Rheologica Acta, Vol.41, No.3, 276-284, 2002
Heat-induces gelation of globular proteins. Part 5. Creep behaviour of beta-lactoglobulin gels
Creep and recovery experiments have been used to investigate the behaviour of heat set protein gels exemplified by those prepared from beta-lactoglobulin (beta-Lg). Some initial experiment,, were also performed oil heat set BSA gels to establish appropriate experimental conditions. The latter illustrated the importance of a well-controlled thermal regime and the use of an appropriate solvent trap. Results from the concentration dependence of compliance for beta-Lg were in good agreement with previously published results for file long time extrapolated Storage Modulus. G(x)(1) we introduced previously, especially considering the necessarily different experimental conditions. The exponent of creep and recovery phase viscosity vs concentration was extremely high, similar to30 but reflects the nature Of Such gelling systems close to their critical concentration. In this respect, file behaviour of the creep phase viscosity as in qualitative,agreement with our recently postulated viscosity vs concentration state diagram for a gelling system.