Tris(hydroxymethyl)aminomethane hydrochloride (Tris HCl) of ultrapure buffer quality for biochemistry and enzymology with low UV absorption. 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 biochemistry and enzymology with low UV absorption. Tris/Tris HCl is a commonly used buffering system for biopharmaceutical manufacturing, cell culture, diagnostics and molecular biology.