Robusta coffee is usually cheaper than arabica coffee. Mixtures of the two can be produced and labelled correctly for consumer taste. However, 100% arabica coffees may be mixed with robusta coffee to reduce costs. Brazilian researchers have developed primers which specifically amplify arabica coffee but not robusta in blends of roasted and ground coffee. The percentages of arabica coffee  in blends can be determined using real-time PCR.

  Read the abstract here

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