FOOD. Science. Technology. Quality

Food. SCIENCE. Technology. Quality

Food. Science. TECHNOLOGY. Quality

Food. Science. Technology. QUALITY




Production of whey protein / polysaccharides mixed gels and investigation of their mechanical properties


The objective of this research was to investigate the effect of the gelling agents: arabic gum, carrageenan, guar gum, locust bean gum, and xanthan gum on the texture properties of ‘WPI’ gels using a ‘compression to failure’ test. The whey protein concentration in gels was 15%, and the concentration values of polysaccharides added, in relation to proteins, were respectively: 3, 5, 8, 10, 15, and 20%. The dispersed solutions (pH 7.0) were heated at 80oC during a period of 30 min. When xanthan gum and arabic gum were added, the compression stress value decreased when gels cracked. The addition of locust bean gum and carrageenan caused the increase of the gels hardness, whereas the cohesion of gels decreased as soon as polysaccharides were added except for the addition of the carrageenan. As for the higher concentration values of arabic gum and guar gum, it was stated that the initial cohesiveness of gels was restored; this phenomenon could be attributed to a specific role of the polysaccharides at a particular level of their concentration: they probably were a gluing factor of the structure of gels.


arabic gum, carrageenan, guar gum, locust bean gum, xanthan gum, whey