Abstract
The effects of caseins on the rheological properties of κ-carrageenan-calcium gel was investigated by measuring the gel breaking strength. The existence of β-casein in the system promoted the gelation of κ-carrageenan in the presence of calcium ion. Beta-casein increased the strength of calcium gels of κ-carrageenan with increasing NaCl concentration up to 80 mM and strengthened the κ-carrageenan-calcium gel at neutral pH. The values obtained from the slopes of the logarithmic plots of the gel strength versus concentration were 2.15 for κ-carrageenan gel and 2.27 for a β-casein-κcarrageenan mixture gel, suggesting that β-casein may participate in the gelation of κ-carrageenan through the mediation of calcium ions.
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