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 Utilização de ômega 3 e 6 na alimentação de cães(2020-11-05) Silva, Izadora Emanuelle Oliveira da; Lima, Tayara Soares de; http://lattes.cnpq.br/3100045021780173; http://lattes.cnpq.br/0216194620740503The absence of essentials nutrients in the future brings diseases that can compromise not only the health, but the life of the animals. Fatty acids (AG) are lipid components and are distributed in all tissues, mainly in cell membranes and fat cells. Among these, those classified as essential as the polyunsaturated fatty acids n-3 and n-6. The fetus and even the puppies after the first days of birth are not able to synthesize long-chain polyunsaturated fatty acids (ômega 3 and 6), and their need is met by the placenta and the dog's milk if supplemented. Growing puppies need a percentage of 0.08% alphalinolenic acid. Maintenance dogs need a lower percentage. The omega 3 and 6 fatty acids act in the supply of concentrated energy, energy reserve in the animal organism, source of essential fatty acids, important for the nervous system, natural insulator to the environment. Its absence can cause, reduced growth, worse feeding efficiency, dry skin, dermatitis, hair loss, delayed sexual maturity, less fertility, accumulation of fat in the liver, less recovery in periods of convalescence, low resistance to various diseases such as coronary and cancer. These acids have unsaturations separated by a methylene carbon and listed from the final methyl group, and can also be listed from the carboxyl according to the delta designation using the nutritional designation n. Acids can also influence triglyceride and cholesterol levels. These are also responsible for the production of eicosanoids and prostaglandins. The objective was to carry out a bibliographic review on the use of fatty acids in the nutrition of dogs, seeking to document the development of research in relation to this essential nutrient.Item Perfis de ácidos graxos do leite em animais de interesse zootécnico: revisão literária(2022-06-02) Carvalho, Paloma Adolfo de; Soares, Luciana Felizardo Pereira; http://lattes.cnpq.br/4071178363761831Milk is a product that has great consumption in the world. It is used for food in many communities, as well as being an important ingredient to be used with various types of dishes. Thus, milk fats in milk and dairy products are important sources of nutrients and energy for the population. Different animal species produce quality milk, with different fatty acid compositions, as the composition of a ruminant's diet is one of the factors that can cause changes in milk fatty acids. Thus, targeted modification of ruminant diets can be used to produce milk with a desirable fatty acid profile. A focus on improving the nutrition of these animals directly implies the final product.Item Extração e caracterização de extratos lipídicos obtidos da biomassa de Tetradesmus (Scenedesmus) obliquus com propriedades antimicrobianas(2021-07-15) Ferreira, Millena Patrício do Nascimento; Bezerra, Raquel Pedrosa; http://lattes.cnpq.br/1466206759539320; http://lattes.cnpq.br/1713734083159044Microalgae have become a source promising renewable energy, in addition it provides bioactive substances such as carbohydrates, proteins, vitamins and lipids. Lipids perform several biological functions and are fundamental to the survival of most living beings. Extraction is an important step in the process of obtaining lipids from microalgal biomass and can be performed in different ways in order to achieve greater yield and cost-benefit. This study performed the extraction and characterization of the lipid extract from the biomass of Tetradesmus obliquus and evaluated its antimicrobial property. Microalgae was cultivated in Erlenmeyers flasks for 15 days until it reached the stationary phase of cell growth. The dry biomass remained in contact with the solvents hexane, ethyl acetate and ethanol P.A, all with different polarities, for 48 hours in which the lipid yield and the fatty acid profile were determined by gas chromatography. Extracts of hexane (EHT), ethyl acetate (EAT) and ethanol (EET) were subjected to antimicrobial activity at concentrations of 100, 50, 25, 12.5, 6.25 and 3.12 mg/mL against bacteria Staphylococcus aureus, Klebsiella pneumoniae e Escherichia coli. EET obtained the highest lipid yield with 1.49±0.01% in the first extraction, while EAT obtained 1.22±0.02% and EHT yielded 0.52±0.03%. In a second extraction EHT doubled the yield with 1.17±0.00% and EAT managed to reach 2.47±0.00%, presenting better results with an reextraction. The essential fatty acids most present in the extracts were α-linolenic (15.4% to 19.9%) and oleic acid (5.74% to 8.93%), which are most present in the extract EHT and EAT. EAT managed to achieve better results by inhibiting the growth of all bacteria to the lowest concentration. EHT was positive until the concentration of 6.25 mg/mL and EET only managed to totally inhibit the growth of the E.coli bacteria at the concentration of 100 mg/mL. So far, it can be concluded that the ethyl acetate solvent is more suitable for extraction of T. obliquus lipids with antimicrobial activity.Item Avaliação das concentrações dos ácidos e ésteres graxos na produção de biodiesel de óleo de soja por transesterificação alcalina(2019-02-05) Gusmão, Amanda de Sena; Souza Filho, Manoel de Farias; Silva, Benjamim Henrique de Lima e; http://lattes.cnpq.br/9229641856436016; http://lattes.cnpq.br/2399784507334824; http://lattes.cnpq.br/3454183782800995Biodiesel, a biofuel alternative to petroleum diesel, consists of a mixture of monoalkyl esters of fatty acids. The most common method of obtaining biodiesel is through the reaction of alkaline transesterification of oleaginous or animal fat with alcohols of short chains, such as methanol and ethanol. Transesterification for biodiesel production is a process involving mass transfer and chemical reaction effects. In this sense, alcohols (methanol or ethanol) and refined soybean oil were mixed in the alcohol: oil: 6: 1 molar ratio and stirred at 60 ° C with a stirrer speed of 600 rpm in order to analyze the mass transfer of the individual fatty acids from soybean oil to alcohol phase. Samples of the alcohol phase were collected at determined times, then they were transesterified using an analytical method and analyzed by gas chromatography. In the reactive process, biodiesel was produce from refined soybean oil, using the alcohols methanol and ethanol. The experiments were run under the conditions specified above, using sodium hydroxide as the catalyst at the concentration of 0.5% (w / w) relative to the oil. The evolution of alkyl esters concentrations (biodiesel) over time were obtain by gas chromatographic analysis. Comparative analysis was made of the temporal evolution and yields of the individual fatty esters. The analysis of the results showed that the fatty acids in higher concentrations in the raw material (C16:0; C18:1; C18:2) reached higher levels of mass transfer in the alcohol phase (ethanol, methanol). It was observe in the reactive systems that the esters of palmitic and linoleic acids were favored in the process, whereas those of oleic acids presented lower reactivity.