Avaliação de características nutricionais da mandioca e de seus híbridos interespecíficos

AUTOR(ES)

Pollyanna Teresa Cirilo Gomes

DATA DE PUBLICAÇÃO

2010

RESUMO

Cassava (Manihot esculenta Crantz) is one of the most important staple crops of the tropics and subtropics, feeding more than 800 million of people around the world. The roots of the common cultivars are extremely rich in starch, but are poor in other nutrients, such as protein, amino acids and micronutrients. It is reported that the contents of these nutrients are variable across Manihot wild species. It were studied 19 hybrids of M. esculenta and its wild relative M. oligantha about their root contents of crude protein, amino acid profile, levels of the micronutrients calcium, iron, zinc and magnesium besides its cyanogenic content. Some hybrids shown high contents of protein, reaching to 5,7% of dry mass, while the common cultivar studied had just 2,3% of crude protein. We have noted the presence of considerable amounts of the essential amino acids alanine, fenilalanine and valine in some of them, comparatively to the common cultivar of cassava. The sulphur-containing amino acids cysteine and methionine were detected in high proportions in the roots of 4 plants studied. Cystein and methionine are fundamental for endogenous detoxification of the toxic compound cyanide, which can be released from foods derivated of cassava. The proportion of lysine showed for the tubercles of one of the hybrids was twentyfold higher them the common cultivar. Lysine is one of the limiting amino acids of the biological value of the cassava protein. The most of the interspecific hybrids showed moderated cyanogenic content. Certain hybrids exhibited expressive gains of micronutrients contents relatively to the common cassava. These founds may represent an important advance in the nutritional improvement of cassava.

ASSUNTO(S)

proteína aminoácidos micronutrientes interspecific hybrids mandioca protein híbridos interespecíficos micronutrients. nutricao cassava amino acids

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