Interação de proteinas do soro de leite com polissacarideo : fracionamento e estudo das propriedades funcionais dos complexos. / Protein interaction of the milk serum with polissacarídeo : fracionamento and study of the functional properties of the complexes.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

In dairy industries the coacervation between whey with hydrocolloid might be utilized in the fractionation and recovery of the proteins and contribute to reduce in the ambient pollution. The aim of this work was to study whey protein interaction as a result of cheese type "Minas" manufacturing with anionic polysaccharyde carboxymetyl-cellulose (CMC) using the complex coacervation technique. The proteins were fractionated and three different complexes. The variables of the conditions optimization of selected fractionation and precipitation were taken out from hydrocolloid concentration and pH. The complexes were classified as: precipitated 1: b-lg/CMC, precipitated 2: a-la;CMC and total precipitated: whey total protein (PT/CMC) and the values of the pH were 4.0; 3.2; and 3.0, respectively. The obtained complexes were studied trough the percentage analyses of soluble proteins-CMC and native-PAGE. The results demonstrated that the complexes ones partially free as they move further from pH original values of attainment and complexes precipitation. DSC analyses could conclude that hydrocolloid presence increases protein stability of the thermal denaturation process. It was analyzed some technological functional properties such as solubility, gelling, viscosity, foam properties and emulsion stability in different samples. Extrinsic parameters analysis varied for pH, ionic force and sample concentration. The increase of NaCl (0.5M) influenced in a positive way the solubility protein. However, the solubility (%SP) was minimum compared to the corresponding complexes obtention of pH. G" values had been always superior to G" for gelling tests and one could conclude that all complexes formed a viscous solid (20% of concentration). In pH 6.0, solutions viscosity was higher for a-lactoalbumin/CMC and b- lactoglobulina/CMC samples. Related to foaming characteristics, the best foaming capacity occurred in a a-lactoalbumin/CMC with pH 2.0. Related to the interaction between pH parameters and NaCl concentration one could notice a significant increase to foam formation (%) with a-lactoalbumin/CMC and b-lactoglobulina/CMC complexes. The results of emulsions stability analyses demonstrated that pH 6.0 and 5mg/mL concentration had samples greater stability to creaming and coalescence, and PT/CMC presented the lowest formation and complexes precipitation in pH 3.0.

ASSUNTO(S)

polissacarideos soro do leite proteinas

ACESSO AO ARTIGO

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