The species Hylocereus costaricensis, Hylocereus undatus and Selenicereus megalanthus are the main pitaya species produced and marketed in Brazil. The cultivation this fruit has increased in recent years due to its attractive appearance and sweet taste, and may be consumed fresh and processed for beverage and desserts. However, there are few studies on the biochemical traits and antioxidant capacity of the pulp of these species, which can to contribute to pitaya breeding programs for fresh consumption and processing industrial. The sugars and organic acids were extracted, subsequently, separated and quantified in a chromatographic system. Quantitation of total phenolic content and antioxidant capacity was performed by spectrophotometric analysis using Folin-Ciocalteu reagent and the DPPH radical scavenging, respectively. The data were submitted to ANOVA and Tukey test. H. undatus presented 9.83% of total sugars, distributed as 4.75% of glucose and 5.08% of fructose. Total sugar concentration for S. megalanthus was 5.93%,...

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