|Monellin is a natural sweetener which is isolated from the tropical serendipity berry, Dioscoreophyllum cumminsii. Monellin is found in the fruit of the plant and is a protein with a molecular weight of about 11,500 daltons. Its relative sweetness is about 2000 that of sugar.|
However, its stability is poor and in carbonated soft drinks the sweetness is lost after only a few hours. Another disadvantage of monellin is that the sweet taste is manifested a few seconds after consumption, and remains, to acertain degree, for about an hour.