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Aggregation and adhesion properties of 22 Lactobacillus
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Abstract: In this paper, the auto-aggregating, co-aggregating, hydrophobicity and adhering abilities of
22 Lactobacillus strains belonging to different species were assessed. There was no correlation between
auto-aggregation and adhesion of the strains belonging to different species, while there was positive
correlation (P0.05) between auto-aggregation and adhesion of the strains belonging to same species.
After treating by guanidine HCl, the auto-aggregating and adhering abilities of some Lactobacillus
strains decreased, indicating that surface-bound protein and other macro-molecular played role in the
adhering and auto-aggregating abilities. The strains Lactobacillus plantarum 20 and 66 had higher
adhdsion and coaggregation abilities should be further studied for their probably probiotic properties.
Aggregating, co-aggregating and adhering abilities of Lactobacillus strains could be just used as the
preliminary criteria for selecting strains having probiotic potential.
Key words: auto-aggregating, coaggregating, hydrophobicity, adhesion
0 Introduction
A probiotic is generally defined as “a live microorganism which, when administered in
adequate amounts, confers health benefit on the host” [1]. Lactobacillus could exert beneficial
effect on humans by inhibiting invasion of pathogens, improving the epithelial barrier
function, modulating host immune system, and so on [2]. Many strains of Lactobacilli have a
variety of health-promoting effects in humans. Adherence and colonization of Lactobacillus
strains in gastrointestinal tract is the prerequisite for the strains to exhibit beneficial effect on
humans[3]. The assessment of autoaggregation, coaggregation, hydrophobicity and adherence
to intestinal epithelial cell lines (Caco-2 cell and HT-29 cell) of Lactobacillus strains has been
used as in vitro methods to screen strains having probiotic potential[4-7].
Human enteroc
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