D-Luciferin Potassium Salt (4,5-Dihydro-2-(6-hydroxy-2-benzothiazolyl)-4-thiazolecarboxylic acid, potassium salt), 100mg, is a bioluminescence reagent used in various biochemical and molecular biology applications. It is commonly used in assays for detecting and quantifying light produced by luciferase enzymes in firefly bioluminescence reactions. The potassium salt form is highly soluble, making it ideal for use in luciferase-based reporter assays, cell viability assays, and ATP detection. This compound is essential for research in gene expression, cellular activity, and biochemical assays requiring light detection as a readout. The 100mg size is ideal for small-scale experiments and testing.