RESUMO:A amoreira-preta é uma espécie arbustiva de porte ereto ou rasteiro, cujos frutos são agregados em forma de drupas de coloração negra e sabor ácido a doce-ácido. A fruta in natura é altamente nutritiva, possuindo 85% de água, além de proteínas, fibras, carboidratos, cálcio, fósforo, potássio, magnésio, ferro e várias outras vitaminas. Por possuir grande quantidade de água, as perdas durante o processo de armazenamento e de comercialização são significativas. Visando diminuir essas perdas, o uso de técnicas como o resfriamento e o uso de embalagens tornaram-se uma alternativa viável. Deste modo, o presente trabalho teve por objetivo avaliar a qualidade pós-colheita das amoras armazenadas a 0oC, utilizando embalagem plástica e biofilme de fécula de mandioca na concentração de 5%. Como parâmetros de qualidade foram quantificados a perda de massa, pH, acidez titulável, sólidos solúveis totais e cor. As amoras foram selecionadas e armazenadas por 4 dias, durante os quais as mesmas foram analisadas. O uso da embalagem associada com a fécula de mandioca foi eficiente para reduzir a perda de massa ao final de 4 dias de armazenamento e aumentar os teores médios de sólidos solúveis totais, já os teores médios de acidez titulável e pH se conservaram. O croma foi maior com o uso de embalagens, as quais se mostraram eficientes para manter a qualidade dos frutos armazenados, a aparência do produto e as suas propriedades nutricionais antioxidantes. Conforme o tempo passou, a tonalidade das amoras-pretas diminuiu, indicando uma redução no teor de água nos frutos. PALAVRAS-CHAVE: refrigeração, armazenamento, Rubus sp. CONSERVATION POST-HARVEST OF BLACKBERRY CHILLED USING BIOFILM AND PLASTIC PACKAGING ABSTRACT:The blackberry is a shrubby species of erect or creeping, whose fruits are aggregates shaped drupe black coloring and the sweet-sour taste acid. The fresh fruit is highly nutritious, having 85% water, besides proteins, fibers, carbohydrates, calcium, phosphorus, potassium, magnesium, iron and several vitamins. By having lots of water losses during storage and marketing are significant. To decrease these losses, the use of such cooling techniques and the of packaging have become a viable alternative. Thus, the present study aimed to evaluate the postharvest quality of blackberries stored at 0°C using plastic bag and biofilm cassava starch at a concentration of 5%. As quality parameters were measured mass loss, pH, titratable acidity, soluble solids and color. The berries were selected and stored for 4 days, during which they were analyzed. The use of the packaging associated with cassava starch was effective in reducing the weight loss occurred after 4 days of storage and increase the average levels of soluble solids, since the average levels of acidity and pH were maintained. The chroma was greater with the use of packaging, which proved effective in maintaining the quality of stored fruits, the appearance of the product and its nutritional antioxidants. As time passed, the hue of blackberries decreased, indicating a...
The contamination of aquatic environments with chemical trace elements can be evaluated by their accumulation in sediments of the water body. Studies on mercury require the use of exclusive extraction techniques that have relatively high costs when compared to the analysis of other trace elements. This study was conducted aiming at determining the mercury concentration in sediments of the Upper Parnaíba River basin, located in a region of agricultural expansion between the states of Piauí and Maranhão. The sediment was collected at 12 sites in the basin. After drying, the quantification of total mercury was performed by the Zeeman atomic absorption spectrometry coupled to a pyrolysis reactor. Mercury concentrations in sediments of the Parnaíba River ranged from 4.2 to 58.5 ng g −1 and presented a low probability of adverse effects on biota. Mercury had no correlation with the variables clay, silt, sand, total organic carbon, iron, and aluminum, demonstrating its possible anthropogenic origin. Although mercury concentrations have a low probability to disturb the balance of the local ecosystem, there is a need for monitoring the region in order to quantify the risks to biota and human health.
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