Table 1.

Individual phenolic compounds identified by UPLC-PDA-MS/MS in barley young plants.

Compound		RT *	λmax	[M-H] m/z		Content (%)
		min	nm	MS	MS/MS	0 ppm 0 min	10 ppm 10 min	30 ppm 10 min	50 ppm 10 min
1	p-coumaric acid	2.73	309	163	119	0.06	0.30	0.34	0.25
2	Caftaric acid	2.96	288 sh. 327	311	179	0.15	0.19	0.30	0.17
3	Feruloyl-caffeic acid	3.15	288 sh. 322	367	193	0.12	0.14	0.21	0.09
4	Unspecified caffeic derivative	3.24	288 sh. 324	425	367	0.04	0.31	0.34	0.32
5	Luteolin 6-C-arabinoside-8-C-glucoside	3.38	274. 341	579	447. 285	1.25	0.92	0.90	0.91
6	Isoscoparin 7-O-glucoside	3.51	276. 333	623	461. 299	0.22	0.32	0.36	0.04
7	Isoorientin 7-O-glucoside	3.75	269. 347	609	447. 285	1.21	1.18	0.91	1.42
8	Isovitexin 7-O-glucoside	3.88	269. 331	593	431	81.72	79.42	82.06	82.31
9	Isovitexin 7-O-(6″-p-coumaroyl)-glucoside	3.98	271. 324	739	593	1.49	2.69	1.82	2.05
10	Isovitexin	4.18	270. 338	431	269	0.52	0.03	0.20	0.35
11	Isoorientin 7-O-(6″-sinapoyl)-glucoside	4.57	271. 338	815	447	0.43	0.25	0.37	0.22
12	Isoorientin 7-O-(6″-feruloyl)-glucoside	4.72	271. 338	785	447	0.40	0.05	0.09	0.12
13	Isovitexin 7-O-(6″-sinapoyl)-glucoside	5.00	271. 334	799	431	6.33	8.86	7.42	6.61
14	Isovitexin 7-O-(6″-sinapoyl)-glucoside-4′-O-glucoside	5.11	270. 338	961	799. 593	0.51	0.37	0.18	0.11
15	Isovitexin 7-O-(6″-feruloyl)-glucoside	5.21	271. 331	769	431	4.71	4.48	4.04	4.50
16	Apigenin 6-C-arabinoside-8-C-glucoside	5.35	269. 329	563	443	0.87	0.51	0.47	0.54

* RT—retention time; sh = shoulder peak; ±SD and n = 3; FD. Note. Differences in results between the dose of ozone are indicated by different capital letters. difference at significant level α < 0.05.