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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Esvaziamento gastrico de soluções de açucares e de leite de vaca sem e com acrescimo de carboidratos em ratos adultos

Machado, Fernando de Almeida 06 October 1995 (has links)
Orientador: Edgard Ferro Collares / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Ciencias Medicas / Made available in DSpace on 2018-07-20T18:08:46Z (GMT). No. of bitstreams: 1 Machado_FernandodeAlmeida_D.pdf: 2699170 bytes, checksum: c4091cce3dcc6e6257e79337cec38003 (MD5) Previous issue date: 1995 / Resumo: O presente trabalho teve como objetivo, numa primeira etapa, verificar, em ratos adultos, as retenções gástricas (RG) de soluções aqüosas de lactose, sacarose e maltose, todas na concentração a 10% (p/v), e a influência da associação combinada entre dois desses açúcares sobre o esvaziamento gástrico e, numa segunda etapa, verificar se essa influência se mantém quando se adiciona sacarose ou maltose ao leite de vaca integral. Foram utilizados 120 ratos Wistar machos com idade entre 8 a 10 semanas, que receberam suas respectivas refeições de prova por via oro gástrica, através de uma sonda metálica, no volume de 2 ml/l00 g de peso. As soluções de açúcares foram marcadas com fenol vermelho (6 mg/dl) e os leites foram marcados com PEG 4000 (2 g/dl). As RG foram determinadas calculando-se a quantidade de marcado retido no estômago, após leitura espectrofotométrica. Na primeira etapa do experimento, foram utilizados 48 animais, divididos eqüitativamente em 6 subgrupos, de acordo com a refeição de prova utilizada: lactose 10% (L), sacarose 10% (S), maltose 10% (M), lactose 5% + sacarose 5% (LS), lactose 5% + , maltose 5% (LM) e sacarose 5% + maltose 5% (SM) (p/v). A RG foi avaliada após 15 minutos da infusão orogástrica da refeição de prova. Na segunda etapa do estudo, foram utilizados 72 animais divididos em 3 subgrupos eqüitativos, de acordo com a refeição-de prova: leite de vaca integral sem acréscimo de açúcar, leite de vaca com sacarose 5% (p/v) e leite de vaca com maltose 5% (p/v). Para cada refeição de prova, foi avaliada a RG ao tempo de 15, 30 e 45 minutos, utilizando-se, em cada momento, 8 animais em cada subgrupo. Foram utilizados os testes estatísticos não paramétricos de Kruskal- W allis, com níveis de significância de 10%. Em seguida, foram feitos os testes de comparações múltiplas, com níveis de significância de 1% e 2%, respectivamente. Os resultados do estudo mostram que são significativas as diferenças entre as RG das soluções de L e M, SeM, S e SM, L e LM, L e SM. A maltose, associada à lactose ou à sacarose, promoveu retenção gástrica significativamente maior que a de solução de lactose ou sacarose isoladas, mantendo-se a densidade energética / Abstract: This study has the goals of establishing the gastric retentions of aqueous solutions of lactose, sucrose and maltose, all of them at 10% (w/v), and also the influence of associations between two of these sugars on the gastric retentions. Later on, it was studied this influence on gastric retention using sucrose or maltose on whole cow's milk. It was used 120 Wistar male rats, aged from 8 to 10 weeks. The rats received a test meal (2 rnl/l00g weight) with a marker by orogastric route through a metal tube. The markers used were phenol red (6 mg/dl) in the sugars aqueous solutions and polyethylene glycol (PEG) 4000 (2 g/dl) in the cow's milk test meal. The gastric retention was measured by determining the amount ofthe marker staying in the stomach by spectrophotometry. During the first phase of the study, 48 rats were distributed in 6 subgroups, each of them received test meal of aqueous solution of lactose 10% (L), sucrose 10% (S), maltose 10% (M), lactose 5% + sucrose 5% (LS), lactose 5% + maltose 5% (LM) and sucrose 5% + maltose 5% (SM) (w/v). The gastric retentions were determined 15 minutes after the infusion of test meal. In the second phase it was used 72 rats which were equaly distributed in 3 subgroups, according to the test meal: whole cow's milk without sugar addition, cow's milk plus suciose 5% (w/v) and cow's milk plus maltose 5% (w/v). The determinations of gastric retentions were performed at 15, 30 and 45 minutes after the orogastric infusion, being 8 animals used for each time and each test meal. In both phases of the study it was utilized the Kruskal- Wallis test, being a. = 10%. Later, the multiple comparisions were calculated with a. = 1 % and 2%, respectively, to first and second phases. There are significant differences between gastric retention of aqueous solutions of lactose and maltose (L x M), sucrose and maltose (S x M), sucrose and sucrose + maltose (S x SM), lactose and lactose + maltose (L x LM), lactose and sucrose + maltose (L x SM). The gastric retention of maltose plus lactose or maltose plus sucrose was significantly larger than those oflactose or sucrose at the same energetic density / Doutorado / Doutor em Saude da Criança e do Adolescente

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