TABLE 1.

Oxidation of xanthophylls by postmitochondrial fraction of mouse liver

Substrate	Complete Incubation		Minus NAD+ Control
	Product (μM)	Residual Substrate(μM)	Residual Substrate (μM)
β-Cryptoxanthin	β,ε-Caroten-3′-one
	0.274 ± 0.007	3.75 ± 0.08	13.74 ± 0.12
Lutein	3′-Hydroxy-ε,ε-caroten-3-one
	0.700 ± 0.017	7.17 ± 0.55	14.03 ± 0.30
Zeaxanthin	3-Hydroxy-β,ε-caroten-3′-one
	0.170 ± 0.006	3.13 ± 0.25	13.78 ± 0.13
3-Hydroxy-β,ε-caroten-3′-one	ε,ε-Carotene-3,3′-dione
	0.408 ± 0.019	9.66 ± 0.31	15.16 ± 0.23
Lactucaxanthin	3′-Hydroxy-ε,ε-caroten-3-one
	0.014 ± 0.007	16.53 ± 1.43	13.13 ± 0.33
3′-Hydroxy-ε,ε-caroten-3-one	ε,ε-Carotene-3,3′-dione
	0.011 ± 0.003	17.30 ± 0.31	16.38 ± 0.13

Xanthophyll (20 μM) was incubated at 37°C for 60 min in the standard reaction mixture. Values are mean ± SD of triplicate incubations.