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Sample Preparation for Analysis: Advanced Techniques

Sample Preparation for Analysis: Advanced Techniques

Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...

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Updated: Feb 19, 2026

Microfluidic Production of Lysolipid-Containing Temperature-Sensitive Liposomes

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Published on: March 3, 2020

A simple and cost effective method for preparing FL and LG solutions.

Deborah Awisi Gyau¹, Carolyn G Begley¹, J Daniel Nelson²

¹Indiana University School of Optometry, Bloomington, IN, USA.

The Ocular Surface

|November 7, 2017

Summary

This study presents a simple method to prepare clinical concentrations of fluorescein (FL) and lissamine green (LG) dyes by soaking dye strips in saline. The developed technique offers a reliable and inexpensive way to achieve accurate dye concentrations for research applications.

Keywords:

Conjunctiva Cornea Lissamine green Sodium fluorescein Staining

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Area of Science:

Ophthalmology
Clinical Trials
Medical Diagnostics

Background:

Accurate dye concentrations are crucial for clinical trials and diagnostic procedures.
Existing methods for preparing fluorescein (FL) and lissamine green (LG) may lack clinical feasibility or cost-effectiveness.

Purpose of the Study:

To develop a clinically feasible, reliable, and inexpensive method for preparing 2% fluorescein (FL) and 1% lissamine green (LG) dye solutions.
To optimize the process of soaking commercially available dye-impregnated strips in saline to achieve target concentrations.

Main Methods:

Established calibration curves relating known dye concentrations to fluorescence (FL) and absorbance (LG).
Determined optimal soaking times and the number of dye strips (3 FL or LG strips soaked for 5 minutes) through preliminary testing.
Validated the method using centrifuge tubes for ease of clinical application.

Main Results:

Soaking 3 FL or 3 LG strips for 5 minutes in saline yielded average concentrations of 2.0% FL and 0.93% LG.
Final testing confirmed consistent FL concentrations (1.99%) across various soaking times and dye lots.
Lissamine green (LG) results showed higher variability (0.80%), with significant differences noted among dye lots and soaking times (p < 0.05).

Conclusions:

A simple, reliable, and cost-effective method for preparing clinical concentrations of FL and LG dyes was successfully developed.
The method involves soaking three dye-impregnated strips in saline, yielding concentrations close to the recommended 2% FL and 1% LG.
While fluorescein concentrations were highly consistent, lissamine green exhibited greater variability, requiring careful consideration in clinical applications.