## 3 Results and Discussion
### Carbohydrate Profile: Mono-, Di- and Oligosaccharides  
Total carbohydrates were investigated and classified and quantified as mono-, di- and oligosaccharidesacharides as shown in Table 1. Among monosaccharides, glucose was the main simple sugar found in all fractions, and the PU fraction presented the highest value at 1687.87 \(\pm\) 13.50 mg\(\cdot\)100 g\({}^{-1}\) (\(p\) < 0.05). The SE fraction showed the highest fructose content (801.67 \(\pm\) 4.04 mg\(\cdot\)100 g\({}^{-1}\)), about 1.8, 1.5, 2.0 times greater than that of the WS, PU and PE fractions, respectively. The values of glucose and fructose were lower than those found in buriti (_Mauritia flexuosa_) (13,240 mg\(\cdot\)100 g\({}^{-1}\) for glucose and 2770 mg\(\cdot\)100 g\({}^{-1}\) for fructose) but higher than those found in acqi (_Enterpe oleraceae_) (250 mg\(\cdot\)100 g\({}^{-1}\) for glucose and 90 mg\(\cdot\)100 g\({}^{-1}\) for fructose) [4]. Regarding the disaccharides, sucrose was found only in the seed (3038.37 \(\pm\) 28.76 mg\(\cdot\)100 g\({}^{-1}\)). The sucrose concentration found in this study was higher than that found in the uvaia seed (1352 \(\pm\) 0.10 mg\(\cdot\)100 g\({}^{-1}\)) [37]. The maltose was found in all fractions and ranged from 466.80 \(\pm\) 21.52 mg\(\cdot\)100 g\({}^{-1}\) in the PU to 523.32 \(\pm\) 23.87 mg\(\cdot\)100 g\({}^{-1}\) in the SE; therefore, there was no statistical difference among the fractions (\(p\) > 0.05). The maltose content of the WS, PU, PE and SE fractions was higher than that of the edible fractions and seeds of uvaia (_Eugenia pyriformis_) and araca-boi (_Eugenia stipitata_) [27; 37]. The buritirana has a high concentration of maltose, which represents about 50% of the maltose content in adulterated apple juices [38]. Maltose is a very important fermentable sugar, with potential to stabilize an emulsion in cooling and freezing processes, and when hydrolyzed it turns into glucose, which is widely used to reduce sweetness and increase the brightness of base products of fruits, such as jellies, among others [39; 40].  
Malto-oligosaccharides were not found in any of the fractions evaluated. Fructooligosaccharides were found in the seed, generally GF2 and GF3, and was approximately 16.7 and 2.0 times higher than in the WS fraction, respectively; GF2 and GF3 concentrations in WS and SE fractions were 157.91 \(\pm\) 10.21 mg\(\cdot\)g\({}^{-1}\) and 2646.49 \(\pm\) 137.65 mg\(\cdot\)g\({}^{-1}\), respectively (Table 2). This is the first study that includes an analysis of the carbohydrate profile of the buritirana fruit. Other studies on native fruits from different regions of Brazil have shown the presence of the following compounds: GF2 (63.80 mg\(\cdot\)100 g\({}^{-1}\)) and GF3 (374.91 mg\(\cdot\)100 g\({}^{-1}\)) in the jua-acu pulp (_Solanum oocarpum_ Sendtn.); GF2 (26.81 mg\(\cdot\)100 g\({}^{-1}\)) and GF3 (66.69 mg\(\cdot\)100 g\({}^{-1}\)) in the fruta-do-lobo pulp (_Solanum lycocarpum_ St. Hill) [33]; GF2 (27 \(\pm\) 0.03 mg\(\cdot\)100 g\({}^{-1}\)) in the edible fraction of _Eugenia stipitata_ [27]; and GF2(21 \(\pm\) 0.04 mg\(\cdot\)100 g\({}^{-1}\)) in the uvaia seed (_Eugenia pyriformis_) [37]. Among the reported fruits, the jua-acu pulp showed the highest levels of GF2 and GF3. However, in comparison to the jua-acu seed, the value of GF2 (2646.49 mg\(\cdot\)100 g\({}^{-1}\)) of the buritiraana seed was 41.5 times higher, and the value of GF3 was only 1.8 times lower. Oligosaccharides are specific groups of carbohydrates that have prebiotic activity and are applied as food ingredients, additives for cosmetics, pharmaceutical products and preservatives for fruits and vegetables. They are associated with several functional properties, such as improvement of intestinal function, mineral absorption, regulation of lipid and glycemic metabolism and reduction in the risk of developing colon cancer [27; 41]. This reinforces the importance of investigating these compounds and shows that buritiraana has great potential for the production of food products with functional attributes.