The Science Behind Ice Cream That Resists Melting   

• Ice cream may be summer’s favorite treat, but it has one unavoidable flaw: it melts too quickly. A scoop is perfect for a few minutes, then drips down the cone and over your hands. Food scientists have long wondered whether there’s a way to keep ice cream firm longer without compromising the creamy texture and flavor that people love. Part of the answer lies in the microscopic structure of ice cream. Each scoop is a delicate mix of ice crystals, fat, sugar, and air. During production, machines churn the mixture as it freezes, keeping crystals small and the texture smooth. Problems arise when ice cream warms slightly during shipping or storage and is refrozen. Larger ice crystals form, giving the dessert a grainy, icy texture. To slow that process, manufacturers already add stabilizers such as guar gum or carrageenan. A newer approach focuses on polyphenols, natural compounds found in tea, grapes, and berries. In laboratory experiments, food scientist Cameron Wicks discovered that tannic acid, a type of polyphenol, binds with fats and proteins to form a network that slows the flow of melting ice. This helps ice cream hold its shape and reduces dripping at room temperature. Still, no stabilizer can defy physics. A cone left in the sun for hours will not remain solid; it may simply slump more slowly into a pudding-like consistency. Polyphenols also do not keep the dessert cold, so over time, all you’ll have left is a rubbery, lukewarm mush. For now, polyphenols may be most useful in helping ice cream survive long-distance shipping and storage. Whether ultra-stable, high-polyphenol scoops will ever appear at local ice cream stands remains an open question. May For The Teen Times teen/1756433383/1613367687