Determination of 5-hydroxy-L-[beta-11C]tryptophan and its in vivo-formed radiolabeled metabolites in brain tissue using high performance liquid chromatography: a study supporting radiotracer kinetics obtained with positron emission tomography

Nucl Med Biol. 1997 Nov;24(8):733-8. doi: 10.1016/s0969-8051(97)00114-5.


A high performance liquid chromatographic system was developed for separation of 11C-labeled 5-hydroxy-L-tryptophan ([11C]HTP) and in vivo formed radiolabeled metabolites in rat brain tissue. Analysis of brain homogenate revealed that the main part of the radioactivity was associated with 11C-labeled 5-hydroxyindole-3-acetic acid after intravenous injection of [11C]HTP to the rat. The serotonin synthesis rate in the brain was calculated and closely correlated to the serotonin synthesis rate in monkey and human measured using positron emission tomography.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • 5-Hydroxytryptophan / blood
  • 5-Hydroxytryptophan / metabolism
  • 5-Hydroxytryptophan / pharmacokinetics*
  • Animals
  • Brain / metabolism*
  • Carbon Radioisotopes*
  • Carboxylic Acids / metabolism
  • Chromatography, High Pressure Liquid
  • Hydroxyindoleacetic Acid / metabolism
  • Male
  • Radiopharmaceuticals / blood
  • Radiopharmaceuticals / metabolism
  • Radiopharmaceuticals / pharmacokinetics*
  • Rats
  • Rats, Sprague-Dawley
  • Serotonin / metabolism
  • Tomography, Emission-Computed


  • Carbon Radioisotopes
  • Carboxylic Acids
  • Radiopharmaceuticals
  • Serotonin
  • Hydroxyindoleacetic Acid
  • 5-Hydroxytryptophan