Efeito da extrusão termoplástica nas características físico-químicas e nutricionais do rúmen bovino e sua aplicação na alimentação humana / Thermoplastic extrusion effects on physical-chemical and nutritional properties of bovine rumen and its application in human feed.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Introduction. Bovine rumen is a slaughterhouse by-product rejected by sensorial and cultural reasons. Nevertheless, it is a great proteic source and its utilization in human feed is necessary. Objective. Development of a product made with bovine rumen, analyzing its physical-chemical and nutritive characteristics and its use in human feed. Methodology. Bovine rumen was deffated and extruded in a single screw extruder. The Response Surface Methodology was applied to verify extrusion effects on functional properties of rumen: water holding capacity, emulsifying capacity, emulsion stability, protein solubility and surface hydrophobicity of protein. The nutritive composition of rumen (composition per 100g, cholesterol and fatty acid profile) was evaluated and also its proteic quality through its amino acid composition and in vivo true digestibility. Three meat products (sausage, chicken hamburger and quibe) were produced with extruded or flour rumen and compared with extruded of soy protein concentrated through sensory analysis. Results. After extrusion, emulsifying capacity, protein solubility and surface hydrophobicity of protein were improved, while water holding capacity and emulsion stability were reduced. Moisture had influence on water holding capacity. Extrusion of bovine rumen was fixed at 35% of moisture (dry basis) and 150oC of processing temperature. The evaluation of composition per 100g showed that bovine rumen is a great proteic source. After deffating, cholesterol was reduced and saturated fatty acids were totally removed. Amino acid scores corrected by true protein digestibility were 1 or 100% before and after extrusion. Sensory analysis showed that extruded bovine rumen should be added at sausage instead of flour rumen, but both extruded or flour rumen can be added at chicken hamburger and at quibe with equal sensory acceptance. Conclusion. Extrusion is a way of bovine rumen utilization, but it is not essential for its use in food, since it was not necessary in some cases. Nevertheless, extrusion changed functional properties of rumen, favoring its application in some sausage products and improving its sensory acceptance. Nutritive quality of protein, both raw and extruded rumen, was high and it was not affected by extrusion.

ASSUNTO(S)

bovine rumen functional properties rúmen bovino protein proteína propriedades funcionais thermoplastic extrusion análise sensorial extrusão termoplástica sensorial evaluation

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