Noun
gulonolactone (uncountable)
(organic chemistry) The lactone of gulonic acid, (3S,4R,5R)-5-((S)-1,2-dihydroxyethyl)-3,4-dihydroxydihydrofuran-2(3H)-one
L -Gulonolactone then reacts with oxygen, catalyzed by the enzyme L -gulonolactone oxidase (which is nonfunctional in humans and other Haplorrhini primates) and the cofactor FAD+. Source: Internet
Humans, other higher primates, guinea pigs and most bats require dietary L -gulonolactone oxidase because the enzyme catalysing the last step in the biosynthesis is highly mutated and non-functional, therefore, unable to make ascorbic acid. Source: Internet
Recent orders of birds and most mammals make ascorbic acid in their liver where the enzyme L -gulonolactone oxidase is required to convert glucose to ascorbic acid. Source: Internet