Table 1 Details of molecular ion peaks and the product ions obtained during MS/MS (MS2) measurements of piperine (M ₁ ) and its analogues (M _2–18 )

1

286[Mn + H]⁺, 308[ Mn + Na]⁺ and 593[2 Mn + Na]⁺

2

290[Mn + H]⁺, 312[2Mn + Na]⁺ and 601[2 Mn + Na]⁺

3

272[Mn + H]⁺, 294[Mn + Na]⁺ and 565 [2 Mn + Na]⁺

4

248[Mn + H]⁺, 270[Mn + Na]⁺ , 517 [2 Mn + Na]⁺

5

288[Mn + H]⁺, 310[Mn + Na]⁺ , 597 [2 Mn + Na]⁺

6

272[Mn + H]⁺, 294[Mn + Na]⁺ , 565 [2 Mn + Na]⁺

7

300[Mn + H]⁺, 322[Mn + Na]⁺ , 621 [2 Mn + Na]⁺

8

286[Mn + H]⁺,308[Mn + Na] ⁺ , 593 [2 Mn + Na]⁺

9

292[Mn + H]⁺, 314[Mn + Na]⁺ , 605[2 Mn + Na]⁺

10

260[Mn + H]⁺, 282[Mn + Na]⁺ , 541 [2 Mn + Na]⁺

11

274[Mn + H]⁺, 296[Mn + Na]⁺ , 569 [2 Mn + Na]⁺

12

292[Mn + H]⁺, 314[Mn + Na]⁺ , 605 [2 M + Na]⁺

13

302[Mn + H]⁺, 324[Mn + Na]⁺ , 625 [2 Mn + Na]⁺

14

278[Mn + H]⁺, 300[Mn + Na]⁺ , 577[2 Mn+ Na]⁺

15

306[Mn + H]⁺ , 328[Mn + Na]⁺ , 633[2 Mn + Na]⁺

16

276[Mn + H]⁺, 298[Mn + Na]⁺ , 573[2 Mn + Na]⁺

17

272[Mn + H]⁺, 294[Mn + Na]⁺ , 565 [2 M + Na]⁺

18

332[Mn + H]⁺, 354[Mn + Na]⁺, 685[2 Mn + Na]⁺