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The possible function of quinols, chromanols and chromenols in intracellular respiration

, : The possible function of quinols, chromanols and chromenols in intracellular respiration. AMER JOUR CLIN NUTRITION 9(4 Pt 2): 50-60

A survey is given of the chemical properties of four biochemically important groups of compounds: the vitamins E, the vitamins K the ubiquinones and plastiquinones. All four groups are known in the form of the p-benzoquinone. The isomeric chromenol has been described in the ubiquinone and plastoquinone series. All four p-quinones can be reduced to the quinol, or, an acid solution, to the chromanol (the chromanol of plastoquinone has not yet been described). Only a few of these compounds are known with certainty to be present in nature[long dash]the quinone in the vitamin K, ubiquinone and plastoquinone series, the quinol in the ubiquinone and the chromanol in the vitamin E series. The possible biochemical function of [alpha]-tocopherol and ubiquinone, both of which are localized in the mitochondria, is discussed. There is no direct evidence that [alpha]-tocopherol has any function in intracellular respiration, but the possibility remains open. There is good reason to believe that ubiquinone is a component of the respiratory chain operating between the flavoproteins and the cytochrome system. The possible function of vitamin K in intracellular respiration is also discussed. Possible reaction schemes for the participation of quinones and related compounds in oxidative phosphorylation are given.


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