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Updated: Aug 7, 2026
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Cholesterol Efflux Assay
Published on: March 6, 2012
A rapid, simple high capacity cholesterol crystal growth assay
1Department of Surgery, Washington, University, St. Louis, MO 63110, USA.
Journal of Lipid Research
|September 1, 1995
Summary
This study introduces a rapid spectrophotometric assay for measuring cholesterol crystal growth. The new method accurately assesses the potency of nucleating agents in bile, offering a high-throughput alternative to traditional microscopy.
Area of Science:
- Biochemistry
- Analytical Chemistry
- Cell Biology
Background:
- Cholesterol crystal nucleation time assesses nucleating agent potency.
- Conventional methods use polarizing light microscopy, which can be time-consuming.
- A more efficient assay is needed for high-throughput analysis.
Purpose of the Study:
- To adapt a spectrophotometric method for quantifying cholesterol crystal growth.
- To validate this new assay against traditional microscopy methods.
- To assess the potency of biliary immunoglobulins as nucleating agents.
Main Methods:
- A spectrophotometric method was adapted to a microtiter plate reader.
- Model biles with controlled cholesterol saturation were used.
- Cholesterol crystal growth was measured by absorbance at 630 nm and correlated with crystal counts via microscopy.
Main Results:
- Cholesterol crystal growth curves were generated using the microtiter plate reader.
- The spectrophotometric assay showed results comparable to polarizing light microscopy.
- Biliary IgM was confirmed as a more potent nucleating agent than biliary IgG.
Conclusions:
- A rapid, high-capacity spectrophotometric assay using microplates and a microtiter plate reader was developed.
- This method effectively detects cholesterol crystal growth for nucleation assays.
- The assay provides a valuable tool for assessing nucleating agent potency in bile.
