Isolation and in vitro hydrolysis of lentil protein fractions by trypsin / Aislamiento e hidrólisis \"in vitro\" de las fracciones proteínicas de la lenteja por la tripsina

ABSTRACT

The albumin and globulin fractions from lentil seeds were isolated and characterised by gel filtration. The latter was shown to be homogeneous and the formet heterogeneous on PAGE, the aminoacid analysis revealed high values of amidic amino acids for both fractions with great differences in the sulphur-containing amino acids. Native albumin, globulin and salt-soluble proteins were markedly resistant to trypsin hydrolysis compared to casein. The SDS-PAGE of native salt-soluble proteins indicated that the globulin fragments (20 to 30kD) were slowly digested in the presence of albumin. The heating increased the hydrolysis of the proteins in the order salt-soluble, albumin and globulin. The facilitated hydrolysis of the heated salt-soluble fraction seemed to be protein-protein interactions induced by heat