Compostos bioativos e capacidade antioxidante em blends em pó de frutas e hortaliças obtidos por atomização.

Abstract

The juice powders of fruits and vegetables have high biological potential because they area natural food that meets the current trends, ease of use and mainly for theirs antioxidant effects. Therefore the aim of this research was to develop a powder of juices from fruits and blends of vegetables, obtained by spray drying, as well as evaluated in the prepared samples the presence of bioactive compounds and the antioxidant capacity during the storage time. The physico-chemical analyses were performed in two formulations of blends in natura (A and B): A blend (cabbage, broccoli, pineapple, mint green and acerola) and blend B (cabbage, green apple, lemon and ginger). The blend powder was obtained by drying the spray forming, the dryer operating conditions are: air temperature 80°C, 5mL.min-1 suspension flow rate and the concentration of maltodextrin 5%. In powder samples (AI and BI) were analyzed the parameters: physical, physico-chemical, bioactive compounds and antioxidant capacity (DPPH and ABTS). For comparison with the formulated powder samples in this study was purchased commercially from Great Meadow product labeled as powdered green juice, which was named sample C and were performed the same analysis. The formulated powders were analyzed in 30 days to 180 days of storage time, and in each samples were analyzed the water content, color, fixed mineral residue, pH, titratable acidity, soluble solids, total sugars, ascorbic acid, chlorophyll, carotenoids, flavonoids, anthocyanins, phenolic compounds and antioxidant capacity. Microbiological analyzes were performed for coliforms at 45°C, molds and yeasts, Salmonella and Staphylococcus counts were realized at baseline and end of storage time. The sensory analysis of the powders samples were performed using the sensory acceptance testing, consumer attitude and ordering preferably with one hundred of untrained panelists. According to the results of bioactive compounds in natural powder blend of Sample A was higher in all components, especially in ascorbic acid content for which the blend A was 360.00 mg.100g-1 and B 60 mg.100g-1, and phenolic compounds being 184.,52 mg GAE.100g-1 97.91 mg GAE.100g-1 and for blends A and B respectively. The antioxidant capacity was also higher for the blend A of 192.73 g polpa.DPPH-1. The powder samples had the same behavior, higher contents of ascorbic acid and phenolic compounds for the sample AI, and respectively 2670.00 mg.100g -1 and 2063.94 mg GAE.100g-1, while the sample BI obtained for the mentioned parameters respectively 570.00 mg.100g-1 and 1082.00 mg GAE.100g-1. When compared to the commercial sample C as the bioactive compounds formulated blends were sharply higher, with the ascorbic acid content of the Sample AI nineteen times higher and the phenolics about ten times higher than those obtained for sample C. The antioxidant potential of samples AI and BI were significantly higher than sample C, which is sixty five times lower than the sample A. The majority of the analyzed constituent underwent variation during the 180 days of storage time, but the samples still exhibit good results and good bioactive compounds of antioxidant potential at the end of storage time. The sensory analysis of blends formulated powder and in the commercial sample C resulted in a greater acceptance by the judges for the sample C, probably due adding of sucralose, flavoring and essences. Therefore, the results of analysis indicated that the best sample source of bioactive antioxidants was the Sample AI.