Lowry protein assay

TL;DR: This assay is very reproducible and rapid with the dye binding process virtually complete in approximately 2 min with good color stability for 1 hr with little or no interference from cations such as sodium or potassium nor from carbohydrates such as sucrose.

TL;DR: This new method maintains the high sensitivity and low protein-to-protein variation associated with the Lowry technique and demonstrates a greater tolerance of the bicinchoninate reagent toward such commonly encountered interferences as nonionic detergents and simple buffer salts.

TL;DR: The original Lowry method of protein determination has been modified by the addition of sodium dodecyl sulfate in the alkali reagent and an increase in the amount of copper tartrate reagent to be used with membrane and lipoprotein preparations without prior solubilization or lipid extraction.

TL;DR: Under the new conditions there is direct proportionality between absorbance at 650 nm and weight of protein within the range 15–110 μg.

TL;DR: The Lowry protein assay is a sensitive but highly nonspecific procedure that has been modified so that protein can be assayed in the presence of interfering chemicals.