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Tapping test on the three types of sweet potato starch and Amprotab.
| No. | Type of starch | Average tapping index (%) |
|---|---|---|
| 1. | Unmodified starch | 20.6 |
| 2. | Modified starch using pentanol-1 | 24.6 |
| 3. | Modified starch using glacial acetic acid | 28.0 |
| 4. | Amprotab | 15.4 |
