Certain features of will be down for maintenance Saturday afternoon/evening, February 24th starting at 3:00 pm CT until 9:00 pm CT.

Please note that you still have telephone and email access to our local offices. We apologize for any inconvenience.

Protein Quantitation

As a traditional technique, protein quantitation is a field that Sigma has long supported with excellence. Protein quantitation may be accomplished through a number of methods, the most reliable of which include the BCA (bicinchoninic acid) assay and the Bradford assay. Alternative protein quantitation methods include the Lowry assay for protein quantitation and derivitization of N-terminal amines. In addition to traditional protein quantitation methods, Sigma also offers innovative QuantiPro, the high sensitivity protein quantitation kit. Sigma-Aldrich is also now pleased to offer the Sciex iChemistry Solutions line of tagging reagents for quantitative proteomics.