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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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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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Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
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Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
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Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
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Cellulose Nano-Films as Bio-Interfaces.

Vikram Singh Raghuwanshi1, Gil Garnier1

  • 1Bioresource Processing Research Institute of Australia (BioPRIA), Monash University, Clayton, VIC, Australia.

Frontiers in Chemistry
|August 17, 2019
PubMed
Summary
This summary is machine-generated.

Engineered cellulose thin films offer a biocompatible platform for biomolecule interactions, crucial for advancing bio-diagnostics and biomedical devices. This review explores their preparation and interaction mechanisms for novel applications.

Keywords:
biomoleculecellulosecharacterizationdiagnosticsinterfacethin film

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Area of Science:

  • Materials Science and Engineering
  • Biotechnology
  • Surface Chemistry

Background:

  • Cellulose, an abundant biopolymer, presents significant potential for sustainable and bio-friendly technological products.
  • Nanoscale cellulose films exhibit transparency, smoothness, and large surface areas ideal for biomolecule immobilization and interaction studies.
  • The hydroxyl groups on cellulose allow for chemical modification, enabling tailored interface properties for biomedical applications.

Purpose of the Study:

  • To review the methods for preparing cellulose thin films and analyze biomolecule interactions at their interfaces.
  • To highlight challenges and opportunities in engineering cellulose thin films for controlling biomolecule interactions.
  • To provide insights for developing advanced biomedical devices utilizing cellulose-based interfaces.

Main Methods:

  • Preparation of cellulose thin films via spin coating, Langmuir-Blodgett, or Langmuir-Schaefer methods from dispersed or dissolved cellulose.
  • Analysis of biomolecule (antibodies, enzymes) adsorption, conformation, and activity on cellulose interfaces under dry and wet conditions.
  • Advanced characterization using X-ray/neutron scattering, atomic force microscopy (AFM), quartz crystal microbalance (QCM), microscopy, and ellipsometry.

Main Results:

  • Film properties (thickness, roughness, morphology, crystallinity, water swelling) are influenced by cellulose source, preparation, coating method, and substrate pre-treatment.
  • Surface morphology, thickness, crystallinity, and pre-treatment affect biomolecule adsorption, conformation, coverage, longevity, and activity.
  • Characterization techniques enable visualization and quantification of cellulose-biomolecule interphase morphology and biomolecule behavior.

Conclusions:

  • Engineering cellulose thin films offers advantages for biomedical applications by controlling biomolecule interactions at the molecular level.
  • Understanding these interactions is key to designing efficient and functional next-generation biomedical devices.
  • Cellulose thin films serve as versatile substrates for bio-diagnostics and fundamental biomolecular interaction studies.