A comparison of HPLC and bioassay methods for plasma melanotan‐II (MT‐II) determination: Application to a pharmacokinetic study in rats

Sydney O. Ugwu, James Blanchard, Linh D. Nguyen, Mac E. Hadley, Robert T. Dorr

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

The pharmacokinetic profile of the melanotropic peptide, melanotan‐II (MT‐II), was determined in rats following a 0.3 mg kg−1 intravenous dose. Regression analysis of the plasma MT‐II concentrations determined using HPLC and bioassay methods indicated the existence of a significant linear correlation (r = 0.90, p < 0.001). The plasma concentration versus time plots determined using the two assay methods yielded biphasic disposition profiles that were essentially superimposable. The following pharmacokinetic parameters were assessed from plasma concentration versus time data using both methods: Cmax, AUC, CLs, t1/2β, MRT V, and Vss. Statistical comparison showed that the parameters measured by each method were not significantly different (at the 0.05 level) except for t1/2β, MRT and Vss. The presence of even one aberrant data point in the β‐phase can significantly influence t1/2β when only a few data points are available in the β‐phase. Since MRT and Vss were calculated from t1/2β it is not surprising that these two parameters also differed between methods.

Original languageEnglish (US)
Pages (from-to)383-390
Number of pages8
JournalBiopharmaceutics & Drug Disposition
Volume15
Issue number5
DOIs
StatePublished - Jul 1994

Keywords

  • Bioassay
  • Correlation
  • HPLC
  • Peptide
  • Pharmacokinetics
  • α‐melanotropin

ASJC Scopus subject areas

  • Pharmacology
  • Pharmaceutical Science
  • Pharmacology (medical)

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