Abstract
A series of oxygenated carotenoids has been isolated from tomatoes. Two of these compounds have been identified, by comparison of their chromatographic and spectroscopic properties with those of semisynthetic samples, as epoxides of lycopene (1,2-epoxy-1,2-dihydro-ψ,ψ-carotene and 5,6-epoxy-5,6-dihydro-ψ,ψ-carotene). The other related compounds have been identified by their chromatographic, spectroscopic and chemical properties as mutatochrome (5,8-epoxy-5,8-dihydro-β,β-carotene) and epoxides of phytoene (1,2-epoxy-1,2,7,8,11,12,7′,8′,11′,12′-decahydro-ψ, ψ-carotene), phytofluene (1,2-epoxy-1,2,7,8, 11,12,7′,8′-octahydro-ψ,ψ-carotene and 1,2-epoxy-1,2,7,8,7′,8′,11′,12′-octahydro-ψ,ψ-carotene) and ξ-carotene (1,2-epoxy-1,2,7,8,7′,8′-hexahydro-ψ,ψ-carotene). The presence in tomatoes of apo-6′-lycopenal (6′-apo-ψ-caroten-6′-al), 8′-apo-lycopenal (8′-apo-ψ-caroten-8′-al) and lycoxanthin (ψ,ψ-caroten-16-ol) has been confirmed by comparison with authentic samples.
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