Discussion
Which one of the following is NOT A CORRECT statement?
Answer: C
The incorrect statement is that saltiness is a taste that is mainly produced by chloride ions.
Salty taste is produced mainly by sodium ions (and to a lesser extent other alkali metal cations), which enter taste cells through epithelial sodium channels. The anion modifies the taste, which is why sodium chloride tastes saltier than sodium salts of larger anions, but chloride alone is not the stimulus.
The other statements are accepted: glutamate gives the savoury umami or 'meaty' taste of cheese and soy sauce; astringency is a drying sensation caused mainly by phenolic compounds such as tannins binding salivary proteins; and sourness comes from hydrogen ions sensed by acid-sensitive channels in taste cells.
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