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Ability of tannin fractions of nuts to chelate copper, iron and zinc ions.
| Nuts tannin fraction |
μmol metal ions chelated by 0.5 mg of tannin fraction |
||
|---|---|---|---|
| Fe(II)a | Cu(II)b | Zn(II)b | |
| Walnuts | 2.7 ± 0.08 | 25.0 ± 0.90 | 0.1 ± 0.01 |
| Hazelnuts | 1.8 ± 0.11 | 22.5 ± 1.03 | 1.5 ± 0.08 |
| Almonds | 3.2 ± 0.14 | 20.5 ± 0.89 | 11.4 ± 0.57 |
Mean ± standard deviation (n = 3).
Determined by ferrozine assay.
Determined by tetramethylmurexide assay.
