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Finally, a way to authenticate premium chocolate

Date:
January 15, 2014
Source:
American Chemical Society
Summary:
For some people, nothing can top a morsel of luxuriously rich, premium chocolate. But until now, other than depending on their taste buds, chocolate connoisseurs had no way of knowing whether they were getting what they paid for. Scientists are reporting, for the first time, a method to authenticate the varietal purity and origin of cacao beans, the source of chocolate's main ingredient, cocoa.

For some people, nothing can top a morsel of luxuriously rich, premium chocolate. But until now, other than depending on their taste buds, chocolate connoisseurs had no way of knowing whether they were getting what they paid for. In ACS' Journal of Agricultural and Food Chemistry, scientists are reporting, for the first time, a method to authenticate the varietal purity and origin of cacao beans, the source of chocolate's main ingredient, cocoa.

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Dapeng Zhang and colleagues note that lower-quality cacao beans often get mixed in with premium varieties on their way to becoming chocolate bars, truffles, sauces and liqueurs. But the stakes for policing the chocolate industry are high. It's a multi-billion dollar global enterprise, and in some places, it's as much art as business. There's also a conservation angle to knowing whether products are truly what confectioners claim them to be. The ability to authenticate premium and rare varieties would encourage growers to maintain cacao biodiversity rather than depend on the most abundant and easiest to grow trees. Researchers have found ways to verify through genetic testing the authenticity of many other crops, including cereals, fruits, olives, tea and coffee, but those methods aren't suitable for cacao beans. Zhang's team wanted to address this challenge.

Applying the most recent developments in cacao genomics, they were able to identify a small set of DNA markers called SNPs (pronounced "snips") that make up unique fingerprints of different cacao species. The technique works on single cacao beans and can be scaled up to handle large samples quickly. "To our knowledge, this is the first authentication study in cacao using molecular markers," the researchers state.


Story Source:

The above story is based on materials provided by American Chemical Society. Note: Materials may be edited for content and length.


Journal Reference:

  1. Wanping Fang, Lyndel W. Meinhardt, Sue Mischke, Cláudia M. Bellato, Lambert Motilal, Dapeng Zhang. Accurate determination of genetic identity for a single cacao bean, using molecular markers with a nanofluidic system, ensures cocoa authentication. Journal of Agricultural and Food Chemistry, 2013; 131219171730006 DOI: 10.1021/jf404402v

Cite This Page:

American Chemical Society. "Finally, a way to authenticate premium chocolate." ScienceDaily. ScienceDaily, 15 January 2014. <www.sciencedaily.com/releases/2014/01/140115113523.htm>.
American Chemical Society. (2014, January 15). Finally, a way to authenticate premium chocolate. ScienceDaily. Retrieved March 30, 2015 from www.sciencedaily.com/releases/2014/01/140115113523.htm
American Chemical Society. "Finally, a way to authenticate premium chocolate." ScienceDaily. www.sciencedaily.com/releases/2014/01/140115113523.htm (accessed March 30, 2015).

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