| 释义 |
pyridoxal Biochem.|pɪrɪˈdɒksæl|
[f. as next + -al2.]
One of the forms of vitamin B6 (derived from pyridoxine by oxidation of the 4-hydroxymethyl group to aldehyde), which usu. occurs in mammals as the phosphate ester and is a co-enzyme in a number of metabolic processes, notably transamination. Cf. pyridoxine.
1944E. E. Snell in Jrnl. Biol. Chem. CLIV. 313 (caption) Pyridoxal. Ibid., When pyridoxamine or pyridoxal is used as a standard of comparison with S[treptococcus] lactis, values for the ‘B6’ content of natural materials are obtained similar to those indicated by yeast assay, instead of the absurdly high values obtained against a pyridoxine standard. 1955Sci. News Let. 1 Oct. 211/1 The cancer cells..need these seven vitamins: choline, folic acid, nicotinamide, pantothenate, pyridoxal, riboflavin and thiamine. 1966E. R. M. Kay Biochem. xxiii. 302 Transamination reactions appear to involve a transfer of the amino group to the pyridoxal, forming pyridoxamine and a keto acid. 1970[see pyridoxamine]. 1974Nature 9 Aug. 502/2 Pyridoxine, the major dietary form of vitamin B6, is rapidly converted in the body to pyridoxal phosphate.., the coenzyme form. |