Differences in metabolite profiles caused by pre-analytical blood processing procedures

Area of Science:

• Clinical Chemistry
• Biomarker Discovery
• Metabolomics

Background:

• Metabolomic analysis of serum and plasma is increasingly used for biomarker discovery and disease diagnosis.
• Metabolite stability during pre-analytical blood processing is critical for reliable diagnostic biomarkers.
• The impact of blood processing on metabolite stability remains incompletely understood.

Purpose of the Study:

• To compare metabolite levels between human serum and plasma.
• To assess the impact of pre-centrifugation storage conditions on plasma metabolite stability.

Main Methods:

• Matched serum and plasma samples were analyzed.
• Gas chromatography-mass spectrometry (GC-MS) and liquid chromatography-mass spectrometry (LC-MS) were employed.
• Plasma samples were stored at room and cold temperatures before centrifugation.

Main Results:

• 76 metabolites showed significant differences between serum and plasma.
• 45 plasma metabolites were significantly affected by pre-centrifugation storage conditions.
• Specific metabolites were identified as sensitive to processing and storage.

Conclusions:

• Blood processing and storage significantly influence metabolomic profiles.
• These pre-analytical factors must be carefully considered in biomarker discovery.
• Standardized protocols are essential for accurate metabolomic biomarker applications in diagnostics.