Table 2.

HPLC retention times and mass fragmentation patterns of the reference compounds (1–16).

Compounds	Retention Time (min)	m/z
Vescalagin (1)	8.0	933 a, 915, 613, 301
Castalagin (2)	13.5	933 a, 915, 613, 301
Grandinin (3)	5.6	1065 a, 915, 613, 301
Roburin E (4)	7.1	1065 a, 915, 613, 301
Roburin A (5)	3.9	1849, 933, 924 a, 915, 301
Roburin D (6)	5.8	1849, 933, 924 a, 915, 301
Roburin B (7)	3.9	1981, 1065, 990 a, 915, 301
Roburin C (8)	4.2	1981, 1065, 990 a, 915, 301
β-1-O-ethylvescalagin (9)	21.2	961 a, 915, 480, 301
Whiskey tannin B1 (10)	24.0 and 26.4	977 a, 933, 675, 631, 301
Whiskey tannin B2 (11)	24.0 and 26.4	977 a, 933, 675, 631, 301
Brandy tannin B (12)	32.5	1005 a, 703, 301
β-1-O-ethylvescalin (13)	21.4	659 a
Whiskey tannin A1 (14)	4.9 and 8.6	675 a
Whiskey tannin A2 (15)	4.9 and 8.6	675 a
Brandy tannin A (16)	27.7	703 a

^a Ion used for the quantification.