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. 2021 Jan 6;19(1):21. doi: 10.3390/md19010021

Table 2.

HPLC-MS parameters of quinonoid pigments of sea urchins.

No Rt, min m/z [M − H] λmax, nm Formula Compound
1 5.56 253 264, 350, 478 C10H6O8 Spinochrome E
2 6.67 252 275, 370, 473 C10H7NO7 Spinamine E
3 7.09 237 251, 327, 463 C10H6O7 Spinochrome D
4 7.45 221 265, 320, 390, 471 C10H6O6 Spinochrome B
5 7.53 299 256, 321, 391 C12H12O9 Dehydroechinochrome
6 8.11 535 260, 333, 394, 473 - Not identified
7 8.40 221 270, 315, 515, 559 C10H6O6 Mompain
8 8.49 262 272, 319, 511 C12H9NO6 Acetylaminotrihydroxynaphthoquinone
9 8.86 483 264, 325, 452 C22H12O13 Mirabiquinone
10 9.77 279 290, 456 C12H8O8 Spinochrome C
11 9.83 483 265, 316, 470 C22H12O13 7,7′-Anhydroethylidene-6,6′-bis(2,3,7-trihydroxynaphthazarin)
12 10.14 499 264, 304, 408, 469, 532 - Not identified
13 10.40 247 219, 268, 299 C12H8O6 2-Acetyl-3-hydroxynaphthazarin
14 10.42 501 254, 339, 471 C22H14O14 Ethylidene-3,3′-bis(2,6,7-trihydroxynaphthazarin)
15 10.46 765 217, 273, 344, 473 - Not identified
16 10.62 265 254, 338, 471 C12H10O7 Echinochrome A
17 10.64 263 266, 312, 508 C12H8O7 Spinochrome A
18 11.06 527 260, 335, 495, 542 - Not identified
19 11.35 264 278, 352, 477 C12H11NO6 Echinamine A
20 11.56 279 252, 330, 491, 525 C13H12O7 7-Ethyl-3,5,6,8-tetrahydroxy-2-methoxy-1,4-naphthoquinone
21 11.66 264 274, 352, 477 C12H11NO6 Echinamine B
22 11.73 279 256, 332, 474, 497, 538 C13H12O7 7-Ethyl-2,5,6,8-tetrahydroxy-3-methoxy-1,4-naphthoquinone