TABLE 3.

Physicochemical indexes comparison of 4 grades of base SAB samples.

Item	aFirst grade	A	B	C	D
Total acid (of acetic acid count)/(g/L)	≥ 0.30	✓	✓	✓	✓
Total ester (of ethyl acetate count) /(g/L)	≥ 1.50	✓	✘	✘	✘
Ethyl hexanoate/(g/L)	0.60–2.50	✓	✓	✓	✘

^aFirst grade, the physicochemical standard of SAB with high alcohol content (41–68% ABV) following the national standard of GB/T 10781.1-2021.