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Biplot graph (scores and loading plots) obtained from Principal Component Analysis for ketones from volatile compounds in red-white pitaya. k1: 1-hydroxy- 2-Propanone,k2: 1-(2-furanyl)- Ethanone, k3: 2,3-Butanedione, k4: 2-Propanone, k5: 5-hexyldihydro- 2(3H)-Furanone, k6: diphenyl- Methanone, k7: <delta->Dodecalactone; R.Spme: Red Spme; B.Spme: Blue Spme.
