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See retinal2.


(ˈrɛtɪˌniːn) or


(Biochemistry) the aldehyde form of the polyene retinol (vitamin A) that associates with the protein opsin to form the visual purple pigment rhodopsin
[C20: from retina + -ene]


(ˈrɛt n əl)

of or pertaining to the retina of the eye.


(ˈrɛt nˌæl, -ˌɔl)

an orange visual pigment, C20H28O, the active component of rhodopsin and iodopsin, that is liberated upon the absorption of light in the vision cycle.
[1940–45; retin (a) + -al3]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.retinene - either of two yellow to red retinal pigments formed from rhodopsin by the action of light
pigment - dry coloring material (especially a powder to be mixed with a liquid to produce paint, etc.)
retinal purple, rhodopsin, visual purple - a red photopigment in the retinal rods of vertebrates; dissociates into retinene by light
References in periodicals archive ?
Many previous studies have shown that alcohol dehydrogenase 1 (ADH1) is a major enzyme in achieving the oxidation from retinol to retinaldehyde in mouse experiments [5].
Retinal, also named retinaldehyde, is a polyene chromophore and is the basis for animal vision allowing the conversion of light into metabolic energy.
25, uses retinaldehyde to reduce the excess pigment in the skin for a lot less money
Le melanyde pour depigmenter, le retinaldehyde, un derive de la vitamine A, pour l'effet depigmentant, et le pre-tocopheryl, une forme stable de la vitamine E, un anti-oxydant puissant.
A key step in retinoid metabolism occurs with help from an enzyme called retinaldehyde dehydrogenase 1, or Aldh1a1.
atRA is a pleiotropic, paracrine or autocrine signaling molecule produced from vitamin A through oxidative reactions carried out by the cytosolic retinaldehyde dehydrogenases RALDHl, RALDH2, and RALDH3 (Duester 2008).
There is a lot we know about the three active forms of vitamin A: retinaldehyde is required for rhodopsin formation and vision; retinoic acid is an important signalling molecule that acts to regulate the expression of numerous genes, several of which are involved in growth and differentiation; retinol as the precursor of both other forms, plays many roles including being vital to normal functioning of the immune system.
Biomarkers whose expression is altered in cases of endometrial hyperplasia or cancer such as progesterone receptor, insulin-like growth factor I, retinaldehyde dehydrogenase type II, and secreted frizzled-related protein 4, seem to be promising to use as early-stage tumor markers.