Health concerns related to the intake of salt have encouraged the investigation into sodium reduction by examining the taste-taste interaction between the perception of saltiness and umami. The effect of saltiness enhancement and sodium reduction of four kinds of umami carrier (WSA, MSG, IMP, and I + G) in a salt model solution with different salt concentrations (2.03-13.94 g/L) were investigated using the two-alternative forced-choice (2-AFC) and generalized Labeled Magnitude Scale (gLMS). The saltiness difference thresholds (DT) under different umami carrier were further explored using the constant stimuli method. The results showed that umami carriers had effective effects of saliness enhancement in the salt solutions with different concentrations, and higher enhancemen levels were obtained at larger salt concentrations. The level of saltiness enhancement were varied between the different umami intensity and carriers, and WSA carrier with moderate intensity had the maximum sodium reduction percentages which reached to 24.25%. Besides, the DT values of saltiness taste were increased under umami carrier, which means that more salt can be reduced without evoking a variation in saltiness. The present work not only provided insight into the effect of umami chemicals on the saltiness perception and saltiness DT values but also presented valuable information regarding flavor when developing low sodium foods and contributing to the development of more healthful products that meet current nutritional recommendations.
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