COLORING COMPOSITION CONTAINING L-DOPA AND L-ARGININE AND FORMING A NON-COVALENT DERIVATIZATION COMPLEX

摘要

A natural coloring composition for coloring materials, and methods of its use. The coloring composition comprises a natural precursor aromatic ring molecule such as L-DOPA that is oxidatively oligomerized or polymerized in the presence of arginine and an activator, such as a salt or an enzyme, wherein the L-DOPA and the amino acid form a specific non- covalent interaction. The natural coloring composition can also include a buffer, colorant, stabilizer, and/or thickening agent, and can comprise one or two inactive solutions that are combined to form an active coloring composition.