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Heat-induced gelation properties of chicken breast muscle salt soluble proteins when mixed with β-lactoglobulin or an α-lactalbumin enriched protein fraction


Heat-induced gelation properties of chicken breast muscle salt soluble proteins when mixed with β-lactoglobulin or an α-lactalbumin enriched protein fraction



Meat Science 48(1-2): 135-147



ISSN/ISBN: 0309-1740

PMID: 22062886

DOI: 10.1016/s0309-1740(97)00084-3

The heat-induced gelation properties of mixed protein systems containing chicken breast muscle salt-soluble proteins (SSP) and β-lactoglobulin (β-lg) or SSP and an α-lactalbumin-enriched fraction (α-la) in 0.6 M NaCl, pH 6.5, were investigated using dynamic rheology. At 70 °C, SSP had greater storage modulus (G') values than mixtures containing SSP/α-lg. However, at 90 °C, mixtures containing 80:20 and 60:40 SSP: β-lg had higher G' values than SSP alone, indicating that denaturation of β-lg directly or indirectly facilitates the formation of a more rigid gel structure. On subsequent cooling to 20 °C, the extent of structure formation, as reflected by G' values, was greater for SSP than for mixtures containing SSP/β-lg, which suggests that the denatured β-lg is unable to interact with the SSP during cooling. Mixtures containing SSP and an α-la-enriched fraction had lower G' values than SSP at 90 °C and on subsequent cooling to 20 °C, which reflects the poor gelling properties of α-la. A fibrous network was observed when the microstructure of the SSP and 40:60 SSP: α-la gels were examined using scanning electron microscopy, while aggregated networks were seen in the β-lg and 40:60 SSP: β-lg gels. No significant differences (p > 0.05) were observed between the water holding capacity (WHC) of SSP and SSP/β-lg gels. Gels formed from a mixture of SSP and the α-la-enriched fraction had lower WHC than the SSP gels. The myosin heavy chain was a major contributor to gel structure formation in all mixed gel systems.

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Accession: 053501073

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