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Properties of Enantiomers and Optical Activity02:24

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It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
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Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
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Isomerism in Complexes
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Related Experiment Video

Updated: Feb 14, 2026

Detection of Endotoxin in Nano-formulations Using Limulus Amoebocyte Lysate LAL Assays
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Limulus amoebocyte lysate test via an open-microcavity optical biosensor.

Jonathan Scudder1,2, Jing Yong Ye1

  • 1The University of Texas at San Antonio, Department of Biomedical Engineering, San Antonio, Texas, United States.

Journal of Biomedical Optics
|February 8, 2018
PubMed
Summary

A novel Limulus amoebocyte lysate (LAL) assay using a photonic-crystal biosensor significantly enhances endotoxin detection. This improved LAL testing offers 200x greater sensitivity and faster results for pharmaceutical quality control.

Keywords:
Limulus amoebocyte lysateendotoxinoptical biosensor

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Area of Science:

  • Biotechnology
  • Analytical Chemistry
  • Materials Science

Background:

  • Limulus amoebocyte lysate (LAL) testing is crucial for pharmaceutical quality control, replacing animal-based pyrogenicity tests.
  • Current LAL assay detection methods (gel-clot, turbidimetric, chromogenic) face limitations in sensitivity and speed.
  • Optimizing LAL assays is essential to meet growing demands for enhanced performance.

Purpose of the Study:

  • To develop an improved Limulus amoebocyte lysate (LAL) assay with increased sensitivity and reduced assay time.
  • To introduce a novel detection mechanism for LAL testing, distinct from current industry standards.
  • To overcome the limitations of existing LAL assay methodologies.

Main Methods:

  • Development of a new LAL assay approach utilizing an open-microcavity photonic-crystal biosensor.
  • Monitoring changes in refractive index caused by the reaction between LAL reagents and endotoxins.
  • Utilizing a photonic-crystal biosensor for real-time detection, eliminating the need for sample incubation.

Main Results:

  • The novel LAL assay demonstrated a 200-fold improvement in sensitivity compared to commercial standard methods.
  • Assay time was reduced by more than half.
  • Incubation of test samples was no longer necessary, streamlining the testing process.

Conclusions:

  • The developed LAL assay approach significantly enhances sensitivity and reduces testing time.
  • This novel photonic-crystal biosensor-based method offers a promising alternative to existing LAL detection mechanisms.
  • The improved LAL assay has broad applicability in pharmaceutical quality control and beyond.