2.3. Sensory evaluation of the intensity of sour taste
A system of intensity scoring was used, with ten trained tasters
asked to assess the samples on a scale of sourness from 0 to 5,
where 0 = absent, 1 = slight, 2 = noticeable, 3 = obvious, 4 = strong
and 5 = extreme. The arithmetical mean values of the tasting panel
scores represented the extent of the sour taste.