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LR12-peptide quantitation in whole blood by RP-HPLC and intrinsic fluorescence detection: Validation and
M Parent1, A Boudier1, P Maincent1
1CITHEFOR, Université de Lorraine, EA 3452, Nancy, France.
Insights
A new HPLC method accurately quantifies the dodecapeptide LR12 in rat blood. This validated method aids in understanding peptide pharmacokinetics and degradation products.
Area of Science:
- Analytical Chemistry
- Pharmacology
- Biochemistry
Background:
- Accurate quantification of pharmaceutical peptides in biological matrices is crucial for pharmacokinetic studies.
- The dodecapeptide LR12, an inhibitor of Triggering Receptor Expressed on Myeloid cells-1, requires a validated analytical method for blood analysis.
- Existing methods may lack the sensitivity, selectivity, or robustness needed for complex biological samples like whole blood.
Purpose of the Study:
- To develop and validate a simple, sensitive, selective, and robust High-Performance Liquid Chromatography (HPLC) method for quantifying the dodecapeptide LR12 in rat whole blood.
- To optimize sample preparation techniques including protein precipitation and solid-phase extraction for efficient LR12 recovery.
- To evaluate the pharmacokinetic profile of LR12 and its disulfide dimer in rats following intraperitoneal administration.
Main Methods:
- Development of an HPLC method utilizing intrinsic fluorescence detection for LR12 quantitation.
- Optimization of chromatographic separation using a core-shell C18 column in gradient mode with specific mobile phases.
- Validation of the analytical method according to US Food and Drug Administration guidelines for bioanalytical methods.
- Application of the validated method in a preliminary pharmacokinetic study in rats.
Main Results:
- A validated HPLC method with a lower limit of quantitation of 50 ng/mL and linearity within the 50-500 ng/mL range was established.
- Optimized protein precipitation and solid-phase extraction procedures enhanced sample cleanup and analyte recovery.
- The method successfully differentiated between LR12 monomer and its disulfide dimer, identifying the dimer as a primary degradation product.
- Preliminary pharmacokinetic data for LR12 and its dimer were obtained.
Conclusions:
- This study presents the first fully validated HPLC method for the analysis of LR12 in rat blood samples.
- The optimized pre-analytical steps offer a valuable framework for developing similar methods for other peptide-based therapeutics.
- The developed method enables comprehensive pharmacokinetic and degradation product analysis of LR12.
Abstract:
A simple, sensitive, selective and robust HPLC method based on intrinsic fluorescence detection was developed for the quantitation of a dodecapeptide (designated as LR12), inhibitor of Triggering Receptor Expressed on Myeloid cells-1, in rat whole blood. Sample treatment was optimized using protein precipitation and solid-phase extraction. Chromatographic separation was carried out in a gradient mode using a core-shell C18 column (150 × 4.6 mm, 3.6 μm) with mobile phases of acetonitrile and water containing trifluoroacetic acid at 1.0 mL/min. The method was validated using methodology described by the US Food and Drug Administration guidelines for bioanalytical methods. Linearity was demonstrated within the 50-500 ng/mL range and the lower limit of quantitation was 50 ng/mL. Finally, a preliminary pharmacokinetic study after intraperitoneal injection of LR12 in rats was conducted to evaluate both LR12 monomer and its corresponding disulfide dimer, the main product of degradation. Beyond the fact that this paper describes the first fully validated method for LR12 analysis in blood samples, the approach followed here to optimize pre-analytical steps could be beneficial to develop HPLC and/or MS methods for other pharmaceutical peptides.
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