Made available in DSpace on 2014-12-17T14:03:32Z (GMT). No. of bitstreams: 1 LahyanaRFC.pdf: 2685463 bytes, checksum: 7db6843f1628ffaeb8a563aad621ade6 (MD5) Previous issue date: 2010-02-24 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Vitamin A is important in many essential body processes and its deficiency results in serious consequences for human health. Breast milk is the only source of this vitamin for children that are exclusively breastfed. Analysis of vitamin A in mother s milk is important because its concentration is related to maternal vitamin A status and to its ingestion by the mother during pregnancy. The aim of the present study was to assess the effect of maternal supplementation with retynil palmitate on the concentration of colostrum retinol under fasting and postprandial conditions. A total of 149 nursing mothers were recruited at the Janu?rio Cicco Maternity School (Natal, Brazil) and allocated to two groups: Comparison (n = 69) and Test (n = 80). Blood and colostrum (in fasting and postprandial conditions) samples were collected up to 24hs after delivery. Serum retinol and colostrum levels were analyzed by high-performance liquid chromatography. The serum retinol level of 41.6 ? 12.7?g/dL (mean ? standard deviation) indicates adequate biochemical nutritional status. Colostrum retinol level was not influenced by serum retinol levels under any of the conditions established. In the colostrum, the retinol concentration in the unsupplemented test group was 67.3 ? 37.7 ?g/dL under fasting and 80.3 ? 35.1 ?g/dL under postprandial conditions (p<0.05), showing an increase of 19.3%. In the supplemented test group the values were 102.6 ? 57.3 ?g/dL and 133.4 ? 78.3 ?g/dL under fasting and postprandial, respectively (p<0.05), representing an increase of 30%. Considering that under fasting conditions most of the vitamin A transported to the milk originates in the retinol binding protein (RBP), the postprandial increase in colostrum retinol suggests a different transport mechanism of retinol to maternal milk from that performed by RBP. This situation becomes more evident under supplementation conditions. / Vitamina A ? importante em muitos processos essenciais no corpo e sua defici?ncia resulta em severas conseq??ncias para a sa?de dos seres humanos. O leite humano ? a ?nica fonte dessa vitamina para crian?as que s?o amamentadas de forma exclusiva. A an?lise da vitamina A no leite materno ? importante, porque a sua concentra??o neste fluido est? relacionada com o estado de vitamina A materno e com a ingest?o desta vitamina pela m?e durante a lacta??o. Assim, o objetivo do presente trabalho foi avaliar o efeito da suplementa??o materna com palmitato de retinila sobre a concentra??o de retinol no colostro em condi??es de jejum e p?s-prandial. Para isso, foram recrutadas 149 nutrizes saud?veis da Maternidade Escola Janu?rio Cicco (Natal- RN), sendo os grupos Compara??o 69 e Teste 80. Amostras de sangue, colostro em jejum e colostro p?s-prandial foram coletadas at? 24hs ap?s suplementa??o. As concentra??es de retinol no soro e colostro foram analisadas por cromatografia l?quida de alta efici?ncia. A concentra??o s?rica de retinol de 41,6 ? 12,7?g/dL (m?dia ? desvio-padr?o) indica estado nutricional bioqu?mico adequado. A concentra??o de retinol no colostro n?o foi influenciada pelos n?veis s?ricos de retinol, em nenhuma das condi??es estabelecidas. No colostro, a concentra??o do retinol no grupo teste sem suplementa??o foi de 67,3 ? 37,7 ?g/dL no jejum e de 80,3 ? 35,1 ?g/dL no p?sprandial (p<0,05), evidenciando um aumento de 19,3%. No grupo teste suplementado os valores foram de 102,6 ? 57,3 ?g/dL e 133,4 ? 78,3 ?g/dL no jejum e p?s-prandial, respectivamente (p<0,05), representando um aumento de 30%. Considerando que no jejum a maior parte da vitamina A transportada ao leite tem sua origem atrav?s da prote?na transportadora de retinol (RBP), o aumento no retinol do colostro p?s-prandial sugere um mecanismo de transporte do retinol para o leite materno distinto daquele realizado pela RBP. Tal situa??o fica mais evidente em condi??es de suplementa??o.