Droplet digital polymerase chain reation (ddPCR) technology is a PCR method utilising a water-oil emulsion droplet system, where each nanoliter-sized droplet in the emulsion contains the template DNA molecules, essentially serving the same function as individual test tubes or wells in a plate in which the PCR reaction takes place. In this study, ddPCR was used to detect adulteration of acacia honey with canola (rapeseed) honey. DNA extraction from pollen in acacia honey and canola honey was performed using four different pollen treatment methods. A duplex ddPCR method was developed based on the specific target gene in acacia and canola, which permitted detecting up to 1% adulteration of canola in acacia. This method is more rapid and accurate than the accepted microscopy examination of honey pollen, but does not address exogenous sugar adulteration of honey.
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