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Dialysis

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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Detection of Endotoxin in Nano-formulations Using Limulus Amoebocyte Lysate (LAL) Assays

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Published on: January 30, 2019

High sensitivity pyrogen testing in water and dialysis solutions.

Mardas Daneshian¹, Albrecht Wendel, Thomas Hartung

¹Biochemical Pharmacology, University of Konstanz, Germany.

Journal of Immunological Methods

|May 14, 2008

Summary

A new In vitro Pyrogen Test (IPT) detects human-relevant pyrogens in dialysis solutions with high sensitivity. This method improves upon the Limulus Amoebocyte Lysate Assay (LAL) for patient safety.

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Area of Science:

Biomedical Science
Clinical Chemistry
Immunology

Background:

Dialysis patients are exposed to large volumes of dialysis solutions, necessitating rigorous safety testing.
Current pyrogen testing methods like the Limulus Amoebocyte Lysate Assay (LAL) have limitations in sensitivity and do not fully reflect human immune responses.
Low-level pyrogen contamination can lead to chronic pathologies in dialysis patients.

Purpose of the Study:

To adapt the In vitro Pyrogen Test (IPT) for the sensitive detection of pyrogens in dialysis solutions.
To enhance the sensitivity of pyrogen detection in dialysis fluids to levels relevant for patient safety.

Main Methods:

Adapted the In vitro Pyrogen Test (IPT), which uses human whole blood to measure interleukin-1beta release, for dialysis solution analysis.
Utilized albumin-coated microspheres to pre-incubate samples, enhancing assay sensitivity.

Main Results:

Achieved high sensitivity for pyrogen detection, down to 0.1 pg/ml lipopolysaccharide (LPS) or 0.001 EU/ml.
Successfully enabled pyrogen detection in both dialysis concentrates and final working solutions.
Demonstrated enhanced sensitivity through preincubation with albumin-coated microspheres.

Conclusions:

The adapted IPT provides highly sensitive detection of human-relevant pyrogens in dialysis solutions.
This method offers a significant improvement over existing assays for ensuring the safety of dialysis fluids.