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3.
Allergol. immunopatol ; 42(1): 29-34, ene.-feb. 2014. ilus, tab, graf
Artigo em Inglês | IBECS | ID: ibc-119050

RESUMO

BACKGROUND: The aim of this study was to assess the sensitivity profile of the population of Fez and Casablanca in Morocco to dry broad bean (Vicia faba), and to investigate the effect of food processing (heat and/or enzymatic hydrolysis by pepsin) on the human IgE binding capacity to broad bean proteins (BBP). METHODS: Sera samples from 146 patients with atopic hypersensitivity were recruited in order to evaluate specific IgE levels to native and processed broad bean proteins by ELISA. Under the same conditions, we assessed the immunoreactivity of rabbit IgG obtained by immunisation with native BBP. RESULTS: High IgE levels to BBP were found; in fact, 79.3% of children and 80.4% of adults had positive values. The heat treatment (70 °C during 60 min) of dry beans proteins showed slight reduction in recognition of these antigens by rabbit IgG (22%) and by human IgE (12%). Pepsin hydrolysis decreased rabbit-IgG recognition by 55% in the first 30 min of treatment. In contrast, and under the same conditions, pepsin increased human-IgE recognition with an average of 143% for all patients. However, the combination of the two treatments (heating and pepsin digestion) showed a decrease of 16% in BBP recognition for all patients. CONCLUSIONS: This study demonstrates a high sensitivity of a Moroccan population to broad bean proteins which was resistant to heat and digestion by pepsin


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Assuntos
Humanos , Hipersensibilidade Imediata/imunologia , Hipersensibilidade Alimentar/imunologia , Fabaceae/efeitos adversos , Marrocos , Proteína Hidrolisada Vegetal
4.
Rev. nutr ; 22(6): 879-885, nov.-dez. 2009. tab
Artigo em Inglês | LILACS | ID: lil-544480

RESUMO

OBJECTIVE: The objective of this study was to evaluate the biological properties of a protein hydrolysate obtained by enzymatic hydrolysis of mechanically deboned chicken meat. METHODS: Mechanically deboned chicken meat was hydrolysed using Alcalase 2.4 L FG and then dried in a spray-drier. Three groups (n=6) of male Wistar rats received diets containing casein, mechanically deboned chicken meat protein hydrolysate and a protein-free diet. The rats were randomly assigned to individual cages with controlled temperature (22ºC) for 12 days. RESULTS: The mechanically deboned chicken meat diet resulted in a good net protein utilization (3.74) and high true digestibility (96 percent). The amino acid composition of the hydrolysate was relatively well balanced, but the concentrations of methionine and cystine were low, making them the limiting amino acids. The proximate chemical composition of the hydrolysate showed protein content to be as high as 62 percent. CONCLUSION: The results obtained in this work suggest that mechanically deboned chicken meat hydrolysate can be used as a protein enhancer in food preparations such as enteral formulations, and as an edible protein enhancer in general applications.


OBJETIVO: O objetivo do estudo foi avaliar a qualidade biológica da proteína hidrolisada obtida a partir da carne mecanicamente separada de frango. MÉTODOS: A carne mecanicamente separada de frango foi hidrolisada com a enzima Alcalase 2,4 L FG e o hidrolisado obtido foi submetido a secagem em atomizador. Foram utilizados três grupos (n=6) de ratos machos Wistar os quais receberam dietas contendo caseína, proteína hidrolisada de carne mecanicamente separada de frango ou uma dieta com proteína livre. Os animais foram distribuídos aleatoriamente em gaiolas individuais, com temperatura controlada (22ºC), por um período de 12 dias. RESULTADOS: A dieta utilizando carne mecanicamente separada de frango resultou em elevada utilização líquida de proteína (3,74) e elevada digestibilidade verdadeira (96 por cento). A composição de aminoácidos da proteína hidrolisada apresentou bons resultados, embora metionina e cistina tenham apresentado baixos valores, sendo considerados aminoácidos limitantes. A composição química mostrou altos valores de proteína no hidrolisado obtido (62 por cento). CONCLUSÃO: Os resultados obtidos neste trabalho sugerem que a proteína hidrolisada de carne mecanicamente separada de frango poderá ser utilizada como um suplemento em formulações alimentares, tais como formulações enterais, ou como fonte de complementação protéica na indústria de alimentos em geral.


Assuntos
Animais , Masculino , Fatores Biológicos/análise , Proteína Hidrolisada Vegetal , Ratos Wistar
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