Low-Abundance Peptide Quantification Service

Overview

Peptides are biomolecules composed of amino acids linked by peptide bonds and are widely present in biological samples. Some biologically important peptides occur at very low concentrations under natural conditions and can be strongly affected by high-abundance proteins and complex sample matrices.

Low-abundance peptide quantification uses mass spectrometry to detect and measure peptides present at low levels. By analyzing peptide-specific LC-MS/MS signals together with optimized acquisition and quantification strategies, researchers can improve the detection of low-abundance peptides and compare their abundance across different samples or biological conditions.

Service at MtoZ Biolabs

The key challenge in low-abundance peptide quantification is to improve the distinction between target peptide signals and background interference in complex biological samples.

MtoZ Biolabs applies optimized low-molecular-weight peptide enrichment strategies to reduce interference from high-molecular-weight proteins and complex sample matrices. Combined with high-resolution LC-MS/MS analysis, this approach helps improve peptide detection depth and quantitative reliability.

Depending on the research objective, multiple quantification strategies can be applied:

• Label-Free Quantification
• Isotope-Labeled Quantification
• Targeted Mass Spectrometry Quantification
• Stable Isotope-Labeled Internal Standard-Based Absolute Quantification

Analysis Workflow

1. Sample Extraction and Low-Molecular-Weight Peptide Enrichment

Naturally occurring peptides are extracted according to sample characteristics. Ultrafiltration and other enrichment approaches can be used to enrich low-molecular-weight peptide fractions and increase the likelihood of detecting low-abundance targets.

2. Sample Purification and Cleanup

Desalting and purification procedures are applied to reduce interference from salts, lipids, and other matrix components that may affect mass spectrometry performance.

3. LC-MS/MS Analysis

Samples are analyzed using high-resolution Orbitrap mass spectrometry platforms. Appropriate acquisition modes are selected according to project objectives to obtain peptide mass spectrometry data.

4. Data Processing and Quantitative Analysis

Professional software is used for peptide identification, signal analysis, and abundance comparison to characterize changes in low-abundance peptide levels.

Service Advantages

• Optimized low-molecular-weight peptide enrichment strategies for low-abundance endogenous peptides
• High-resolution Orbitrap mass spectrometry for reliable peptide identification
• PRM/MRM/SRM targeted strategies to improve sensitivity for low-abundance peptide quantification
• Optimized data analysis workflows to improve confidence in weak-signal peptide identification

Applications

1. Neuropeptide and Hormone-Related Peptide Research

Analyze changes in low-abundance regulatory peptides under different physiological conditions.

2. Disease-Associated Peptide Research

Compare low-abundance peptide profiles between disease and control samples.

3. Biomarker Discovery

Identify low-abundance peptide candidates with potential value for further biological or translational research.

4. Protein Degradation Studies

Analyze low-abundance peptide fragments generated during protein processing and degradation.

Sample Submission Requirements

Item	Recommended Requirements
Sample Types	Biological fluids, cell samples, tissue samples, and other naturally derived biological samples
Sample Status	Dry powder samples are preferred. Solution samples should be protected from repeated freeze-thaw cycles.
Sample Amount	For complex low-abundance peptide samples, a total peptide amount of approximately 20–50 μg or above is recommended.
Solution Sample Requirements	A total protein amount above 20 μg and a concentration above 0.6 μg/μL are recommended.
Sample Purity	High concentrations of salts, detergents, lipids, and other components that may interfere with ionization should be minimized.
Sample Transportation	Dry powder samples should be securely sealed for shipment. Solution samples are recommended to be shipped on dry ice.

Deliverables

1. Raw Mass Spectrometry Data Files

2. Total Ion Chromatogram (TIC) Plots

3. Peptide Identification Results

4. Complete Peptide Sequence Information

5. MS/MS Spectrum Matching Results

6. Peptide Length and Scoring Distribution Analysis

7. Protein Origin Annotation of Identified Peptides

8. Functional Enrichment Analysis, Available upon Request

FAQs

Q1. Why are low-abundance peptides more difficult to detect than other peptides?

Low-abundance peptides are present at relatively low concentrations in biological samples, and their mass spectrometry signals can be masked by strong signals from high-abundance proteins, peptides, and complex matrix components.

In addition, low-abundance peptides are more susceptible to degradation, sample-processing losses, and matrix effects, which can further reduce detectable signal intensity. Therefore, sensitive mass spectrometry analysis and optimized sample preparation are often required.

Q2. How long does the analysis take?

Low-abundance peptide quantification typically takes approximately 3–4 weeks. The actual turnaround time depends on sample number, sample condition, instrument scheduling, and downstream data analysis requirements.

Contact Us

Need to determine whether your samples are suitable for low-abundance peptide quantification?

Contact our technical team for recommendations based on your sample type and research objectives.