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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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Green and Low-cost Production of Thermally Stable and Carboxylated Cellulose Nanocrystals and Nanofibrils Using Highly Recyclable Dicarboxylic Acids
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Functionalizing Cellulose Nanocrystals with Click Modifiable Carbohydrate-Binding Modules.

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Researchers developed a greener method to functionalize cellulose nanocrystals (CNCs) using carbohydrate binding modules (CBMs) and Click chemistry. This approach enhances CNC properties for applications in nanomedicine and drug delivery.

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Area of Science:

  • Materials Science
  • Biotechnology
  • Nanotechnology

Background:

  • Cellulose nanocrystals (CNCs) offer unique properties for applications like drug delivery and hydrogels.
  • Current chemical functionalization methods for CNCs have significant environmental drawbacks.
  • Modifying the inert cellulose surface in aqueous media presents a substantial challenge.

Purpose of the Study:

  • To develop an environmentally friendly method for functionalizing cellulose nanocrystals (CNCs).
  • To introduce new functionalities to CNC surfaces using carbohydrate binding modules (CBMs).
  • To enhance CNC properties for improved performance in various applications.

Main Methods:

  • Utilized CBM2a, a module with high affinity for crystalline cellulose, functionalized with an alkyne.
  • Employed a Click reaction between the alkyne on CBM2a and polyethylene glycol (PEG).
  • Performed the modification in a one-pot reaction within aqueous media.

Main Results:

  • Achieved strong, non-covalent modification of CNC surfaces with PEG via CBM2a.
  • Demonstrated improved CNC redispersion after drying and enhanced suspension stability.
  • Successfully produced hybrid polysaccharide-protein self-assembled nanoparticles.

Conclusions:

  • CBM-mediated functionalization offers a greener alternative to traditional chemical methods for CNC modification.
  • The developed method enhances CNC dispersibility and stability through steric interactions.
  • The resulting hybrid nanoparticles show promise for nanomedicine, immunoassay, and drug delivery systems.