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Sementes individuais de amendoim colhidas aos 108, 115 e 120 dias foram utilizadas para um estudo de adequação da análise do teor de óleo pelo método de ressonância magnética nuclear (RMN). Foram feitas análises de correlação e regressão deste com o método extrativo, Soxhlet, mostrando os dados uma correlação positiva (r = 0,98) entre ambos. Embora os valores obtidos pelo Soxhlet tenham sido ligeiramente maiores, é possível estimar, através de uma equação de regressão linear, os teores de óleo em Soxhlet a partir dos teores em RMN. Foram feitas, ainda, estimativas de variabilidade entre plantas e entre sementes dentro de plantas e do número de plantas e de sementes por planta necessário para estimar a média de teores de óleo com erro-padrão da média igual a 0,5, 1 e 2%. As estimativas de variabilidade entre sementes individuais sugerem a necessidade de usar amostras compostas de grupamentos de sementes para que as médias populacionais do teor de óleo estejam contidas em intervalos de até y ± 2%. Individual peanut seeds were studied concerning the feasibility of oil content evaluations by the Nuclear Magnetic Resonance method (NMR). Correlation and regression analyses with the extractive (Soxhlet) method were performed. A variance study among seeds per plant and seeds among plants was also made in order to access the possibility of selecting for oil content based on individual seed evaluations. The data showed a high and positive correlation (r = 0.98) between both methods. Although the values obtained by the Soxhlet method were slightly higher than those obtained by the NMR, the relationship between both methods was linear, indicating the possibility of correcting the data when necessary. The observed variances in oil content among seeds of the same plant were at least equal to those observed among plants. These values indicated that, for deviations in oil content of up to 2%, a number of seeds always higher than 1 is necessary for sampling

bragantia

Determinação do teor de óleo em sementes individuais de amendoim pelo método de ressonância magnética nuclear: estudo de variância e relação com o método Soxhlet