What is protein quantification analysis?

Protein Quantification refers tothe experimental process of measuring the protein content or relative abundance in a sample, widely used in fields such as proteomics, disease biomarker research, and drug mechanism analysis. Through quantification analysis, researchers can reveal changes in protein expression under different conditions, thereby deepening the understanding of cell functions, disease mechanisms, and even drug response processes.

 

I. Main Types of Protein Quantification

1. Total Protein Quantification

This is the most basic protein quantification method, aimed at measuring thetotal amount of protein in the sample, often used for sample standardization or pre-experiment treatment. Common methods:

(1) BCA Assay (Bicinchoninic Acid Assay): Sensitive to protein concentration, suitable for various sample types.

(2) Bradford Assay: Fast and efficient but sensitive to certain buffer systems (e.g., SDS).

(3) Lowry Assay: Highly sensitive, but relatively complex to operate.

 

2. Relative Quantification

Comparing theexpression changes of the same protein in different samples, such as differences between control and experimental groups. Main strategies:

(1) Mass spectrometry-based labeling methods (e.g., TMT, iTRAQ): Use isotope labels for multi-sample comparison with high precision.

(2) Label-Free Quantification: Does not require chemical labeling, suitable for large-scale sample screening.

 

 

3. Absolute Quantification

Compared to relative quantification, absolute quantification seeks higher precision by using standard substances (peptides or proteins) of known concentration to calculate the real content of target proteins in the sample, expressed in units like ng/mL or copy number. Main methods:

(1) AQUA Method: Synthesizes stable isotope-labeled peptides as internal standards, suitable for targeted protein validation;

(2) QconCAT: Expresses multiple peptide segments in tandem to form internal standard proteins, allowing for the quantification of multiple targets at once;

(3) Standard Curve Method: Establishes a relationship curve between standard concentration and peak area to indirectly calculate target concentration.

For high-precision research such as clinical biomarker validation and drug target screening, Biotech provides targeted MRM/SRM/PRM protein quantification analysis services, enabling absolute quantification of single or multiple proteins for FDA/CFDA related data support.

 

II. Selection of Mass Spectrometry Platforms for Protein Quantification Analysis

Modern protein quantification has fully entered the era of high-resolution mass spectrometry (HRMS). Popular platforms include:

• Orbitrap (Thermo series): High resolution and sensitivity, the first choice for peptide quantification

• Q Exactive series: Supports parallel reaction monitoring (PRM), suitable for high-throughput targeted quantification

• TripleTOF (SCIEX): High efficiency in data-independent acquisition (DIA), suitable for constructing protein maps

Biotech owns multiple Orbitrap Fusion Lumos and Q Exactive HF-X systems, combined with automated preprocessing systems and AI-level data analysis algorithms, ensuring protein quantification datahigh repeatability, high coverage, and low coefficient of variation。

 

III. Application Scenarios: Scientific and Industrial Value of Protein Quantification Analysis

Protein quantification is not only crucial in basic research but is also gradually expanding into sectors such as biomedicine, agriculture, environmental science, synthetic biology, and more.

1. Disease Mechanism Research

Quantitative comparison of protein expression profiles in healthy and diseased states to explore regulatory networks, key enzymes, inflammatory factors, etc.

 

2. Drug Development and Mechanism Analysis

By analyzing protein expression changes before and after treatment, potential targets can be identified, and drug action pathways can be constructed.

 

3. Clinical Biomarker Development

Combining metabolomics and transcriptomics to screen for protein biomarkers with clinical significance for early screening/prognosis.

 

4. Synthetic Biology and Metabolic Engineering

Quantitatively regulate the expression of key enzymes in synthetic pathways to enhance product yield, achieving precise control of metabolic flow.

 

IV. Advantages of Biotech's Protein Quantification Services

We are committed to providing customers with a 'high coverage, high precision, high cost-effectiveness' comprehensive protein quantification solution:

• Flexible selection of multi-platform quantification schemes (Label-Free/TMT/MRM, etc.)

• Covering a wide range of sample types including human, animal, microorganisms, plants, exosomes, and more

• Full-process quality control (QC) and professional bioinformatics support

• Capable of integrating with metabolomics, transcriptomics, phosphorylation, and other multi-omics analyses

 

Protein quantification analysis is not just a technique but a scientific approach to deeply understanding life systems. As mass spectrometry technology and data analysis continue to evolve, it will play an increasingly crucial role inprecision medicine, molecular diagnostics, synthetic biologyand other frontier fields. If you are exploring protein expression changes, biomarker discovery, mechanism research, or efficacy evaluation, feel free to contact Biotech. We will provide professional platforms and services to support your research journey!

 

Biotech - A leading service provider in biological product characterization and multi-omics mass spectrometry detection

 

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