| WC | Water content |
| IC | Impurities |
| AC | Ash |
| A | Acidity |
| RS | Reducing sugars |
| TPC | Phenolic compounds |
| PCA | Principal component analysis |
| Cu | Copper |
| Ni | Nickel |
| Cr | Chromium |
| Pb | Lead |
| Fe | Iron |
| Zn | Zinc |
| Mn | Manganese |
| Ca | Calcium |
| Mg | Magnesium |
| K | Potassium |
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