Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 2 de 2
Filtrar
Adicionar filtros








Intervalo de ano
1.
Braz. j. microbiol ; 42(4): 1470-1478, Oct.-Dec. 2011. graf, tab
Artigo em Inglês | LILACS | ID: lil-614612

RESUMO

To analyze the exopolysaccharide (EPS) production by Streptococcus thermophilus ST1, cultures were cultivated in 10 percent (w/v) reconstituted skim milk under different growth conditions including various temperatures and pHs of growth medium, supplementation of the medium with various carbon sources (glucose, lactose, sucrose, galactose and fructose) and nitrogen source (whey protein concentrate, or WPC). The results showed that most EPS production by strain ST1 was obtained at a temperature (42°C) and pH (6.5) optimal for its growth. Supplementation of the skim milk medium with either carbohydrates or WPC increased both growth and polymer formation by different extents, with sucrose being most effective among the carbon sources tested. Under the optimal cultural conditions, i.e. pH 6.5, 42°C with 2 percent (w/v) sucrose and 0.5 percent (w/v) WPC, 135.80 mg l-1 of EPS was produced by strain ST1. The monosaccharide composition of the EPS was determined to be glucose and galactose (2:1), and the molecular mass of the EPS was 3.97 × 10(6) Da. The aqueous solution of the EPS at 1 percent (w/v) showed relatively high viscosity, indicating the potential of this EPS-producing S. thermophilus strain for applications in the improvement of physical properties of fermented milk products.


Assuntos
/análise , Iogurte/análise , Leite , Polissacarídeos Bacterianos , Streptococcus thermophilus/crescimento & desenvolvimento , Streptococcus thermophilus/isolamento & purificação , Microbiologia de Alimentos , Amostras de Alimentos , Métodos , Métodos
2.
Braz. j. microbiol ; 42(4): 1500-1505, Oct.-Dec. 2011. graf
Artigo em Inglês | LILACS | ID: lil-614616

RESUMO

The present investigation represents the effect of freeze drying on some properties as acid and bile tolerance of Streptococcus thermophilus MTCC 1938 culture isolated from dairy products. The cell paste obtained from milk based medium was freeze dried with a pressure of 50-100 mtorr for 24h at -40ºC. Acid and bile tolerance test exhibited 3.8-4.9 and 3.2-3.8 log counts reduction after freeze drying respectively.


Assuntos
Ácido Láctico/análise , Crioprotetores/análise , Fermento Seco/análise , Laticínios/análise , Leite , Streptococcus thermophilus/isolamento & purificação , Microbiologia de Alimentos , Amostras de Alimentos , Liofilização , Métodos , Métodos
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA