Organic acid content was important in vinegar drinks because it had influence on sourness and thereby had a major impact on overall quality (1).
As shown in Table 3,acetic acid was the most prevalent, and therefore the acetic
acid values can serve as a quality index of the vinegar drinks considered. Oxalic, citric, malic, succinic, and lactic acids were also present.
These results are in line with those of Jeong et al. (20).
Citric acid content, which is also influential on vinegar taste because of its sourness, was high in all samples except the OV.
Mulberry thus had the highest acetic acid content by ratio.
The reason for the high acetic acid ratio in the OV is most likely related to its
relatively low citric acid content, compared to that in other vinegar drinks.
Thus ratio of acetic acid to total acid is in inverse proportion to citric acid and sourness.