provitamin

Thân thiện

A carrot contains the provitamin beta-carotene.

Definition

Noun: A provitamin is a biologically inactive compound that the body can convert into an active vitamin. It is a precursor substance found in some foods.

Usage

A provitamin is a dietary compound. The body metabolizes it to produce an essential vitamin. The term is most commonly used in nutritional science and biochemistry.

Examples

• Carotene is a provitamin that the body converts into vitamin A.
• Ergosterol is a provitamin found in plants and fungi; it becomes vitamin D2 when exposed to ultraviolet light.
• The nutritional label indicates the food contains provitamin A carotenoids.

Advanced Usage

• Scientific Context: In research, specific provitamins are studied for their conversion efficiency and bioavailability. For example, "The study compared the bioavailability of different provitamin A compounds."
• Industrial Context: Provitamins are sometimes added to food products for fortification. For instance, "The margarine is fortified with provitamin D."

Variants and Related Words

• Precursor: A more general term for any substance from which another, usually more active or mature, substance is formed.
• Vitamin: The active, essential nutrient produced from the provitamin.
• Carotenoid: A class of pigments, some of which (like beta-carotene) are provitamins.

Synonyms

• Vitamin precursor
• Pro-vitamin (alternative spelling)

Different Meanings

The term "provitamin" has a single, specific meaning in biochemistry and nutrition. It does not have other common definitions.

Notes

• The prefix "pro-" in this context means "before" or "precursor to."
• Not all vitamin precursors are called provitamins; the term is typically reserved for well-defined, direct precursors like beta-carotene (to vitamin A) or 7-dehydrocholesterol (to vitamin D3).

Học thuật

Noun

1. vitamin precursor; a substance that is converted into a vitamin in animal tissues