Growth performance of Nile tilapia, Oreochromis niloticus, fed diets containing levels of pyridoxine and haematological response under heat stress

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

Cost-effective composite electrode for the fast voltammetric screening and determination of riboflavin (B2) and pyridoxine (B6) in pharmaceuticals

Different solid composites made by mechanical dispersions of graphite particles into heated paraffin (from 65 to 80% graphite, in mass) were prepared and assessed in order to optimize their use in electrochemical and electroanalytical procedures for bioanalysis. Besides these, composites were also evaluated by thermoanalytical techniques aiming to study their conservation and long-term stability (over eight months without special care), among others. Best results were found at 80% m/m graphite in paraffin. Such electrode combines low-cost, stability, sensitivity, ease of maintenance and clearance, besides the possibilities of manufacture in many different forms and shapes (with or without modifications) and applicability in a wide range of pH. Electrochemical studies by different voltammetric techniques involving vitamins from complex B (riboflavin and pyridoxine) leaded to a better understanding about their electrooxidative processes onto carbon-composite electrodes, specially regarding reversibility and pH-dependence. Data were also acquired and optimized with analytical purposes, being square-wave voltammetry in pH 4.2 chosen by its many advantages. Good linearity between peak responses as function of concentration were reached from 5 to 43 μmol L-1 for riboflavin (peak at -0.257 V) and up to 8.5 × 10-4 mol L -1 for pyridoxine (peak at +1.04 V), best studied conditions; limits of detection (at an S/N of 3) for both analites showed to be circa 1.0 mol L-1. Different commercial samples were analyzed for riboflavin (EMS® complex B syrup) and pyridoxine (Citoneurin 5000 Merck® ampoules) providing 96.6% and 98.7% recoveries, respectively.

Desempenho de Lecanicillium lecanii em meios de cultura contendo vitaminas e concentrações de extrato de levedura

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

Hepatoprotective treatment attenuates oxidative damages induced by carbon tetrachloride in rats

The present study evaluated the hepatoprotective effect of an N-acetyl or-methionine + choline chloride + caffeine + thiamine hydrochloride + nicotinamide + pyridoxine hydrochloride compound at doses of 0.2, 0.6 and 1.0 mL/kg of b.w., and the assessment was done by the investigation of serum-enzymatic activity, metabolic functions of the liver and histophatological changes in female Wistar rats, which were subjected to experimental intoxication with CCl4. One hundred and nineteen rats were randomly distributed into 17 groups, performing five different treatments, being evaluated seven animals per treatment in four periods: 2, 4, 6 and 8 days after CCl4-induced intoxication. Treated rats with the hepatoprotective medicine (HM) presented a significant reduction in infiltration of inflammatory cells, steatosis, necrosis and liver congestion when compared to non-treated rats (control). Beside these results, the treatment showed a positive effect on circulatory alterations in the intoxicated animals, with reduction of spleen and renal congestion, as well as, promotion of a significant improvement in ALT, AST, LDH, ALP, GGT enzymatic serum activity reduction and in recovering liver function regarding the metabolism of urea, triglycerides and glucose. These findings indicate therapeutic usefulness of the compound when administered at dose 0.6 and 1.0 mL/kg of b.w. in female Wistar rats. (C) 2010 Elsevier GmbH. All rights reserved.

Mastalgia cíclica pré-menstrual: placebo versus outras drogas

Os autores definem mastalgia cíclica pré-menstrual, (MCPM), repassam os principais mecanismos do ciclo celular da mama, e com base nestes conhecimentos propõem a sua classificação em três tipos, segundo a fisiologia do ciclo mamário: tipo 1 - caracterizado pela distensão localizada de ductos e adensamento do tecido conjuntivo em volta de pequenas dilatações. tipo II - caracterizado pelo edema intersticial, e tipo III - caracterizado pela combinação dos dois processos etiopatogênicos. OBJETIVO: Por meio de estudo prospectivo, aleatório, triplo cego e controlado, comparar a ação de placebo com associação de vitaminas A-D-E e doses baixas de ácido acetilsalicílico. MÉTODOS: Foram observadas 259 portadoras de MCPM, acompanhadas durante seis meses para estudo comparativo das drogas empregadas no alívio da dor. Destas, foram selecionadas 81 pacientes por critérios rigorosos, divididas em três grupos de 27, que receberam, respectivamente, aspirina, associação de vitaminas e placebo. A dor foi classificada em grau I (sem dor), grau II (dor moderada) e grau III (dor intensa). Os métodos estatísticos realizados mostraram que o número de pacientes em cada grupo era satisfatório. Foi empregado o teste de Tukey para comparação dos resultados e significância a 5%. RESULTADOS: As características clínicas, idade, peso, altura e IMC, antecedentes obstétricos e duração da amamentação foram semelhantes nos três grupos. Houve redução de intensidade da dor nos três grupos, principalmente naquele que recebeu placebo. CONCLUSÃO: O estudo realizado, segundo metodologia aceitável, porque foi prospectivo, controlado, triplo cego e aleatório, não mostrou diferenças significativas no tratamento da mastalgia cíclica pré-menstrual entre aspirina e associação de vitaminas, mas revelou superioridade do placebo.

