RPI offers the highest purity D-Luciferin Potassium Salt for a wide range of bioluminescent applications. Produces bioluminescence when oxidized by firefly luciferase. Allows highly sensitive bioluminescent measurements. Common research uses reporter gene assays, ATP assays, whole animal studies, DNA sequencing and others. Our product is specially purified and tested extensively to ensure the highest signal and reproducibility with low background and sensitivity. Guaranteed purity is determined by both standard HPLC and Chiral HPLC methods. Protect from light and moisture.