Influência da suplementação proteica sobre a concentração de proteína e imunoglobulina A do leite materno / Protein supplemantation effects on human milk protein and A immunoglobin concentrations

RESUMO

As amostras de leite de mulheres lactantes suplementadas com proteína de soro de leite bovino e com dieta alimentar adequada foram analisadas e comparadas com as de lactantes não suplementadas. A influência da suplementação proteica nas concentrações de proteína e de IgA foi avaliada em amostras de leite de 90 nutrizes, suplementadas com 14g de proteína durante o último trimestre de gestação e 20g nos primeiros três meses de lactação. A concentração de proteína do leite foi determinada após 30 (T30), 60 (T60) e 90(T90) dias de lactação. A de IgA, em 30 (T30) e 60 (T60) dias de lactação. A composição média de proteína no leite de mães suplementadas foi de 1,22 g/dL para T30; 1,16 g/dL para T60 e 1,07 g/dL para T90, e de0,94 g/dL para T30; 0,79 g/dL para T60 e 0,79 g/dL para T90 no grupo controle. A concentração de IgA foi de 109,1 mg/dL para T30; 94,4 mg/dL para T60 no grupo suplementado e no grupo controle de 72,8 mg/dL para T30 e 65,0 mg/dL para T60. Houve diferenças significativas nos valores de proteína e de IgA, em maiores concentrações, no leite das mães suplementadas, quando comparadas ao grupo controle.

ABSTRACT

Milk samples from healthy lactating women, who had been supplemented with bovine milk serum protein and receiving an adequate food regimens, were evaluated on protein composition and IgA concentration, and compared with those data from control group. The effect of protein supplementation on protein and IgA concentrations was investigated in milk samples from 90 nursing mother, who were supplemented with 14g of protein during the last trimester of pregnancy and with 20g at the first three months of lactation. The protein contents in mother milk were determined at 30 (T30), 60 (T60) and 90 (T90) days of post-lactation. IgA concentration was analyzed at 30 (T30) and 60 (T60) days of lactation. The average protein contents in milk samples from supplemented were 1,22 g/dL at T30; 1,16 g/dL at T60 and 1,07 g/dL at T90, and being 0,94 g/dL at T30; 0,79 g/dL at T60 and 0,79 g/dL at T90 in milk samples from control group. IgAconcentrations in milk from supplemented mothers were 109,1 mg/dL at T30; 94,4 mg/dL at T60, and in control group were 72,8 mg/dL at T30 and 65,0 mg/dL at T60. The overall results demonstrated a positive effect of proteins supplementation on human milk composition, when compared with the control group.