Hiperoxalúria primária com insuficiência renal crônica terminal em lactente

Objetivo: descrever caso clínico de um lactente com insuficiência renal crônica terminal, causada por hiperoxalúria primária.Método: após revisão da literatura, verifica-se a raridade da doença; na França, a prevalência é de 1,05/milhão, com taxa de incidência de 0,12/milhão/ano. Pesquisa abordando centros especializados mundiais detectou, em 1999, 78 casos em lactentes; destes, em 14% o quadro inicial foi de uremia. A gravidade e a raridade da doença sugerem o relato deste caso.Resultados: criança de sexo feminino, com quadro de vômitos e baixo ganho de peso desde os primeiros meses de vida, desenvolveu insuficiência renal terminal aos 6 meses de idade, sendo mantida em tratamento dialítico desde então. Aos 8 meses, foi encaminhada para esclarecimento diagnóstico, apresentando déficit pôndero-estatural grave e os seguintes exames laboratoriais: uréia= 69 mg/dl, creatinina=2,2 mg/dl e clearance de creatinina= 12,5 ml/min/1.73m²SC. O exame de urina foi normal, a ultra-sonografia renal revelou tamanho normal e hiperecogenicidade de ambos os rins. A dosagem de oxalato urinário foi de 9,2mg/kg/dia ou 0,55 mmol/1.73m²SC, e a relação oxalato:creatinina, de 0,42. A biópsia renal diagnosticou presença de grande quantidade de depósitos de cristais de oxalato de cálcio no parênquima renal. A radiografia de ossos longos evidenciou sinais sugestivos de osteopatia oxalótica, e a fundoscopia indireta, sinais de retinopatia por oxalato. A criança foi mantida em diálise peritoneal ambulatorial contínua, tendo sido iniciado tratamento com piridoxina.Conclusões: a hiperoxalúria primária deve ser considerada como um dos diagnósticos diferenciais de insuficiência renal crônica em lactentes, especialmente na ausência de história sugestiva de outras patologias.

Efeito do tratamento com algumas vitaminas B na potencializaçã o do efeito antiinflamatório e antinociceptivo do diclofenaco e da talidomida

The effects of some B vitamins on chemical nociception in mice or paw edema in rats were investigated. A combination of thiamine (B1), pyridoxine (B6) and cyanocobalamin (B12), in doses of 100,100 and 5mg/kg, i.p., respectively, potentiated the inhibition by diclofenac or thalidomide of paw edema induced by carrageenin in rat. Antinociceptive effects of diclofenac and thalidomide inhibition of abdominal contortion were also potentiated by the combination of the vitamins B1, B6 and B12. Thiamine, pyridoxine and cyanocobalamin given singly were effective in potentiating antinociceptive effects of thalidomide, but only cyanocobalamin potentiated these effects of diclofenac, probably reflecting the differing mechanisms of action of the two drugs. The results document the positive influence of B vitamins on antinociceptive effects of diclofenac or thalidomide and support the use of B vitamins to shorten the treatment time and reduce the daily dose of anti-inflammatories.

Potencialização do efeito antiinflamatório e antinociceptivo do diclofenaco e da nimesulida por vitaminas do complexo B

The effects of a combination of some B vitamins and diclofenac or nimesulide on chemical nociception in mice or paw edema in rats were investigated. While the vitamins alone had no effect, combination of thiamine (B1), pyridoxine (B6) and cyanocobalamin (B12), given i.p. in doses of 100mg and 5mg/kg, respectively, potentiated the inhibition by nimesulide (5mg/kg) of paw edema induced by carrageenin in rats. Antinociceptive effects of diclofenac and nimesulide (inhibition of abdominal writhing induced by acetic acid in mice) were also potentiated by the combination of the vitamins B1, B6 and B12. Thiamine, pyridoxine and cyanocobalamin given singly were effective in potentiating antinociceptive effects of nimesulide, but only cyanocobalamin potentiated these effects of diclofenac, probably reflecting the differing mechanisms of action of the two drugs. The results document the positive influence of B vitamins on the antinociceptive effects of diclofenac or nimesulide and support the use of B vitamins to shorten the treatment time and reduce the daily dose of anti-inflammatories.

Tratamento hepatoprotetor favorece a resposta leucocitária de ratos wistar intoxicados por CCL4

The aims of this investigation was to evaluate the effect of hepatoprotective treatments with a compound prepared by the association of N-Acetyl DL-Methionine (5%) + Choline chloride (2%) + Caffeine (1%) + Thiamine hydrochloride (1%) + Nicotinamida (0,5%)+ Pyridoxine hydrochloride (0.04%), administered through intramuscular (IM) route, at doses of 0.2, 0.6 and 1.0 mL/kg of BW, through the study of leukocytes responses in rats submitted to acute intoxication with CCl4. 147 females were randomized into 21 groups, performing five different treatments, which were evaluated seven animals in four periods: two, four, six and eight days after CCl4-induced intoxication. In this study, it was observed absolute eosinophilia and monocytosis in animals untreated and treated with the lowest dose of 0.2 mL. These responses were significantly better in animals treated with 0.6 and 1.0 mL/ kg BW. The untreated animals showed thrombocytopenia, when compared to treated animals. Absolute neutropenia and lymphocytosis was observed in all rats intoxicated with CCl4, there is no difference among treatments. The analysis of white blood cells demonstrated that the hepatoprotective treatments favored the leukocyte response, by act beneficially on the population of these cells, supporting the hypothesis that these events may reduce the deleterious effects in liver tissue after intoxication by CCl4.

Development and application of a highly selective biomimetic sensor for detection of captopril, an important ally in hypertension control

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

Suplementação de vitamina B6 em dietas práticas e purificadas no desempenho produtivo e resposta hemática da Tilápia do Nilo submetida a estímulo térmico

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

Estudo de filmes poliméricos de complexos a base de tiofeno8Schiff na construção de sensores eletroquímicos

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

Preparação e aplicações eletroanalítica de nanopartículas de pentaciano metais de transição

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)