Table 1 Standard grade and scores for bitterness taste.

From: Key bitterness compounds of cigar tobacco leaves and their molecular docking with human bitter receptors

Grade

Taste standard and description

Concentration of quinine hydrochloride (µg/mL)

Bitterness taste score

1

Almost no bitterness

10

0 ~ 2

2

Slight bitterness, just noticeable

20

2 ~ 4

3

Obvious bitterness, clearly identifiable

40

4 ~ 6

4

Strong bitterness, strong but acceptable

60

6 ~ 8

5

Intense bitterness, unbearable

100

8 ~ 10

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