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Two major carotenoids of the stick insect were reinvestigated and shown to be β,β-caroten-2-ol and β,β-carotene-2,2′-diol and not isocryptoxanthin (β,β-caroten-4-ol) and isozeaxanthin (β,β-carotene-4,4′-diol). Both pigments are esterified with fatty acids. The identification is based on co-chromatography with authentic 2-, 3-and 4-isomers of the mono-and dihydroxy pigment, mass spectra, and chemical behaviour. In acid solution β-β-carotene-2,2′-diol is specifically dehydro­ genated and rearranged to ketones with retro structures in analogy to the reaction of β,β-caroten-2-ol as recently reported. The final product of the diol is 4,5-dihydro-4,5′-retro-β,β-carotene-2,2′-dione.

Identification of β,β-Caroten-2-ol and β,β-Carotene-2,2′-diol in the Stick Insect, Carausius morosus Br.; a Reinvestigation Study