http://localhost:8080/handle/prefix/56 Wed, 11 Nov 2026 10:11:35 GMT 2026-11-11T10:11:35Z http://repositorio.ufrr.br:8080/jspui/retrieve/323/ppgq.png http://localhost:8080/handle/prefix/56 http://localhost:8080/handle/prefix/109 Title: Avaliação química, físico-química e ensaios biológicos do óleo da polpa de inajá Maximiliana maripa (Aubl.) Drude) Arecaceae Autor(es): Mozombite, Diana Maruja Sangana Primeiro Orientador: Melo Filho, Antonio Alves de Abstract: . Publisher: Universidade Federal de Roraima Tipo: Dissertação Fri, 01 Jan 2016 00:00:00 GMT http://localhost:8080/handle/prefix/109 2016-01-01T00:00:00Z http://localhost:8080/handle/prefix/87 Title: Desenvolvimento e validação de método multi-resíduos de pesticidas em tomate (Lycopersicum esculentum Mill) in natura por cromatografia líquida de alta frequência (CLAE) Autor(es): Santos, Viviane Belo dos Primeiro Orientador: Silva, Henrique Eduardo Bezerra da Abstract: In the last years, the consumption of vegetables and fruits in the world increased, as well as the increase in the use of defensive agricultural to guarantee that production. As a result a growing concern of the citizens and of the scientific community related with the presence and control of residues of pesticides in those products to evaluate the potential risks to the health of the population has occurred. To measure the potential health risk of the population preventive measures are being established so that the undesirable effects are maintained in compatible levels with the life, and also the protection of the cultivated areas. Due to that concern, programs of monitoring of random sampling and the analysis of raw foods and processed at the market are willing to investigate and develop methods which determine this compound in different formers. The objective of this work was to investigate the carbamate occurrence in the acquired samples of tomatoes at the Feira do Produtor, in the State of Roraima, using the technique of the extraction in solid phase for cleaning of the samples and the liquid chromatography of the studied samples. The results indicate that the HPLC/UV-vile procedure resulted in adequate lineal strip, with accuracy, precision and sensibility is adapted for the analysis of residues of pesticides in the tomatoes. The detected limits vary from 1,15 x 10-6 to 9,71 x 10-6 mg L-1 and quantification from 1,15 x 10-6 to 6,23 x 10-5 mg L-1 for all the pesticides studied. The recovery rates obtained for each pesticide ranged from 70 to 100 %, except for the third sample of the pesticide carbofuran (60 %) in which the coefficient of varied less than 20 %. Calibration curves were obtained r2 = 0.999 for nearly all pesticides. The method found that the samples of tomatoes, there were various types of carbamates residues, but most were above the limits established by Brazilian legislation. Publisher: Universidade Federal de Roraima Tipo: Dissertação Wed, 20 Mar 2013 00:00:00 GMT http://localhost:8080/handle/prefix/87 2013-03-20T00:00:00Z http://localhost:8080/handle/prefix/86 Title: Avaliação de partes distintas do tambaqui (colossoma macropomun) e aproveitamento de seus resíduos na produção de biodiesel Autor(es): Sousa, Sueli Caetano de Primeiro Orientador: Costa, Luiz Antonio Mendonça Alves da Abstract: Due to the need to expand the energy supply, there is an increasing search for renewable energy. Vegetable oils, animal fats, recovered cooking oils and wastes from fish production are being appraised. The present work aimed evaluate, by different extraction methods, the yield of oil from different parts from the Tambaqui (Colossoma macropomum), including its wastes, determine the fatty acid composition of oils obtained and produce biodiesel taking advantage of this fish wastes. In this work we evaluate methods of oils in cold extraction, with fresh material using the Folch method and extraction with hexane; Cold extraction, using dehydrated material utilizing the Duarte modified methodology and finally the conventional Soxhlet extraction. The oils obtained were initially analyzed by thin layer chromatography (TLC) and