Luminol

Luminol (CAS No.: 521-31-3) is a small-molecule cyclic diacyl hydrazide widely utilized in biomedical research for its robust chemiluminescent properties, emitting characteristic blue light around 425 nm upon oxidation. This compound undergoes light-emitting reactions in the presence of oxidizing systems such as hydrogen peroxide coupled with peroxidase enzymes, including horseradish peroxidase, and can also be activated by transition metals, making it a sensitive probe for redox-related biochemical processes. Its chemiluminescence is influenced by pH and can be enhanced by phenolic cofactors, enabling its application in assays that monitor enzyme activity, reactive oxygen species generation, and oxidative signaling pathways. In biological research, luminol serves as a versatile detection reagent in immunoassays, reporter gene systems, and studies of cellular oxidative burst, particularly in immune cell function and inflammation models. Although not a direct pharmacological modulator of a defined molecular target, it is extensively employed as a functional probe to investigate peroxidase-mediated reactions and oxidative stress mechanisms, typically exhibiting activity in assay-dependent nanomolar to micromolar ranges. Experimental usage spans in vitro biochemical assays and cell-based systems, as well as ex vivo and in vivo imaging applications, with concentrations or dosing regimens adjusted according to specific experimental conditions and detection sensitivity requirements.