Sweet potato flour contains low-glycemic complex carbohydrates and, when it is ingested, prevents insulin spikes and prolongs the feeling of satiety. The aim of this study was to elaborate and to verify the acceptability of the shake with the total or partial substitution of maltodextrin for sweet potato flour. To elaborate the shake beverage, we used a 2 2 factorial design, with three central points, thus generating seven formulations. For the taste, color, texture, appearance, acceptance and attitude of purchase properties, sensory tests were conducted using a nine-point hedonic scale and panelists (n = 50). The highest acceptability formulations, formulations 3 (10% sweet potato flour; 25% maltodextrin) and 7 (0% sweet potato flour; 25% maltodextrin), were submitted to pH, moisture, ash, protein, lipid, crude fiber and total carbohydrate analyses. The statistical difference between the formulations from the T test (p < 0.05) was verified for the moisture, ash and lipid parameters. Formulation 3 presented higher values of moisture (93.26 ± 0.57) and lipids (1.91 ± 0.01), and formulation 7 had higher values of ash (0.39 ± 0.01). The results of the sensorial and physicochemical analyses of the shake indicate that sweet potato flour shows potential for the elaboration of this drink.

Bioethanol is a renewable fuel as an alternative source of energy of worldwide importance.The present study aimed to evaluate alcohol production from sweet potato, under varying reaction conditions for fermentation and hydrolysis. A genotype was selected to obtain dried flour and processed by acid hydrolysis and enzymatic hydrolysis with α-amilase and amiloglucosidase. The experiment was carried out in a completely randomized block design Research, Society and Development, v. 9, n. 2, e168922201, 2020 (CC BY 4.0) | ISSN 2525-3409 | DOI: http://dx.doi.org/10.33448/rsd-v9i2.2201 2 with three central point replicates combined with response surface methodology. The variables were pH, temperature and fermentation time. The alcohol content was determined by distillation with subsequent spectrophotometric analysis. Raw materials were characterized according to moisture, reducing sugars and starch, and 4.13%, 4.04% and 71.80% were obtained, respectively. Acid hydrolysis showed higher alcohol percentages of distilled samples. The highest values for acid hydrolysis and enzymatic hydrolysis in fermentations were 26.42% and 25.04%, respectively, carried out at pH 5.0 and 36°C for 5 days. The fermentation time was the most important variable, with higher and significant values for both types of hydrolysis. Acid hydrolysis presented higher potential for alcoholic production than enzymatic hydrolysis in sweet potato fermentation. ResumoO bioetanol é um combustível renovável como fonte alternativa de energia de importância mundial. O presente estudo teve como objetivo avaliar a produção de álcool a partir de batatadoce, sob diferentes condições de reação para fermentação e hidrólise. Um genótipo foi selecionado para obtenção de farinha seca e processado por hidrólise ácida e hidrólise enzimática com α-amilase e amiloglucosidase. O experimento foi realizado em delineamento de blocos completamente casualizados com três repetições de pontos centrais, combinadas com a metodologia da superfície de resposta. As variáveis foram pH, temperatura e tempo de fermentação. O teor de álcool foi determinado por destilação com subsequente análise espectrofotométrica. As matérias-primas foram caracterizadas quanto à umidade, açúcares redutores e amido, obtendo-se 4,13%, 4,04% e 71,80%, respectivamente. A hidrólise ácida mostrou maiores porcentagens de álcool nas amostras destiladas. Os maiores valores de hidrólise ácida e hidrólise enzimática nas fermentações foram 26,42% e 25,04%, respectivamente, realizados a pH 5,0 e 36 ° C por 5 dias. O tempo de fermentação foi a variável mais importante, com valores mais altos e significativos para os dois tipos de hidrólise. A hidrólise ácida apresentou maior potencial de produção alcoólica do que a hidrólise enzimática na fermentação da batata-doce.Palavras-chave: Ipomoea batatas L.; Saccharomyces cerevisiae; Hidrólise; Bioetanol. ResumenEl bioetanol es un combustible como fuente alternativa de energía de importancia mundial. El presente estudio tuvo como objetivo evaluar la producción de alcohol a parti...