The efficiency of a commercial peracetic acid sanitizer on destruction of Staphylococcus aureus and Escherichia coli was evaluated using two distinct methods. The first method is the AOAC suspension test and the second is a method proposed by one of the authors in which the microbial cells are settled on a stainless steel surface and then treated with the sanitizer. The results showed that when in suspension S. aureus was more resistant to the sanitizer than E. coli. When S. aureus was settled on the stainless steel surface, the contact time between the sanitizer and the microorganisms to attain a 6.5 log reduction in the number of viable cells was three times greater than when the cells were in suspension.
RESUMOO processamento industrial da manga gera um grande volume de resíduos que não são reaproveitados mas descartados de forma inadequada. O objetivo deste trabalho foi extrair o amido da amêndoa da manga Tommy Atkins e utilizá-lo como espessante em bebida láctea. Para ser utilizado em bebida láctea em três concentrações (1,2; 0,6 e 0,3%) o amido foi caracterizado através de análises físico-químicas e microbiológicas e, por microscopia eletrônica de varredura, a morfologia dos grânulos, capacidade de gelificação (1,2; 0,6 e 0,3%) e só então submetido à análise sensorial. O amido apresentou rendimento de extração de 59,82% em peso de amêndoas com umidade de 10,14%, proteína de 2,33%, cinzas de 0,35% e lipídios de 4,67%, além da isenção de micro-organismos patogênicos. O formato do grânulo de amido foi irregular, entre esféricos a elipsoidais, com tamanhos diferenciados. A concentração mínima de gelificação foi observada em 6% de amido. A bebida láctea elaborada mostrou-se viável à comercialização por apresentar boas características sensoriais e físico-químicas utilizando-se 0,3% de amido como espessante. O amido apresentou características desejáveis podendo ser largamente utilizado. Palavras-chave: Mangifera indica L., aproveitamento de resíduos, produtos lácteosUse of starch of almond of Tommy Atkins mango as thickener for dairy beverages ABSTRACT The industrial processing of mango generates a large volume of waste, which is not reused or properly disposed. This study aimed to extract starch from almond of Tommy Atkins mango and use it as a thickener in dairy beverages. The starch was characterized by physicochemical and microbiological analysis, and the granule morphology and gelling ability were observed by scanning electron microscopy, and used in dairy beverages at three concentrations (1.2, 0.6 and 0.3%), being submitted to sensory analysis. The starch showed extraction yield of 59.82% by weight of almonds with 10.14% moisture, 2.33% protein, 0.35% ash, 4.67% fat, and absence of pathogenic microorganisms. The shape of starch granules was irregular between spherical to ellipsoidal with different sizes. The minimum gelling concentration was observed in 6% starch. The prepared dairy beverages showed viable commercialization by presenting good sensory and physico-chemical characteristics, using 0.3% starch as thickener. The starch showed desirable characteristics, which can be widely used.
Resumo: A utilização de sementes germinadas na elaboração de produtos alimentícios com boa qualidade nutricional é uma possibilidade e o sorgo pode se apresentar como alternativa ao consumo dos cereais convencionais. O objetivo deste estudo foi de observar as alterações nos parâmetros físico-químicos da semente de sorgo antes e após o processo de germinação, assim como avaliar as propriedades funcionais indicando suas possíveis utilizações como ingrediente alimentar. As sementes germinadas apresentaram um aumento no teor proteico, passando de 4,32 para 7,20%, além da diminuição no teor de amido e consequente aumento no teor de açúcares redutores. A partir das propriedades funcionais avaliadas, a semente de sorgo germinada apresentou uma boa capacidade de absorção de óleo, podendo ser utilizado como ingrediente para auxiliar na textura e suculência de produtos. A germinação garantiu boa capacidade de formação de espuma e sua estabilidade, podendo ser utilizado como ingrediente em produtos alimentícios de fermentação, como bolos e biscoitos, além de bom agente de formação de gel podendo ser útil em sistemas alimentícios como pudim e lanches, que requerem espessamento e gelificação. Palavras-chaves:Grão. Germinação. Atividade enzimática. Abstract:The use of germinated seeds in the preparation of food products with good nutritional quality is a possibility and sorghum can be presented as an alternative to the consumption of conventional cereals. The objective of this study was to observe the changes in physical and chemical parameters of sorghum seed before and after the germination process, and assess the functional properties indicating their possible use as a food ingredient. Germinated seeds showed an increase in protein content, from 4.32 to 7.20% in addition to the decrease in the starch content and the consequent increase in reducing sugars. From the functional properties evaluated, the germinated sorghum seeds showed a good ability to absorb oil and can be used as an ingredient to aid in texture and juiciness products. Germination ensured good foaming ability and stability, can be used as an ingredient in food products of fermentation, such as cakes and cookies, and good gelling agent may be useful in food systems such as pudding and snacks, which require thickening and gelation.
Prata variety banana starch is little known and has great economic potential due to its extensive cultivation in developing countries. This study characterizes this native starch and modifies by annealing at different temperatures (45, 50, and 55 °C). The native starch presents a high apparent amylose content (46.67%), besides it showing granules of several sizes and shapes containing rounded ends, which remain unchanged with the annealing. The weaker crystals are seen to be strengthened by the treatments at 50 and 55 °C, since the gelatinization onset and peak temperature increase. It also is possible to verify that the molecular order of the double amylopectin helices (ΔH) remains unaltered, but the uniformity of the molecular structure (Tc − To) increases. Regarding the pasting properties, annealing contributes to improving the paste's stability to heat and shear, but contributes to decreasing the stability of cooled starch paste. In addition, annealing increases the paste clarity and the least gelation concentration. Native starch stands out by its high resistant starch content (34.71%), which can be increased to 74.5% through annealing at 55 °C.
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