Measurement of urinary vanilmandelic acid and homovanillic acid by high-performance liquid chromatography with electrochemical detection following extraction by ion-exchange and ion-moderated partition.
J Chromatogr
; 336(1): 173-88, 1984 Dec 07.
Article
en En
| MEDLINE
| ID: mdl-6526918
ABSTRACT
An improved protocol has been developed to isolate homovanillic acid (HVA) and vanilmandelic acid (VMA) from urine with strong anion-exchange resin. The sample is diluted with acetate buffer and passed through a disposable column. HVA, uric acid, and many hydrophobic organic acids are removed with 1.0 M acetic acid--ethanol. Then VMA is eluted with 0.5 M phosphoric acid. Two isocratic mobile phases allow rapid high-performance liquid chromatographic measurement of VMA (5 min) and HVA (8 mins) on a 5-micron ODS column. Selective conditions were developed with dual-electrode coulometric detection to permit specific measurement of VMA, HVA, and internal standards, with less than 5% between-run variation.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Fenilacetatos
/
Ácido Vanilmandélico
/
Ácido Homovanílico
Tipo de estudio:
Diagnostic_studies
Límite:
Humans
Idioma:
En
Revista:
J Chromatogr
Año:
1984
Tipo del documento:
Article