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Coenzyme Q 10 (CoQ 10 / ˌ k oʊ k j uː ˈ t ɛ n /), also known as ubiquinone, is a naturally occurring biochemical cofactor (coenzyme) and an antioxidant produced by the human body. [ 1 ] [ 2 ] [ 3 ] It can also be obtained from dietary sources, such as meat, fish, seed oils, vegetables, and dietary supplements .
Similarly, the 48-hour area under the curve for a ubiquinol formulation was only 52% of the area under the curve for the patented ubiquinone CoQ10 formulation. The study illustrated that the formulation of the CoQ10 supplement is more important for absorption and bioavailability than the form is, i.e. whether ubiquinone or ubiquinol. [12]
A ubiquinol is an electron-rich (reduced) form of coenzyme Q (ubiquinone). The term most often refers to ubiquinol-10 , with a 10-unit tail most commonly found in humans. The natural ubiquinol form of coenzyme Q is 2,3-dimethoxy-5-methyl-6-poly prenyl-1,4-benzoquinol, where the polyprenylated side-chain is 9-10 units long in mammals .
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The head and the tail section are joined in a condensation reaction. Ubiquinol is converted from ubiquinone by oxidoreductase enzymes. [25] In the Coenzyme Q10 cycle, all three redox forms of Coenzyme Q10 – ubiquinone, ubiquinol, and the unstable intermediate form semiubiquinone – are converted from one form to the other. [26]
Ubiquinol (QH 2) binds to the Q o site of complex III via hydrogen bonding to His182 of the Rieske iron-sulfur protein and Glu272 of Cytochrome b. Ubiquinone (Q), in turn, binds the Q i site of complex III. Ubiquinol is divergently oxidized (gives up one electron each) to the Rieske iron-sulfur '(FeS) protein' and to the b L heme.
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