3,4-Dihydroxyphenylacetic acid

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3,4-Dihydroxyphenylacetic acid
3,4-Dihydroxyphenylacetic acid.svg
CAS number 102-32-9 YesY
PubChem 547
ChemSpider 532 YesY
DrugBank DB01702
MeSH 3,4-Dihydroxyphenylacetic+Acid
ChEBI CHEBI:41941 YesY
Jmol-3D images Image 1
Molecular formula C8H8O4
Molar mass 168.15 g mol−1
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

3,4-Dihydroxyphenylacetic acid (DOPAC) is a metabolite of the neurotransmitter dopamine.

Dopamine can be metabolized into one of three substances. One such substance is DOPAC. Another is 3-methoxytyramine (3-MT). Both of these substances are degraded to form homovanillic acid (HVA). Both degradations involve the enzymes monoamine oxidase (MAO) and catechol-O-methyl transferase (COMT), albeit in reverse order: MAO catalyzes dopamine to DOPAC, and COMT catalyzes DOPAC to HVA; whereas COMT catalyzes dopamine to 3-MT and MAO catalyzes 3-MT to HVA. The third metabolic end-product of dopamine is norepinephrine (noradrenaline).

DOPAC can be oxidized by hydrogen peroxide, leading to the formation of toxic metabolites which destroy dopamine storage vesicles in the substantia nigra. This may contribute to the failure of levodopa treatment of Parkinson's disease. A MAO-B inhibitor such as selegiline or rasagiline can prevent this from happening.

Biodegradation of dopamine

It can also be found in the bark of Eucalyptus globulus.[1]

This product has been synthesized (52% yield) from 4-Hydroxyphenylacetic acid via aerobic biotransformation using whole cell cultures of Arthrobacter protophormiae.[2][3]


  1. ^ Santos, Sónia A. O.; Freire, Carmen S. R.; Domingues, M. Rosário M.; Silvestre, Armando J. D.; Neto, Carlos Pascoal (2011). "Characterization of Phenolic Components in Polar Extracts of Eucalyptus globulus Labill. Bark by High-Performance Liquid Chromatography–Mass Spectrometry". Journal of Agricultural and Food Chemistry 59 (17): 9386–93. doi:10.1021/jf201801q. PMID 21761864. 
  2. ^ Robins, Karen T.; Osorio-Lozada, Antonio; Avi, Manuela; Meyer, Hans-Peter (2009). "Lonza: Biotechnology – A Key Ingredient for Success in the Future". CHIMIA International Journal for Chemistry 63 (6): 327–330. doi:10.2533/chimia.2009.327. 
  3. ^ Sutton, Peter; Whittall, John; (2012). Practical Methods for Biocatalysis and Biotransformations 2. Chichester, West Sussex: John Wiley & Sons, Ltd. pp. 150–153. ISBN 9781119991397.