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Updated: May 8, 2026

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

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

Published on: January 30, 2019

Allantoin as a solid phase adsorbent for removing endotoxins.

Vincent Vagenende¹, Tim-Jang Ching, Rui-Jing Chua

¹Bioprocessing Technology Institute, A*STAR (Agency for Science, Technology and Research), 20 Biopolis Way #06-01 Centros, Singapore 138668, Singapore.

Journal of Chromatography. A

|September 5, 2013

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This study introduces allantoin crystals as an effective adsorbent for removing endotoxins from protein solutions. The simple method achieves high endotoxin clearance while preserving protein integrity and activity.

Area of Science:

Biochemistry
Protein purification
Biotechnology

Background:

Endotoxins are pyrogenic contaminants in protein preparations.
Existing endotoxin removal methods can be complex or affect protein integrity.

Purpose of the Study:

To develop a simple, robust, and effective method for endotoxin removal from protein solutions.
To evaluate the efficacy of allantoin as a solid-phase adsorbent for endotoxin clearance.

Main Methods:

Utilizing allantoin crystalline powder as a solid-phase adsorbent.
Adding allantoin to protein solutions at supersaturated concentrations.
Removing endotoxin-bound allantoin crystals via filtration or centrifugation.

Main Results:

Keywords:

Endotoxins Hydrogen-bond based adsorption Lipopolysaccharides Protein purification Supersaturated allantoin

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Last Updated: May 8, 2026

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

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Published on: January 30, 2019

Removal of Arsenic Using a Cationic Polymer Gel Impregnated with Iron Hydroxide

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Published on: June 28, 2019

Air-sampled Filter Analysis for Endotoxins and DNA Content

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Published on: March 7, 2016

Achieved an average endotoxin removal of 99.98% across 20 test proteins.
Obtained an average protein recovery of approximately 80%.
Demonstrated that endotoxin binding is largely independent of pH, conductivity, and solvents, suggesting a hydrogen-bond mechanism.

Conclusions:

Allantoin crystals offer a superior endotoxin removal method compared to anion exchange, polymyxin affinity, and biological affinity methods.
Allantoin effectively removes endotoxins without compromising protein activity or stability.
This method is a simple, robust, and efficient approach for endotoxin clearance in protein purification.