title: Production and monomer composition of exopolysaccharides by yogurt starter cultures.
abstract: As components of starter cultures for Bulgarian yogurt, Streptococcus salivarius subsp. thermophilus and Lactobacillus delbrueckii subsp. bulgaricus revealed extensive exopolysaccharide (EPS) production activity when cultivated in whole cow's milk. The polymer-forming activity of thermophilic streptococci was lower (230-270 mg EPS/L) than that of the lactobacilli (400-540 mg EPS/L). Mixed cultures stimulated EPS production in yogurt manufacture, and a maximum concentration of 720-860 mg EPS/L was recorded after full coagulation of milk. The monomer structure of the exopolysaccharides formed by the yogurt starter cultures principally consists of galactose and glucose (1:1), with small amounts of xylose, arabinose, and/or mannose.
authors.affiliation: Laboratory of Applied Microbiology, Institute of Microbiology, Bulgarian Academy Sciences, Plovdiv.
authors.forename: G I
authors.initials: GI
authors.lastname: Frengova
authors.forename: E D
authors.initials: ED
authors.lastname: Simova
authors.forename: D M
authors.initials: DM
authors.lastname: Beshkova
authors.forename: Z I
authors.initials: ZI
authors.lastname: Simov
mesh_terms: D000818:Animals; D001089:Arabinose / Q000032:analysis; D003470:Culture Media; D005690:Galactose / Q000032:analysis; D005947:Glucose / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D007778:Lactobacillus / Q000254:growth & development / Q000378:metabolism*; D008358:Mannose / Q000032:analysis; D008892:Milk / Q000382:microbiology*; D011135:Polysaccharides, Bacterial / Q000096:biosynthesis* / Q000737:chemistry*; D013291:Streptococcus / Q000254:growth & development / Q000378:metabolism*; D013696:Temperature; D014994:Xylose / Q000032:analysis; D015014:Yogurt / Q000382:microbiology*
chemical_list: D003470:Culture Media; D011135:Polysaccharides, Bacterial; D014994:Xylose; D001089:Arabinose; D005947:Glucose; D008358:Mannose; D005690:Galactose