Comparative Evaluation of Smart Sampling for hCG Determination: A New Potential Direction in Protein Biomarker...

Area of Science:

• Biochemistry
• Analytical Chemistry
• Biotechnology

Background:

• Dried blood spots (DBS) are crucial for clinical analysis but require extensive preparation for protein quantification via LC-MS.
• Low-abundance protein analysis is particularly challenging due to time-consuming sample preparation steps.
• Smart sampling integrates sample preparation onto the sampler, streamlining the process.

Purpose of the Study:

• To compare the performance of a novel smart sampling method for protein analysis.
• To evaluate smart sampling against an immunocapture magnetic bead method and a commercial electrochemiluminescence immunoassay (ECLIA).
• To assess the utility of smart sampling for protein biomarker analysis in complex matrices.

Main Methods:

• Three methods were compared: smart sampling, immunocapture on magnetic beads, and ECLIA.
• Human chorionic gonadotropin (hCG) was quantified in 21 single-blind serum samples.
• Performance was evaluated using linear regression and Bland-Altman analysis.

Main Results:

• All methods showed strong correlations (R² > 0.91) with actual sample concentrations.
• Immunocapture on magnetic beads yielded the highest linear correlation (R² = 0.974).
• Smart sampling demonstrated good agreement with both magnetic beads (bias -5.2) and ECLIA (bias 0.4 ± 4 ng/mL).

Conclusions:

• Smart sampling is a viable and promising new approach for bioanalysis.
• The method offers a streamlined alternative for protein biomarker analysis, especially from complex matrices.
• This study provides the first comparison of smart sampling with existing protein analysis techniques.