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GELATION OF MIXTURES OF SOYMILK AND RECONSTITUTED SKIM MILK SUBJECTED TO COMBINED ACID AND RENNET
Author(s) -
LIN CHUNGUO,
HILL ART,
CORREDIG MILENA
Publication year - 2012
Publication title -
journal of texture studies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.593
H-Index - 54
eISSN - 1745-4603
pISSN - 0022-4901
DOI - 10.1111/j.1745-4603.2012.00357.x
Subject(s) - rennet , isoelectric point , chemistry , skimmed milk , food science , chymosin , soy protein , chromatography , texture (cosmology) , network structure , casein , chemical engineering , organic chemistry , artificial intelligence , machine learning , computer science , engineering , image (mathematics) , enzyme
ABSTRACT The present work investigated the formation of a mixed gel containing soymilk and reconstituted milk. The mixtures contained 1.4 and 2% (w/v) milk and soymilk protein, respectively. When gelation was induced by addition of glucono‐delta‐lactone, the mixtures showed a gelation point well above the isoelectric point of the milk proteins, suggesting that soy proteins play a major role in the formation of the network. When rennet was added in combination with acidification, the gels showed an earlier onset of aggregation and a higher storage modulus than the gels prepared only with acid. Confocal microscopy showed networks with mixed acid–rennet gels having more branches and compact structures with denser clusters than acid‐induced gels. These results demonstrated that by fine‐tuning the gelation of mixed soymilk and reconstituted milk, it is possible to obtain gels with unique microstructure and texture, where both proteins are contributing to the network structure. PRACTICAL APPLICATIONS Mixed protein gels are increasingly employed to develop novel high‐protein products. This work illustrates the potential to employ a mixed gelation to induce the formation of protein matrices containing aggregates of soy and milk proteins. At the ratio used in this work (2% soy protein and 1.4% milk protein), soymilk proteins determined the gelation behavior of the mixtures. The gels showed an onset of gelation at pH around 6, and in the presence of rennet the skim milk proteins also participated in the network.