 ◽  
Vol 24 (7) ◽  
pp. 827-827 ◽  
Author(s):  
F. Sauer ◽  
G. Schuster ◽  
C. Schäfer ◽  
G. K. Moortgat
Keyword(s):  
Rain Water ◽  
Organic Peroxides ◽  
Kleiner Feldberg
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