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Related Experiment Video

Updated: Jun 19, 2026

Quantitative Analysis of Dietary Vitamin A Metabolites in Murine Ocular and Non-Ocular Tissues Using High-Performance Liquid Chromatography

Quantitative Analysis of Dietary Vitamin A Metabolites in Murine Ocular and Non-Ocular Tissues Using High-Performance Liquid Chromatography

Published on: December 27, 2024

VITAMIN A IN EYE TISSUES.

¹Kaiser Wilhelm-Institut für Zellphysiologie, Berlin-Dahlem, Germany, and the Chemical Institute of the University of Zürich, Zürich, Switzerland.

The Journal of General Physiology

|October 30, 2009

Summary

This summary is machine-generated.

Vitamin A was identified in the retinas and pigment layers of various animals, including mammals and frogs. Its presence was confirmed through absorption spectroscopy, chemical tests, and biological activity assays.

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Methodology for Studying Interactions of Vitamin A Membrane Receptors and Opsin Protein with their Ligands in Generating the Retinylidene Protein

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Published on: October 4, 2024

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Last Updated: Jun 19, 2026

Quantitative Analysis of Dietary Vitamin A Metabolites in Murine Ocular and Non-Ocular Tissues Using High-Performance Liquid Chromatography

Quantitative Analysis of Dietary Vitamin A Metabolites in Murine Ocular and Non-Ocular Tissues Using High-Performance Liquid Chromatography

Published on: December 27, 2024

Methodology for Studying Interactions of Vitamin A Membrane Receptors and Opsin Protein with their Ligands in Generating the Retinylidene Protein

Methodology for Studying Interactions of Vitamin A Membrane Receptors and Opsin Protein with their Ligands in Generating the Retinylidene Protein

Published on: October 4, 2024

Area of Science:

Biochemistry
Ophthalmology
Comparative Anatomy

Background:

Vitamin A is crucial for vision and growth.
Previous research indicated Vitamin A's presence in ocular tissues.

Purpose of the Study:

To identify and quantify Vitamin A in the ocular tissues of different animal species.
To confirm the presence of Vitamin A using multiple analytical methods.

Main Methods:

Spectrophotometry to determine specific absorption at 328 nm.
Chemical tests, including the antimony trichloride reaction (blue color at 620 nm).
Assays for anti-xerophthalmic and growth-promoting biological activities.

Main Results:

Vitamin A was detected in the retinas and pigment epithelia/choroid of frogs, pigs, sheep, and cattle.
Quantification revealed significant concentrations: ~400 µg/g in frog retinas, ~2 mg/g in frog pigmented layers, and ~22 µg/g in mammalian retinas.
No other carotenoids, except possibly hepaxanthin, were found in mammalian tissues.

Conclusions:

Vitamin A is a significant component of ocular tissues in both amphibians and mammals.
The study provides quantitative data on Vitamin A distribution in these tissues.
Multiple lines of evidence confirm the identification and presence of Vitamin A.