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Diet Pepsi formula getting a sweetener tweak

NEW YORK — Diet Pepsi is tweaking its formula to stay sweet a little longer.

PepsiCo Inc. is testing new artificial sweeteners that let the soda keep its taste for a longer period of time. The problem is that the current sweetener used in the soda — aspartame — loses its potency faster than high fructose corn syrup, the sweetener in most regular sodas.

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A person with knowledge of the situation says the company had considered importing versions of Diet Pepsi sold in other countries to the United States. But now it’s testing other sweetener mixes, with a new version set to come out as soon as next year.

The new version will use the same formula that creates Diet Pepsi’s overall taste, according to the person, who requested anonymity because she wasn’t authorized to speak publicly. But it will use a mix of artificial sweeteners, including acesulfame-potassium, or ace-K, that has a longer shelf life.

Aspartame on its own is more sensitive to heat.

In a statement, PepsiCo said it has no plans to change the taste formula of Diet Pepsi.

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