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Chemistry of Carbohydrates03:25

Chemistry of Carbohydrates

Carbohydrates are an essential part of the diet in humans and animals. Grains, fruits, and vegetables are natural sources of carbohydrates that provide energy to the body, particularly through glucose, a simple sugar that is a component of starch and an ingredient in many staple foods. The stoichiometric formula (CH2O)n, where n is the number of carbons in the molecule represents carbohydrates. In other words, the ratio of carbon to hydrogen to oxygen is 1:2:1 in carbohydrate molecules. This...
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Every plant cell has a cell wall that protects the cell, provides structural support, and gives the cell shape. Cellulose, the main structural component of the plant cell wall, makes up over 30% of plant matter. It is the most abundant organic compound on earth.  Cellulose is an unbranched polysaccharide composed of linear chains of glucose molecules linked by β (1→4) glycosidic bonds.
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The plasma membrane is a dynamic barrier composed of lipids, proteins, and carbohydrates. It is the epicenter of many cellular processes required for cell growth and survival. Carbohydrates have unique structural and chemical properties that help the plasma membrane to carry out its functions effectively.
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Nature's dendrimer: characterizing amylopectin as a multivalent host.

Sophie R Beeren1, Ole Hindsgaul

  • 1Carlsberg Laboratory, Gamle Carlsberg Vej 10, 1799 Copenhagen V (Denmark). Sophie.Beeren@carlsberglab.dk.

Angewandte Chemie (International Ed. in English)
|September 4, 2013
PubMed
Summary

A new probe, HPTS-C16 H33, quantifies branching in amylopectin, a key starch component. This method analyzes the size and distribution of helical branches in polysaccharides using NMR spectroscopy.

Keywords:
carbohydrateshydrophobic effectpolysaccharidesstarchessupramolecular chemistry

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Area of Science:

  • Biochemistry
  • Polymer Science
  • Analytical Chemistry

Background:

  • Amylopectin is the primary polysaccharide in starch, characterized by α(1,4)-linked glucose units and α(1,6)-linked branches.
  • The physical and chemical properties of amylopectin are significantly influenced by its branching pattern, including size, number, distribution, and length of branches.
  • Accurate characterization of amylopectin branching is crucial for understanding its function and applications.

Purpose of the Study:

  • To develop a novel method for the quantitative characterization of polysaccharide branching in amylopectin.
  • To utilize an amphiphilic probe for detailed analysis of amylopectin structure.
  • To enable precise measurement of helical branch characteristics in polysaccharides.

Main Methods:

  • Employing the amphiphilic probe HPTS-C16 H33, which selectively binds to terminal helical branches exceeding 12 glucose units.
  • Utilizing proton nuclear magnetic resonance ((1)H NMR) spectroscopy for detailed analysis.
  • Developing a quantitative approach to characterize polysaccharide branching based on probe binding and NMR signals.

Main Results:

  • The HPTS-C16 H33 probe effectively binds to specific helical branches of amylopectin.
  • Quantitative analysis of polysaccharide branching is achievable through (1)H NMR spectroscopy in conjunction with the probe.
  • The method allows for detailed characterization of branch size, number, and distribution.

Conclusions:

  • The developed method provides a powerful tool for the quantitative characterization of amylopectin branching.
  • HPTS-C16 H33 serves as an effective probe for analyzing polysaccharide structures.
  • This technique offers new insights into the structural complexity of starch and related polysaccharides.