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“Juglone was found predominant in green husk (average value of cultivars is about 31.308 mg/100 g). Significant differences in contents of identified juglone were observed among cultivars that ranged from 20.56 to 42.78 mg/100g for green husk, and 5.42 to 22.82 mg/100 g for leaves.”
juglone→is found→in green husk and leaves of walnut cultivars
African walnut (Tetracarpidium conophorum)→ is below →WHO permissible limits for heavy metals
Cd: not detectedCr: 0.001ppmFe: 0.064ppmHg: not detectedMn: 0.012ppmNi: 0.005ppmPb: not detected
“The heavy metal concentrations in the fruit is Fe (0.064ppm), Mn (0.012ppm), Cr (0.001ppm), Ni (0.005ppm) while the concentrations of Hg, Pb and Cd were not detected. The results revealed that the T. conophorum is rich in ascorbic acid and carbohydrate with moderate valves of crude protein while the ash content was shown to be very low. This result shows that T. conophorum nut is not polluted with heavy metals since the concentrations of the heavy metals were all below WHO permissible limits.”