The isomeric distribution of amino acids produced in γ-radiolytic carboxylation of amines

1977 ◽  
Vol 30 (4) ◽  
pp. 807
Author(s):  
A Davison ◽  
NT Barker ◽  
DF Sangster
Keyword(s):  
Amino Acids ◽  
Hydroxyl Radicals ◽  
Hydrogen Abstraction ◽  
Γ Radiation ◽  
Factors Influencing ◽  
Yield Information ◽  
Isomeric Distribution

Amino acids produced in the γ-radiation-initiated carboxylation of ethylamine, propylamine, isopropylamine, butane-1,4-diamine and pyrrolidine have been characterized. Isomeric distributions of amino acids from each amine have been determined. These distributions reflect the isomeric distribution of amine radicals present, and hence yield information on the initial site of hydrogen abstraction by radiolytically generated hydroxyl radicals. Factors influencing the sites of abstraction are discussed.

γ-Radiation-induced carboxylation of pyrrolidine

1976 ◽  
Vol 29 (12) ◽  
pp. 2603 ◽  
Author(s):  
A Davison ◽  
NT Barker ◽  
DF Sangster
Keyword(s):  
Aqueous Solution ◽  
Amino Acids ◽  
Carboxylic Acid ◽  
Hydroxyl Radicals ◽  
Hydrogen Abstraction ◽  
Major Product ◽  
Amino Group ◽  
Γ Radiation ◽  
Neutral Aqueous Solution ◽  
Radiation Induced

Amino acids produced in the γ-radiation-induced carboxylation of pyrrolidine and formate in neutral aqueous solution have been studied. Two products only were found in the ratio 1 : 5.5. The minor product, proline, and the major product, pyrrolidine-3-carboxylic acid, have been characterized. Their presence indicates that the predominant site of hydrogen abstraction from pyrrolidine by radiation-generated hydroxyl radicals is β to the amino group.

FREE RADICALS OF BIOLOGICAL INTEREST: PART II. ELECTRON SPIN RESONANCE (ESR) SPECTRA OF 2537 A IRRADIATED AMINO ACIDS

1967 ◽  
Vol 45 (12) ◽  
pp. 1831-1839 ◽  
Author(s):  
W. F. Forbes ◽  
P. D. Sullivan
Keyword(s):  
Amino Acids ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Hydrogen Abstraction ◽  
Esr Spectra ◽  
Side Chain ◽  
Biological Interest ◽  
Spin Resonance ◽  
Cyclohexadienyl Radical ◽  
Secondary Radical

Polycrystalline amino acids, when irradiated with 2537 Å light, afford a variety of electron spin resonance signals. These signals are generally stable at room temperature for relatively long periods of time. For a number of the spectra obtained, there is evidence that more than one radical species contributes to the observed spectra. The signals obtained frequently differ from those obtained on exposure to ionizing radiation. The postulated species formed can often be visualized as being formed by effective hydrogen abstraction from the alkyl-substituted tertiary carbon atom or from the —OH, —SH or —NH group contained in the side chain. For L-phenylalanine a secondary radical is obtained, which is ascribed to a cyclohexadienyl radical.

scholarly journals Structural factors influencing the reaction rates of 4-aryloxy-7-nitrobenzofurazans with amino acids

2004 ◽  
Vol 2 (4) ◽  
pp. 672-685 ◽  
Author(s):  
Marioara Bem ◽  
Marilena Vasilescu ◽  
Miron Caproiu ◽  
Constantin Draghici ◽  
Adrian Beteringhe ◽  
...  
Keyword(s):  
Amino Acids ◽  
Room Temperature ◽  
Reaction Rates ◽  
Structural Factors ◽  
Basic Amino Acids ◽  
Interesting Observation ◽  
Neutral Amino Acids ◽  
Acidic Amino Acids ◽  
Factors Influencing ◽  
Snar Reaction

AbstractAn interesting observation was made when studying the SNAr reaction between several 4-aryloxy-7-nitrobenzofurazans (2) and several amino acids leading to the apparition of detectable fluorescence from the substitution products3. Acidic amino acids reacted very slowly=while basic amino acids react fastest with2 having an unsubstituted phenyl or a 4-formyl-phenyl Ar group. Amongst neutral amino acids, proline reacts fastest at room temperature after 100 min. With2 having a methoxy-subtituted Ar group.

