Multi Reaction Monitoring MRM Service

Overview

MRM (Multiple Reaction Monitoring) is a targeted mass spectrometry approach designed for precise quantification of selected peptide or protein targets.

During MRM analysis, specific precursor-product ion transitions are monitored by LC-MS/MS to selectively detect target peptides within complex biological samples. By focusing measurement on predefined molecular targets, MRM provides high specificity and reproducible quantitative performance for targeted protein analysis.

Figure 1. Principle of MRM

MRM Based Quantitative Analysis Service at MtoZ Biolabs

MtoZ Biolabs provides MRM-based targeted LC-MS/MS quantification services for selected protein and peptide targets across biological samples.

The service supports both relative and absolute quantification according to study objectives. Relative quantification enables comparison of target peptide abundance across experimental groups, while absolute quantification incorporates isotope-labeled internal standards and calibration strategies to determine target concentrations.

MRM workflows are optimized according to target information, sample characteristics, and quantitative requirements to generate reliable measurements for targeted protein analysis.

When This Service Is a Good Fit

MRM-based quantification is suitable for projects where:

• specific protein or peptide targets have been identified; 
• quantitative verification of candidate targets is required; 
• consistent measurement across multiple samples is needed; 
• target concentration measurement is required using appropriate standards; 
• focused analysis of selected proteins is preferred. 

For studies requiring broad protein discovery and large-scale quantitative profiling, discovery-oriented approaches such as DIA or label-free quantitative proteomics can be considered before targeted MRM validation.

Analysis Workflow

1. Target Peptide Selection

Target proteins and peptide sequences are evaluated based on protein sequence information, peptide uniqueness, and quantitative suitability.

2. Sample Preparation

Samples undergo protein extraction, enzymatic digestion, and peptide preparation according to sample characteristics and analytical requirements.

3. MRM LC-MS/MS Acquisition

Selected precursor-product ion transitions are monitored using targeted LC-MS/MS acquisition to measure target peptide signals.

4. Quantitative Data Processing

Chromatographic peaks and transition responses are evaluated for quantitative analysis.

For absolute quantification projects, isotope-labeled internal standards and calibration curves can be incorporated to calculate target peptide or protein concentrations.

Sample Submission Requirements

1. Supported Sample Types

MRM analysis can be applied to conventional biological samples, including tissues, cells, biological fluids, and purified protein or peptide samples.

2. Protein Amount and Concentration

Minimum total protein amount: >40 μg

Recommended protein concentration: >0.5 μg/μL

Final sample requirements depend on target abundance, sample complexity, and quantitative objectives.

3. Storage and Shipping

Samples should be stored under appropriate frozen conditions and shipped on dry ice.

Protein solutions should avoid high concentrations of salts, detergents, or other LC-MS/MS-incompatible components.

Applications

1. Biomarker Validation

MRM is commonly used to quantify candidate biomarkers identified from discovery proteomics studies, enabling verification across independent sample sets and larger biological cohorts.

2. Disease Mechanism Studies

Targeted measurement of disease-associated proteins or peptides supports investigation of molecular changes involved in disease-related pathways and biological regulation.

3. Drug Response and Pharmacodynamic Studies

MRM enables monitoring of selected protein changes following drug treatment or experimental perturbation, supporting evaluation of molecular responses and pathway modulation.

4. Clinical and Translational Research

Targeted LC-MS/MS assays support quantitative measurement of selected proteins or peptides in complex biological samples for translational research studies.

Service Advantages

1. High Target Specificity

MRM monitors predefined precursor-product ion transitions, enabling selective measurement of target peptides in complex biological matrices.

2. Sensitive Targeted Quantification

Focused acquisition of selected peptide targets supports sensitive measurement without requiring antibody-based detection.

3. Reproducible Quantitative Performance

Optimized transition selection, chromatographic conditions, and standardized workflows support consistent quantitative results across samples and analytical batches.

4. Flexible Quantification Strategies

MRM workflows can support relative quantification or absolute concentration measurement depending on assay design and available standards.

Deliverables

1. Target Peptide Information

Selected peptide sequences and quantitative target information.

2. MRM Transition Information

Precursor-product ion transition details used for targeted measurement.

3. Quantitative Results

Relative quantitative comparison or calculated target concentration results.

4. Quality Assessment Results

Chromatographic peak evaluation and quantitative quality information.

5. Raw Mass Spectrometry Data

Original LC-MS/MS data files generated during analysis.

6. Final Report

Processed results, figures, and analytical summary.

FAQ

Q1. Can MRM provide absolute protein quantification?

Yes. Absolute quantification can be performed using isotope-labeled internal standards and calibration curves when appropriate assay conditions are established.

Q2. What is the difference between MRM and PRM?

MRM typically monitors predefined precursor-product ion transitions for targeted quantification, while PRM uses high-resolution MS/MS acquisition to collect fragment-ion information from selected precursors. The appropriate method depends on target number, sensitivity requirements, and study objectives.

Q3. Is MRM suitable for discovery proteomics?

No. MRM is a targeted approach designed for predefined proteins or peptides. Discovery studies requiring broad protein identification are generally performed using DDA or DIA workflows.

Q4. How long does an MRM project usually take?

A typical project requires approximately 3–6 weeks, depending on target peptide selection, standard peptide preparation, sample number, method development requirements, and instrument scheduling.

Contact Us

MRM-based LC-MS/MS quantification provides a targeted approach for sensitive and reproducible measurement of predefined protein and peptide targets.

Contact MtoZ Biolabs with your target proteins, sample types, and quantitative objectives to establish an appropriate targeted quantification workflow.

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