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Carbon Nanotubes Activate Limulus Amebocyte Lysate Coagulation by Interface Adsorption.

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Summary

Oxidized multiwalled carbon nanotubes (O-MWCNT) can trigger false positives in Limulus amebocyte lysate (LAL) assays. This interference occurs because O-MWCNT activates the LAL enzyme cascade, impacting endotoxin testing for biomaterials.

Keywords:
carbon nanotubesendotoxin contaminationenzyme activationinterface interactionlimulus amebocyte lysateprotein adsorption

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Limulus amebocyte lysate (LAL) assay is crucial for detecting endotoxin contamination in biomaterials.
  • Carbon nanotubes, particularly multiwalled carbon nanotubes (MWCNT), have significant biomedical applications.
  • Ensuring the accuracy of endotoxin detection is vital for biomaterial safety and efficacy.

Purpose of the Study:

  • To investigate the potential interference of oxidized multiwalled carbon nanotubes (O-MWCNT) with LAL assays.
  • To determine if O-MWCNT can cause false positive results in endotoxin detection.
  • To elucidate the mechanism by which O-MWCNT might affect LAL assay outcomes.

Main Methods:

  • Utilized both gel-clotting and end-point chromogenic LAL assay methods.
  • Tested endotoxin-free O-MWCNT dispersed in aqueous solutions.
  • Analyzed the interaction between O-MWCNT and the enzymes within the LAL assay.

Main Results:

  • Endotoxin-free O-MWCNT demonstrated the ability to activate both gel-clotting and chromogenic LAL assays.
  • The activation involved the conversion of coagulogen to coagulin, indicating an enzymatic cascade initiation.
  • Interfacial interactions between O-MWCNT and LAL assay enzymes were identified as the mechanism.

Conclusions:

  • O-MWCNT can induce false positive results in LAL assays for endotoxin detection.
  • The nanomaterial activates the LAL enzyme cascade through interfacial interactions.
  • This finding highlights the need to consider nanomaterial interference in biomaterial safety assessments.