Some wild plants have a high nutritional value, a group of researchers from the Fat Institute (CSIC) and the University of Seville have confirmed. The scientists have found that several species of lupins from the mountains of Andalusia have a protein content similar to that of other cultivated legumes, as they publish in the online version of the Food Chemistry magazine.
Javier Vioque is a scientific researcher from the Fat Institute (CSIC) in Seville. "We have studied the seeds of six species of lupin (Lupinus sp.) in the south of Spain and we believe that they may represent new sources of quality proteins", he explained to SINC.
The cultivated lupin, a legume which is used as cattle fodder (although its grains are also edible if the bitterness is removed with water and salt), belongs to the Lupinus albus species, but the researchers have focused on six other species which grow wild in Andalusia or are cultivated in a marginal manner: Lupinus angustifolius, L. cosentinii, L. gredensis, L. hispanicus, L. luteus and L. micranthus.
Vioque and other colleagues from the Fat Institute and the University of Seville have analyzed the composition of the amino acids which make up the seed proteins, as well as the "protein digestibility" (percentage of protein digested) and other nutritional parameters. The results of the work will be published at the end of the year in the Food Chemistry magazine, although they can already be viewed online.
The data reflect that the species studied display a high protein content fluctuating between 23.8% and 33.6%, very similar to that observed in other legumes. Moreover, the protein digestibility of these lupins is high (between 82% and 89%) and is also similar to that of other legumes and cereals. The study concludes that L. luteus, L. hispanicus and L. cosentinii contain the proteins with the best nutritional properties and that the amino acid composition of the latter species is the most balanced.
Legumes as a source of proteins
Despite the above, the consumption of legumes has decreased in recent years, especially that of autochthonous and locally-distributed species. The legumes of the Lupinus species are no exception to the problem.