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No abstract

Resumo O jamelão é uma fruta encontrada nas regiões Norte, Sudeste e Nordeste do Brasil. O extrato dos frutos apresenta atividade antioxidante, devido à presença de compostos bioativos, como carotenoides e compostos fenólicos. Este estudo objetivou elaborar filmes comestíveis, compostos por amido de mandioca como matriz principal, com a adição de extrato de jamelão. A polpa de jamelão foi concentrada em roto-evaporador para a obtenção do extrato aquoso. Os ensaios para a elaboração dos filmes foram realizados segundo um delineamento composto central 22 com três repetições no ponto central, para avaliar o efeito das concentrações de glicerol (7,95% a 22,05%) e de extrato de jamelão (15,9 a 44,1%) sobre as propriedades mecânicas do filme (força na perfuração e deformação na ruptura) e sobre o teor de compostos fenólicos. As maiores concentrações do plastificante glicerol e do extrato de jamelão influenciaram positivamente nas propriedades mecânicas do filme, provocando diminuição da força na perfuração de 3,61 N para 2,55 N e aumento da deformação na ruptura de 1,44% para 76,33%. Os efeitos lineares e quadráticos das concentrações de glicerol e de extrato de jamelão e suas interações foram significativas sobre as respostas: força na perfuração e deformação na ruptura, no nível de 95% de confiança. A concentração de extrato de jamelão teve efeito significativo sobre o teor de compostos fenólicos, com coeficiente de determinação R2=0,9782. A interação entre glicerol e extrato de jamelão auxilia na obtenção de filmes de amido de mandioca com boas propriedades mecânicas e bioativas.

Among many species of passion fruit, the bush passion fruit (Passiflora cincinnata Mast.) is a wild, edible fruit, of exotic flavor and has good acceptability for consumption. This study aimed to determine the physico-chemical characteristics of the bush passion fruit pulp, and to produce and characterize physico-chemically the ale beer made with bush passion fruit as a malt adjunct, using different percentages (10, 29, 39 and 49%) of this adjunct and temperatures (15 and 22°C) to evaluate its fermentative potential for production of beer and to verify the influence of the soluble solids content and the specific gravity decrease during the fermentation. The results indicated that the bush passion fruit is suitable to carry out the fermentative process and the bench test media containing 29% of malt adjunct obtained best results in fermentation at both 15 and 22°C, with alcohol yields of 7.61 and 8.29%(v/v), respectively.

Research background. Due to the lack of nitrogen in honey, the fermentation may be limited or delayed, in addition to stimulating the production of unpleasant sensory compounds, such as sulfur derivatives. The use of natural supplements has been investigated as low-cost alternatives for mainly correcting the nutritional deficiency of nitrogen in honey must in mead production. Experimental approach. Initially, the physicochemical characterization of the extracts was carried out. The fermentative performance of three yeasts [Saccharomyces bayanus Premier Blanc (SbPB), Saccharomyces cerevisiae Montrachet (ScM) and Saccharomyces cerevisiae Safbrew T-58 (ScST58)] in honey musts supplemented with rice bran (RBE) and soybean meal (SME) extracts was evaluated. The trials were compared with the fermentations of musts with commercial supplement (CS) and the control trials. Fermentations were carried out in Erlenmeyer flasks containing honey must supplemented with RBE, SME and CS (30 g/L), inoculated with 106 cells/mL and incubated at 30 °C for 264 h. Results and conclusions. There was significant difference in the evaluated properties of the extracts, with the exception of reducing sugars. The fermentations with SME reached the highest cell concentrations, as well as the largest sugar consumption of glucose and fructose and ethanol. The glycerol concentrations slightly increased when SME and CS were used. The largest concentrations of succinic and acetic acids were registered in the control trials produced by SbPB, ScM and ScST58. There was no production of formic and lactic acids. Results showed that the extracts can be used as low-cost alternatives for correcting the nutritional deficiency of nitrogen in honey must since they presented results similar to the synthetic supplement. Novelty and scientific contribution. The use of low-cost, unconventional supplements such as those used in this work, in addition to reducing the cost of the process by reducing fermentation time by providing nutrients needed to improve yeast metabolism, prevents the formation of compounds undesirable in the beverage due to prolonged fermentation time. It also makes it possible to add value to industrial by-products. Unconventional supplements have still been little tested in mead production.