Radiolysis of aqueous chloroform solutions

1970 ◽  
Vol 48 (2) ◽  
pp. 271-276 ◽  
Author(s):  
B. J. Rezansoff ◽  
K. J. McCallum ◽  
R. J. Woods
Keyword(s):  
Oxalic Acid ◽  
Formic Acid ◽  
Hydroxyl Radicals ◽  
Ph Effect ◽  
Hydrogen Ions ◽  
Γ Radiation ◽  
High Ph ◽  
Hydrated Electrons ◽  
Presence And Absence ◽  
Ph Range

Saturated aqueous chloroform solutions (0.07 M) with pH ranging from 0.8 to 12.6 have been irradiated with 60Co γ-radiation in the presence and absence of air. G(Cl− + ClO−) increases with increasing pH in the pH range 1–3 (aerated solutions) or 3–6 (deaerated solutions) and again at pH greater than 10.5. The variation in yield from aerated solutions in the region pH 1–3 is attributed to competition between chloroform and hydrogen ions for hydrated electrons. However, such competition cannot account for the pH effect observed in deaerated solutions between pH 3 and 6. Increased yields from both aerated and deaerated solutions at high pH are attributed to the formation of O− by reaction of hydroxyl radicals and hydroxide ions. Formic acid and oxalic acid have been identified as minor products when aerated chloroform solutions are irradiated.

Factors influencing the formation of histaminol, hydroxytyrosol, tyrosol, and tryptophol in wine: Temperature, alcoholic degree, and amino acids concentration

2016 ◽  
Vol 197 ◽  
pp. 1038-1045 ◽  
Author(s):  
M. Bordiga ◽  
C. Lorenzo ◽  
F. Pardo ◽  
M.R. Salinas ◽  
F. Travaglia ◽  
...  
Keyword(s):  
Amino Acids ◽  
Factors Influencing

531. Effects of γ-radiation. Part I. Polymer formation from sugars, hydroxy-acids, and amino-acids

1959 ◽  
Vol 0 (0) ◽  
pp. 2648-2654 ◽  
Author(s):  
S. A. Barker ◽  
P. M. Grant ◽  
M. Stacey ◽  
R. B. Ward
Keyword(s):  
Amino Acids ◽  
Hydroxy Acids ◽  
Γ Radiation ◽  
Polymer Formation

Theoretical Study of the Kinetics of the Hydrogen Abstraction from Methanol. 3. Reaction of Methanol with Hydrogen Atom, Methyl, and Hydroxyl Radicals

1999 ◽  
Vol 103 (19) ◽  
pp. 3750-3765 ◽  
Author(s):  
Jerzy T. Jodkowski ◽  
Marie-Thérèse Rayez ◽  
Jean-Claude Rayez ◽  
Tibor Bérces ◽  
Sándor Dóbé
Keyword(s):  
Hydrogen Atom ◽  
Hydroxyl Radicals ◽  
Theoretical Study ◽  
Hydrogen Abstraction ◽  
Kinetics Of

γ-Radiation-Induced Interactions between Amino Acids and Glucagon

1984 ◽  
Vol 97 (1) ◽  
pp. 36 ◽  
Author(s):  
Lorna K. Mee ◽  
Hie-Joon Kim ◽  
S. James Adelstein ◽  
Irwin A. Taub
Keyword(s):  
Amino Acids ◽  
Γ Radiation ◽  
Radiation Induced
Sign in / Sign up

Export Citation Format

Share Document