TMT Quantitative Mass Spectrometry

TMT (Tandem Mass Tag) is a technology widely used in quantitative proteomics. TMT is a chemical labeling method used for quantitative proteomics. Peptide segments from different samples are labeled with different isotopic tags. These tags have the same mass in the mass spectrum, but when they are decomposed in the mass spectrometer, they release different reporter ions. By comparing the intensity of these reporter ions, the relative abundance of peptide segments in different samples can be determined.

Advantages

1. Multiplexing

Multiple samples can be analyzed simultaneously, accelerating the experimental process and reducing experimental variability.

2. Accuracy

The use of specific labels can improve the recognition accuracy of peptide segments.

3. Wide Dynamic Range

It's suitable for detecting proteins with a large difference in abundance.

Limitations

1. Cost

Compared with label-free methods, chemical labeling may increase the cost of the experiment.

2. Ratio Compression

It may be caused by incomplete ion isolation or co-isolation of interfering species.

3. Sample Processing

More sample processing steps are required, which may lead to sample loss or introduce experimental bias.

Applications

TMT technology is widely used in proteomics research, especially when quantitative comparisons of samples under different conditions or treatments are needed, such as disease research, drug mechanism of action research, etc.