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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

Efeito do estado nutricional bioqu?mico de retinol e alfatocoferol sobre seus n?veis em lactantes

Lira, Larissa Queiroz de 01 April 2011 (has links)
Made available in DSpace on 2014-12-17T14:03:37Z (GMT). No. of bitstreams: 1 LarissaQL_DISSERT.pdf: 2541848 bytes, checksum: 732cfe4b835f5fc4a48b57022760627a (MD5) Previous issue date: 2011-04-01 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / Vitamins A and E are essential nutrients in many biological processes, so that their adequate supply to the neonate is crucial. However, the bioavailability of vitamins may be limited by factors such as maternal nutritional status and the interaction between nutrients. This study aimed to investigate the effect of biochemical nutritional status of retinol and alpha-tocopherol levels in serum and colostrum. The study included 103 healthy puerperal women treated at the reference state maternity hospital (Natal-RN). Colostrum and serum samples were collected fasting in the immediate postpartum period and the analysis of retinol and alpha-tocopherol were determined by high-performance liquid chromatography. Specific cutoff points were adopted to characterize the biochemical status of vitamins A and E. For the total group of lactanting women the average concentration of retinol in serum (1.49 ? 0.4 &#956;mol/L-1) and colostrum (2.18 ? 0.8 &#956;mol/L-1), as well as alpha-tocopherol in serum (26.4 ? 8.0 &#956;mol/L-1) and colostrum (26.1 ? 12.8 &#956;mol/L-1), indicated adequate biochemical state. However, when evaluating the individual, was found a high prevalence of deficient serum (15%) and colostrum retinol (50%), and also alphatocopherol in serum (16%) and colostrum (61%). In women with serum retinol &#8805; 1.05 &#956;mol/L-1, found an inverse correlation between serum retinol and alpha-tocopherol in colostrum (p = 0.008, r = -0.28). This association was not observed in women with serum retinol <1.05 &#956;mol/L-1. This situation demonstrates for the first time in humans that high physiological levels of serum retinol, without supplementation, can negatively influence the transfer of alpha-tocopherol in breast milk. Although the diagnosis of satisfactory nutritional status lactanting women showed high risk of subclinical deficiency of vitamins A and E from measurements made in the colostrum / As vitaminas A e E s?o nutrientes essenciais em muitos processos biol?gicos, de modo que seu adequado fornecimento ao neonato ? fundamental. No entanto, a biodisponibilidade dessas vitaminas pode ser limitada por fatores como o estado nutricional materno e a intera??o entre nutrientes. Este trabalho teve como objetivo investigar o efeito do estado nutricional bioqu?mico de retinol e de alfa-tocoferol sobre seus n?veis no soro e no colostro materno. Participaram do estudo 103 pu?rperas saud?veis atendidas em maternidade p?blica de refer?ncia estadual (Natal-RN). Amostras de soro e colostro foram coletadas em jejum no p?s-parto imediato e as an?lises de retinol e alfa-tocoferol foram feitas por cromatografia l?quida de alta efici?ncia. Os valores de 1,05 &#956;mol/L-1 de retinol no soro e de 2,09 &#956;mol/L-1 de retinol no colostro foram adotados como pontos de cortes para caracterizar a condi??o bioqu?mica referente ? vitamina A. Valores de 11,6 &#956;mol/L-1 de alfa-tocoferol no soro e de 26,1 &#956;mol/L-1 de alfa-tocoferol no colostro foram adotados como pontos de cortes para caracterizar a condi??o bioqu?mica referente ? vitamina E. No grupo total de lactantes, a concentra??o m?dia de retinol no soro (1,49 ? 0,4 &#956;mol/L-1) e no colostro (2,18 ? 0,8 &#956;mol/L-1), assim como, de alfatocoferol no soro (26,4 ? 8,0 &#956;mol/L-1) e no colostro (26,1 ? 12,8 &#956;mol/L-1) indicou adequado estado bioqu?mico. No entanto, ao se avaliar o indiv?duo, foi constatada elevada preval?ncia de defici?ncia de retinol no soro (15%) e no colostro (50%), como tamb?m, de alfa-tocoferol no soro (16%) e no colostro (61%). Em mulheres com retinol s?rico &#8805; 1,05 &#956;mol/L-1, foi encontrado correla??o inversa entre retinol s?rico e alfa-tocoferol do colostro (p = 0.008, r = -0.28). Esta associa??o n?o foi observada em mulheres com retinol s?rico < 1,05 &#956;mol/L-1. Tal situa??o evidencia pela primeira vez em humanos, que n?veis fisiol?gicos adequados de retinol s?rico podem influenciar negativamente a passagem de alfa-tocoferol para o leite materno. Apesar do diagn?stico de satisfat?rio estado nutricional do grupo total de lactantes, ao se avaliar o indiv?duo, foi constatado elevado risco de defici?ncia subcl?nica para as vitaminas A e E a partir das dosagens feitas no colostro
2

Influ?ncia da suplementa??o de retinol palmitato sobre os n?veis de vitamina A no leite de pu?rperas saud?veis

