Abstract: The change regularity of electrical conductivity and dielectric constant and major aromatic components in different types of dilution water and low-alcohol liquor samples diluted from the original Fen-flavor liquor or high-alcohol Luzhou-flavor liquor during storage was determined. Besides, the colloidal structure of liquor and main factors affecting the colloidal stability were explored. The results showed that appropriate amounts of metal ions in dilution water could effectively increase the stability of liquor colloidal solution, decrease the dielectric constant, and inhibit the hydrolysis of esters, thus improving the stability of low-alcohol liquor. Moreover, 1-year-aged samples of the low-alcohol Fen-flavor liquor (38°) obtained using the dilution water in which metal ion concentrations were adjusted by adding carboxylates of beneficial trace elements and the carboxylic acids corresponding to the predominant esters in liquor showed a 31.0% increase in the total content of ethyl acetate and ethyl lactate compared with the control. The total content of ethyl caproate, ethyl acetate and ethyl lactate in 1-year-aged samples of 38° Luzhou-flavor liquor obtained using the same dilution water increased by 10.2% compared with the control.

Key words: colloidal solution, electrolyte, dilution water, low-alcohol liquor, stability