Table 5
Organic acid contents of pretreated lotus leaves at different storage temperatures
| Pre-treatments | Storage temp. (℃) | Organic acids (mg/kg) |
| Oxalic acid | Citric acid | Tartaric acid | Malic acid | Succinic acid |
| Fresh | 25 | 128.8±24.61) | 135.2±22.8 | 14.2±8.5 | 40.4±12.8 | 221.1±20.5 |
| 4 | 117.9±33.3 | 107.4±2.6 | 10.5±5.6 | 29.6±1.9 | 218.1±27.8 |
| -10 | 107.8±6.0 | 144.2±44.2 | 22.2±19.2 | 44.5±12.7 | 220.0±9.5 |
| F-value | 0.563 | 1.333 | 0.68 | 1.627 | 0.017 |
| Blanched | 25 | 87.5±12.8a2) | 66.1±7.8 | 16.5±7.5a | 28.7±2.1 | 174.9±30.7 |
| 4 | 57.9±3.9b | 63.6±4.0 | 13.1±6.3a | 27.5±3.2 | 156.1±26.4 |
| -10 | 58.3±10.2b | 53.5±2.8 | 0±0b | 27.8±3.4 | 142.5±1.9 |
| F-value | 9.134*3) | 4.75 | 7.213* | 0.141 | 1.457 |
| Roasted | 25 | 150.5±26.3 | 104.1±20.4 | 13.0±5.5 | 40.5±5.4 | 256.4±60.9 |
| 4 | 151.7±30.9 | 129.4±20.9 | 8.8±1.1 | 38.6±5.6 | 293.2±40.9 |
| -10 | 147.3±11.2 | 107.0±17.4 | 7.6±0.2 | 36.8±4.9 | 305.6±2.6 |
| F-value | 0.026 | 1.485 | 2.361 | 0.358 | 1.093 |
| Dried | 25 | 388.5±23.6a | 182.0±35.2 | 36.6±16.9 | 69.1±16.5 | 863.5±50.9 |
| 4 | 385.4±26.4a | 193.5±67.4 | 48.7±26.6 | 75.4±23.5 | 888.8±131.5 |
| -10 | 0.7±0.3b | 239.5±43.9 | 64.3±35.2 | 85.4±9.0 | 908.3±97.4 |
| F-value | 357.759***4) | 1.079 | 0.781 | 0.67 | 0.155 |
Each value is mean±SD (n=3).
Means in a column by different superscripts are significantly different at p<0.05 significance level by Duncan's multiple range test.
significant at p<0.05.
significant at p<0.001.