Formation of free radicals in food constituents by γ-irradiation

1990 ◽  
Vol 62 (2) ◽  
pp. 307-310 ◽  
Author(s):  
A. R. Forrester ◽  
D. B. McKay
Keyword(s):  
Free Radicals ◽  
Γ Irradiation

Free radicals in velvet bean seeds (Mucuna pruriens L. DC.) and their status after γ-irradiation and conventional processing

LWT ◽  
2007 ◽  
Vol 40 (9) ◽  
pp. 1570-1577 ◽  
Author(s):  
Rajeev Bhat ◽  
Kandikere R. Sridhar ◽  
Brij Bhushan
Keyword(s):  
Free Radicals ◽  
Mucuna Pruriens ◽  
Velvet Bean ◽  
Γ Irradiation

scholarly journals Effect of 5-trans isomer of arachidonic acid on model liposomal membranes studied by a combined simulation and experimental approach

2018 ◽  
Author(s):  
Ioanna Tremi ◽  
Dimitrios Anagnostopoulos ◽  
Ellas Spyratou ◽  
Paraskevi Gkeka ◽  
Alexandros G. Georgakilas ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Arachidonic Acid ◽  
Free Radicals ◽  
Lipid Bilayers ◽  
Unsaturated Fatty Acids ◽  
Md Simulations ◽  
Γ Irradiation ◽  
Physiological Concentration ◽  
Increased Risk ◽  
Average Size

AbstractUnsaturated fatty acids are found in humans predominantly in the cis configuration. Fatty acids in the trans configuration are primarily the result of human processing (trans fats), but can also be formed endogenously by radical stress. The cis-trans isomerization of fatty acids by free radicals could be connected to several pathologies. Trans fats have been linked to an increased risk of coronary artery disease; however, the reasons for the resulting pathogenesis remain unclear. Here, we investigate the effect of a mono trans isomer of arachidonic acid (C20:4-5trans,8cis,11cis,14cis) produced by free radicals in physiological concentration on a model erythrocyte membrane using a combined experimental and theoretical approach. Molecular Dynamics (MD) simulations of two model lipid bilayers containing arachidonic acid and its 5-trans isomer in 3% mol. were carried out for this purpose. The 5-trans isomer formation in the phospholipids was catalyzed by HOCH2CH2S• radicals, generated from the corresponding thiol by γ-irradiation, in multilamellar vesicles (MLVs) of SAPC. Large unilamellar vesicles were made by the extrusion method (LUVET) as a biomimetic model for cis-trans isomerization. Atomic Force Microscopy and Dynamic Light Scattering were used to measure the average size, morphology, and the z-potential of the liposomes. Both results from MD simulations and experiments are in agreement and indicate that the two model membranes display different physicochemical properties in that the bilayers containing the trans fatty acids were more ordered and more rigid than those containing solely the cis arachidonic acid. Correspondingly, the average size of the liposomes containing trans isomers was smaller than the ones without.

scholarly journals Free Radical Chemistry of White Phosphorus: γ-Irradiation of P4 in Bromoform

1968 ◽  
Vol 23 (7) ◽  
pp. 916-921 ◽  
Author(s):  
P. Airey ◽  
H. Drawe ◽  
A. Henglein
Keyword(s):  
Free Radicals ◽  
White Phosphorus ◽  
High Yield ◽  
Red Phosphorus ◽  
Γ Irradiation ◽  
Γ Radiation ◽  
Chain Reactions ◽  
Phosphorus Containing ◽  
High Yields ◽  
Free Radical Chemistry

CHBr2PBr2 and (CHBr2)2PBr are formed in high yields and in preparatively useful amounts when solutions of white phosphorus in bromoform are exposed to γ-radiation. In the first stages of irradiation, a red phosphorus containing many groups from the solvent is the only reaction product. About 1000 molecules of P4 are consumed per 100 eV of energy absorbed. In the later stages of irradiation, free radicals from the solvent attack this red phosphorus and lead to the formation of bromophosphines in high yield. Chain reactions are formulated for the formation of both the red phosphorus and the bromophosphines.

Free radicals production and estimation of oxidative stress related to γ irradiation

1995 ◽  
Vol 47 (1-3) ◽  
pp. 265-270 ◽  
Author(s):  
D. Dubner ◽  
P. Gisone ◽  
I. Jaitovich ◽  
M. Perez
Keyword(s):  
Oxidative Stress ◽  
Free Radicals ◽  
Γ Irradiation
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