3D model (JSmol)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
δ-Carotene or ε,ψ-carotene is a form of carotene with an ε-ring at one end, and the other uncyclized, labelled ψ (psi). It is an intermediate synthesis product in some photosynthetic plants between lycopene and α-carotene (β,ε-carotene) or ε-carotene (ε,ε-carotene). δ-Carotene is fat soluble. Delta-carotene contains an alpha-ionone instead of a beta-ionone ring; this conversion is carried out by the gene Del which shifts the position of the double bond in the ring structure. The formation delta-carotene under the presence of the Del gene is sensitive to high temperatures.
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- Tomes ML (August 1969). "Delta-carotene in the tomato". Genetics. 62 (4): 769–80. PMC 1212314. PMID 17248458.
- Tomes ML (June 1967). "The competitive effect of the Beta- and delta-carotene genes on alpha- or Beta-ionone ring formation in the tomato". Genetics. 56 (2): 227–32. PMC 1211498. PMID 17248383.