May be the same protein as pentadin
Brazzein is a small protein isolated from a West African plant, Pentadiplandra brazzeana Baillon)
Brazzein is sweet, with a slight licorice-like cooling effect in the mouth at high sweetness levels. It is up to 2000 times as sweet as sucrose on a weight basis. Like all of the protein sweeteners, its onset is slow, and the sweetness lingers for some time.
Brazzein is a protein, so it provides 4 calories per gram. But its potency is so high that, at use levels, it would provide 1 calorie or less.
Brazzein is remarkably heat stable. It is very water-soluble.
Brazzein is a protein, so it is expected that it would be digested just as any other dietary protein is. It has been used as a sweetener for centuries in its native habitat.
Natur Research Ingredients is a company that is working to develop brazzein as a commercial product.