Kefir culture includes lactic acid bacteria, which depend strongly on exogenous nitrogen sources
The increased protein content may be indicative of the liberation of peptides from soymilk proteins due tothe action of secreted non-specific proteinases duringbioprocessing
Mobilization of soymilk proteins and dye-reactive peptides by growth of the Kefir cultures and prolonged proteinase activity may account for the subsequent decrease in protein content in latter stages of thebioprocessing period.