Also available in 1 mL, 10 mg, 25 mg, 50 mg, 200 mg, 500 mg and bulk. Please contact Fisher for quotes. D-Luciferin Sodium is a heterocyclic light-emitting compound and natural ligand for luciferase used to detect cell activity. The salt form of luciferin dissolves in water or other typical buffers. Purity 99.65%