Ice cream is a beloved summer treat, but its tendency to melt quickly in warm weather can lead to sticky fingers and disappointment. Scientists have been exploring ways to make ice cream more resilient to heat, and a breakthrough involving polyphenols—antioxidant molecules found in fruits—has shown promise.
Japanese manufacturer Kanazawa Ice created ice pops and soft-serve ice cream that resisted melting, thanks to the addition of polyphenols. Food scientist Cameron Wicks, then at the University of Wisconsin, investigated how these molecules stabilise ice cream. She experimented with cream mixtures containing tannic acid, a type of polyphenol, at concentrations of 0.75%, 1.5%, and 3%. The higher concentrations caused the cream to thicken and gel, with the 3% mixture becoming firm enough to cut with a knife or hold its shape when inverted.
Under a microscope, Wicks observed that the tannic acid interacted with proteins in the cream, creating a supportive network that prevented fat globules from merging. This structure likely explains why ice cream made with polyphenols resists melting: the fats cannot run off as the cream warms. However, this does not defy physics; the ice cream eventually becomes pudding-like in texture but retains its shape.
While polyphenols could join existing stabilisers like carrageenan and guar gum to improve ice cream's resilience during transport, the novelty of a non-melting dessert may challenge consumer expectations. Whether such products will appear at ice cream stands remains uncertain, but the research offers a fascinating glimpse into the science of frozen treats.
