Table 2. Free organic acid contents in plum juice and vinegar
| Free organic acid (mg/100 g) | Sample |
| Plum juice | Plum vinegar |
| Oxalic acid | 6,956.04±120.491)a2) | 2,101.12±0.54b |
| Citric acid | ND3) | ND |
| Malic acid | 105.90±0.24 | ND |
| Succinic acid | 292.32±1.10a | 248.86±0.45b |
| Formic acid | ND | ND |
| Acetic acid | ND | 3,189.13±0.91 |
| Total | 7,354.26±49.08a | 5,539.12±0.37b |
All values are mean±SD (n=3).
Means with different superscript letters (a,b) in the same row are significantly different at p<0.05 by Duncan’s multiple range test.
ND, not detected.