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Related Concept Videos

Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
Analyte Adsorption and Distribution01:09

Analyte Adsorption and Distribution

In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and solvents...
Adsorption Isotherms I01:29

Adsorption Isotherms I

Adsorption isotherms are mathematical models that describe how molecules in a gas or liquid phase interact with surfaces. Two of the most common isotherm models are the Langmuir and Freundlich isotherms, which relate to Type I monolayer chemisorption. The Langmuir model is based on four key assumptions:• Adsorption cannot exceed monolayer coverage.• All surface sites are equivalent.• Molecules adsorb only at vacant sites.• There are no interactions between adsorbed molecules.Consider the...
Facilitated Diffusion01:16

Facilitated Diffusion

The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
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Silica Gel Column Chromatography: Overview01:10

Silica Gel Column Chromatography: Overview

Silica gel column chromatography is a technique for separating compounds using a column packed with silica gel as the stationary phase. This method relies on differences in the polarity of compounds. Based on their polarities, compounds move between the stationary phase (silica gel) and the mobile phase (the solvent), forming discrete bands in the column.
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Dialysis01:15

Dialysis

Dialysis is a diffusion-based purification process that separates analyte molecules from a complex matrix. This is accomplished by allowing molecules in the solution to pass through a semipermeable membrane into a liquid on the other side. The membrane is usually made of cellulose acetate or cellulose nitrate, and the second liquid must be miscible with the solution. Ions (e.g., chloride or sodium) or organic molecules (e.g., glucose) can pass through the membrane pores, which generally have...

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Related Experiment Video

Updated: Jun 1, 2026

Monitoring Protein Adsorption with Solid-state Nanopores
08:51

Monitoring Protein Adsorption with Solid-state Nanopores

Published on: December 2, 2011

Diffusion-controlled protein adsorption in mesoporous silica.

Shan Lu1, Zhihong Song, Jing He

  • 1State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.

The Journal of Physical Chemistry. B
|May 21, 2011
PubMed
Summary
This summary is machine-generated.

Optimal pore size in SBA-15 supports enhances porcine pancreatic lipase (PPL) adsorption. Researchers studied PPL diffusion and distribution, finding an 8.0 nm pore size maximizes protein uptake.

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Area of Science:

  • Materials Science
  • Biochemistry
  • Chemical Engineering

Background:

  • SBA-15 mesoporous silica is a widely used support material.
  • Understanding protein diffusion and adsorption within porous materials is crucial for applications like biocatalysis and drug delivery.
  • Porcine pancreatic lipase (PPL) is a key enzyme with significant industrial applications.

Purpose of the Study:

  • To investigate the influence of pore size on porcine pancreatic lipase (PPL) diffusion and distribution within SBA-15 supports.
  • To determine the optimal pore size for maximizing PPL adsorption capacity.
  • To elucidate the diffusion mechanisms and confinement effects of PPL within mesopores.

Main Methods:

  • Confocal laser scanning microscopy (CLSM) for visualizing PPL distribution.
  • X-ray diffraction (XRD) for structural analysis and confinement effects.
  • Hindered diffusion simulation and intraparticle diffusion analysis.
  • Apparent kinetics calculation.

Main Results:

  • PPL diffusion depth is pore size-dependent, with deeper penetration into 8.0 and 9.7 nm pores compared to 5.6 nm pores.
  • Hindered diffusion modeling accurately predicted PPL distribution observed by CLSM.
  • Intraparticle diffusion analysis revealed boundary resistance and estimated PPL populations inside pores versus on the external surface.
  • Maximum PPL uptake was observed in 8.0 nm pores, suggesting an optimal pore size for adsorption capacity.
  • XRD and diffusion analysis confirmed PPL confinement within the mesoporous structure.

Conclusions:

  • Pore size significantly impacts PPL diffusion and adsorption in SBA-15.
  • An optimal pore size (8.0 nm) exists for maximizing PPL adsorption capacity, balancing diffusion and confinement.
  • Boundary resistance plays a role in the overall adsorption process.
  • The findings provide valuable insights for designing mesoporous materials for enzyme immobilization and other applications.