Chemical effects of ultrasound on aqueous solutions. Formation of hydroxyl radicals and hydrogen atoms

1983 ◽  
Vol 87 (8) ◽  
pp. 1369-1377 ◽  
Author(s):  
Keisuke Makino ◽  
Magdi M. Mossoba ◽  
Peter Riesz
Keyword(s):  
Aqueous Solutions ◽  
Hydroxyl Radicals ◽  
Hydrogen Atoms ◽  
Chemical Effects

Electron spin resonance of spin-trapped radicals of amines and polyamines. Hydroxyl radical reactions in aqueous solutions and γ-radiolysis in the solid state

1982 ◽  
Vol 60 (12) ◽  
pp. 1493-1500 ◽  
Author(s):  
Magdi M. Mossoba ◽  
Ionel Rosenthal ◽  
Peter Riesz
Keyword(s):  
Aqueous Solutions ◽  
Hydroxyl Radicals ◽  
Room Temperature ◽  
Spin Trap ◽  
Alkyl Chain ◽  
Spin Trapping ◽  
Radical Reactions ◽  
Hydrogen Atoms ◽  
Protonated Amino Group ◽  
Spin Resonance

The reactions of hydroxyl radicals with methylamine, dimethylamine, trimethylamine, diethylamine, sec-butylamine, ethylenediamine, 1,3-diaminopropane, putrescine, cadaverine, 1,7-diaminoheptane, ornithine, spermidine, spermine, agmatine, and arcaine in aqueous solutions have been investigated by spin-trapping and esr. Hydroxyl radicals were generated by the uv photolysis of H2O2 and 2-methyl-2-nitrosopropane (MNP) was used as the spin-trap. The effects of ionizing radiation on the same polyamines in the polycrystalline state were also investigated. The free radicals produced by γ-radiolysis of these solids at room temperature in the absence of air were identified by dissolution in aqueous solutions of MNP. The predominant reaction of [Formula: see text] with amines and polyamines below pH 7 was the abstraction of hydrogen atoms from a carbon that is not adjacent to the protonated amino group. For agmatine and arcaine which contain guanidinium groups abstraction occurred from the α-CH. Dimethylamine was oxidized to the dimethylnitroxyl radical by H2O2 in the dark. γ-Radiolysis of polyamines in the polycrystalline state generated radicals due to H-abstraction from either the α-CH or from a carbon atom in the middle of the alkyl chain. The deamination radical was obtained from ornithine.

Chemical effects in negative muon capture in some ionic and covalent solids and ionic aqueous solutions

1976 ◽  
Vol 13 (1) ◽  
pp. 43-53 ◽  
Author(s):  
J. D. Knight ◽  
C. J. Orth ◽  
M. E. Schillaci ◽  
R. A. Naumann ◽  
H. Daniel ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Muon Capture ◽  
Negative Muon ◽  
Chemical Effects

Rate constants for reaction of hydrogen atoms in aqueous solutions

1971 ◽  
Vol 75 (4) ◽  
pp. 449-454 ◽  
Author(s):  
Robert H. Schuler ◽  
Pedatsur Neta ◽  
G. R. Holdren
Keyword(s):  
Aqueous Solutions ◽  
Rate Constants ◽  
Hydrogen Atoms

Reactions of hydrogen atoms in aqueous solutions. Some amino acids

1968 ◽  
Vol 72 (10) ◽  
pp. 3394-3400 ◽  
Author(s):  
Wynn A. Volkert ◽  
Robert R. Kuntz
Keyword(s):  
Amino Acids ◽  
Aqueous Solutions ◽  
Hydrogen Atoms
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