vitamin A2

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Definition

Noun: A viscous alcohol that is less active in mammals than vitamin A1. It is a specific form of vitamin A, also known as dehydroretinol, found in some freshwater fish and other animal tissues.

Usage

This is a scientific and biochemical term. It is used to specify a particular chemical form of vitamin A, distinguishing it from the more common and active form, vitamin A1 (retinol).

Examples
  • Noun:
    • The liver of this freshwater fish is a rich source of vitamin A2.
    • In their study, the researchers compared the biological activity of vitamin A2 to that of retinol.
    • The chemical structure of vitamin A2 differs from vitamin A1 by one double bond.
Advanced Usage
  • Biochemical Context: The term is primarily used in nutritional science, biochemistry, and comparative physiology to discuss the presence and function of different vitamin A forms in various species.
    • The visual pigments in some amphibians are based on vitamin A2 rather than A1.
Variants and Related Words
  • Dehydroretinol: The systematic chemical name for vitamin A2.
  • Vitamin A1 (Retinol): The more common and active form of vitamin A in mammals, often contrasted with vitamin A2.
  • Retinoid: The broader class of chemical compounds related to or derived from vitamin A, which includes both A1 and A2 forms.
Synonyms
  • Dehydroretinol (This is the direct chemical synonym).
Notes
  • This is a highly specialized term. In general health, nutrition, and everyday contexts, the simple term "vitamin A" almost always refers to vitamin A1 (retinol) and its precursors (like beta-carotene). The distinction between A1 and A2 is relevant mainly in specific scientific discussions.
Noun
  1. a viscous alcohol that is less active in mammals than is vitamin A1

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