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Biosynthesis of Polysaccharides01:26

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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 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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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
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Lipids include a diverse group of compounds that are largely nonpolar in nature. This is because they are hydrocarbons that include mostly nonpolar carbon-carbon or carbon-hydrogen bonds. Non-polar molecules are hydrophobic (“water fearing”), or insoluble in water. Lipids perform many different functions in a cell. Cells store energy for long-term use in the form of fats. Lipids also provide insulation from the environment for plants and animals. For example, they help keep aquatic...
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Viruses are extraordinarily diverse in shape and size, but they all have several structural features in common. All viruses have a core that contains a DNA- or RNA-based genome. The core is surrounded by a protective coat of proteins called the capsid. The capsid is composed of subunits called capsomeres. The capsid and genome-containing core are together known as the nucleocapsid.
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Related Experiment Video

Updated: Feb 4, 2026

Structural Characterization of Mannan Cell Wall Polysaccharides in Plants Using PACE
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Polysaccharides from Pleurotus eryngii: sequential extraction and structural characterization.

Ziyan Sun1, Zhicong Song1, Andong Zhou1

  • 1Engineering Research Center of Glycoconjugates of Ministry of Education, Jilin Provincial Key Laboratory of Chemistry and Biology of Changbai Mountain Natural Drugs, School of Life Sciences, Northeast Normal University, Changchun 130024, China.

Food Chemistry: X
|February 2, 2026
PubMed
Summary
This summary is machine-generated.

Pleurotus eryngii polysaccharides were extracted using a novel sequential method. This study identified five distinct polysaccharide structures, including a new alpha-1,2-D-mannan, offering insights into their composition.

Keywords:
GalactanGlucanMannanPleurotus eryngiiPolysaccharideSequential extraction

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Area of Science:

  • Mycology
  • Carbohydrate Chemistry
  • Biochemistry

Background:

  • Polysaccharides from Pleurotus eryngii (P. eryngii) exhibit various biological activities.
  • Understanding their structural diversity is crucial for exploring their potential applications.
  • Existing extraction methods may not fully capture the complexity of P. eryngii polysaccharides.

Purpose of the Study:

  • To develop and validate a sequential extraction strategy for P. eryngii polysaccharides.
  • To characterize the structural features and relative abundance of extracted polysaccharides.
  • To identify novel polysaccharide structures within P. eryngii.

Main Methods:

  • A sequential extraction strategy employing gradient-enhanced solvent purification was utilized.
  • Methods included cold and hot water extraction, enzyme-assisted extraction, and dilute/concentrated alkali treatments.
  • Purified polysaccharides were characterized using advanced analytical techniques.

Main Results:

  • Five distinct polysaccharides (CWP, HWP, EAP, DAP, CAP) were obtained with improved total yield.
  • Eight homogeneous polysaccharides were isolated after purification.
  • P. eryngii polysaccharides comprised five structural types: beta-1,3-D-glucan, beta-1,6-D-glucan, alpha-1,6-D-galactan, alpha-1,3-D-mannan, and a novel alpha-1,2-D-mannan.
  • The relative abundance ratio of these structures was determined as 20:7:4.3:1.6:1.

Conclusions:

  • The developed sequential extraction method is effective and enhances polysaccharide yield.
  • P. eryngii contains a diverse array of polysaccharide structures, including a previously undescribed alpha-1,2-D-mannan.
  • This research lays the groundwork for future studies on P. eryngii polysaccharide structure-activity relationships and applications.