Louren?o, Raquel Maria da Silva 19 May 2006 (has links)
Made available in DSpace on 2014-12-17T14:03:45Z (GMT). No. of bitstreams: 1 RaquelMSL.pdf: 657503 bytes, checksum: b03819bd313909e18887cde152d23958 (MD5) Previous issue date: 2006-05-19 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The tendency towards reduction of serum retinol levels, an existing placental barrier and the increase of retinol demand, are factors that place puerperal and lactating women at risk for Vitamin A deficiency. This micronutrient is an essential component of vital processes such as differentiation, cellular proliferation, and apoptosis. The objective of this study is to evaluate the effect of palmitate retinol supplementation (100.000UI) upon the milk retinollevels in puerperal women at the Janu?rio Cicco University Maternity Hospital. This intervention has been adopted by the Ministry of Health since 2002. The longitudinal experiment was conducted with 106 puerperal women (68 comprised the supplemented group and 38 the control group). The High Performance Liquid Chromatography (HPLC) method was used to dose the retinol of the milk and serum samples, and the creamtocrit method to determine the milk fat levels. The retinol means for the colostrums were 99.0 ? 64.4 ug/dL and 160.1 ? 94,4 ug/dl 6 hours afier supplementation; 68.9 ? 33.5 ug/dL for the transitional milk, and 30.6 ? 15.2 ug/dL for the mature milk of the supplemented group. Ali the difterences between means were statistically significant. The difterence between retinol means in the control group were also significant, with these being greater in the colostrum, 88.6 ? 62.1 ug/dL with 61.9 ? 30.1 ug/dl in the transition milk and 32.9 ?32.9 ? 17.6 ug/dL in the mature milk. No significant difference was observed in the retinol means of the three types ot milk in the supplemented group when compared to their respective means in the control group. The prevalence in serum (35.1 % and 81.1 % for the cutting point 20 ug/dL, respectively) and in milk (51.4%) revealed vitamin A deficiency as a public health problem. COlostrum, transition, and mature milk tats varied similarly in the supplemented group (1,92 ? 0,96; 3,25 ? 1,27 and 3,31 ? 1,36 grams) and in the control group (1,87 ? 1,14; 3,25 ? 1,31 and 3,36 ? 1,67 grams), with an observed difference between the colostrum/transition milk and the colostrum/mature milk fats. No difference was observed between the groups. The study showed that the 200.000UI supplementation was not sufficient to increase the milk retinol to the desired levels nor to meet the demands of the mothers with deprived hepatic reserves. It is suggested that another similar dose be offered within 30 days or less, and within 2 months post-partum, while continual/y monitoring for possible pregnancy / Fatores como a tend?ncia ? diminui??o dos n?veis de retinol s?rico das gestantes, barreira placent?ria e aumento da demanda de retinol, fazem com que pu?rperas e lactentes representem grupos de risco de defici?ncia em vitamina A, nutriente que participa de processos vitais, como a diferencia??o, prolifera??o celular e apoptose. O objetivo do presente trabalho foi avaliar o efeito da suplementa??o de retinol palmitato (200.000 UI) sobre os n?veis de retinol no leite de pu?rperas da Maternidade Escola Janu?rio Cicco (MEJC), interven??o que vem sendo adotada pelo Minist?rio da Sa?de desde 2002. O experimento do tipo longitudinal teve como participantes 106 pu?rperas (68 do grupo suplementado e 38 do grupo controle). A Cromatografia L?quida de Alta Efici?ncia (CLAE) foi o m?todo utilizado para dosar retinol das amostras de leite e soro; e o cremat?crito para determinar os n?veis de gordura no leite. A quantifica??o do retinol apresentou m?dias de 99,0 ? 64,4 ug/dl para o colostro; 160,1 ? 94,4 ug/dl para o colostro 6 horas ap?s suplementa??o; 68,9 ? 33,S ug/dl para o leite de transi??o e 30,6 ?15,2 ug/dl para o leite maduro do grupo suplementado. As diferen?as foram significativas entre todas as m?dias. O grupo controle tamb?m demonstrou m?dias de retinol significativamente diferentes, sendo estas superiores no colostro 88,6 ? 62,1 ug/dl, reduzindo para 61,9 ? 30,1 ug/dl no leite de transi??o e 32,9 ? 17,6 ug/dl no leite maduro. Nenhuma diferen?a significativa foi observada quando as m?dias do retinol referentes aos tr?s tipos de leite do grupo suplementado foram comparadas com as respectivas m?dias do grupo controle. A preval?ncia encontrada no soro (35,1% e 81,1 % para o ponto de corte 20 ug/dl e 30 ug/dl, respectivamente) e no leite (51,4%) revelou a defici?ncia de vitamina A como problema de sa?de p?blica. A gordura do leite colostro, transi??o e maduro variou de forma semelhante no grupo suplementado (1,92 ? 0,96; 3,25 ?1,27 e 3,31 ? 1,36 gramas) e controle (1,87 ? 1,14; 3,25 ? 1,31 e 3,36 ? 1,67 gramas), ocorrendo diferen?a entre colostroltransi??o e colostro/maduro. N?o houve diferen?a entre os grupos. O seguinte trabalho demonstrou que a suplementa??o utilizando 200.000 UI n?o foi capaz de elevar os n?veis de retinol no leite at? o momento esperado e, provavelmente, n?o foi fornecida em quantidade suficiente para satisfazer as demandas das m?es com reservas hep?ticas mais espoliadas. ? vi?vel sugerir que uma outra dose de igual valor seja ofertada, num intervalo de 30 dias a 60 dias p?s-parto, verificando sempre a possibilidade de gravidez

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