Solid Phase Extraction and Analysis of Coenzyme Q10 from Plasma Using Oasis PRiME HLB for Clinical Research

Significance of the Topic

This study addresses the extraction and quantification of Coenzyme Q10 (CoQ10), a lipid-soluble molecule critical for mitochondrial ATP synthesis and antioxidant defense. Accurate plasma measurement of CoQ10 is essential for research into cardioprotection, neurologic disorders, and other conditions linked to CoQ10 deficiency.

Objectives and Study Overview

The goal was to develop a simplified solid phase extraction (SPE) protocol using Oasis PRiME HLB µElution plates, followed by UPLC-PDA analysis on a CORTECS UPLC T3 column, to achieve rapid, efficient, and reproducible quantification of CoQ10 in human plasma.

Methodology and Instrumentation

• Sample Pretreatment: 150 µL plasma spiked with CoQ9 marker (1 µg/mL) underwent benzoquinone oxidation and protein precipitation with 50:50 acetonitrile:isopropanol at a 6:1 solvent-to-plasma ratio, followed by centrifugation.
• SPE Cleanup: Supernatants diluted with 12% phosphoric acid, loaded directly onto Oasis PRiME HLB µElution plates without conditioning, washed with ammonia buffer and methanol, dried under vacuum, and eluted with two 25 µL aliquots of 50:50 acetonitrile:isopropanol.
• Chromatography: ACQUITY UPLC I-Class system with CORTECS UPLC T3 (2.1×50 mm, 1.6 µm) column; isocratic 80:20 acetonitrile:isopropanol with 0.08% formic acid; PDA detection at 275 nm; 7.5 µL injection volume; 600 µL/min flow; column at 40 °C.
• Data Analysis: MassLynx v4.1 with TargetLynx for calibration and quantification, using standard addition to correct for endogenous CoQ10.

Main Results and Discussion

• Precipitation Optimization: 50:50 acetonitrile:isopropanol at 6:1 ratio yielded complete CoQ10 recovery.
• Dilution Conditions: 12% phosphoric acid ensured strong SPE binding and minimized analyte breakthrough; other diluents (water, PBS) were less effective.
• Phospholipid Removal: Oasis PRiME HLB eliminated over 99% of residual phospholipids compared to protein precipitation alone, preserving column life.
• Elution Recovery: 50:50 acetonitrile:isopropanol delivered the highest CoQ10 yield (64% overall including precipitation and SPE).
• Chromatographic Separation: CoQ9 and CoQ10 baseline-resolved in under 2 minutes; CORTECS UPLC T3 outperformed other chemistries by providing sharp peaks and complete separation from endogenous interferences.
• Quantitative Performance: Linear range 50–5000 ng/mL with 1/x weighting (R² = 0.995); accuracy within ±13% (mean deviation 5.6%); precision RSD <12%; endogenous CoQ10 corrected at 203 ng/mL.

Benefits and Practical Applications

• No conditioning or equilibration steps simplify SPE workflow and reduce solvent consumption.
• µElution format concentrates extracts without evaporation, minimizing analyte loss and saving time.
• High phospholipid removal improves method robustness and extends column lifetime in high-throughput labs.
• Method is well suited for clinical research requiring reliable CoQ10 quantification in plasma.

Future Trends and Potential Applications

• Coupling with mass spectrometry for enhanced specificity and sensitivity in complex matrices.
• Application of Oasis PRiME HLB µElution to other lipophilic biomarkers.
• Automation of SPE and UPLC processes for higher throughput in clinical and QC laboratories.
• Development of decentralized or point-of-care CoQ10 monitoring platforms.

Conclusion

The optimized SPE-UPLC-PDA workflow using Oasis PRiME HLB µElution plates and CORTECS UPLC T3 column enables fast, accurate, and precise measurement of CoQ10 in plasma. Key advantages include simplified preparation, exceptional phospholipid cleanup, and robust chromatographic separation, making this approach ideal for clinical research applications.

Instrument Used

• Oasis PRiME HLB µElution Plate
• ACQUITY UPLC I-Class System with PDA detector
• CORTECS UPLC T3 Column, 1.6 µm, 2.1×50 mm

References

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• Duberley K.E.C. et al. CoQ10 quantification in muscle, fibroblasts, and cerebrospinal fluid by LC-MS/MS using a deuterated internal standard. Rapid Commun. Mass Spectrom. 2013;27(9):924–930.
• DiNicolantonio J.J., Bhutani J., McCarty M.F., O’Keefe J.H. Coenzyme Q10 for the treatment of heart failure: a literature review. Open Heart. 2015;2(1):e000326.