immediately converted to the respective methyl esters of fatty acid. It was also extract oils from the Tambaqui offal, by heating in a stove at 60º C. The oil used in biodiesel production was submitted to physicochemical analysis, immediately esterified by the Fischer method using methanol, to reduce its acidity, and immediately submitted to alkaline transesterification. The fatty acid composition, from de oils obtained and from biodiesel, was determined by gas chromatography utilizing flame ionization detector (GC-FID). The biodiesel properties were determined according to instructions from the Brazilian National Agency of Petroleum, Natural Gas and Biofuels (ANP) by the resolution Nº 7, 2008. According to the results obtained, the oil extraction method that presented the best yield was the Duarte modified methodology (12.31%) while the Folch method and the extraction with hexane presented yield of less than 2%. By Sokhlet extraction, using diverse samples from Tambaqui (fillet, head and wastes mixture), it was obtained a yield of 42.48%, 42.87%, 41.87%, respectively. From the Tambaqui offal, by the heating in a stove, it was obtained a yield of 46.78% of oil. The physicochemical results indicated hight acidity for the wastes mixture oils (1.62%) in relation to offal oil (0.49%). The saponification value for offal oil was 163.86 mg of KOH/g lower than that found in the literature for fish oil (189-193). The chromatography results present differences both in biodiesel oils chemical composition, as in this constituents’ proportion. The major fatty acid determined in the samples were oleic (C18:1 ω-9) and palmitic (C16:0). The biodiesel presented aspect, bulk density, kinematic viscosity within the limits set by the ANP, being that the determined flash point was well above the recommend minimum, an indication that biofuel produced presents a low risk of flammability, however the acid value and the oxidative stability found themselves out of the pre-established parameters. Therefore, the Tambaqui offal oil shows promise for biodiesel production, although there is a need to expand the study. Publisher: Universidade Federal de Roraima Tipo: Dissertação Sat, 29 Mar 2014 00:00:00 GMT http://localhost:8080/handle/prefix/86 2014-03-29T00:00:00Z http://localhost:8080/handle/prefix/85 Title: Estudo fitoquímico e atividade biológica de Aegiphila integrifolia (Jacq.) Autor(es): Prado, Simonia Aparecida Lima do Primeiro Orientador: Nascimento, Francisco das Chagas Abstract: This dissertation presents the phytochemical study and biological evaluation of the ethanol extract of Aegiphila integrifolia (Jacq.) belonging to the family Lamiaceae. The phytochemical study of clorofómico eluate of ethanol leaf extract led to the isolation and identification of a mixture of fatty acids as their methyl esters, a mixture of, β - sitosterol, stigmasterol and lupeol glycosylated a flavonoid known as Pectolinarigenin. Mixtures of methyl esters were analyzed and determined by gas chromatography. Structural determinations were made by means of spectroscopic methods such as mono-and two-dimensional IR, 1H NMR (500 MHz), 13C NMR (125 MHz), HSQC, HMBC, ESI-MS and comparison with literature data. The biological study of the ethanol extract showed a good result for antioxidant activity by DPPH method compared to standard quercetin. The investigation of the toxicity of the test conducted according front Artemia salina indicated low toxicity (LD 50 % up to 500 mg mL-1) and compared to values found in literature confirming the low toxicity of the genus Artemia salina front Aegiphila. The MIC tests for filamentous fungi, Gram - Positive and Gram-Negative Bacteria and yeast showed low inhibition compared with Ampicillin antibiotics except the yeast Candida albicans. This inhibition was satisfactory, approximately 96% to RR05 sample (the flavonoid) and 92% for sample R06 (ethanol extract) comparing antibiotic Nystatin and Miconazole (91%). Publisher: Universidade Federal de Roraima Tipo: Dissertação Thu, 24 Apr 2014 00:00:00 GMT http://localhost:8080/handle/prefix/85 2014-04-24T00:00:00Z