more exotic food additives

Taste modifiers:

• sweetness inhibitors — gymnemic acids, hodulcine, lactisole, ziziphin
• sweet proteins — brazzein, curculin, mabinlins, monellin, pentadin, thaumatin
  • curculin — causes water and sour solutions to be perceived as sweet
  • thaumatin — its sweetness effect only works on some primates, including humans
• bitterness inhibitors
• things that cause sour flavors to be perceived as sweet — curculin and miraculin

More on taste modifiers. [1]