Intrinsic erythrocyte labeling and attomole pharmacokinetic tracing of 14C-labeled folic acid with accelerator mass spectrometry

Bruce A. Buchholz, Ali Arjomand, Stephen R. Dueker, Philip D Schneider, Andrew J. Clifford, John S. Vogel

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

Long-term physiologic tracing of nutrients, toxins, and drugs in healthy subjects is not possible using traditional decay counting of radioisotopes or stable isotope mass spectrometry due to radiation exposure and limited sensitivity, respectively. A physiologic dose of 14C-labeled folic acid (35 μg, 100 nCi) was ingested by a healthy adult male and followed for 202 days in plasma, erythrocytes, urine, and feces using accelerator mass spectrometry. All samples and generated wastes were classified nonradioactive and the subject received a life-time-integrated radiological effective dose of only 11 μSv. Radiolabeled folate appeared in plasma 10 min after ingestion but did not appear in erythrocytes until 5 days later. Approximately 0.4% of the erythrocytes were intrinsically labeled with an average of 130 14C atoms during erythropoiesis from the pulse of plasma [14C]folate. An appropriate radiocarbon-labeled precursor can intrinsically label DNA or a specific protein during synthesis and obtain limits of quantitation several orders of magnitude below that of stable isotope methods.

Original languageEnglish (US)
Pages (from-to)348-352
Number of pages5
JournalAnalytical Biochemistry
Volume269
Issue number2
DOIs
StatePublished - May 1 1999

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Pharmacokinetics
Folic Acid
Labeling
Particle accelerators
Mass spectrometry
Mass Spectrometry
Erythrocytes
Plasmas
Isotopes
Erythropoiesis
Feces
Radioisotopes
Nutrients
Labels
Healthy Volunteers
Eating
Urine
Radiation
Food
Atoms

Keywords

  • Accelerator mass spectrometry
  • AMS
  • Folate
  • Intrinsic labeling
  • Pharmacokinetics
  • Physiologic dose

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

Cite this

Intrinsic erythrocyte labeling and attomole pharmacokinetic tracing of 14C-labeled folic acid with accelerator mass spectrometry. / Buchholz, Bruce A.; Arjomand, Ali; Dueker, Stephen R.; Schneider, Philip D; Clifford, Andrew J.; Vogel, John S.

In: Analytical Biochemistry, Vol. 269, No. 2, 01.05.1999, p. 348-352.

Research output: Contribution to journalArticle

Buchholz, Bruce A. ; Arjomand, Ali ; Dueker, Stephen R. ; Schneider, Philip D ; Clifford, Andrew J. ; Vogel, John S. / Intrinsic erythrocyte labeling and attomole pharmacokinetic tracing of 14C-labeled folic acid with accelerator mass spectrometry. In: Analytical Biochemistry. 1999 ; Vol. 269, No. 2. pp. 348-352.
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