Abstract-Pereskia aculeataMiller is a native cactaceae found from the Northeast to the South of Brazil. This plant is recognized by the high nutritional value of their leaves, which are the most used in cooking and folk medicine. However, studies on the chemical characteristics and antioxidant capacity of the ora-pro-nobis fruits are scarce. Therefore, the aim of this study was to determine the best harvest point of the ora-pro-nobis fruits to optimize the content of bioactive compounds and their antioxidant capacity. The fruits were manually harvested, defined by their peel colors in three maturity stages: unripe (green), intermediate (yellowish green), and ripe (yellow) stages. The following attributes were evaluated: soluble solids (SS), titratable acidity (TA), SS/TA ratio, pH, and content of bioactive compounds, such as total chlorophylls, carotenoids, yellow flavonoids, total phenolic compounds, and antioxidant capacity. There was a decrease in the content of chlorophyll followed by an increase in the of total carotenoids and yellow flavonoids, due to the maturity stage. For the total phenolic compounds, it was not observed significant difference between the stages. The antioxidant capacity was quantified by the ORAC method in lyophilized pulp in the unripe (1.95 mmol 100 g -1 trolox) and ripe (3.85 mmol 100 g -1 trolox) stages. The lowest contents were observed in the intermediate (0.80 mmol 100 g -1 trolox in lyophilized pulp) stage. The maturity stage significantly influenced the bioactive compounds of ora-pro-nobis, which presented higher values of total carotenoids, yellow flavonoids, and antioxidant capacity in ripe fruits. Index terms: Pereskia aculeata Miller; Maturity index; Harvest point; Postharvest; Brazilian native fruits.
Frutos de ora-pro-nóbis (Pereskia aculeata miller) maduros expressam maiores conteúdos de compostos bioativos e capacidade antioxidanteResumo -Pereskia aculeata Miller é uma cactaceae nativa encontrada do Nordeste ao Sul Brasileiro. A planta é reconhecida pelo alto valor nutritivo das folhas, parte mais utilizada na culinária e na medicina popular. Entretanto, trabalhos sobre as características químicas e a capacidade antioxidante dos frutos de ora-pro-nóbis são escassos. Diante disso, o objetivo deste estudo foi determinar o melhor ponto de colheita em frutos de ora-pro-nóbis, visando a otimizar a presença de compostos bioativos e a capacidade antioxidante. Os frutos foram colhidos manualmente, e os três estádios de maturação foram definidos pela coloração da casca, sendo: estádio verde (coloração verde), intermediário (coloração verde -amarelada) e maduro (coloração amarela). Os atributos avaliados foram os sólidos solúveis (SS), acidez titulável (AT), relação SS/AT, pH, e os compostos bioativos, como as clorofilas totais,carotenoides totais, flavonoides amarelos, compostos fenólicos totais e capacidade antioxidante. Houve diminuição da clorofila e aumento no teor de carotenoides totais e flavonoides amarelos, em função do avanço no estádio de maturação. Para os compostos ...