Can flow cytometry perform absolute quantification of proteins? I want to detect the molecular count of two membrane proteins on a cell surface. What are some good methods?
Flow cytometry is a technique used for analyzing and sorting cells. It can qualitatively detect markers on the cell surface or within cells, but it is typically used for relative quantification, i.e., comparing the relative expression levels of proteins between different samples. To achieve absolute quantification of proteins, especially membrane proteins on the cell surface, the following methods can be employed:
1. Mass Spectrometry:
Mass spectrometry can be used for absolute protein quantification, such as multiple reaction monitoring (MRM) or parallel reaction monitoring (PRM). These methods combine mass spectrometry with known concentrations of standard substances, allowing you to measure the absolute molecular number of proteins.
2. Single-Molecule Techniques:
For example, single-molecule fluorescence microscopy or single-molecule localization microscopy. These methods allow you to observe and count cell surface proteins at the single-protein level. However, these techniques usually require high-end microscopy equipment and highly precise analysis, thus potentially requiring more time and resources.
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