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An aldehyde, C8H9NO3, that is one of several forms of vitamin B6.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Biochemistry) biochem a naturally occurring derivative of pyridoxine that is a precursor of a coenzyme (pyridoxal phosphate) involved in several enzymic reactions. Formula: (CH2OH)(CHO)C5HN(OH)(CH3)
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.pyridoxal - a B vitamin that is essential for metabolism of amino acids and starchpyridoxal - a B vitamin that is essential for metabolism of amino acids and starch
B complex, B vitamin, B-complex vitamin, vitamin B, vitamin B complex, B - originally thought to be a single vitamin but now separated into several B vitamins
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References in periodicals archive ?
* Patients with coronary artery disease have, on average, 34.2% lower levels of the bioactive form of B6 (pyridoxal 5'-phosphate) compared to those without heart problems, which may relate to its role in lowering homocysteine.
Pyridoxal 5 phosphate for neuroleptic-induced tardive dyskinesia.
Blood agar plates with (left) and without (right) pyridoxal supplement from a study of neonatal Granulicatella elegans bacteremia, London, UK.
Vitamin [B.sub.6] and its derivative pyridoxal 5'-phosphate (PLP) are essential to over 100 enzymes, most of which are involved in protein metabolism.
Isoniazid (true) inhibits glutamic acid decarboxylase activity, which is dependent on pyridoxal phosphatase and blocks the production of gamma amino butyric acid (GABA).
GAD is a pyridoxal 5'-phosphate (PLP) dependent enzyme, which catalyzes the irreversible decarboxylation of L-glutamic acid to gamma-aminobutyric acid (GABA) and carbon dioxide.
The pyridoxal 5;-phosphate (PLP) concentration was strikingly increased for a non-vitamin B6-supplemented patient, giving a raised PLP-topyridoxic acid (PA) ratio (reference, <5 using SI units) (2).
Szefer, "Reversed-phase high-performance liquid chromatography method with coulometric electrochemical and ultraviolet detection for the quantification of vitamins B(1) (thiamine), B(6) (pyridoxamine, pyridoxal and pyridoxine) and B(12) in animal and plant foods," Journal of Chromatography A, vol.
Pyridoxal phosphate, namely, vitamin B6, was a coenzyme of aminopherase and decarboxylase in the amino acid metabolism that could promote decarboxylation of glutamic acid.
TNSALP activity is found in bones, cartilage, and tooth tissue at almost all levels, and it is known to remove phosphorus from molecules containing phosphate, such as pyridoxal phosphate (PLP), phosphoethanolamine (PEA), and pyrophosphate (PPi).
Studying the antiemetic effect of vitamin B6 for morning sickness: pyridoxine and pyridoxal are prodrugs.