Table 4.

Pigment compounds identified in the extracts from S. atropurpurea L. stem by HPLC-PDA-APCI/MS.

N°	Rt (min)	λ max(nm)	[M + H]+ m/z	[M − H]- m/z	Compounds	Formula	Ref
1	3.3	268	409	-	4,4′-diapophytoene	C30H48	[10]
2	3.5	530, 604, 658,	617	-	Chlorophyllide a	C35H34MgN4O5	[11]
3	6.4	281, 314, 421,434, 658	613	-	Chlorophyll c	C35H32MgN4O5	-
4	7.3	229, 279, 407, 504, 667	696, 609	712, 607	Unknown	-	-
5	8.1	238, 266, 401, 498, 667	625	-	Actinioerythrin	C40H48O6	[12]
6	9.05	232, 322, 407, 504, 666	637, 619	635, 389	Unknown	-	-
7	10.6	232, 331, 372, 437, 657	607	605	Pheophorbide b	C35H34 N4O6	[11,13]
8	11.6	415, 437, 464	551	568	Isomer lutein	C40H56O2	[14]
9	12.3	274, 340, 425, 507, 658	593	592	Pheophorbide a	C35H36N4O5	[15]
10	14.0	422, 444, 473	551	568	Lutein	C40H56O2	[16]
11	16.7	231, 409, 448, 467, 668	622	620	Unknown	-	-
12	19.0	416, 438, 467,	551	-	Echinenone	C40H54O	[15]
13	23.5	233, 269, 415, 438, 468	873, 765, 654	763, 652	Unknown	-	-
14	26.4	409, 507, 667	535	534	Torulene	C40H54	[17]
15	33.5	297, 326, 370, 436, 661	893	-	Chlorophyll a	C55H72MgN4O5	[11]
16	37.7	227, 279, 407, 504, 667	908, 887, 682	886, 680	Chlorophyll b	C55H70MgN4O6	[11,13]
18 17	39.9	282, 279, 407, 499, 504, 667	903	902	Unknown	-	-
18	43.14	331, 373, 437, 529, 661	885, 827	884, 826	Pheophytin b	C55H72N4O6	[11]
19	45.77	331, 371, 432, 441, 657	885, 827	884, 826	Pheophytin b	C55H72N4O6	[11]
20	47.5	276, 408, 507, 538, 667	-	870	Pheophytin a	C55H74N4O5	[11]
21	48.9	275, 340, 425, 507, 658	872	870	Pheophytin a	C55H74N4O5	[11]
22	53.4	428, 452, 478	537	-	β-carotene	C40H56	[15,18]
23	55. 8	417, 444, 472	537	-	9-Z-β -carotene	C40H56	[15,18]
24	58.15	412, 436, 507, 544, 663	827	826	Unknown	-	-

R_t: retention time; [M + H]⁺: protonated molecule; λ_max: ultraviolet absorption maxima.