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This paper presents the results of the determination of Ca, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, and Zn in 30 samples of roasted cashew nuts from six towns in Southeastern Nigeria. The elements were determined by flame atomic absorption spectroscopy with background correction after ashing of the nuts at 450 °C and mineralizing with acids. The results (mg/kg; dry matter) showed that K (overall mean) occurred at 6200±130, Mg at 2900±110, Na at 2600±180, Ca at 360±40, Zn at 71±6, Fe at 69±6, Cu at 23±2, Mn at 21±2, Ni at 0.25±0.07 and Cr at 0.078±0.036. Consumption of cashew nuts in the two retail weights of approximately 35 and 79 g will provide (mg/day): 217–489 K, 102–229 Mg, 91–205 Na, 13–28 Ca, 2.5–5.6 Zn, 2.4–5.5 Fe, 0.8– 1.8 Cu and 0.7–1.7 Mn. Compared to the Reference Daily Intake, these values will amount (%) to 40-90 for Cu, 35-85 for Mn and 13-31 for Fe. PCA analysis revealed interrelationships among the metals and suggested that the metals were of natural sources. Roasted cashew nuts would therefore serve as a dietary source of essential elements and pose no toxicological health risks.

Mineral constituents of roasted cashew nuts (Anacardium occidentale L.) from Southeastern Nigeria