The contributions of free hydrogen ions, undissociated hydrogen ions in protonated acid species, and
anionic acid species to sour taste were studied through sensory experiments. According to tasting results,
it can be inferred that the basic substance producing a sour taste is the hydrogen ion, including free
hydrogen ions and undissociated hydrogen ions. The intensity of a sour taste is determined by the total
concentration of free hydrogen ions and undissociated hydrogen ions. The anionic acid species (without
hydrogen ions) does not produce a sour taste but can intensify or weaken the intensity of a sour taste. It
seems that hydroxyl or conjugated groups in anionic acid species can intensify the sour taste produced by
hydrogen ions. The following strategy to reduce the sensory sourness is advanced: not only reduce free
hydrogen ions, namely elevate pH value, but also reduce the undissociated hydrogen ions contained in
protonated acid species.
The contributions of free hydrogen ions, undissociated hydrogen ions in protonated acid species, andanionic acid species to sour taste were studied through sensory experiments. According to tasting results,it can be inferred that the basic substance producing a sour taste is the hydrogen ion, including freehydrogen ions and undissociated hydrogen ions. The intensity of a sour taste is determined by the totalconcentration of free hydrogen ions and undissociated hydrogen ions. The anionic acid species (withouthydrogen ions) does not produce a sour taste but can intensify or weaken the intensity of a sour taste. Itseems that hydroxyl or conjugated groups in anionic acid species can intensify the sour taste produced byhydrogen ions. The following strategy to reduce the sensory sourness is advanced: not only reduce freehydrogen ions, namely elevate pH value, but also reduce the undissociated hydrogen ions contained inprotonated acid species.
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