Adsorption of Polyphenols from Almond Blanching Water by Macroporous Resin

Table 2

Phenolic compounds identified by UPLC-DAD/ESI-MSn in almond skin extracts.

Peak	Suggested structure	(min)	[M-H]^- (m/z)	MS2 (m/z)	UVmax (nm)
1	(Epi)catechin digallate	1.5	593	441; 315; 289	277
2	Protocatechuic dihexose	1.9	477	323; 225; 153	277
3	Vanillic acid dihexose	2	491	323; 167	256; 288
4	Vanillic acid hexose	2.2	329	167	254; 291
5	Vanillic acid dihexose	3	491	323; 167	279
6	3-O-caffeoylquinic	2.9	353	191	211; 344
7	(Epi)catechin dihexose	3.2	613	289	280
8	B-type dimer	4	577	289	280
9	4-p-Coumaroylquinic acid	4.2	337	163; 191	308
10	Catechin	4.6	289	245	280
11	Chlorogenic acid	4.75	353	191; 179	325
12	B-type trimer	5.3	865	577	280
13	B-type tetramer	5.6	1153	289; 865	280
14	B-type dimer	6.25	577	289	280
15	Epicatechin	7	289	245; 205	279
16	Kaempferol-3-O-rutinoside	10	593	285	347
17	Isorhamnetin-3-O-rutinoside	10.2	623	315	346
18	Isorhamnetin-3-O-glucoside	10.3	477	315	346
19	Kaempferol-3-O-glucoside	10	447	285	347
20	Rutin	10.9	609	301	350