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Kwao Khruea, the tuberous roots of Pueraria candollei Graham ex Benth. (White Kwao Khruea), Butea superba Roxb. (Red Kwao Khruea), and Mucuna macrocarpa Wall. (Black Kwao Khruea), are used as rejuvenating herbs in traditional medicine in many tropical countries. Although Kwao Khruea has attracted strong interest because of its rejuvenation properties, each species is used for specific purposes and effects. P. candollei shows estrogenic effects in females. In contrast, B. superba and M. macrocarpa show androgenic effects in males. The potential misidentification of dried tuberous roots of various Kwao Khruea species might cause problems in the drug market, especially when they are reduced into powders. A cycleave PCR, which is based on the sequence of chloroplast matK gene, was developed to differentiate P. candollei, B. superba, and M. macrocarpa. The results showed that cycleave PCR is able to identify specific Kwao Khruea species. A multiplex cycleave PCR was optimized for the simultaneous detection of two different DNA targets in a DNA admixture. The specificity of this technique was confirmed by its ability to distinguish M. macrocarpa from five related Mucuna species. Cycleave PCR can be a specific, sensitive, and rapid method for the identification of medicinal plants and crude plant samples.

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The Use of Cycleave PCR for the Differentiation of the Rejuvenating Herb Species Pueraria candollei (White Kwao Khruea), Butea superba (Red Kwao Khruea), and Mucuna macrocarpa (Black Kwao Khruea), and the Simultaneous Detection of Multiple DNA Targets in a DNA Admixture