Add time:08/28/2019         Source:sciencedirect.com

Dicarboxylic acids (DA) are formed from the ω-oxidation of monocarboxylic acids when the β-oxidation of free fatty acids is impaired. Medium-chain DA have the peculiar characteristic of being water soluble due to the presence of two carboxylic terminal groups in the molecule. Contrary to both long- and medium-chain triglycerides which are administered as emulsions, they can be given by a peripheral vein as inorganic salts. DA are β-oxidized at level of both peroxisomes and mitochondria via carnitine-independent pathway.The products of β-oxidation of odd-chain DA are acetyl-CoA and malonyl-CoA, which cannot be oxidized further, are used in lipogenesis. Moreover even-chain DA produce acetyl-CoA and succinyl-CoA, which is a gluconeogenetic precursor.Azelaic acid (C9), does not show acute or chronic toxicity effects in animals but much of it islost in urine (more than 50% of the given dose). Sebacic acid (C10) is lost in urine to a smaller extent (about 12% of the administered dose) and its energy density (6.64 Kcal/g) is greater than that of C9 (4.97 Kcal/g). Dodecanedioic acid (C12) seems to be the best candidate for parenteral nutrition, because it is eliminated in the urine only in minimal amounts (3.90% of the given dose), it is rapidly utilized by tissues, and it has a high energy density (7.20 Kcal/g).

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