| vanillyl | <chemistry> The hypothetical radical characteristic of vanillic alcohol. Origin: Vanillic + -yl. Source: Websters Dictionary (01 Mar 1998) |
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| vanillyl-alcohol oxidase | <enzyme> From penicillium simplicissimum; contains fad; forms vanillin or 4-hydroxybenzaldehyde, respectively, from vanillyl alcohol or 4-hydroxybenzyl alcohol Registry number: EC 1.1.3.- Synonym: 4-hydroxybenzyl alcohol oxidase (26 Jun 1999) |
| vanillylmandelic acid | Misnomer for 4-hydroxy-3-methoxymandelic acid (a,3-dihydroxy-2-methoxybenzeneacetic acid);the major urinary metabolite of adrenal and sympathetic catecholamines (e.g., from both epinephrine and norepinephrine); elevated in most patients with pheochromocytoma. Acronym: VMA (05 Mar 2000) |
| vanillylmandelic acid test | A test for catecholamine-secreting tumours (pheochromocytoma and neuroblastoma) performed on a 24-hr urine specimen; it is based on the fact that vanillylmandelic acid is the major urinary metabolite of norepinephrine and epinephrine. Synonym: 3-methoxy-4-hydroxymandelic acid test, VMA test. (05 Mar 2000) |