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Updated: Sep 16, 2025
Detection of Endotoxin in Nano-formulations Using Limulus Amoebocyte Lysate LAL Assays
Published on: January 30, 2019
Triple-optimization fiber-optic endotoxin-sensing strategy utilizing Limulus Amebocyte Lysate (LAL)
Qingyue Ye1, Haopeng Wang1, Qiu Yang2
1Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou, 510632, China; College of Physics & Optoelectronic Engineering, Jinan University, Guangzhou, 510632, China.
This study introduces a novel fiber-optic biosensor for rapid and sensitive lipopolysaccharide (LPS) detection, addressing limitations of current endotoxin assays. The platform offers a sustainable and efficient solution for sepsis diagnostics while conserving horseshoe crab populations.
Area of Science:
- Biomedical Engineering
- Environmental Science
- Analytical Chemistry
Background:
- Accurate lipopolysaccharide (LPS) detection is vital for sepsis management.
- The gold standard Limulus Amebocyte Lysate (LAL) assay faces ecological and efficiency challenges.
- Existing alternatives lack optimal sensitivity, speed, and reagent efficiency.
Purpose of the Study:
- To develop a sustainable and highly sensitive fiber-optic biosensing platform for LPS detection.
- To overcome the limitations of current endotoxin detection methods.
- To reconcile clinical needs with environmental conservation efforts.
Main Methods:
- Integration of tapered and Er/Yb co-doped Fiber Bragg Gratings (FBGs) in a microfluidic capillary.
- Label-free LPS quantification via refractive index changes using unreacted LAL adsorption.
- Closed-loop photothermal incubation for accelerated reaction kinetics and microfluidic reagent reduction.
Main Results:
- Achieved a sensitivity of <0.001 EU/mL, 10-fold higher than chromogenic methods.
- Reduced LAL consumption by 95% (<5 μL per test) with 10-minute reaction times.
- Demonstrated multiple sensor reuses without performance degradation via a competitive binding protocol.
Conclusions:
- The developed fiber-optic biosensor offers superior sensitivity, speed, and sustainability for endotoxin monitoring.
- This technology provides a scalable and ethical alternative for clinical diagnostics and biodiversity conservation.
- The platform addresses critical gaps in current endotoxin detection, supporting global healthcare and environmental needs.
