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Related Experiment Video

Updated: Dec 6, 2025

Author Spotlight: Advancing Tear Fluid Analysis Using a Standardized Protocol for Proteomics Research

Author Spotlight: Advancing Tear Fluid Analysis Using a Standardized Protocol for Proteomics Research

Published on: December 1, 2023

Quantifying Sample Collection and Processing Impacts on Fiber-Based Tear Fluid Chemical Analysis.

Anis Barmada¹, Scott A Shippy^1,2

¹Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois, United States.

Translational Vision Science & Technology

|October 7, 2020

Summary

Phenol red thread collection methods significantly alter tear analysis, leading to inaccurate primary amine quantification. Evaluating these collection impacts is crucial for standardizing tear fluid research and clinical care.

Keywords:

fiber ocular surface phenol red thread sample processing tear collection/analysis

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Bead Based Multiplex Assay for Analysis of Tear Cytokine Profiles

Bead Based Multiplex Assay for Analysis of Tear Cytokine Profiles

Published on: October 13, 2017

Area of Science:

Ophthalmology
Analytical Chemistry
Biomedical Research

Background:

Noninvasive tear fluid analysis commonly uses absorbent materials for sample collection and processing.
The influence of these collection and processing techniques on tear chemical analysis is not well understood.

Purpose of the Study:

To quantify the impact of phenol red thread fiber-based tear sample collection and processing on primary amine content.

Main Methods:

Human tears were collected using phenol red thread placed on the palpebral conjunctiva.
Tear samples on the thread were processed via elution or extraction.
Capillary electrophoresis with fluorescence detection was used for analysis and quantitation.

Main Results:

Processing methods distinctly impacted tear analysis.
Primary amines adsorbed onto the thread showed chromatographic partitioning, making portions unrepresentative.
On-thread processing led to significant overestimation of small molecule concentrations, with accuracy varying by sample volume.

Conclusions:

Absorption-based tear fluid collection and processing significantly alter chemical content analysis.
Regular evaluation of these methods is necessary to standardize results across studies.
Potential inconsistencies and inaccuracies in tear analyses are widespread in published literature and clinical practice.