Edible oil and protein concentrate fromLupinus mutabilis |
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| Authors: | Thomas Hatzold Ibrahim Elmadfa Rainer Gross |
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| Institution: | 1. Institut für Ern?hrungswissenschaft der Universit?t Giessen, Wilhelmstrasse 20, D-6300, Giessen, FRG
2. Instituto de Nutrición, Tizon y bueno 276, Lima 11, Peru
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| Abstract: | The seeds ofLupinus mutabilis show on average a protein content of 42.6% and a fat content of 18.7%. Unfortunately they contain up to 4.5% of bitter alkaloids which must be removed before consumption. Edible oil and protein concentrate were produced from the seeds at an industrial level. The oil is of good quality and is recommended for human nutrition. The main fatty acid is oleic while the main tocopherol is γ-tocopherol. During the refining process, which includes a washing process with aqueous acids for debittering, the alkaloid content of the oil is reduced to 5 ppm. During the extraction of the oil the alkaloids are concentrated in the oil cake, from which they can be removed by washing with an ethanol-water mixture. A protein concentrate containing 72.3% protein and 0.06% residual alkaloids is obtained. The analysis of alkaloid pattern by gas-chromatography showed that the alkaloid composition of the crude oil differs totally from that of the seed. The relative percentage of the alkaloid esters and that of the Tetrahydrorhombifoline are very much higher in the oil than in the seed. During the debittering process of the oil cake the relative percentage of the hydroxylupanines increases. |
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