Fast Green FCF (CAS 2353-45-9)

Fast Green FCF, with the chemical formula C37H34N2Na2O10S3, is a synthetic triarylmethane dye that is extensively used in molecular biology and biochemistry research for staining and quantifying proteins. As a water-soluble dye, it binds to proteins primarily through electrostatic interactions and van der Waals forces, which makes it particularly useful in applications where it is critical to observe protein bands after electrophoretic separation in polyacrylamide gels. Fast Green FCF is less sensitive than other dyes like Coomassie Brilliant Blue, but it is preferred in certain scenarios due to its rapid binding properties and minimal interference with subsequent biochemical analysis. Importantly, it does not fix proteins in gels, which allows for efficient protein recovery post-staining. This dye is also utilized in the colorimetric determination of protein concentration in solution, where it forms a complex with protein molecules, altering its absorbance properties in a measurable way that correlates with protein amount. In research settings, Fast Green FCF is particularly valued for its compatibility with mass spectrometry, as it does not mask peptide signals. Moreover, its bright green color provides clear contrast, making it ideal for visualizing and documenting results. Fast Green FCF has also found applications in environmental sciences as a tracer dye due to its high visibility and low toxicity, facilitating studies in water flow and pollutant tracking.