Mineral composition and distribution in lupin seeds and in flour, spray dried powder and protein isolate produced from the seeds

Abstract

AbstractThe mineral composition and the distribution of mineral elements between the seed hull and endosperm was examined for 33 samples from two species of lupin seeds (Lupinus albus and L angustifolius) grown under field conditions in Victoria, Australia. With the exception of calcium and aluminium in both species and boron in L albus, minerals were present at a much higher concentration in the endosperm than in the hull. High concentrations of nitrogen and sulphur in the endosperm of both species reflect the fact that lopin seed protein and sulphur‐containing amino acids were stored mainly in the endosperm. All elements studied except sulphur, phosphorus and iron were present at much lower concentrations in lupin protein isolate than in spray dried lupin extract.The mineral composition of lupin protein isolate prepared from both species can be compared favourably with that of soya bean protein isolate. The results of this study indicate a potential for replacing soya protein isolate with lupin protein isolate.