01. Universidade Federal Rural de Pernambuco - UFRPE (Sede)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/1
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Resultados da Pesquisa
Item Desenvolvimento de metodologia analítica sustentável para quantificação do corante artificial vermelho allura AC em balas alimentícias(2024-03-04) Coutinho, Maria Eduarda Bezerra; Santos, Jandyson Machado; Gomes, Bruna Ramos de Souza; http://lattes.cnpq.br/4086942894025609; http://lattes.cnpq.br/4137257750865101; http://lattes.cnpq.br/0500898038657595In Brazil, it is estimated that around 8% of children under 3 years of age have food allergies, caused by the inflammatory response after eating certain foods, especially sweets. This harmful effect may be associated with the presence of artificial colorings, such as Allura Red Ac (INS-129), which is commonly added to food candies. Therefore, industries must follow the standards established by the National Health Surveillance Agency (ANVISA), since excess of the Acceptable Daily Intake (ADI) of this dye can cause potential adverse risks, such as hypersensitivity reactions, similar to allergies, hyperactivity in children, as well as the risk of developing inflammatory diseases in the intestine, making it important to develop methods to quantify this dye in foods. Faced with this problem, the objective is to develop a sustainable analytical methodology capable of carrying out the determination and quantification of the Allura Red Ac dye in food candies, through a simple, easy-to-execute and economically accessible method, using the UV-Vis Spectrophotometry technique.. When carrying out the experimental analyses, analytical curves were obtained with standard solutions of the Allura Red Ac dye, where the relationship between the intensity of the coloring as a result of the increase in the concentration of the analyte was verified, thus obtaining a linear correlation between absorbance versus concentration, with coefficient of determination (R2) in analyzes by UV-Vis molecular absorption spectrophotometry. Quantification of three different bullets was carried out in three analytical protocols: I) the reference method of the Adolfo Lutz Institute that uses ammonia methanol; the proposed method using water as a solvent; III) the Adolfo Lutz Institute reference method with adaptations. A higher dye concentration was observed when the proposed method was used, with Confidence Level = 95%. Thus, it was possible to quantify the Red allura Ac dye in ten food candies sold in Brazil through Quimica Verde. The proposed method has the potential to be implemented as a routine method in the quality control of commercial candies.Item Determinação de micronutrientes metálicos em fertilizantes minerais por espectrofotometria de absorção atômica(2021) Medeiros, Rebeca Yasmim dos Santos; Mélo, Ralini Ferreira de; http://lattes.cnpq.br/4296426234246190; http://lattes.cnpq.br/2071405438089948Item Influência do espectro de luz em plantas de pimenta biquinho (Capsicum chinense)(2020) Limeira, Sérgio Feliciano; Coelho Júnior, José Machado; http://lattes.cnpq.br/6906686277921650Item Estudo do efeito de matriz na determinação de fósforo em espécies arbóreas de floresta tropical seca por espectrofotometria com azul de molibdênio(2019-07-25) Assunção, Edilane Alice de Alcântara; Freire, Fernando José; http://lattes.cnpq.br/8371992516325399; http://lattes.cnpq.br/3298059299648343Dry tropical forest soils have a shortage of phosphorus. Tris nutrient after absorption by plants, is returned to the soil by the nutrient cycling process, an ecosystem process essential for the conservation of forest ecosystems. Thus, the analysis of leaf material and the nutritional status of leaves are important because they allow understanding the dynamics and maintenance of forest ecosystems. The visible spectrophotometric method with molybdenum blue stands out in the determination of phosphorus, mainly due to its level of sensitivity. However, the matrix effect during analysis may compromise the reliability of the results obtained. Given the above, this research aimed to evaluate the effect of matrix on the determination of phosphorus in tree species of dry tropical forest by spectrophotometry with Molybdenum Blue. The study included the two most representative species in the forest environment in Araripina, Pernambuco, in the dry and wet periods. Digestion of the plant material was performed with 98% sulfuric acid and 30% hydrogen peroxide in the presence of catalysts. The determination was made by molybdenum blue spectrophotometry, associated with standard addition and five matrix dilution ratios. The data showed a decrease in absorbance resulting from the matrix effect and consequently the quantified P content. The pH of the plant extract also affected the analytical determination of phosphorus, however, less significantly than the matrix effect. Samples submitted to matrix dilution and standard addition showed a more efficient phosphorus recovery. The species Croton Limae and Guapira Opposita presented higher phosphorus contents in the wet period, due to the influence of rainfall. Guapira Opposita was the species with the highest P content in both evaluation periods, and the one with the lowest influence of the matrix effect. Thus, the matrix effect influences the phosphorus quantification by the molybdenum blue method, especially in low P species. This effect can be minimized by using matrix dilution combined with standard addition.