Browsing by Author "Vieira, Mariele Antunes"

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    Efeito do tempo e da temperatura nas características físicas de doces mistos dietéticos e funcionais de frutas do cerrado.
    (2020) Brandão, Telma Melo; Vieira, Mariele Antunes; Elias, Heloisa Helena de Siqueira; Schiassi, Maria Cecília Evangelista Vasconcelos; Santos, Hellen Vidal; Pereira, Patrícia Aparecida Pimenta; Carvalho, Elisângela Elena Nunes; Queiroz, Fabiana; Borges, Soraia Vilela
    Existem inúmeros frutos do cerrado com potencial econômico para elaboração de produtos que atendam a demanda do consumidor, como doces dietéticos e funcionais. entretanto, são escassos estudos a respeito das características destes produtos e estabilidade durante armazenamento. dessa forma, o objetivo deste estudo foi avaliar o efeito do tempo e da temperatura nas características físicas de doces mistos dietéticos e funcionais utilizando frutos do cerrado. para isso, foram elaborados doces mistos utilizando marolo, maracujá-doce e graviola e frutooligossacarídeo sem adição de açúcar. os doces foram armazenados em 2 temperaturas (25 °c e 35 °c) durante 180 dias. foram realizadas análises de atividade de água, cor e perfil de textura e os resultados obtidos foram avaliados por meio de análise de regressão. os doces mistos dietéticos e funcionais de frutas do cerrado sofreram influência tanto do tempo como da temperatura de armazenamento, sendo que a temperatura de 35 °c foi a variável que mais afetou as características físicas. diante disso, no armazenamento a temperatura de 25 °c, as propriedades físicas dos doces mistos dietéticos e funcionais de frutas do cerrado foram mais estáveis.
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    Optimization of texture profile analysis parameters for commercial guava preserve.
    (2021) Vieira, Mariele Antunes; Schiassi, Maria Cecília Evangelista Vasconcelos; Dias, Ana Clara Costa; Curi, Paula Nogueira; Pereira, Patrícia Aparecida Pimenta; Carneiro, João de Deus Souza; Borges, Soraia Vilela; Queiroz, Fabiana
    Motivated by the lack of studies that standardize and optimize the parameters of texture tests, this study aimed to determine the operating conditions for TPA to maximize the discrimination among samples of fruit preserves. The texture of the commercial guava preserves was evaluated using a texturometer. The Design Central Composite Rotational (DCCR) method was applied with four independent variables: speed test, sample volume, time between compression cycles and compression percentage. Only the compression percentage and test speed were significantly influenced by the texture parameters evaluated. The optimum operating region of TPA to better discriminate differences in texture parameters depended on the variable to be optimized, and for adhesiveness a compression of 75% and a compression speed of 0.23 mm·s are recommended. To detect differences among the samples for the parameters of cohesiveness, gumminess and resilience, the use of 15% compression and 2.59 mm·s speed is suggested. In both cases, one must employ the shortest time between two cycles and use a smaller sample size to save both the time of analysis and of the sample, respectively. For the parameters of hardness, elasticity and chewiness, optimal regions were not identified.
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    Sugar-free guava preserve : influence of additives on textural properties.
    (2017) Pereira, Patrícia Aparecida Pimenta; Souza, Vanessa Rios de; Vieira, Mariele Antunes; Queiroz, Fabiana; Borges, Soraia Vilela; Carneiro, João de Deus Souza
    The development of sugar-free products requires the inclusion of many additives to provide all of the characteristics of sugar products. Thus, the present study aimed to evaluate the effect of different additives (fructooligosaccharide, thaumatin, sucralose, stevioside, maltitol, xanthan gum, locust bean gum, carrageenan, low methoxyl pectin and polydextrose) on the textural properties of functional sugar-free guava preserves. The Plackett and Burman design with 19 tests was used. Texture profile analysis and stress relaxation test were performed. The results were analyzed by analysis of the effects and principal component analysis. The low methoxyl pectin positively affected some parameters of the texture profile (hardness and gumminess) and relaxation test properties (η2 and k1). The other ingredients (except maltitol, which did not affect any textural parameters) affected only the texture profile parameters. The results also indicated that higher concentrations of gelling agents in the product resulted in greater influences on the textural properties.