46F-15 |
Protein quality of Lupinus campestris debittered seed trough aqueos, acid and alkaline thermal treatments |
C. JIMENEZ-MARTINEZ1, R. Mora-Escobedo1, F. G. Loarca-Piña2, and G. Davila-Ortiz1. (1) Departamento de Graduados e Investigacion en Alimentos, ENCB-IPN, Prolongación de Carpio y Plan de Ayala s/n, Col. Santo Tomas, D.F., 11340, Mexico, (2) PROPAC, UAQ, Carretera a Qro., Queretaro, 22340, Mexico There is an increasing importance being given to the Lupinus genus as a possible soybean substitute, in human food stuffs. Seeds of L. campestris have a similar chemical composition as soybean, containing 44% of protein and 13% of oil. Lupin protein is low in the sulphured containing amino acids, however, when these are suplemented with DL-methionine its biological value increase . The L. campestris seed is one of the 90 wild species growing in Mexico. The Lupinus seed utilization has been limited for some years owing to the presence of toxic quinolizidinic alkaloids (QAs) and antinutritional factors (ANFs). The objective of this work was to diminish or eliminate alkaloids and oligosaccharides trough the protein quality aqueous, acid and alkaline thermal treatments and determine the possible improvement in their protein quality . The obtained results showed that the most efficient treatment for QAs elimination was the alkaline one. The protein content increased in the both treatments from 44% to 50-53% and the oligosaccharides were completly eliminated. Although protein concentration was higher with all the applied treatments, their biological protein quality was poor. Supplementation with 0.3% of DL-methionine increased the biological protein quality (1.85)however was smaller than casein(2.34). The obtained PER value showed that aqueous thermal treatment (1.85)was the best one. Apparent Digestibility was more than 90% for both treatments, however alkaline treatment showed the best value(95%).
Session 46F, Nutrition
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