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Related Concept Videos

Membrane Fluidity01:23

Membrane Fluidity

Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.Fatty acids tails of phospholipids can be either saturated or...
Membrane Fluidity01:26

Membrane Fluidity

Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
Mosaic nature of the membrane
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Membrane Lipids01:32

Membrane Lipids

Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...
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Membrane Carbohydrates

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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Types of Membrane Protrusions01:28

Types of Membrane Protrusions

The protrusion of the cell surface is an initial step for several cellular processes, including cell migration, phagocytosis, and neurite outgrowth. These membrane protrusions are a result of cytoskeletal rearrangement. The most  widely observed cell protrusions include lamellipodia, pseudopodia, filopodia, microvilli, invadopodia, and podosomes. These protrusions can be of two types — static or dynamic.
The microvilli, an example of stable protrusions, are finger-like projections with a...
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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.
Membrane carbohydrates do not have any hydrophobic region and are exclusively located on the cell's outer surface. The addition of sugar molecules or glycosylation of proteins happens in...

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Carboxymethyl Polysaccharides/Montmorillonite Biocomposite Films and Their Sorption Properties.

Adrian Krzysztof Antosik1, Marcin Bartkowiak1, Magdalena Zdanowicz2

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New bionanocomposite films made from carboxymethyl starch and cellulose with sodium montmorillonite exhibit high absorbency. These advanced wound dressing materials offer excellent moisture absorption and mechanical durability for wound care applications.

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Polymer Chemistry

Background:

  • Development of advanced wound dressings is crucial for effective wound healing.
  • Biodegradable and absorbent materials are sought for wound exudate management.
  • Nanocomposite technology offers enhanced material properties for biomedical applications.

Purpose of the Study:

  • To synthesize and characterize bionanocomposite films using carboxymethyl starch (CMS) and carboxymethyl cellulose (CMC) with sodium montmorillonite (MMT-Na).
  • To evaluate the potential of these films as absorbent materials for wound dressings.
  • To investigate the effect of MMT-Na filler concentration on film properties.

Main Methods:

  • Synthesis of bionanocomposite films using CMS, CMC, and potato starch.
  • Incorporation of sodium montmorillonite (MMT-Na) as a filler.
  • Crosslinking with citric acid and plasticization with glycerol.
  • Evaluation of film properties: water solubility, swelling, moisture absorption, tensile strength, elongation at break, and Young's modulus.

Main Results:

  • The developed bionanocomposite films demonstrated high absorbency and potential for wound dressing applications.
  • Filler concentration significantly influenced film stability, durability, and moisture absorption.
  • A two-component CMS/CMC film with 5 parts per hundred (pph) MMT-Na exhibited optimal absorption capacity and mechanical properties.

Conclusions:

  • Bionanocomposite films based on carboxymethyl derivatives of starch and cellulose are promising for absorbent wound dressings.
  • Sodium montmorillonite acts as an effective filler, enhancing the performance of the films.
  • The optimized CMS/CMC/MMT-Na nanocomposite is suitable for applications requiring high moisture absorption, such as wound exudate management.