iTRAQ Labeling Technology Mechanism and Its Advantages
In proteomics research,high-throughput quantitative analysis of multiple sampleshas always been a focus for researchers. With the development of mass spectrometry technology, the iTRAQ labeling technique is widely applied in studying disease mechanisms, exploring drug action mechanisms, and screening biomarkers due to itssensitivity, accuracy, and ability to process multiple channels in parallel.,
I. Working Mechanism of iTRAQ Labeling Technology
1. Principle
iTRAQ is a proteomics quantitative technique based onisotope labeling. The core of its quantification lies in chemically labeling peptides from different sample sourceswith equal mass, releasing distinct 'reporter ions' during MS/MS fragmentation, thereby achieving relative quantification of multiple samples.
2. Workflow
(1) Protein Extraction and Digestion: Proteins from multiple samples are extracted and uniformly digested into peptides using trypsin.
（2）iTRAQ Reagent Labeling: Each sample is chemically labeled with different iTRAQ reagents (such as 114, 115, 116... up to 8 or 10 channels).
（3）Sample Mixing: The labeled peptides are mixed into one sample for mass spectrometry analysis.
（4）LC-MS/MS Analysis: In the MS1 stage, peptides are indistinguishable due to equal mass tags. In the MS/MS stage, tags release reporter ions of specific mass, and their intensity reflects the relative abundance of peptides in the samples.
（5）Data Analysis and Quantification: The intensity ratios of reporter ions are used to compare protein expression differences between samples.
II. Core Advantages of iTRAQ Labeling Technology
1. Multi-channel Parallel Quantification, Enhancing Efficiency
One of the highlights of iTRAQ is its ability to achievesynchronous quantitative analysis of up to 8 channels (or even 10 channels) of samples. Compared to single-sample processing methods, iTRAQ significantly enhances experimental efficiency and reduces systematic bias caused by different batch operations.
2. Synchronous Analysis, Reducing Experimental Bias
Since all samples areuniformly mixed, processed, and analyzedafter labeling, the iTRAQ technique ensures high uniformity in the experimental process, effectively reducing differences in sample handling and improving data comparability and consistency.
3. High Sensitivity, Suitable for Complex Samples
iTRAQ labeling combined with high-resolution mass spectrometers (such as Orbitrap, QTOF) can detect and quantifylow-abundance proteins, membrane proteins, and tissue-specific proteins, making it widely applicable to complex sample types such as plasma, brain tissue, tumor tissue, etc. Biotech companies like BGI provide high-coverage proteomic data acquisition through nanoscale LC-MS/MS systems and optimized pre-processing workflows, aiding researchers in discovering key regulatory factors.
4. Adaptable to Multi-dimensional Bioinformatics Analysis
Data generated by iTRAQ labeling has a solid foundation for normalization, facilitating integration with multi-omics (such as metabolomics, transcriptomics) for system biology research and network pathway exploration.
Baitai Parker Biotechnology: Supporting High-quality iTRAQ Experimental Design and Execution
Although iTRAQ technology performs excellently in quantitative proteomics, it requires high precision in experimental operations, mass spectrometry platforms, and data analysis capabilities.Baitai Parker Biotechnologyprovides one-stop iTRAQ quantitative services, covering:
- Sample quality assessment and standardization
- Optimization and quality control of isotope labeling
- Data acquisition based on Orbitrap high-resolution mass spectrometry platform
- Differential protein screening, GO/KEGG functional enrichment, PPI network analysis, and other bioinformatics support
Combining multi-omics integration capabilities, we offercustomized research solutions such as iTRAQ + metabolomics joint analysis and iTRAQ + phosphorylation modification studies.
Despite the rise of new labeling technologies like TMT in recent years,iTRAQ Labeling Technologycontinues to maintain its position with mature, stable, and multi-channel parallel characteristicsin specific research scenarios. Baite Pike Biotechnology provides professional technical support and flexible service solutions to help advance your research projects quickly and achieve successful publications. Contact us to build an efficient proteomics research platform together.
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