CERELA   05438
CENTRO DE REFERENCIA PARA LACTOBACILOS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Exopolisacarides From Lactic Acid Bacteria: Biodiversity And Technological Potencial.
Autor/es:
FERNANDA MOZZI; CECILIA RODRÍGUEZ; ROEL VAN DER MEULEN; RAÚL RAYA; LUC DE VUYST; FONT DE VALDEZ, G.
Lugar:
San Miguel de Tucumán
Reunión:
Congreso; II Simposio Internacional de Bacterias Lácticas. Primer Encuentro Red BAL Argentina.; 2006
Institución organizadora:
CERELA-CONICET
Resumen:
Certain
lactic acid bacteria (LAB) produce exopolysaccharides (EPS), which can
be synthesized as capsular polysaccharide (CPS), loosely attached to
the cell surface, or as slime EPS, secreted into the environment. These
biopolymers can be either homopolysaccharides (HoPS), composed of one
type of monosaccharide, or heteropolysaccharides (HePS) formed by
repeating units containing two or more different monosaccharides. A
broad biodiversity of heteropolysaccharides (HePS) from LAB exists
concerning the type of EPS produced (CPS/slime), their monomer
composition, molecular mass, glycosidic unions and yields; these
characteristics being determinant for their functionality. The EPS
biodiversity might be related to the diverse sugar nucleotides
biosynthetic routes and the genetic potential of the strains. EPS from
LAB have found industrial application due to their interesting
rheological properties and the food-grade status of the producing
strains. LAB strains are widely used in the fermented food industry and
their in situ EPS production has been employed in the
elaboration of dairy products mainly fermented milks (stirred and
drinking yogurts) and more recently in the manufacture of low fat
cheeses (Mozzarella and Cheddar type). Moreover, it has been claimed
that these biopolymers have potential health benefits and play a role
in certain biological functions such as protecting the cells against
adverse environmental conditions. Recently, it has been suggested that
CPS formation by Streptococcus thermophilus strains could
protect the cells from phage attack. Exploiting the biodiversity of
HePS from LAB and polymer-producing strains could open up the
possibility to achieve new/desired functionalities.