Tris(hydroxymethyl)aminomethane hydrochloride (Tris HCl) of ultrapure buffer quality for molecular biology with low UV absorption, DNase, RNase, Protease not detected. Tris/Tris HCl is a commonly used buffering system for biopharmaceutical manufacturing, cell culture, diagnostics and molecular biology. Tris(hydroxymethyl)aminomethane hydrochloride (Tris HCl) of ultrapure buffer quality for molecular biology with low UV absorption, DNase, RNase, Protease not detected. Tris/Tris HCl is a commonly used buffering system for biopharmaceutical manufacturing, cell culture, diagnostics and molecular biology.