TABLE 2.

UV-Vis absorption maxima, high-resolution MALDI m/z values, deduced chemical formulae, and presumptive identifications of carotenoids purified from strains VUG-A141a (carotenoids 1 to 5) and VUG-A42aa (carotenoids 6 to 9)^a

Carotenoid	UV-Vis maximum(a) (nm)	m/z	Deduced chemical formula	Presumptive identity
1	478	ND	ND	Unknown
2	478	ND	ND	Unknown
3	484, 502, sh	760.45449	C46H64O9	Hexosyl-2′-hydroxyflexixanthin
4	480, 502, sh	730.44392	C45H62O8	Pentosyl-2′-hydroxyflexixanthin
5	486, 502, sh	621.39143 (598.4)	C40H54O4Na C40H54O4	2′-Hydroxyflexixanthin
6	484, 502, sh	635.40708 (612.4)	C41H56O4Na C41H56O4	Methyl-2′-hydroxyflexixanthin
7	480, 502, sh	596.42240	C41H56O3	Methyl-3-deoxy-2′-hydroxyflexixanthin, methyl-flexixanthin or methyl-1′,2′-dihydro-2,2′-dihydroxy-3′,4′-didehydro-4-keto-γ-carotene
8	446, 472, 502	568.42748	C40H56O2	Plectaniaxanthin, saproxanthin or 1′,2′-dihydro-2,2′-dihydroxy-3′,4′-didehydro-γ-carotene
9	446, 470, 500	582.44313	C41H58O2	Methyl-plectaniaxanthin, methyl-saproxanthin or methyl-1′,2′-dihydro-2,2′-dihydroxy-3′,4′-didehydro-γ-carotene

^aThe high-resolution electrospray ionization m/z values of carotenoids 5 and 6 are given as sodiated derivatives, with their nonsodiated, low-resolution m/z values in parentheses. ND, not determined, due to low abundance (Table 1); sh, shoulder peak.