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Related Experiment Video

Updated: Jun 19, 2026

Manufacture and Drug Delivery Applications of Silk Nanoparticles
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Optimizing Silk Nanoparticle Assembly with Potassium Ions: Effects on Physicochemical Properties and Encapsulation

Napaporn Roamcharern1, Daniel J Brady2, John A Parkinson3

  • 1Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, 161 Cathedral St., Glasgow G4 0RE, Scotland, U.K.

ACS Applied Bio Materials
|August 7, 2025
PubMed
Summary

Potassium ions enhance silk nanoparticle formation for drug delivery. This study shows K+ improves silk assembly, payload encapsulation, and reduces toxicity, making silk nanoparticles a promising drug carrier.

Keywords:
Bombyx moriantisolvent precipitationmetal ionnanomedicinesilk fibroin

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Drug Delivery

Background:

  • Silk fibroin is a biocompatible and biodegradable material suitable for nanocarrier drug delivery.
  • Metal ions in the silkworm gland can influence silk fibroin's conformation, structure, and self-assembly.
  • Previous research indicated calcium ions (Ca2+) aid silk nanoparticle fabrication.

Purpose of the Study:

  • To investigate the influence of potassium ions (K+) on silk nanoparticle formation and properties.
  • To explore K+ as a modulator of silk fibroin self-assembly for distinct physicochemical profiles.
  • To assess the impact of K+ on silk nanoparticle characteristics, including yield, size, surface charge, and drug encapsulation.

Main Methods:

  • Fabrication of silk nanoparticles with and without K+.
  • Characterization of nanoparticle size, surface charge (zeta potential), and production yield.
  • Evaluation of payload encapsulation efficiency.
  • Assessment of nanoparticle toxicity and inflammatory response in vitro.

Main Results:

  • K+ significantly enhances silk assembly and increases nanoparticle size.
  • K+ alters the surface charge (zeta potential) of silk nanoparticles.
  • K+ boosts production yield and improves payload encapsulation efficiency.
  • Silk nanoparticles fabricated with K+ exhibit reduced toxicity and inflammatory potential.

Conclusions:

  • K+ is a potent modulator of silk nanoparticle formation and properties.
  • K+ inclusion is valuable for optimizing silk nanoparticle characteristics for drug delivery applications.
  • Silk nanoparticles fabricated with K+ show promise as safe and effective drug delivery nanocarriers.