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Effects of paraquat on the quality of lipidic fraction of soybean

In order to determine the quality of lipidic fraction of soybean seeds from plants submitted to paraquat application, the composition and chemical indices of three crude extracts and one refined oil were studied. All samples were from Itumbiara-GO , Brazil. No residues of bipiridyls were detected, sensitivity less than 0.01µg/g. Fat acids profile, measured through palmitic, estearic, oleic, linoleic and linolenic acids were as espected for soybean oils, ranging from 9 to 14.5, 2.5 to 5.0, 18 to 34, 45 to 60 and 3.5 to 8,0%, respectively, although saponification indices have varied from 161 to 171, bellow the range of 189 to 198 for this oil. Free fat acids and unsaponifiable matter content of the crude oils and the iodine index of the refined oil attended the Brazilian standards which maximum values are 2.0%, 4.5% and 120 to 145, respectively. Iron and Cadmium contents were 1.45 and 0.39µg/g respectively meeting also the standards of quality. Lead was not detected, sensitivity less than 0.01 µg/g. Metal analyses were conducted by atomic absorption spectrophotometry.

Bybiridyls; soybeans; lipid fraction


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