Abstract
This study aimed the to investigate presence of residual allergenic cow's milk proteins (CMP) in some milk substitutes employed in the treatment of cow's milk allergy (CMA). These allergens may interfere with the treatment, and elicit allergic reactions in sensitized individuals. The protein composition of the different extracts was evaluated by Lowry's method and tricine SDS-PAGE. Different immunoenzymatic methods were used (ELISA, EAST and immunoblotting) to quantify total serum IgE and specific serum IgE, as well as to detect the presence of antigenic and allergenic components. The results showed a higher protein content in mammalian milks (cow, sheep, mare, goat, and human) than in hydrolyzed substitutes (partially or extensively hydrolyzed casein or whey proteins). Residual native, processed, or contaminant polypeptides have been identified in the moderate hydrolysates, whereas extensive hydrolysates did not show the presence of residual components by immunoblotting. However, specific antibodies with capacity to bind to peptides have been detected by EAST and ELISA, suggesting that extensive hydrolysates contain residual peptides that preserve immunoreactive epitopes. We were unable to demonstrate either residual antigenic...Continue Reading
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