Analysis of Phenolic Acids of Jerusalem Artichoke (Helianthus tuberosus L.) Responding to Salt-Stress by Liquid Chromatography/Tandem Mass Spectrometry

Table 2

Concentration of total phenolics and phenolic compounds in H. tuberosus leaves (cv. NanYu).

Phenolic compounds	Concentration^a (mg/g dry weight)
Caffeoylquinic acid (peak 2)^b	0.063 ± 0.008^d
3-o-Caffeoylquinic acid	7.752 ± 2.872^b
Caffeoylquinic acid (peak 4)^b	0.538 ± 0.081^d
Caffeic acid	0.098 ± 0.052^d
p-Coumaroyl-quinic acid	0.153 ± 0.061^d
Feruloylquinic acid	0.527 ± 0.199^d
3,4-Dicaffeoylquinic acid	0.618 ± 0.215^d
3,5-Dicaffeoylquinic acid	4.900 ± 1.492^c
Caffeoyl glucopyranose^c	0.001 ± 0.319^d
1,5-Dicaffeoylquinic acid	1.733 ± 0.567^d
Isorhamnetin glucoside^d	0.348 ± 0.057^d
4,5-Dicaffeoylquinic acid	5.633 ± 2.990^bc
Kaempferol glucuronide^d	0.186 ± 0.034^d
Kaempferol-3-o-glucoside^d	1.020 ± 0.379^d
Total phenolics^e	23.570
Total phenolics^f	30.159 ± 4.410^a

aValues are expressed as mean ± SD of triplicate measurements; the means in a column followed by the same letters represent values that are not significantly different according to Duncan’s test (𝑃≤0.05); ^bquantified as 3-o-caffeoylquinic acid; ^cquantified as caffeic acid; ^dquantified as glucoside; ^esum of the individual phenolic compounds; and ^fquantified as gallic acid equivalents.