MtoZ Biolabs' serum protein digestion kit is specifically designed for mass spectrometry sample preparation, offering a standardized and highly reproducible protein digestion workflow tailored for proteomic research involving complex biofluids like serum. The kit is pre-formulated with an efficient buffer system and high-quality protease reagents, fully compatible with NanoLC-MS/MS platforms, and is widely applicable to biomarker discovery, clinical cohort studies, and low-abundance protein enrichment.
Serum is one of the most commonly used biological fluids and plays a pivotal role in biomarker screening, drug target identification, and translational clinical research. Compared to plasma, serum is devoid of fibrinogen after coagulation, yet it still presents a high degree of proteomic complexity. It contains a large amount of high-abundance proteins, such as albumin and immunoglobulins, which constitute the majority of total protein content. This poses a major challenge in detecting low-abundance functional proteins. To better mine potential proteomic information in serum, scientific research demands higher standards for sample preprocessing quality.
In proteomics research, protein digestion is a critical step in sample preparation. Only through thorough, uniform, and reproducible enzymatic digestion can protein samples generate optimal peptide fragments for subsequent mass spectrometry detection and quantitative analysis. Due to the unique nature of serum samples, traditional protein digestion methods often suffer from poor solubility, low digestion efficiency, and interference from high-abundance proteins. Therefore, establishing a standardized digestion protocol that accommodates the complex background of serum, simplifies the workflow, and improves efficiency has become an urgent challenge in current proteomics studies.
To address this need, MtoZ Biolabs has developed the serum protein digestion kit that can be specifically for efficient and stable enzymatic digestion of serum samples, integrating MtoZ Biolabs' extensive expertise in mass spectrometry sample preprocessing and employs high-purity, MS-grade trypsin for digestion, along with an optimized buffer system for denaturation, reduction, and alkylation. This ensures full protein unfolding and exposure of cleavage sites, thereby improving digestion efficiency and peptide coverage.
Product Features
- Specifically designed for serum samples with high protein complexity
- Pre-formulated reagents to minimize manual variation
- Compatible with NanoLC-MS/MS with no need for additional desalting or concentration steps
- Each batch undergoes QC-verified digestion performance to ensure data consistency
With the combination of a standardized workflow and high-quality reagents, users can efficiently perform high-quality serum protein digestion, ready for direct downstream LC-MS/MS analysis.
Product Notes
1. Lysis buffer 1 should be freshly prepared before use by mixing Lysis buffer A and B components.
2. Process the prepared samples immediately or aliquot and store at -80 °C.
3. The serum protein digestion kit is capable of processing 8 samples.
4. Avoid foam formation during operation, as it may interfere with protein binding efficiency.
5. It is recommended to use low protein-binding centrifuge tubes to collect the eluates to prevent sample loss due to adsorption of low-abundance proteins to the tube walls.
6. Protein concentrations may vary between different serum batches; it is advisable to perform a pilot experiment to determine the optimal dilution ratio and incubation time.
Product Details
|
Product Details |
Size |
Storage Conditions |
|
Wash buffer 1 |
2 mL×1 |
RT |
|
Wash buffer 2 |
8 mL×1 |
RT |
|
Lysis buffer 2 |
1.2 mL×1 |
RT |
|
Elution buffer 1 |
100 μL×1 |
RT |
|
Elution buffer 2 |
1 mL×1 |
RT |
|
Lysis bufferA |
3.75 mg×1 |
RT |
|
Lysis bufferB |
1 mL×1 |
RT |
|
Beads |
0.8 mg×1 |
4℃ |
|
Enzymes |
4 μg×1 |
-20℃ |
Protocol
The entire workflow can be performed under standard laboratory conditions without the need for specialized equipment. The following are the recommended steps:
1. Sample Preparation
Pipette 100-200 μL of serum sample into a clean EP tube (dilution may be applied to optimize precipitation efficiency).
2. High-Abundance Protein Removal
(1) Take an appropriate amount of pre-washed magnetic beads and add them to the corresponding volume of serum sample.
(2) Mix thoroughly and incubate on a rotator for 10-15 minutes.
(3) Use a magnetic stand to separate the beads and wash them.
(4) Elute the low-abundance proteins from the beads.
3. Digestion of Low-Abundance Proteins
(1) Dilute the protein solution with digestion buffer and perform overnight digestion.
(2) After digestion, collect the peptide solution using the provided elution buffer.
4. Digestion Termination and Sample Cleanup (Optional)
If necessary, terminate the reaction or perform desalting and cleanup steps based on experimental requirements using the optional termination buffer or downstream processing modules. The resulting peptides can be directly used for LC-MS/MS or other mass spectrometry analyses.
MtoZ Biolabs also provides comprehensive one-stop services, including sample desalting, peptide enrichment, and mass spectrometry analysis, saving experimental cycles.
Features and Benefits
- Optimized for serum matrix to eliminate interference from high-abundance proteins
- Mass spectrometry-grade compatibility, adaptable to multiple platforms
- High batch-to-batch consistency, ideal for clinical cohort studies
- User-friendly protocol minimizing human error
Applications
- Proteomics research on clinical cohort serum samples
- Enzymatic digestion of small-volume serum samples (≤10 µL)
- Pre-treatment for targeted analysis of modified proteins (e.g., phosphorylation, glycosylation)
- Serum protein expression profiling in drug-treated animal models
- Discovery and validation of serum protein biomarkers for disease
FAQs
Q1: What Are the Key Considerations for Serum Sample Storage and Handling?
A1: To ensure protein stability in serum, samples should be stored at -20°C or -80°C and protected from repeated freeze-thaw cycles to prevent protein degradation or denaturation. Prior to use, serum samples should be thawed at room temperature and thoroughly mixed to ensure homogeneity. To minimize variability, it is recommended to use freshly thawed serum for each experiment to achieve optimal analytical performance.
Q2: What Types of Serum Samples Are Compatible with the Kit?
A2: The MtoZ Biolabs’ serum protein digestion kit is broadly compatible with various serum samples, including those from human subjects, animal models, and clinical cohorts. It is suitable for processing both healthy and disease-state serum, offering high-efficiency digestion and generating high-quality peptide products for downstream analysis.
Q3: How Should Digested Products Be Purified and Analyzed Downstream?
A3: After digestion, peptide products can be directly subjected to mass spectrometry (e.g., LC-MS/MS) for protein identification, quantification, or post-translational modification (PTM) analysis. We recommend purifying the digested peptides using solid-phase extraction (SPE) or liquid chromatography to obtain high-purity peptides suitable for sensitive downstream applications.
