Targeted Protein Quantification Analysis of Plasma Samples Based on PRM
Plasma is one of the sample types with the highest clinical translational value in proteomics research due to its wide availability, easy accessibility, and rich systemic biological information. However, the dynamic range of protein concentrations in plasma can reach 10^10, with high-abundance proteins (such as albumin and immunoglobulins) accounting for more than 90% of the total protein mass, making it difficult to accurately identify low-abundance proteins, especially potential disease biomarkers. Parallel Reaction Monitoring (PRM) technology, with its high selectivity and sensitivity, has become an important tool for targeted quantitative analysis of low-abundance proteins in plasma. This article systematically analyzes the key advantages and technical pathways of PRM in targeted protein quantification in plasma samples.
I. Technical Challenges in Plasma Sample Analysis
1. High Dynamic Range Suppression EffectHigh-abundance proteins cause ion suppression, obscuring low-abundance targets.
2. Complex Background InterferencePlasma contains various interfering components (such as lipids, small molecules, glycoproteins) that affect the stability of mass spectrometry analysis.
3. High Reproducibility RequirementsClinical sample analysis requires extremely high batch consistency and quantitative precision.
4. Sample Volume LimitationsLimited samples from some clinical cohorts require high-quality quantification under micro-sample conditions.
II. Applicability of PRM Technology in Plasma Protein Quantification
PRM is a targeted analysis technology based on high-resolution mass spectrometry platforms, suitable for precise quantification of low-abundance proteins in small, highly complex samples.
Key advantages include:
1. High-Resolution Orbitrap ScanningEffectively distinguishes background ions from target ions, improving signal-to-noise ratio.
2. Multiple Fragment Ion QuantificationAllows for the selection of the optimal responding ion peak for quantification, enhancing method robustness.
3. Synergistic Application with Stable Isotope Internal StandardsAchieves absolute quantification and inter-batch correction, meeting the needs of clinical sample analysis.
III. Standard Workflow for PRM Analysis of Plasma Samples
1. Sample Pretreatment
(1) High-abundance protein removal: Commonly used immunoaffinity columns (e.g., MARS) to remove albumin/IgG.
(2) Protein concentration normalization: Standardize input using BCA or Bradford methods.
(3) Denaturation, reduction, alkylation: Enhance enzymatic digestion efficiency and peptide recovery rate.
2. Enzymatic Digestion and Internal Standard Addition
(1) Use Trypsin or Lys-C enzymes for thorough digestion.
(2) Add SIL peptides before digestion to ensure calibration throughout the process.
3. Peptide Purification and Enrichment
(1) C18 solid-phase extraction to remove salts and small molecule interferences.
(2) Add affinity enrichment strategies such as SISCAPA according to target concentration needs.
4. LC-PRM Mass Spectrometry Analysis
(1) High-performance liquid chromatography (NanoLC or μLC) for separation.
(2) PRM mode parameter optimization: Fine-tune isolation window (1~2 Da), NCE energy, injection time, etc.
5. Data Analysis and Quality Control
(1) Use Skyline for fragment ion peak identification, integration, and internal standard correction.
(2) Set QC samples, blanks, and repeat injections to control system stability.
Biotech company BettaPharma has established a highly sensitive, highly standardized plasma PRM quantification platform focused on clinical sample proteomics applications.
Distinctive advantages include:
1. Exclusive Peptide DatabaseCovers 500+ common disease-related protein targets, supporting rapid method development.
2. High-Throughput Orbitrap Mass Spectrometry PlatformSupports μg-level sample input, with sensitivity reaching low femtomole levels.
3. Automated Data Processing WorkflowSkyline + Python scripts for efficient quantification and batch quality control.
4. Combinatorial Enrichment and Removal SolutionsMatch high-abundance protein removal, affinity enrichment, and fractionation strategies according to project needs.
Plasma proteomic information holds high biomedical value. PRM technology exhibits strong advantages in accurately identifying and quantifying low-abundance plasma proteins, making it particularly suitable for biomarker validation, drug research, and large cohort clinical projects. BettaPharma will continue to promote the development of targeted protein quantification platforms, providing clients with efficient, standardized, and repeatable plasma proteomics solutions.
BettaPharma Biotechnology - A premium service provider for bioproduct characterization and multi-omics mass spectrometry detection.
Related Services:
How to order?
