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Related Concept Videos

Factors Affecting Dissolution: Particle Size and Effective Surface Area01:23

Factors Affecting Dissolution: Particle Size and Effective Surface Area

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Dissolution kinetics, an essential aspect of oral drug delivery, is significantly influenced by the drug's particle size. According to the Noyes-Whitney dissolution model, the dissolution rate correlates directly with the drug's surface area. The larger the surface area, the higher the drug's solubility in water, leading to a faster drug dissolution rate. Reducing particle size increases the effective surface area, enhancing the dissolution process. Micronization and nanosizing are...
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Cell Size01:22

Cell Size

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Cell sizes vary widely among and within organisms. Bacterial cells range between 1-10 micrometers (μm)and are considerably smaller than most eukaryotic cells. The smallest bacteria are 0.1 μm in diameter—about a thousand times smaller than eukaryotic cells, which typically range from 10-100 μm.
Surface Area
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Updated: May 3, 2026

Screening Bioactive Nanoparticles in Phagocytic Immune Cells for Inhibitors of Toll-like Receptor Signaling
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Engineered nanoparticles interacting with cells: size matters.

Li Shang, Karin Nienhaus, Gerd Ulrich Nienhaus1

  • 1Institute of Applied Physics and Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede-Strasse 1, 76131 Karlsruhe, Germany. uli.nienhaus@kit.edu.

Journal of Nanobiotechnology
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PubMed
Summary
This summary is machine-generated.

Nanoparticle (NP) size critically influences nano-bio interactions, affecting cellular uptake, localization, and potential health hazards. Understanding these size-dependent effects is vital for nanomedicine safety.

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Area of Science:

  • Nanoscience and Nanotechnology
  • Biomedical Engineering
  • Toxicology

Background:

  • Engineered nanomaterials (ENMs) offer novel applications but pose potential health risks.
  • Understanding nano-bio interactions is crucial for assessing ENM safety.
  • The impact of nanoparticle (NP) size on biological systems requires detailed investigation.

Purpose of the Study:

  • To review current research on nano-bio interactions.
  • To focus on the influence of NP size on cellular interactions.
  • To discuss NP characterization, cellular internalization, localization, and cytotoxicity.

Main Methods:

  • Literature review of peer-reviewed studies on NP size and nano-bio interactions.
  • Summary of common techniques for NP size characterization.
  • Analysis of research on NP size-dependent cellular uptake and intracellular fate.

Main Results:

  • NP size significantly impacts cellular internalization pathways (active and passive).
  • Smaller NPs may exhibit different intracellular localization compared to larger ones.
  • NP size is a key determinant of cytotoxic effects.

Conclusions:

  • NP size is a critical factor governing nano-bio interactions and potential toxicity.
  • Further research is needed to fully elucidate size-dependent mechanisms.
  • This knowledge is essential for the safe design and application of nanomaterials.