The gel strength and textural properties (hardness and springiness) of 1% mixed gum gels
(konjac flour:secondary gum = 3:2) prepared with and without added sodium chloride (NaCl)
and soy protein isolate (SPI) were investigated. A factorial design with three factors
including NaCl concentration (0, 0.5 and 1%), SPI concentration (0, 0.5 and 1%) and
secondary gums (κ-carrageenan, xanthan and gellan gum) was applied. The change of mixed
gels properties was mostly influenced by NaCl concentration. Increasing of NaCl resulted in
the increase in gel strength and hardness of konjac/κ-carrageenan and konjac/gellan mixed
gels but not in the konjac/xanthan mixed gel. The gel strength and hardness produced by
konjac/gellan gels were higher than the others. There was no significant difference (p > 0.05)
in springiness of konjac/xanthan mixed gel under added NaCl and SPI conditions, whereas
decreased springiness values were observed for konjac/κ-carrageenan or gellan mixed gels
with increasing of SPI addition.