Label-free protein quantification is a mass spectrometry-based method for identifying and quantifying relative changes in two or more biological samples instead of using a stable isotope-containing compound to label proteins. There is no limit on the number of samples in label-free protein quantification and it’s in principle applicable to any kind of sample, including materials that cannot be directly metabolically. It is ideal for large-sample analyses in clinical screening or biomarker discovery experiments. https://www.creative-proteomics.com/
Proteomics and Metabolomics