The quality characteristics of commercial alcoholic beverages (yakju, diluted soju, and fruit wines) were evaluated by assessing pH, total acidity, acetaldehyde, SO 2 , and flavonoid content. pH level was the highest in diluted soju, and total acidity and flavonoid content were higher in fruit wines compared to others. SO 2 was detected only in fruit wines, and the total SO 2 content was higher in the order of white wine [ red wine [ plum wine. Acetaldehyde contents were different according to the type of alcoholic beverage and analytic method of titration, enzymatic, headspace-GC and OIV methods. In fruit wines, acetaldehyde contents were significantly different according to analytic method (p \ 0.05), and acetaldehyde bound to SO 2 affected its quantification, resulting in lower acetaldehyde contents assessed by titration and headspace-GC than enzymatic and OIV methods. Therefore, selection of an appropriate analytic method is important for quantification of acetaldehyde in alcoholic beverages.