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. 2015 Nov 4;10(11):e0142074. doi: 10.1371/journal.pone.0142074

Table 2. Carotenoids compounds detected in narcissus cultivars by HPLC-APCI-MS/MS.

peak ^a	tentative compound	tR ^b (min)	λmax (nm)	%III/II	%A_B/A_II	[M+H]⁺ (m/z)	MS/MS fragment ions(+)(m/z)	ID ^d
C1	all-trans-neoxanthin	8.48	417,441,470	n.c. ^c	n.c.	601	583[M+H-18]+, 565[M+H-18-18]+, 547[M+H-18-18-18] +, 509[M+H-92] +, 491, 393	std
C2	9-cis-neoxanthin	9.88	327,416,438,469	76	8	601	583[M+H-18] ⁺, 565[M+H-18-18] ⁺, 547[M+H-18-18-18] ⁺, 509[M+H-92], 393	ref 17,18,20,21
C3	all-trans-violaxanthin	14.67	415,439,468	n.c.	n.c.	601	583[M+H-18] ⁺, 565[M+H-18-18] ⁺, 509[M+H-92] ⁺, 491[M+H-92-18], 221	std
C4	all-trans-antheraxanthin	15.91	420,444,474	59	0	585	567[M+H-18] ⁺, 549[M+H-18-18] ⁺, 529[M+H-56] ⁺, 221	ref 18,24
C5	9-cis- violaxanthin	17.78	326,413,436.466	75	11	601	583[M+H-18] ⁺, 565[M+H-18-18] ⁺, 509[M+H-92] ⁺, 221	ref 18,21
C6	all-trans-lutein	18.56	420,444,472	n.c.	n.c.	569	551[M+H-18] ⁺, 533[M+H-18-18] ⁺, 495[M+H-18-56]⁺, 477[M+H-92] ⁺	std
C7	all-trans-zeaxanthin	20.76	423,450,476	45	0	569	551[M+H-18] ⁺, 533[M+H-18-18] ⁺	ref 18,22,24
C8	all-trans-β-cryptoxanthin	21.12	421,448,475	n.c.	n.c.	553	535[M+H-18] ⁺, 495, 461[M+H-92] ⁺	std
C9	all-trans-β-carotene	27.80	421,450,478	n.c.	n.c.	537	444[M-92] ⁺	std
C10	9-cis-β-carotene	29.76	340,420,447,475	27	19	537	444[M-92] ⁺	ref 17,21,22

^aNumbered according to Fig 3.

^btR: retention time.

^cn.c.: not calculated.

^dID: std, standard compound; ref, reference.