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Aspartame is an artificial non-saccharide sweetener that is about 200 times greater than sucrose or table sugar. It is used as a sugar substitute in some foods and beverages.

Aspartame is a methyl ester of the dipetide of the natural amino acids, L- aspartic acid and L- phenylalamine. The taste of aspartame and other artificial sweeteners differ from that of table sugar in times of onset and how long the sweetness of the aspartame lasts.

The sweetness of the aspartame lasts longer than sucrose, so it is often blended with other artificial sweeteners like acesulfame potassium to produce overall taste like sugar.

The stability of aspartame when dissolved in water depends mainly on the PH. It is most stable at PH 4.30 where its half life is nearly 300 days but at PH7, its half life is only a few days.

Aspartame finds application in the production of soft drinks which have PH in the range of 3 and 5 where aspartame is reasonably stable. On the other hand, if the products may require longer shelf life such as in syrups for fountain beverages, aspartame is sometimes blended with a more stable sweetener such as saccharin.