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Biosynthesis of Polysaccharides

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Polysaccharides such as glycogen and starch are synthesized from nucleoside diphosphate sugars, primarily uridine diphosphate glucose (UDPG) and adenosine diphosphate glucose (ADPG). These activated glucose donors act as key intermediates in carbohydrate metabolism and biosynthesis. UDPG primarily involves glycogen synthesis in animals and many bacteria, while ADPG plays a fundamental role in starch synthesis in plants and certain bacteria.UDPG is formed when glucose-1-phosphate reacts with...
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Related Experiment Video

Updated: Apr 12, 2026

Sequencing of Plant Wall Heteroxylans Using Enzymic, Chemical Methylation and Physical Mass Spectrometry, Nuclear Magnetic Resonance Techniques
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Sequencing of Plant Wall Heteroxylans Using Enzymic, Chemical Methylation and Physical Mass Spectrometry, Nuclear Magnetic Resonance Techniques

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Mannich reaction of polysaccharides: Xylan functionalization in aqueous basic medium.

Cüneyt H Ünlü1, Meltem Kutlu1, Oya Galioğlu Atıcı1

  • 1Istanbul Technical University, Faculty of Science and Letters, Department of Chemistry, Maslak TR34469, Istanbul, Turkey.

Carbohydrate Polymers
|May 13, 2015
PubMed
Summary
This summary is machine-generated.

This study modified xylan using the Mannich reaction, creating a new material with enhanced film-forming properties and bacteriostatic activity. The modified xylan shows potential for various applications due to its improved characteristics.

Keywords:
AminomethylationAntimicrobialityMannich reactionPolysaccharideXylan

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Area of Science:

  • Biochemistry
  • Polymer Chemistry
  • Materials Science

Background:

  • Xylan, a polysaccharide from plant cell walls, has limited applications due to its properties.
  • Chemical modification offers a route to enhance xylan's functionality.
  • The Mannich reaction is a versatile method for introducing amine groups into organic molecules.

Purpose of the Study:

  • To chemically modify xylan using the Mannich reaction.
  • To characterize the resulting dimethylaminomethylated xylan.
  • To evaluate the properties and potential applications of the modified xylan.

Main Methods:

  • Xylan from corn cobs was reacted with formaldehyde and dimethylamine in an aqueous basic solution.
  • The Mannich reaction conditions (concentration, temperature, time) were optimized.
  • Characterization involved nitrogen content analysis, 1D and 2D NMR spectroscopy, and film formation tests.
  • Antimicrobial activity was assessed.

Main Results:

  • Successful dimethylaminomethylation of xylan was achieved, with optimal modification at 35°C yielding 4.6% nitrogen content.
  • NMR spectroscopy confirmed the presence of aminomethyl groups attached to oxygen sites.
  • Modified xylan exhibited improved film-forming capabilities compared to unmodified xylan.
  • The modified xylan demonstrated bacteriostatic antimicrobial activity.

Conclusions:

  • The Mannich reaction effectively modifies xylan, introducing aminomethyl groups.
  • Modified xylan possesses enhanced material properties, including film formation.
  • The bacteriostatic activity suggests potential use as an antimicrobial agent.