Table 1 UV/vis spectra and characteristic ions of carotenoids from six maturation stages of loquat fruits, obtained by HPLC-PDA-MS
Peak | Carotenoid | tR (min) | λmax (nm) | %III/II | %Ab/II | [M + H] + m/z | HPLC/APCI (+)-MSn experiment m/z (% base peak) | Exact mass | Score | Error (ppm) | Molecular formula |
|---|---|---|---|---|---|---|---|---|---|---|---|
1 | All-trans-neoxanthin | 14.1 | 412,436,462 | 70 | 0 | 601 (40), 583 (75), 565 (100) | MS2 [601]: 583 (100), 565 (47), 547 (9), 509 (6),491 (5), 221 (41) MS3 [601˃583]: 565 (48), 547 (14) | 600.4188 | 91.88 | -2.69 | C40H56O4 |
2 | All-trans-neochrome | 14.6 | 397,420,448 | 90 | 0 | 601 (42), 583 (100), 565 (43) | MS2 [601]: 583 (100), 565 (57), MS3 [601˃583]:221 (62) | 600.4178 | 96.70 | -0.89 | C40H56O4 |
3 | All-trans-violaxanthin | 14.8 | 414,438,470 | 75 | 0 | 601 (85), 583 (100), 565 (20) | MS2 [601]: 583 (100), 565 (12), 509 (5), 221 (24) | 600.4178 | C40H56O4 | ||
4 | Not identified | 16.0 | 466 | 0 | 0 | 455 (100) | MS2 [455]: 437 (80), 399 (34) | 455.3324 | 93.60 | -2.61 | C33H43O |
5 | Not identified | 16.2 | 396,420,448 | 75 | 0 | 601 (60) | MS2 [601]: 583 (95), 221 (100 | ||||
6 | Not identified | 16.4 | Not detected | -- | -- | 601 (64) | MS2 [601]: 583 (90), 565 (40), 491 (9), 221 (100) MS3 [601˃583]:565 (100),221 (60) | ||||
7 | β- Diepoxy-cryptoxanthin | 16.7 | 412, 436,466 | 72 | 0 | 585 (100) | MS2 [585]: 567 (45), 549 (80), 493 (37), 221 (100), 205 (10) | 584.4184 | 95.60 | -2.52 | C40H56O3 |
8 | Cis-violaxanthin | 17.3 | 324,410, 434,464 | 60 | 8 | 601 (81), 487 (100) | MS2 [601]: 583 (100), 565 (42), 509 (6),491 (23), 221 (51) MS2 [487]: 469 (100) | ||||
9 | Not identified | 17.8 | 378,400,424 | 100 | 0 | 601 (100), 351 (98) | MS2 [601]: 583 (100), 565 (13), 509 (15), 491 (14),393 (40),221 (41) MS2 [351]: 333 (16) | ||||
10 | All-trans-lutein | 18.2 | 420,444,472 | 48 | 0 | 569 (5), 551 (100) | MS2[551]: 533 (51), 495 (24), 477 (35) | 568.427 | 99.30 | -0.226 | C40H56O2 |
11 | Not identified | 18.5 | 444 | 0 | 0 | 454 (100) | MS2[454]: 436 (7), 393 (100) | ||||
12 | Not identified | 18.9 | 448 | 0 | 0 | 473 (100),539 (80) | MS2[539]: 521 (100) | ||||
13 | Not identified | 19.0 | 454 | 0 | 0 | 473 (100), 454 (14) | MS2 [473]: 455 (43), 205 (100) MS2 [454]: 436 (31), 393 (36) | ||||
14 | Not identified | 19.3 | 423,438,474 | 60 | 551 (100) | MS2 [551]: 533 (67), 477 (55) | |||||
15 | Not identified | 19.4 | 448 | 0 | 0 | 439 (93), 403 (100) | MS2 [439]:403 (14) | ||||
16 | Not identified | 19.6 | 434 | 0 | 0 | 391 (100) | MS2 [391]:373 (14) | ||||
17 | 5,6-Epoxy-β-cryptoxanthin | 19.8 | 416,438,466 | 34 | 0 | 569 (17),551 (54) | MS2 [551]: 533 (20), 205 (21) | 568.428 | 75.56 | -5.07 | C40H56O2 |
18 | 5′,6′-Epoxy-β-cryptoxanthin | 19.9 | 419,441,470 | 52 | 0 | 569 (30), 551 (100) | MS2 [551]: 533 (100), 577 (14), 459 (30), 221 (13) | 568.428 | 89.42 | -2.11 | C40H56O2 |
19 | Cis-lutein | 20 | 326,412,436,462 | 52 | 20 | 569 (18), 551 (100) | MS2 [551]: 533 (100), 221 (11) | 568.428 | 77.7 | 3.57 | C40H56O2 |
32 | β- Diepoxy-cryptoxanthin | 20.2 | 416,440, 470 | 87 | 0 | 585 (100) | MS2 [583]: 567 (49), 549 (10) 221 (31), 205 (29) | ||||
20 | Not identified | 20.4 | 446 (100) 417 (90) | MS2 [417]:399 (100) MS2 [446]:219 (100) | |||||||
21 | β-Apo-8′-carotenal (IS) | 21.0 | 450 | 0 | 0 | 417 (100) | MS2 [417]:399 (25), 389 (32), 361 (39), 325 (100), 293 (97), 157 (88), 119 (16) | 416.3079 | 98.23 | -2.15 | C30H40O |
22 | Citranaxanthin | 21.6 | 470 | 0 | 0 | 457 (100) | MS2 [457]:439 (90), 399 (49) | 455.3324 | 97.23 | -1.25 | C33H44O |
23 | Not identified | 22.4 | 470 | 696 (100) | MS2 [696]: 534 (34), 516 (100) | ||||||
24 | Not identified | 22.8 | 420,444,470 | 31 | 0 | 537 (58) | MS2 [537]: 467 (16), 444 (51), 365 (100) | ||||
25 | Not identified | 23.3 | Not detected | 537 (28),430 (100) | MS2 [537]:444 (100),481 (24) 413 (90) | ||||||
26 | All-trans-β-cryptoxanthin | 24.0 | 420, 448,472 | 24 | 0 | 553 (100) | MS2 [553]:535 (100), 497 (41),461 (10) | ||||
27 | Not identified | 24.5 | 664 (100) | MS2 [664]: 551 (100), 496 (55) | |||||||
28 | Not identified | 24.9 | 453, 479 | 0 | 0 | 551 (100) | MS2 [551]: 534 (15), 361 (100) | ||||
29 | Phytoene + not identified 14 | 28.0 | 545 (95), 553 (100) | MS2 [545]:489 (10),395 (100) MS2 [553]:535 (12) | |||||||
30 | 5,8-epoxy-β-carotene | 28.4 | 405, 424, 450 | 26 | 0 | 553 (100) | MS2 [553]:535 (55),461 (35), 221 (64),205 (17) | ||||
31 | All-trans-β-carotene | 36.5 | 424, 446,470 | 18 | 0 | 537 | MS2 [537]:444 (100) |