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Ketone bodies are transported from the liver to other tissues, where acetoacetate and β-hydroxybutyrate can be reconverted to acetyl-CoA to produce reducing equivalents (NADH and FADH 2), via the citric acid cycle. Though it is the source of ketone bodies, the liver cannot use them for energy because it lacks the enzyme thiophorase (β ...
Although beta-hydroxybutyrate is the predominant circulating ketone, urine test strips only measure acetoacetate. Urinary ketones often correlate poorly with serum levels because of variability in excretion of ketones by the kidney, influence of hydration status, and renal function. [1] [8]
Acetoacetate is produced in the mitochondria of liver cells by the addition of an acetyl group from acetyl CoA. This creates 3-hydroxy-3-methylgluteryl CoA which loses an acetyl group, becoming acetoacetate. [3] Beta-Hydroxybutyrate. β-Hydroxybutyrate is also synthesized within liver cells; this is accomplished through the metabolism of fatty ...
Both acetoacetate and beta-hydroxybutyrate are acidic, and, if levels of these ketone bodies are too high, the pH of the blood drops, resulting in ketoacidosis. Ketoacidosis is known to occur in untreated type I diabetes (see diabetic ketoacidosis ) and in alcoholics after prolonged binge-drinking without intake of sufficient carbohydrates (see ...
β-Hydroxybutyric acid, also known as 3-hydroxybutyric acid or BHB, is an organic compound and a beta hydroxy acid with the chemical formula CH 3 CH(OH)CH 2 CO 2 H; its conjugate base is β-hydroxybutyrate, also known as 3-hydroxybutyrate. β-Hydroxybutyric acid is a chiral compound with two enantiomers: D-β-hydroxybutyric acid and L-β-hydroxybutyric acid.
Acetoacetate is an intermediate in the Krebs cycle which releases energy from sugars and carbohydrates. [ 22 ] In medicine, acetone , acetoacetate, and beta-hydroxybutyrate are collectively called ketone bodies , generated from carbohydrates , fatty acids , and amino acids in most vertebrates , including humans.
Under these conditions, acetyl-CoA is diverted to the formation of acetoacetate and beta-hydroxybutyrate. [10] Acetoacetate, beta-hydroxybutyrate, and their spontaneous breakdown product, acetone, are frequently, but confusingly, known as ketone bodies (as they are not "bodies" at all, but water-soluble chemical substances). The ketones are ...
The test does not measure β-hydroxybutyrate, the most abundant ketone in the body; during treatment of ketoacidosis β-hydroxybutyrate is converted to acetoacetate so the test is not useful after treatment begins [11] and may be falsely low at diagnosis. [14] Similar tests are used in dairy cows to test for ketosis. [15]
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