Selective hydrogenation of oo-rapeseed oil with Cu/Cr catalyst.Part 3.The effect of phospholipids, sulphur compounds and chlorophyll pigments on hydrogenation

Selection of L. bulgaricus and S. thermophilus strains for yogurt starters was based on the growth, acidifying activity, sensory properties of acidified milk and antagonistic activity against E. coli and S. aureus. All strains investigated exhibited good growth, acidifying activity and organoleptic properties. However, they varied much regarding antibacterial activity. Most of L. bulgaricus strains were bactericidic against E. coli and S. aureus while the others only slightly inhibited their growth. S. thermophilus strains inhibited the growth of staphylococci reducing totally or partially their population, while they showed only very weak antagonism against E. coli. Twenty four L. bulgaricus strains with bactericidic properties against E. coli and S. aureus and fourteen S. thermophilus strains bactericidic against S. aureus were selected for yogurt starters.