TABLE 2.

Experimental and predicted Raman scattering peaks for all-trans-8′-apocarotenol and all-trans-retinal, as well as the di-cis intermediate and 13-cis-retinal product proposed to be generated during ACO-mediated oxidative carotenoid cleavage

Compounda	Experimental peak wave number	Calculated peak wave numberb
	cm−1
All-trans-8′-apocarotenol	1532	1526
13,14′-Di-cis-8′-apocarotenol	NDc	1552
All-trans-retinal	1580	1581
13-cis-Retinal	1555	1550
8′-Hydroxy-15′-apocarotenal	1599	1619d

^a See Fig. 1 for chemical structures.

^b As calculated by Gaussian 03 (45).

^c ND, not determined.

^d Calculated signals for this all-trans-apocarotenoid product and its cis-isomer are indistinguishable.