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Structural study on an exocellular polysaccharide produced by Lactobacillus helveticus TY1-2
Y Yamamoto1, S Murosaki, R Yamauchi
1United Graduate School of Agricultural Science, Gifu University, Japan.
Carbohydrate Research
|August 3, 1994
Summary
Lactobacillus helveticus TY1-2 synthesizes a complex exocellular polysaccharide. This novel heteropolymer consists of specific sugar residues and has a defined branched heptasaccharide repeating unit structure.
Area of Science:
- Microbiology
- Biochemistry
- Polymer Science
Background:
- Lactobacillus helveticus is known for producing various compounds during fermentation.
- Exocellular polysaccharides (EPS) can influence food texture and probiotic properties.
- Understanding EPS structure is crucial for potential applications.
Purpose of the Study:
- To characterize the exocellular polysaccharide produced by Lactobacillus helveticus TY1-2.
- To elucidate the primary structure of this novel bacterial polysaccharide.
Main Methods:
- Culturing Lactobacillus helveticus TY1-2 in reconstituted skim milk.
- Employing glycose analysis, methylation analysis, and Smith degradation.
- Utilizing Nuclear Magnetic Resonance (NMR) spectroscopy for structural determination.
Main Results:
- Isolation and characterization of a high molecular weight heteropolymer.
- Identification of D-glucopyranosyl, D-galactopyranosyl, and 2-acetamido-2-deoxy-D-glucopyranosyl residues in a specific molar ratio (3.0:2.8:0.9).
- Determination of a branched heptasaccharide repeating unit as the primary structure.
Conclusions:
- Lactobacillus helveticus TY1-2 produces a structurally defined exocellular polysaccharide.
- The elucidated structure provides a basis for investigating its functional properties.
- This finding contributes to the understanding of bacterial polysaccharide biosynthesis.