[Bacterial polysaccharides of polymyxan 88A. Basic characteristics and extent of possible uses]

Area of Science:

• Microbiology
• Biochemistry
• Polymer Science

Background:

• Polysaccharides are complex carbohydrates with diverse industrial applications.
• Characterization of novel microbial polysaccharides is crucial for expanding their utility.
• Bacillus species are known producers of various exopolysaccharides.

Purpose of the Study:

• To describe a new high-viscous polysaccharide, polymyxan, produced by Bacillus polymyxa 88A.
• To characterize the composition and properties of polymyxan.
• To investigate potential industrial applications of polymyxan.

Main Methods:

• Isolation and purification of polymyxan from Bacillus polymyxa 88A culture.
• Determination of polysaccharide molecular weight (Mw) using size-exclusion chromatography.
• Monosaccharide composition analysis via gas chromatography.
• Application testing in baking formulations and drilling mud preparation.

Main Results:

• Polymyxan is a complex polysaccharide comprising an acid high-viscous component (Mw 1-10 MD) and a neutral low-viscous glucomannan component (Mw 100-300 kD).
• The acid component contains glucose, mannose, galactose, and glucuronic acid in specific proportions.
• The neutral component is a glucomannan with equal monosaccharide amounts and trace uronic acids.

Conclusions:

• Polymyxan is a novel, structurally distinct polysaccharide with potential industrial value.
• Its unique composition and viscosity suggest utility in food processing (baking) and materials science (drilling fluids).
• Further research can optimize polymyxan production and explore additional applications.