title: Survival and stability of bifidobacteria loaded in alginate poly-l-lysine microparticles.
abstract: Bifidobacteria-loaded alginate microparticles were prepared by spraying a mixture of alginate and bifidobacteria culture using an air atomization method. Survival and stability of bifidobacteria loaded in microparticles were then evaluated. Survival of bifidobacteria from alginate poly-l-lysine microparticles was significantly increased when MRS broth or yeast extract was added in simulated intestinal fluid (pH 6.8). The number of bifidobacteria gradually increased for 8 h (10(8) cfu/g) and then reached about 10(9)-10(10) cfu/g when incubated over 12 h in intestinal fluid containing 0.5% yeast extract and 0.05% L-cysteine. The survival of bifidobacteria was highly dependent on the pH of the exposing media. When the bifidobacteria was immobilized with alginate or even poly-l-lysine treatment, the survival of bifidobacteria was highly enhanced in the low pH conditions (ca. > 10(8) vs. < 10(3) cfu/g). The stability of free flowing bifidobacteria-loaded alginate poly-l-lysine microparticles was significantly improved during storage at 4 degrees C in a refrigerator when compared to bifidobacteria cultures. The bifidobacteria-loaded alginate poly-l-lysine microparticles could be applied to various dairy products.
authors.affiliation: Department of Pharmaceutics, College of Pharmacy, Kangwon National University, College of Pharmacy, Kangwon National University, Chuncheon, South Korea.
authors.forename: J H
authors.initials: JH
authors.lastname: Cui
authors.forename: J S
authors.initials: JS
authors.lastname: Goh
authors.forename: P H
authors.initials: PH
authors.lastname: Kim
authors.forename: S H
authors.initials: SH
authors.lastname: Choi
authors.forename: B J
authors.initials: BJ
authors.lastname: Lee
mesh_terms: D000464:Alginates / Q000737:chemistry* / Q000494:pharmacology*; D001644:Bifidobacterium / Q000187:drug effects* / Q000254:growth & development; D003470:Culture Media; D005744:Gastric Acid / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008863:Microspheres; D011107:Polylysine / Q000737:chemistry* / Q000494:pharmacology*; D012995:Solubility
chemical_list: D000464:Alginates; D003470:Culture Media; D011107:Polylysine