Thaumatin is a sweet tasting protein with an intensity approximately 1,600 - 2,000 times greater than sucrose (it is even about 7 times sweeter than stevia). Some sources say that it is approximately 3000 times sweeter than sucrose. The thaumatin protein consists of a single polypeptide chain of 207 residues, and It elicits a sweetness 100,000 times higher than that of sucrose on a molar basis even at a low concentration of 50 nM.