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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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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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Cellulose and Pectic Polysaccharides01:15

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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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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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Protein glycosylation starts in the ER lumen and continues in the Golgi apparatus. Glycosyltransferases catalyze the addition of sugar molecules or glycosylation of proteins. Usually, these enzymes add sugars to the hydroxyl groups of selected serine or threonine residues to form O-linked glycans or the amino groups of asparagine residues to form N-linked glycans. Different positions on the same polypeptide chain can contain differently linked glycans.
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Lipopolysaccharides (LPS) are crucial components of the outer membrane of Gram-negative bacteria, serving both structural and functional roles. It contributes to membrane stability and protects bacteria from host immune responses. LPS is composed of three major regions—lipid A, a core oligosaccharide, and an O antigen. The biosynthesis and assembly of LPS involve a highly coordinated set of enzymatic reactions and transport mechanisms. Additionally, LPS is recognized as an endotoxin,...
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Crystalline polysaccharides: A review.

Farzad Seidi1, Mohsen Khodadadi Yazdi2, Maryam Jouyandeh2

  • 1Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources and International Innovation Center for Forest Chemicals and Materials, Nanjing Forestry University, Nanjing 210037, China.

Carbohydrate Polymers
|November 7, 2021
PubMed
Summary
This summary is machine-generated.

Polysaccharide properties and applications depend on their crystalline structure. This review details polysaccharide crystallization kinetics and crystalline domains, linking them to material properties and uses.

Keywords:
BiodegradabilityCrystallinityCrystallizationMechanical propertiesPolysaccharide

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biochemistry

Background:

  • Polysaccharide properties like biodegradability and mechanical strength are influenced by their architecture and crystallinity.
  • Crystalline zones significantly dictate the final properties and applications of polysaccharides, ranging from packaging to biomedicine.
  • Existing reviews often cover polysaccharide synthesis and characterization but lack a comprehensive focus on crystallization kinetics and crystalline domains.

Purpose of the Study:

  • To comprehensively review the effects of crystallization kinetics and crystalline domains on polysaccharide properties and applications.
  • To focus on the crystallization aspects of major polysaccharides: cellulose, chitin, chitosan, and starch.
  • To provide a complete overview of the crystallization-property relationship in polysaccharides.

Main Methods:

  • Literature review focusing on crystallization kinetics and crystalline domains of polysaccharides.
  • Discussion of crystallization processes in cellulose, chitin, chitosan, and starch.
  • Overview of applications of crystalline and nano-polysaccharides, including their interactions.

Main Results:

  • Crystallinity is a critical factor governing polysaccharide properties and applications.
  • The review synthesizes information on the crystallization of key polysaccharides.
  • Applications of crystalline polysaccharides and their interactions are detailed.

Conclusions:

  • Understanding polysaccharide crystallization is key to tailoring their properties for diverse applications.
  • This review highlights the crucial link between crystallization and polysaccharide performance.
  • Further research into crystallization kinetics can optimize polysaccharide utilization in various fields.