X GlcA Sodium Salt [5 Bromo 4 Chloro 3 indolyl β-D-glucuronic acid, sodium salt trihydrate], 100 mg is a chromogenic substrate used for detecting β-glucuronidase activity in biochemical assays. Upon hydrolysis by the enzyme, the substrate produces a blue color, making it ideal for enzyme activity detection in microbiological and biochemical studies. It is particularly useful for identifying microorganisms capable of hydrolyzing glucuronic acid. X GlcA Sodium Salt is widely used in genetic studies, enzyme characterization, and microbial screening, providing a reliable method for detecting β-glucuronidase in recombinant microorganisms or natural microbial populations.