Abstract
SUMMARYThe water‐soluble 2‐thiobarbituric.acid‐reactive substances (TBRS) from oxidized and UV‐irradiated unsaturated fatty acid esters and squalene were fractionated on Sephadex G‐10 columns, and the fractions were characterized by elution volume, UV‐absorption spectra, and behavior on TLC plates. By these criteria the main component in all eases was unequivocally identified as malonaldehyde (MA). Other TBRS accompanied MA but were clearly distinguishable. They were not identified, how. ever. With squalene, the total TBRS per double bond were only one‐sixth of those of the fatty acid esters, and MA accounted for about half.
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