Abstract In this study, the stability of the bioactive compounds from camu-camu and jambolan mixture was evaluated, and a juice blend formulation based on its sensorial properties was established. The stability of three juice formulations with camu-camu/jambolan/water (w:w:w), 37.5:12.5:50 (JB); 37.5:0:62.5 (CJ) and 0:12.5:87.5 (JJ) was evaluated. Additionally, the bioactive compounds and sensory acceptance were performed in six juice formulations with camu-camu/jambolan: 12.5:37.5 (F1); 17.5:32.5 (F2); 22.5:27.5 (F3); 27.5:22.5 (F4); 32.5:17.5 (F5) and 37.5:12.5 (F6). The stability of the anthocyanins in the JB formulation was ensured for 5 days of storage at 25 °C. First-order reaction kinetics described the degradation of anthocyanins during 10 days of storage. The internal preference map analysis evidenced two groups: one formed by the formulations F1 and F2 and the other by F3, F4, F5 and F6. Sensory analysis showed that the formulation with the lowest concentration of camu-camu (F1) presented the highest sensory acceptance rate (80.4%), high bioactive compounds contents: 23.04 mg anthocyanins.100 mL-1, 353.32 mg ascorbic acid.100 mL-1, 892.06 mg phenolic compounds.100 mL-1, and high antioxidant capacity (3667.78 mM ET.100 mL-1). The results shows that juice blend with camu-camu/jambolan 12.5:37.5 (F1) have a good acceptance and high bioactive compounds content.

Abstract Tucupi is a product obtained from the fermentation and cooking of cassava root wastewater which is widely used in the popular cuisine of the North region of Brazil. This study employed an experimental design to select tucupi processing (fermentation and cooking times) as a function of residual cyanidric acid content and assess the stability of the product obtained. Although the design did not generate a predictive mathematical model, the trend plots and physicochemical and sensory tests indicated 24 h of fermentation and 40 min of cooking as process parameters. The tucupi prepared had pH 3.71, titratable acidity of 0.7 g lactic acid/100 mL, 93.91% moisture, 0.5% ashes, 0.52% proteins, 0.24% lipids, 4.83% carbohydrates, total and free cyanide of 6.97 and 1.31 mg HCN/L, respectively. No Salmonella spp., coagulase-positive Staphylococcus, Bacillus cereus , or thermotolerant coliforms were observed, whereas counts of mesophilic aerobic bacteria (1.3x102 CFU/g) and molds and yeasts (1.3x102 CFU/g) were low. Over 50 days of follow-up (stored at 10°C), the microbial load remained stable and no significant difference was found in physicochemical characteristics, however, the sensory analysis indicated a decrease in quality at 49 days of storage.

RESUMO Como uma alternativa para as pessoas que procuram opções para uma alimentação saudável, as barras de cereais foram lançadas no mercado. Elas são populares como alimentos portáteis e podem ser consumidas entre as refeições. Este trabalho teve como objetivo desenvolver e determinar as variáveis físicas, físico-químicas, microbiológicas e sensoriais de barras de cereais à base de farinha de tapioca, castanha-do-brasil e polpas de frutas regionais (açaí, cupuaçu, muruci e taperebá). A concentração preferida de polpa na barra sabor açaí foi de 10% e nas barras sabor cupuaçu, muruci e taperebá de 15%. O índice de aceitação da barra sabor açaí foi superior a 70% nos atributos aparência, cor, textura e impressão global e inferior no sabor. Este comportamento pode estar relacionado à cultura de alguns provadores, os quais têm o hábito de consumir a polpa de açaí sem adição de qualquer outro ingrediente que possa mascarar o sabor intrínseco e peculiar do fruto. As barras sabor cupuaçu e muruci, por apresentarem maior aceitação sensorial, quando comparadas às barras sabor açaí e taperebá, têm melhores perspectivas de mercado caso sejam comercializadas.

ABSTRACT Snack bars were launched on the market as an alternative for people seeking healthier food options. They are popular portable snacks commonly eaten between meals. This study aimed to develop snack bars made with tapioca flour, Brazil nut and native fruit pulps (açaí, cupuaçu, muruci and taperebá) as well as to assess their physical, physicochemical, microbiological and sensory attributes. The preferred concentration of fruit pulp was 10% in the açaí bar, and 15% in the cupuaçu, muruci and taperebá bars. The acceptance rate of the açaí bars was greater than 70% for the attributes appearance, color, texture, and overall impression, but was lower for flavour. This result may be related to the eating habits of some panelists, who eat açaí pulp without adding any other ingredients that can impart the unique flavour of the fruit. The cupuaçu and muruci snack bars had higher sensory acceptance than the açaí and taperebá bars; therefore, they are more likely to have better market prospects.