Table 1.
Independent variables and their levels.
| Independent variables | Lower levels (−1) | Higher levels (+1) |
|---|---|---|
| a. Pectin concentration (% w/v) (X1) |
2 | 3 |
| b. Zinc acetate concentration (% w/v) (X2) |
1 | 2 |
| c. Pterostilbene:pectin ratio (X3) |
1:4 | 1:3 |
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