pyridoxicadj.
/ˌpɪrᵻˈdɒksɪk/, U.S. /ˌpɪrᵻˈdɑksɪk/ Biochemistry.
pyridoxic acid n. (more fully 4-pyridoxic acid) a biologically inactive compound which is the form in which excess vitamin B6 (see pyridoxine n.) is usually excreted.Pyridoxic acid is derived from pyridoxine by oxidation of the 4-hydroxymethyl group to a carboxyl group.
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the world > matter > chemistry > organic chemistry > substances from animals or humans > [noun] > substances in urine > miscellaneous others
melanurin1844
kyestein1846
indican1859
heteroxanthine1886
homogentisic acid1891
urobilinogen1893
uroporphyrin1924
uroporphyrinogen1924
pyridoxic acid1944
1944 J. W. Huff & W. A. Perlzweig in Jrnl. Biol. Chem. 155 355 A fluorescent compound appearing in urine after the ingestion of pyridoxine was isolated and identified as 2-methyl-3-hydroxy-4-carboxy-5-hydroxymethylpyridine (4-pyridoxic acid).
1968 H. Baker & O. Frank Clin. Vitaminol. vii. 79 In subjects on a normal diet, pyridoxic acid excretion accounted for only about half the intake of vitamin B6.
1988 BioFactors 1 187/1 A ‘pyridoxine oxidase’ from rabbit liver, presumably catalyzing pyridoxal formation as an intermediate en route to 4-pyridoxic acid,..was later found to be artifactual.
This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022).
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adj.1944- to call a spade a shovel
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