Notando (taste richness index)
濃淡度のうたんどNotando (taste richness index) is a numerical indicator of how rich or light a sake tastes. It is calculated from the glucose concentration (S) and acidity (A), and it can account for roughly 70% of the difference in richness or lightness of taste. The formula is as follows:
Z (notando) = 0.42S + 1.88A - 4.44
When the sake meter value (SMV) (N) is used instead of glucose concentration, the following formula is used:
Z = (9454 / 1443 + N) + 1.88A - 68.5
The notando value classifies the richness of a sake's taste as follows:
- Very light: Z = -3
- Fairly light: Z = -2
- Slightly light: Z = -1
- Neither: Z = 0
- Slightly rich: Z = 1
- Fairly rich: Z = 2
- Very rich: Z = 3
In this way, notando quantifies the sensory character of sake and serves as an important reference for consumers choosing a sake to suit their taste.