Preparação, caracterização e aplicações eletroanalíticas de silsesquioxanos e dendrímeros modificados suportados na superfície da sílica gel

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Preparação, caracterização e aplicação de materiais nanoestruturados suportados em sílica gel

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Speciation analysis of inorganic arsenic in river water by Amberlite IRA 910 resin immobilized in a polyacrylamide gel as a selective binding agent for As(v) in diffusive gradient thin film technique

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

An electroanalytical application of 2-aminothiazole-modified silica gel after adsorption and separation of Hg(II) from heavy metals in aqueous solution

2-Aminothiazole covalently attached to a silica gel surface was prepared in order to obtain an adsorbent for Hg(II) ions having the following characteristics: good sorption capacity, chemical stability under conditions of use, and, especially, high selectivity. The accumulation voltammetry of mercury(II) was investigated at a carbon paste electrode chemically modified with silica gel functionalized with 2-aminothiazole (SIAMT-CPE). The repetitive cyclic voltammogram of mercury(II) solution in the potential range -0.2 to + 0.6 V versus Ag/AgCl (0.02 mol L-1 KNO3; V = 20 mV s(-1)) show two peaks one at about 0.1 V and other at 0.205 V. The anodic wave peak at 0.205 V is well defined and does not change during the cycles and it was therefore further investigated for analytical purposes using differential pulse anodic stripping voltammetry in differents supporting electrolytes. The mercury response was evaluated with respect to pH, electrode composition, preconcentration time, mercury concentration, cleaning solution, possible interferences and other variables. The precision for six determinations (n = 6) of 0.02 and 0.20 mg L-1 Hg(II) was 4.1 and 3.5% (relative standard deviation), respectively. The detection limit was estimated as 0.10 mu g L-1 mercury(II) by means of 3:1 current-to-noise ratio in connection with the optimization of the various parameters involved and using the highest-possible analyser sensitivity. (c) 2006 Elsevier Ltd. All rights reserved.

Proteinograma sérico de veados-catingueiro (Mazama gouazoubira) criados em cativeiro obtido por eletroforese em gel de agarose e de poliacrilamida (SDS PAGE)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Proteinograma sérico de bezerros recém-nascidos da raça Holandesa obtido por eletroforese em gel de poliacrilamida

The serum protein concentration of newborn Holstein calves determined by means of sodium dodecyl sulphate-polyacrylamide (SDS-PAGE) was studied. Blood samples from 40 healthy newborn calves were obtained 48 hours after birth. Calves had been given 3 liters of colostrum within 2 hours after birth, following by dose corresponding by 15% of animal weight each 24 hours. The results showed three different proteinograms: 19 calves had 14 proteins with molecular weights (MW) ranging from 28,000 D to 170,000D (proteinogram 1); 11 calves had 14 proteins with MW ranging from 18,000 to 170,000 D (proteinogram 1); and 10 calves had 12 proteins with MW ranging from 28,000 D to 170,000 D (proteinogram 3). The three groups presented similar IgG levels. The highest serum concentration of ceruloplasmin were verified in proteinogram 3, which had the lowest serum level of protein with MW 58,000D. It was verified a1-antitrypsin only in proteinogram 2, which had no proteins with MW of 42,000 D and 37,000D. The highest serum concentrations of IgA and protein with MW 58,000 D, and the lowest serum levels of transferrin, haptoglobin, and acid glycoprotein were verified in proteinogram 3. Measurement of serum protein concentrations by SDS-PAGE may be useful in monitoring the occurrence of hypogammaglobulinemia and the neonatal disease in calves.

