Table 3. Comparisons of iron, zinc, phytate, polyphenol and phytate-to-mineral composition of white and coloured landraces of cowpeas locally available in northern Ghana.
| Parameter | Colour of cowpea | P | |
| White | Coloured | ||
| Iron | 6.2±1.1 (7)1 | 6.4±0.8 (7) | 0.738 |
| Zinc | 3.6±0.4 (7) | 3.3±0.5 (7) | 0.398 |
| Phytate (PA) | 570±108 (7) | 752±215 (7) | 0.077 |
| Polyphenols | 403±59 (5) | 725±257 (6) | 0.023 |
| PA : Iron2 | 8.0±2.1 (6) | 10.1±3.0 (7) | 0.171 |
| PA : Zinc2 | 16.5±2.9 (6) | 22.3±5.4 (7) | 0.037 |
1
Values are mean ± SD (number of landraces).
2
Molar ratio.