. 2021 Apr 1;26(7):2011. doi: 10.3390/molecules26072011

Table 2.

Retention time, maximum absorbance wavelengths and main fragments of non-anthocyanin phenolic compounds tentatively assigned in AHE by HPLC-DAD-ESI-MSⁿ, in negative ionization mode. The content of phenolic compounds was determined in mg/100 g dw and expressed as mean ± SD.

Peak	Rt (Min)	λ_max (nm)	[M-H]^- (m/z)	MS² Fragments (m/z)	MS³ fragments (m/z)	Proposed Identification	Content (mg/100 g dw)
Hydroxybenzoic acids
1	18.2	260, 290	153	109	-	Protocatechuic acid	9.4 ± 0.9 ^a
Proanthocyanidins
2	22.5	278	865	739, 713, 695, 577, 425, 407	-	Proanthocyanidin trimer	6.3 ± 0.1 ^b
3	23.5	280	577	559, 451, 425, 407, 289	-	Proanthocyanidin dimer	25.7 ± 0.4 ^b
						Total	32.0 ± 0.5 ^b
Flavonoids
8	48.9	277, 343	593	575, 503, 473, 383, 353	383, 353	Apigenin-6,8-di-C-hexoside (vicenin-2)	4.63 ± 0.2 ^c
9	49.6	280, 340	579	561, 519, 489, 459, 429	399, 369	Luteolin-6-C-pentoside-8-C-hexoside isomer 1	1.61 ± 0.01 ^c
10	50.6	280, 340	579	561, 519, 489, 459, 429	399, 369	Luteolin-6-C-pentoside-8-C-hexoside isomer 2	2.47 ± 0.02 ^c
11	51.4	280, 340	579	561, 519, 489, 459, 429	399, 369	Luteolin-6-C-hexoside-8-C-pentoside	1.40 ± 0.04 ^c
12	54.4	280, 330	563	545, 503, 473, 443, 383, 353	383, 353	Apigenin-6-C-pentoside-8-C-hexoside	4.1 ± 0.1 ^c
13	55.8	283, 340	449	287, 269, 151	241, 225, 197, 181, 151	Taxifolin deoxyhexose	33.1 ± 0.5 ^c
14	56.9	270, 348	447	429, 357, 327	327, 299, 285	Luteolin-6-C-hexoside (orientin)	12.7 ± 0.5 ^c
15	57.3	270, 346	447	429, 357, 327	327, 299, 285	Luteolin-8-C-hexoside (isoorientin)	5.4 ± 0.1 ^c
16	59.2	270, 340	431	341, 311	283	Apigenin-8-C-hexoside (vitexin)	4.79 ± 0.05 ^c
17	62.7	290, 340	287	269, 259, 243	241, 215, 173, 151, 125	Dihydrokaempferol	9.6 ± 0.1 ^c
18	64.1	274, 340	461	371, 341	313, 298	Scoparin	5.14 ± 0.02 ^c
19	66.2	274, 335	689	609, 591, 569	519, 489, 399, 369	Luteolin-C-hexoside-C-pentosidederivative	11.06 ± 0.05 ^c
20	68.3	274, 340	533	473, 443	383, 353	Apigenin-6,8-di-C-pentoside	2.39 ± 0.02 ^c
21	71.6	275, 330	673	593, 575, 503	473, 383, 353	Apigenin-di-C-hexoside sulfate	11.6 ± 0.2 ^c
22	75.4	280, 370	301	179, 151	151	Quercetin	2.54 ± 0.01 ^c
23	77.2	260, 285, 350	285	241, 217, 199, 175, 151, 133	-	Luteolin	2.30 ± 0.06 ^c
24	79.8	268, 350	315	300	283, 271, 227, 151	Isorhamnetin	5.10 ± 0.04 ^c
25	80.0	268, 343	329	314	299	Tricin	3.46 ± 0.08 ^c
						Total	123.3 ± 0.7 ^c

Ions at bold represent base peaks; ^a identification and quantification performed using authentic standard; ^b expressed as catechin equivalents; ^c expressed as rutin equivalents.