MadSci Network: Chemistry |
Unmeltable chocolate is a fact! There are ways to make a heat resistant (tropicalized or non-waxy no-melt chocolate) chocolate. Some of the ways I can think of are by increasing the melting point of the fat used (the cocoa butter), using a cocoa butter substitute (a different, higher melting fat or a specially designed "structured lipid"), or by using some other high melting point additive. There are chocolate coatings available that melt at different temperature ranges. These are not real chocolate, but do taste chocolatey. They range from low melting coatings in products like Magic Shell (that oily stuff that is liquid at room temperature, but freezes to a hard shell on your ice cream) to high melting coatings used on small chocolate candies, keeping them from melting on your fingers. The chocolate bar you probably heard about in the media was the Desert Bar, made by Hershey's for the soldiers in Operation Desert Shield in December 1990. It was a chocolate bar designed to withstand heat up to 140°F (although I have found other references that state as high as 150° F). I've heard that the bar was made with some type of egg white powder additive, but I am not sure about this. (The formulation is most likely proprietary information within Hershey's.) The soldiers were a test market for the bar. An Army spokesperson said the chocolate candy was good, but I beg to differ. The Hershey's Desert bar was discontinued in 1991. This is probably because your body is around 98.6 degrees and the bar wouldn't melt in your mouth. Mmmm... there's nothing like chewing on a bar of crunchy chocolate flavored stuff that doesn't melt. Yuck! People like natural chocolate because of its mouthfeel - the way it feels on the tongue and within the mouth. Real chocolate melts in a range that is right around the temperature of the mouth, giving it the desirable smooth texture and slow release of flavor. While a heat resistant chocolate has its benefits, I'll stick to licking that delicious, chocolatey goo off of my fingers in the summer. I hope that answers your question. Laura Lebak Graduate Research Assistant University of Wisconsin Food Science 1605 Linden Dr. Madison, WI 53706 email: lllebak@students.wisc.edu Laura's Page
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