(organic chemistry) Any salt or ester of the quinoline carboxylic acid 2,2'-biquinoline-4,4-dicarboxylic acid; the sodium salt is a colourimetric reagent used to detect proteins

(organic chemistry) Of or pertaining to bicinchoninic acid or its derivatives

(organic chemistry) A dicarboxylic acid, composed of two carboxylated quinoline rings, that is used for protein assay