Composição mineral em genótipos de batata-doce de polpas coloridas e adequação de consumo para grupos de risco

Abstract The objective of this work was to quantify the minerals present in coloured pulp sweet potato genotypes, selected and cultivated by Embrapa (Empresa Brasileira de Pesquisa Agropecuaria), in the southern region of Rio Grande do Sul, Brazil, as well as checking their percentage adequacy for consumption by groups at nutritional risk. The following sweet potato genotypes grown in the Active Germplasm Bank were analysed in triplicate: white pulp (Rubissol, ILS 12, ILS 10 and ILS 24); cream pulp (Cuia, ILS 03 and ILS 44); yellow/orange pulp (Amelia and Beauregard); and purple pulp (ILS 56, ILS 16 and ILS 71). The minerals were quantified by atomic absorption spectrometry and expressed as mg of the corresponding mineral per 100 g -1 of fresh weight. The percentages of adequacy of the recommended daily intake of each genotype for risk groups (children between 4 and 8 years old and pregnant women between 19 and 30 years old) based on the consumption of an average portion of 200 g per day, were calculated. The sweet potatoes showed great variation in the minerals amongst the genotypes, and potassium was the most abundant in all of them, especially in the genotypes ILS 44, ILS 56 and ILS 71. The purple coloured genotypes stood out for their potassium contents and the cream coloured genotypes for their phosphorus contents. The consumption of a portion about 200 g of any sweet potatoes would provide 28% of the magnesium requirement for children, aged 4 to 8 years, and about 20% of the daily requirement of magnesium and 10% of potassium, for pregnant women.