Special Features of Stable Free Radical Formation on Plasma-irradiated α-D-Glucose Studied by ESR Spin-Trapping Technique

1988 ◽  
Vol 17 (10) ◽  
pp. 1671-1674 ◽  
Author(s):  
Masayuki Kuzuya ◽  
Kaei Washino ◽  
Akihiro Noguchi ◽  
Akiko Ito
Keyword(s):  
Free Radical ◽  
Spin Trapping ◽  
Radical Formation ◽  
Stable Free Radical ◽  
Esr Spin Trapping ◽  
Free Radical Formation ◽  
Spin Trapping Technique

Studies on photofading and stable free radical formation in reactive dyed cellulosic systems under their exposure to light

1996 ◽  
Vol 47 (3) ◽  
pp. 461-463 ◽  
Author(s):  
Edit Rémi ◽  
Olga Horváth ◽  
András Víg ◽  
Antal Rockenbauer ◽  
László Korecz ◽  
...  
Keyword(s):  
Free Radical ◽  
Radical Formation ◽  
Stable Free Radical ◽  
Free Radical Formation

scholarly journals Synthesis of Fluorescent Dansyl Derivatives of Methoxyamine and Diphenylhydrazine as Free Radical Precursors

2020 ◽  
Vol 21 (10) ◽  
pp. 3559
Author(s):  
Bianca Patrascu ◽  
Sorin Mocanu ◽  
Anca Coman ◽  
Augustin M. Madalan ◽  
Codruta Popescu ◽  
...  
Keyword(s):  
Free Radical ◽  
Esr Spectroscopy ◽  
Spin Trapping ◽  
X Ray ◽  
Esr Spin Trapping ◽  
Dansyl Derivatives ◽  
Methoxy Radical ◽  
Derivatives Of ◽  
Fluorescent Derivatives ◽  
Spin Trapping Technique

Starting from dansyl-chloride, in reaction with 1,1-diphenylhydrazine and methoxyamine, two new fluorescent derivatives 1 and 2 were obtained and characterized by NMR, IR, UV-Vis, HR-MS, and fluorescence spectroscopy. The single-crystal X-ray structure was obtained for compound 2. Both compounds generate free radicals by oxidation, as demonstrated by ESR spectroscopy. Compound 1 generates the corresponding hydrazyl-persistent free radical, evidenced directly by ESR spectroscopy, while compound 2 generates in the first instance the methoxyaminyl short-lived free radical, which decomposes rapidly with the formation of the methoxy radical, evidenced by the ESR spin-trapping technique. By oxidation of compounds 1 and 2, their fluorescence is quenched.

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