3125227 documents found, page 8432 of 312523
Classificação de óleos vegetais comestíveis usando imagens digitais e técnicas ...
Milanez, Karla Danielle Tavares de MeloThis work presents a simple and non-expensive based on digital image and pattern recognition techniques for the classification of edible vegetable oils with respect to the type (soybean, canola, sunflower and corn) and the conservation state (expired and non-expired period of validity). For this, images of the sample oils were obtained from a webcam, and then, they were decomposed into histograms containing the...
Um microanalisador em fluxo batelada para determinação fotométrica de sulfitos ...
Tavares, Márcio Rennan SantosSulfites are chemical additives major role in the beverage industry, however, the excessive use of these additives can cause disease and its limit is a maximum of 0,7 mg/kg of body weight per day SO2. This study proposes a micro-batch-flow analyser (μFBA) for photometric determination of sulphites in beverages. The μFBA was built from the commercial urethane-acrylate resin and polymerized exhibiting photo of ul...
Hidroxiapatita como sistema para liberação de ibuprofeno
Pereira, Mariana de Brito BatistaHydroxyapatite has been explored as an excellent biomaterial due its compatibility with the bone tissue, mainly with application to the drug adsorption. This work aimed to synthesize hydroxyapatite with controlled porosity, through co precipitation method using casein as template and to investigate the loading capacity of the ibuprofen in the obtained hydroxyapatite. Therefore in this study, it was synthesized ...
Avaliação de porfirinas na determinação simultânea de cátions por espectofotome...
Nino, Ivson de CarvalhoIn this work, we have investigated the use of porphyrins as non-selective complexing agents for the simultaneous determination of cations Pb2+, Zn2+, Cu2+, Mn2+, Co2+, and Hg2+ employing first-order multivariate calibration. At first, given its widespread availability and lower cost, the 5,10,15,20-tetraphenylporphyrin (H2TPP) was used in organic medium to complex cations in aqueous medium. Due to the instabili...
Sr1-xBaxSnO3 avaliação fotocatalítica de pós e filmes finos obtidos por PLD
Sales, Herbet BezerraBarium stannate (BaSnO3) and strontium stannate (SrSnO3) are perovskites type oxyde that have cubic (Pm3m) and orthorhombic (Pbnm) structures, respectively. These materials have received much attention due to their interesting physical and chemical characteristics, leading to a variety of technological applications. In this sense, these two materials were combined to each other in order to obtain powders and th...
Avaliação dos parâmetros químicos e potencial antioxidante do mel de jandaíra
Silva, Gerlania Sarmento daThe Jandaira bee( Meilipona subnitida D. ) it is a typical backcountry meliponineo and its considered endemic of northeastern Caatinga . Honey is appreciated by native populations, have a high commercial value and excellent quality (taste, smell, color, nutritional value, therapeutic, etc.), But is not well known in terms of chemical composition. This study aimed to determine the physicochemical characteristics...
Estudos da relação quantitativa estrutura-atividade (QSAR) de adutos de Morita-...
Alencar Filho, Edilson Beserra deThe Morita-Baylis-Hillman Adducts (MBHA) is a class of molecules studied by our research group on synthetic, theoretical and bioactivity aspects. In this work, we present Quantitative Structure-Activity Relationship (QSAR) models involving 32 aromatic MBHA. Initially, the most stable conformations of thirty-two MBHA were investigated by theoretical methods, which were used to construct models. For this study, w...
Fenotipagem não destrutiva usando espectroscopia no infravermelho próximo e qui...
Santos, Maria Betania Hermenegildo dosIn this work we used the near infrared spectroscopy (NIR) and chemometric tools to develop e classification models of two different cultivars of castor bean BRS Nordestina (N) and BRS Paraguaçu (P). It was also studied the feasibility of calibration models for ricin content in seeds prediction of three cultivars of castor bean (BRS Nordestina, BRS Paraguaçu and BRS Energia). Diffuse reflectance spectra were rec...
Síntese, caracterização e avaliação catalítica do aluminossilicato mesoestrutur...
Pereira, Francisco de Assis RodriguesMolecular sieves have been applied to the processing of triacylglycerols, to produce biofuels. In this context, the mesoporous catalyst Al-MCM-41 was proposed in this work as an alternative to acid heterogeneous transesterification of cottonseed oil with ethanol. This material was prepared using various Si/Al molar ratios (25, 50, 75 and 100) with reaction times of 8, 10, 12 or 14 hours at 170°C. The solids wer...
Avaliação das Propriedades Fluído-dinâmicas e Estudo Cinético por Calorimetria ...
Rosenhaim, RaulThe present work aimed at investigating the biodiesel issuing from the transesterification of used frying oil with ethanol, via alkaline catalysis. Such investigation covers its thermo-oxidative stability during heating (thermal analysis and rheological properties) as well the kinetic profiles of the samples in the best oxidative induction time by the technique of Pressurized Differential Scanning Calorimetry (...