72 ° C.
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Malondialdehyde ( MDA), according to IUPAC propanedial, is a highly reactive dialdehyde. It arises as a biochemical degradation product polyunsaturated fatty acid and is an important biomarker of oxidative stress.
Pure malondialdehyde is unstable. It is commercially available usually as a dilute aqueous solution of the sodium salt of the enol. Laboratory malondialdehyde can be produced by the hydrolysis of 1,1,3,3- tetramethoxypropane in situ. Of the two possible enol isomers the trans isomer in an aqueous organic solvent and the cis-isomer is preferred.
Biological and biochemical significance
Malondialdehyde is a major degradation product in the oxidation of polyunsaturated fatty acids. It serves as a biomarker for the oxidative stress. For this, the solution to be examined, for example, blood plasma, mixed with thiobarbituric acid. One molecule of malondialdehyde reacts with thiobarbituric acid to two molecules of a pink dye having an absorption maximum at 532 nm and determined photometrically or by means of high performance liquid chromatography (HPLC) can be determined.
Another reagent for the quantitative determination of malondialdehyde is a hydrochloric acid alcoholic solution of 2- methylindole. The thus formed in the reaction with MDA red dye has an absorption maximum at 555 nm
In addition, the highly reactive malondialdehyde, which can react with DNA and proteins, potentially mutagenic, atherogenic and carcinogenic. Example, it can cross-link proteins through its bi-functionality.
In patients with diabetes mellitus, the MDA levels are significantly elevated in the plasma.
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