Produção de ácidos orgânicos por cepas leveduras assimiladoras de xilose

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Production of ginger vinegar

Vinegar is a food of condiments group that have great use in the food industry. This study aimed to evaluate the effects of parameters of the acetic fermentation process in the production of ginger vinegar. A suspension of ginger rhizomes with 12% of starch was subjected to enzymatic hydrolysis process to obtain hydrolyzed with 85.6% of glucose. After the alcoholic fermentation the wine was obtained with 40.3% ethanol. The acetic fermentation process of ginger alcoholic solution followed a completely randomized design in a factorial for three factors at two levels. The independent variables were: temperature, nutrients and proportion of "strong vinegar" and alcoholic solution (initial acidity). Results showed variation from 2.74 to 3.70% for dry extract and 2.13 to 2.83% for ash in vinegars. The profile of organic acids of ginger vinegars showed the presence of acetic, citric, malic and succinic acids in all treatments. The condition of 20 degrees C, initial acidity 1:1, with addition of nutrients allow obtaining good quality vinegars and higher GK yields.

Delayed tooth replantation after treatment of necrotic periodontal ligament with citric acid

Objective: to evaluated the effect of treating root-adhered necrotic periodontal ligament (PDL) with citric acid on the healing process in delayed rat tooth replantation. Material and Methods: Forty Wistar rats, assigned to 4 groups (n=10), had their upper right incisor extracted and kept dry on a workbench. For Group I (control), the teeth were replanted after a 5 min extra-alveolar time. For the other groups, replantation was hydroxide-based paste and the teeth were replanted with no root surface treatment. In Group III, the teeth were immersed in citric acid (pH 1) for replanted. In Group IV, instead of the immersion, the roots were scrubbed with gauze soaked in citric acid and the teeth were replanted. The animals difference (p > 0.05) was found among the groups regarding the areas difference (p < 0.05) between the control group and Group IV regarding ankylosis. The control group showed the least replacement resorption percent means compared to the other groups (p < 0.05). The root structure was more affected by replacement resorption and ankylosis in Group IV statistically (p > 0.05). Conclusion: the treatment of root surface-adhered necrotic periodontal ligament with citric acid was not able to prevent the delayed rat tooth replantation.

Delayed tooth repalantetion after treatment of necrotic periodontal ligament with citric acid

Objective: to evaluated the effect of treating root-adhered necrotic periodontal ligament (PDL) with citric acid on the healing process in delayed rat tooth replantation. Material and Methods: Forty Wistar rats, assigned to 4 groups (n=10), had their upper right incisor extracted and kept dry on a workbench. For Group I (control), the teeth were replanted after a 5 min extra-alveolar time. For the other groups, replantation was done after 60 min. In Group II, the root canals were filled with a calcium hydroxide-based paste and the teeth were replanted with no root surface treatment. In Group III, the teeth were immersed in citric acid (pH 1) for 3 min, the canals were filled with calcium hydroxide and the teeth were replanted. In Group IV, instead of the immersion, the roots were scrubbed with gauze soaked in citric acid and the teeth were replanted. The animals were sacrificed 60 days postoperatively. Results: Regarding replacement resorption, there was statistically significant difference (p < 0.05) between the control group and the other three groups. No statistically significant difference (p > 0.05) was found among the groups regarding the areas of inflammatory resorption. There was also a statistically significant difference (p < 0.05) between the control group and Group IV regarding ankylosis. The control group showed the least replacement resorption percent means compared to the other groups (p < 0.05). The root structure was more affected by replacement resorption and ankylosis in Group IV compared to the Groups II and III, but this difference was not significant statistically (p > 0.05). Conclusion: the treatment of root surface-adhered necrotic periodontal ligament with citric acid was not able to prevent the occurrence of ankylosis, root resorption and inflammatory resorption in delayed rat tooth replantation.

Ácidos orgânicos em dietas de suínos

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

Estabilidade do guacamole refrigerado elaborado com abacate ‘hass’ e diferentes formulações

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

Nanopartículas à base de óxido de zinco dopadas com magnésio e com superfície modificada para aplicação em bioimagem

O diagnóstico precoce de diversas doenças, principalmente o câncer, é fundamental para o seu combate. Atualmente, muitos avanços têm sido feitos na área de nanotecnologia no sentido de desenvolver sistemas com aplicação na área biomédica e em bioimagem para o diagnóstico de doenças. Nesse contexto, nano-cristais semicondutores de ZnO apresentam elevado potencial como marcadores para aplicações biológicas devido á suas propriedades luminescentes. A fotoluminescência de pontos quânticos (PQs) de ZnO envolve dois aspectos: a emissão excitônica fraca na região do UV e a ampla emissão visível induzida por efeito da superfície PQ. Estudos sinalizam que na síntese de nanopartículas de ZnO, a introdução de magnésio (Mg) como dopante leva a uma mudança significativa no tamanho e forma dos nano-cristais, potencializando as propriedades de luminescência. Entretanto, ainda é um desafio para os pesquisadores obter nanopartículas de ZnO aptas a serem incorporados em nanocarreadores e que sejam estáveis em meio biológico. Desta forma, este trabalho, apresenta como objetivo principal a obtenção de pontos quânticos de ZnO dopados com Mg e recobertos com ácido cítrico e 3-Glycidilpropriltrimetóxisilano (GPTMS) como modificadores de superfície para prover estabilidade em meio biológico. Eles poderão posteriormente ser incorporados em sistemas carreadores a fim de constituir sistemas estáveis com potencialização das propriedades luminescentes dos PQs e, portanto, aptos para aplicação como material de diagnóstico em sistemas biológicos