Proteinograma sérico de cães sadios e com linfoma obtido por eletroforese em gel de poliacrilamida (SDS-PAGE)

Foram avaliadas amostras de soro sanguíneo de 10 cães sadios e de 12 com linfoma, utilizando-se a eletroforese em gel de poliacrilamida contendo dodecil sulfato de sódio. Houve diferença entre as médias dos teores de proteína total de cães sadios, 7,68g/dL±0,46 e de cães com linfoma, 7,93g/dL±2,49. As concentrações de IgA e IgG não foram diferentes entre os grupos. Os teores das proteínas de pesos moleculares 142000, 110000, 52000, 49000, 24000 e 18000 dáltons foram mais elevados em cães com linfoma. Os cães com linfoma apresentaram concentrações mais elevadas de ceruloplasmina, 43,95mg/dL±18,19, e haptoglobina, 554mg/dL±449,51, e menores de albumina, 2908mg/dL±476,67, em comparação aos cães sadios (ceruloplasmina: 3,42mg/dL±7,44; haptoglobina: 94,54mg/dL±59,50 e albumina: 4207mg/dL±206,18). Conclui-se que concentrações séricas mais elevadas de ceruloplasmina e haptoglobina e menores de albumina podem estar associadas ao linfoma em cães.

Influência do puerpério sobre o proteinograma sérico de caprinos da raça Saanen obtido por eletroforese em gel de poliacrilamida

Aiming to evaluate the puerperal influence on the proteinogram of Saanen goats, 108 samples of blood serum from 12 goats were collected, and the results were presented at nine times: just after parturition, 1, 3, 5, 7, 10, 15, 21 and 30 days after parturition. Total amount of serum proteins were determined by the biuret technique, and the sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE) was used to the protein fractionation. In this last method, 17 protein bands were observed, from which molecular weights varied between 25 KDa and 275 KDa. In addition, it was possible to identify the following protein fractions: immunoglobulin A (180 KDa), ceruloplasmin (115 KDa), transferrin (79 KDa), albumin (65 KDa), heavy-chain immunoglobulin G (58 KDa), haptoglobin (45 KDa), acid glycoprotein (37 KDa) and light-chain immunoglobulin G (28 KDa). Another 9 nonidentified protein fractions presented, each molecular weights equal to 275 KDa, 140 KDa, 125 KDa, 103 KDa, 95 KDa, 41 KDa, 35 KDa, 30 Kda and 25 KDa. The results allow us to conclude that by the first week of puerperium, an improvement of acid glycoprotein occurs, whereas those others protein fractions do not suffer any puerperal influence.

A comparison of two agar gel immunodiffusion methods and a complement fixation test for serologic diagnosis of Brucella ovis infection in experimentally infected rams

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Voltammetric performance and application of a sensor for sodium ions constructed with layered birnessite-type manganese oxide

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Numerical simulation of the liquid phase in SnO2 thin film deposition by sol-gel-dip-coating

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Immobilization of streptavidin in sol-gel films: Application on the diagnosis of hepatitis C virus

Recent advances have accelerated the development of biosensors for the analysis of specific gene sequences. In this kind of biosensor, a DNA probe is immobilized on a transducer and the hybridization with the target DNA is monitored by suitable methodology. In the present work, the streptavidin (STA) was encapsulated in thin films siloxane-poly(propylene oxide) hybrids prepared by sol-gel method and deposited on the graphite electrode surface by dip-coating process. Biotinylated 18-mer probes were immobilized through STA and a novel amperometric DNA biosensor for the detection and genotyping of the hepatitis C virus (genotypes 1, 2A/C, 2B and 3) is described. The HCV RNA from serum was submitted to reverse transcriptase-linked polymerase chain reaction (RT-PCR) and biotin-labeled cDNA was obtained. Thus, the cDNA was hybridized to the target-specific oligonucleotide probe immobilized on the graphite electrode surface and following the avidin-peroxidase conjugate was added. The enzymatic response was investigated by constant potential amperometry at -0.45 V versus Ag/AgCl using H2O2 and KI solutions. HCV RNA negative and positive controls and positive samples of sera patients were analyzed and the results were compared to commercial kit. The proposed methodology appeared to be suitable and convenient tool for streptavidin immobilization and diagnose of HCV disease. (c) 2006 Elsevier B.V. All rights reserved.

Endurance training stimulates growth and survival pathways and the redox balance in rat pancreatic islets

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)