Often protein quantification is performed by measuring absorbance at 280nm. However, results might be influenced by buffer or source constituents.

An alternative to A280 quantification is colourimetric protein assays.

In this method, reagents and proteins are mixed to produce a colour change, which is used to measure the amount of proteins present.

Unknown sample concentrations are calculated using a measured standard curve. Apps to measure four commonly used colourimetric protein assays are now available on DropSense16.