Furthermore, it has been previously observed that the monomeric
composition, polymerization degree and type of glycosidic
linkages can affect the growth of probiotic strains (Rastall et al.,
2005). GOS-La obtained from Vivinal-GOS primarily consist of
b-(1-4) linkages (Coulier et al., 2009; Rastall, 2010) and GOS-Lu
consist of b-(1-6), being the most abundant trisaccharide 60-
galactosyl-lactulose (Hernández-Hernández et al., 2011). Cardelle-
Cobas et al. (2011) when studying the effect of different trisaccharides
isolated from GOS-Lu and GOS-La mixtures on different
bacteria strains, including Lactobacillus, reported a preference for
linkages b-(1-6) instead of b-(1-4); however, the results obtained in
our work showed no differences in growth responses of Lactobacillus
strains using GOS-Lu or GOS-La.