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Microbial fermentation is central to food biotechnology, enhancing flavor, texture, preservation, and stability. Fermentative microorganisms metabolize carbohydrates into organic acids, alcohols, and other metabolites that inhibit spoilage organisms and improve digestibility while contributing distinctive sensory qualities.In baking, amylases naturally present in flour hydrolyze starch into monosaccharides such as glucose, which Saccharomyces cerevisiae ferments anaerobically. Through...
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Lactic acid bacteria (LAB) and molds are instrumental in fermenting plant-based foods to enhance preservation and ensure year-round availability. These microbial processes convert plant carbohydrates into organic acids and other metabolites that inhibit spoilage organisms and contribute to the sensory qualities of the final product.In sauerkraut production, cabbage goes through a microbial succession that starts with cocci such as Leuconostoc mesenteroides. These microbes begin fermentation by...
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Welan gum: microbial production, characterization, and applications.

Varinder Kaur1, Manav B Bera1, Parmjit S Panesar1

  • 1Biotechnology Research Laboratory, Department of Food Engineering and Technology, Sant Longowal Institute of Engineering and Technology, Longowal 148106, Punjab, India.

International Journal of Biological Macromolecules
|February 11, 2014
PubMed
Summary

Welan gum, a microbial exopolysaccharide, offers versatile applications due to its unique properties. This review details its production, characterization, and industrial uses, particularly in cement systems.

Keywords:
Alcaligenes sp.Conformation propertiesExopolysaccharideFermentationPurificationWelan

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Area of Science:

  • Biotechnology
  • Polymer Science
  • Microbiology

Background:

  • Microbial exopolysaccharides are high-molecular-weight natural polymers with diverse industrial applications.
  • Welan gum, a notable exopolysaccharide, is produced via fermentation by Alcaligenes sp.
  • Its tetrasaccharide backbone comprises l-mannose, l-rhamnose, d-glucose, and d-glucuronic acid.

Purpose of the Study:

  • To review the microbial production, purification, recovery, and characterization of welan gum.
  • To explore the biosynthesis and factors influencing welan gum production and properties.
  • To highlight the various applications of welan gum, especially in cement systems.

Main Methods:

  • Literature review of published research on welan gum.
  • Analysis of biosynthesis pathways and production parameters.
  • Examination of characterization techniques and application data.

Main Results:

  • Welan gum exhibits thickening, suspending, binding, emulsifying, stabilizing, and viscosifying properties.
  • It is a valuable biopolymer with significant commercial use in cement formulations.
  • Factors affecting production and properties are crucial for optimizing its performance.

Conclusions:

  • Welan gum is a versatile microbial polysaccharide with substantial industrial relevance.
  • Understanding its production and properties is key to expanding its applications.
  • Further research can optimize its use in various sectors, including food, pharmaceuticals, and cosmetics.