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Compositions of five basic tastes and astringency sample solutions.
| Taste | Composition | Concentration |
|---|---|---|
| Sourness | Tartaric acid | 3 mM |
| Sweetness | Sucrose | 1 M |
| Bitterness (+) | Quinine hydrochloride | 0.1 mM |
| Bitterness (−) | Iso-α acid | 0.01 vol% |
| Bitterness (non-charged) | Caffeine | 100 mM |
| Saltiness | Potassium chloride | 300 mM |
| Umami | Monosodium glutamate | 10 mM |
| Astringency | Tannic acid | 0.05 wt% |
