Resumo Vinagres gourmet são ingredientes culinários versáteis, que despertam o interesse dos consumidores não só pelo sabor peculiar, mas também pelos benefícios à saúde. Neste trabalho, inicialmente vinho de mirtilo e mel foi obtido em biorreator com altas concentrações de fenólicos (706,18 mg GAE/mL). Elevada capacidade de eliminação dos radicais livres DPPH (161,42 μmol de equivalente trolox/100 mL) e ABTS•+ (356,41 μmol de equivalente trolox/100 mL), bem como capacidade antioxidante redutora de íons férricos (1419,86 μmol FeSO4/100 mL) também foram verificadas. Vinagre foi obtido a partir do vinho, em sucessivos ciclos de acetificação em barril de madeira. A concentração média de ácido acético encontrada foi de 4,4 g/100 mL e a produção média e a produtividade foram, respectivamente, 52,69% e 0,38 g/L.h. Apreciáveis conteúdos de polifenóis (681,87 a 847,98 μg GAE/mL), antocianinas (12,8 a 15,39 mg/L) e alta atividade antioxidante foram verificadas no vinagre. Os vinagres demonstraram capacidade antimicrobiana contra Bacillus subtilis e Salmonella enterica Typhimurium.

Abstract Gourmet vinegars are versatile culinary ingredients that have aroused the interest of consumers not only for their unusual taste, but also for their health benefits. In this work, blueberry and honey wine was first obtained using a bench-scale bioreactor. This wine had high concentrations of phenolic compounds (706.18 mg GAE/mL) and appreciable free radical scavenging ability against DPPH (161.42 µmol trolox equivalent/100 mL) and ABTS•+ (356.41 µmol trolox equivalent/100 mL), as well as ferric-ion reducing antioxidant capacity (1419.86 µmol FeSO4/100 mL). In sequence, vinegar was produced from the wine in wooden barrels using successive acetification cycles. The average acetic acid concentration found in the vinegars was 4.4 g/100 mL, and the average acetic acid yield and volumetric productivity were 52.69% and 0.38 g/(L.h), respectively. Appreciable polyphenolic compounds (681.87 to 847.98 µg GAE/mL) and anthocyanin (12.8 to 15.39 mg/L) contents were found and high antioxidant activity. In addition, the vinegars demonstrated antimicrobial ability against Bacillus subtilis and Salmonella enterica Typhimurium.

Abstract Two experiments were carried out using loofa sponge and sugarcane bagasse as immobilization support. First a 2(5-2) design of experiments was realized with the following independent variables: sucrose concentration; pH; incubation time and agitation. Based on the best results observed in this experiment, the capacity for reuse of the supports in subsequent fermentations was evaluated for 12 recycle days. Loofa sponge support was the best immobilization support and in the 2(5-2) experiment, it showed 2.58 g.L-1 of immobilized cells and 19.13 g.L-1 of exopolysaccharide levan. Sugarcane bagasse showed the highest ethanol production (103.82 g.L-1). In the immobilization support recycling experiment, sugarcane bagasse was the most promising support since it showed cell viability up to the last fermentation cycle, confirmed by scanning electronic microscopy, also showing the largest values for immobilized biomass (3.23 g.L-1), levan (32.13 g.L-1), ethanol (148.18 g.L-1) and sucrose consumption (92.64%).

ABSTRACT: Blackberry vinegar was produced in successive acetification cycles and content of total phenolics, anthocyanins and antioxidant activity were evaluated along the production. Firstly, blackberry wine was obtained in bench-scale bioreactor, being verified 0.39 g/g ethanol yield, 1.78 g/L.h volumetric productivity and 76% efficiency. After, three successive acetification cycles were conducted efficiently in grapia barrel with average acetic acid production of 51.6 g/L, 72.2 % acetic acid yield and 0.4 g/L.h volumetric productivity. Appreciable contents of polyphenolic compounds, anthocyanins and high antioxidant activity were observed in the raw material, wine and vinegar obtained in each cycle of acetic acid transformation. Acetic acid transformation led the small reduction of antioxidant activity compared to alcoholic fermentation, but the antioxidant potential was maintained along the cycles. The content of total phenolics and anthocyanins also suffered a reduction in step of acetification.