Molecular chaperones are compounds that help stabilize whey proteins and prevent them from unfolding, aggregating
and precipitating. Casein has the ability to bind with other proteins to make them more chemically and heat-stable and more resistant to aggregation; thus, casein acts as a molecular chaperone. Alpha-casein can interact with partially
unfolded proteins through hydrophobic surfaces, preventing the normal thiol-disulfide interchange with other whey
proteins and eventual aggregation. This casein protein also can solubilize hydrophobically aggregated proteins. And its
chaperone ability increases with decreasing temperature.23 Other researchers also have studied the ability of alpha-casein,
beta-casein and kapa-casein to be molecular chaperones.24
Beta-casein forms a complex with proteins through electrical charges. Complex formation can occur with soluble or
aggregated whey protein, and the resulting compound is smaller than a self-aggregated whey protein complex. Smaller
complexes were more soluble and heat tolerant to 145 C, resulting in solutions with improved clarity. The chaperone
effect of milk protein concentrate was evaluated in conjunction with whey protein solutions and found to be stable at
10 percent protein in a meal replacement beverage processed under retort heating conditions.25,
Molecular chaperones are compounds that help stabilize whey proteins and prevent them from unfolding, aggregatingand precipitating. Casein has the ability to bind with other proteins to make them more chemically and heat-stable and more resistant to aggregation; thus, casein acts as a molecular chaperone. Alpha-casein can interact with partiallyunfolded proteins through hydrophobic surfaces, preventing the normal thiol-disulfide interchange with other wheyproteins and eventual aggregation. This casein protein also can solubilize hydrophobically aggregated proteins. And itschaperone ability increases with decreasing temperature.23 Other researchers also have studied the ability of alpha-casein,beta-casein and kapa-casein to be molecular chaperones.24Beta-casein forms a complex with proteins through electrical charges. Complex formation can occur with soluble oraggregated whey protein, and the resulting compound is smaller than a self-aggregated whey protein complex. Smallercomplexes were more soluble and heat tolerant to 145 C, resulting in solutions with improved clarity. The chaperoneeffect of milk protein concentrate was evaluated in conjunction with whey protein solutions and found to be stable at10 percent protein in a meal replacement beverage processed under retort heating conditions.25,
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