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The purpose of this paper is to determine the effect of the genotype on the mineral composition (Ca, Cu, Fe, Mg, Mn, Se, Zn and K) of peanuts.

Samples of peanut of three genotypes common names cultivar cavalo vermelho (CCV), cultivar cavalo rosa (CCR) and cultivar tatu (CTA) were used. They were grown in the Maringá, Paraná State region in the same period and were purchased directly from the producer. About 500 g of each genotype were purchased and divided into five equal parts. Each part was analyzed separately and in triplicate (n=15). Mineral analysis was performed in an atomic absorption spectrophotometer with flame ionization.

Among the analyzed minerals, K occurred in the greatest amount (−600 mg · 100 g⁻¹ of sample), followed by Mg (−250 mg · 100 g⁻¹ of sample), and calcium (−65 mg · 100 g⁻¹ of sample). These values were statistically equal for the investigated genotypes. The iron content varied significantly between samples (from 2.7 to 4.6 mg · 100 g⁻¹ of sample). Zinc content ranged between 6 and 10 mg · 100 g⁻¹ of sample. The contents of the other minerals (Cu, Mn, and Se) were lower than 4 mg · 100 g⁻¹ of sample for all genotypes. The quantities of Mn and Se ranged between 1.2 and 2.1 mg · 100 g⁻¹.

Have few studies of comparative variation in minerals contents in different genotypes of peanuts. In relation to the RDI, the paper observed that 100 g of peanuts can provide significant amounts of most minerals or even more than the RDI amounts, all genotypes being very nutritious.