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Melty Yum. The Chemistry of a Low Fat Chocolate that Might Actually Taste Good

Clever boffins work on ways to make low fat chocolate taste less like Babybel rind


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lways looking for a way to cheat the frankly preposterous observation that doing more exercise and eating less food will lead to weight-loss, we offer you another chapter in the Snake Oil Testaments.

Low fat chocolate that is nice.

Although given that the research comes from the same country which invented the Hershey bar (normal fat chocolate that isn’t nice), we advise caution.

Chocolate is divinely delicious, mouthwateringly smooth and unfortunately full of fat. But reducing the fat content of the confection makes it harder and less likely to melt in your mouth. That’s why scientists are investigating additives that could reinstate chocolate’s delightful properties in these lower-fat treats. Now, researchers report in ACS’ Journal of Agricultural and Food Chemistry an analysis that sheds light on how adding limonene could improve lower-fat versions’ texture and ability to melt.

Flavor and sweetness make strong contributions to the pleasant experience of eating chocolate, but so do look and feel. Reducing the fat in chocolate, however, often ruins its texture and viscosity. Previous research has shown that adding limonene – a compound found in lemons and oranges – not low fat chocolateresults in a smoother, softer chocolate that melts more easily than typical reduced-fat chocolates. Annelien Rigolle and colleagues at KU Leuven in Belgium sought to investigate exactly how limonene impacts chocolate production. They focused on one part of this process: the crystallization of one of its main ingredients, cocoa butter, which undergoes several important transformations at different times and temperatures.

The researchers examined crystallization at 63 °F and 68 °F using differential scanning calorimetry and X-ray diffraction to examine cocoa butter profiles when limonene was added. Surprisingly, they found that adding the compound accelerated cocoa butter crystallization at 63 °F, but inhibited cocoa butter crystallization at 68 °F. Varied concentrations of limonene also affected the crystallization steps of the cocoa butter differently, so they could ultimately affect the texture of chocolate. The study suggests that carefully choosing the amount of limonene and the temperature at which chocolate is processed could lead to a smoother, more luxurious reduced-fat chocolate.

Source: Eurekalert/American Chemical Society


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