Componential Profile and Amylase Inhibiting Activity of Phenolic Compounds from Calendula officinalis L. Leaves

Table 3

Content of phenolic compounds in nine varieties of C. officinalis leaves, mg g⁻¹ from dry plant weight.

Compound	Variety
	“Egypt Sun”	“Flame Dance”	“Geisha”	“Green Heart Orange”	“Indian Prince”	“Radio”	“Red Black Centered”	“Russian Size”	“Touch of Red”
Phenylpropanoids
Caffeic acid	0.46	1.14	0.31	0.57	0.43	0.64	0.39	0.29	0.20
3-O-Caffeoylquinic acid	6.48	13.25	6.59	2.41	2.35	8.85	2.31	1.95	1.73
3,5-Di-O-caffeoylquinic acid	2.37	4.91	0.80	0.08	1.90	3.90	0.86	0.40	0.23
1,5-Di-O-caffeoylquinic acid	0.46	0.33	0.34	0.10	0.52	1.53	0.24	0.19	0.27
4,5-Di-O-caffeoylquinic acid	0.18	0.54	0.20	0.07	0.39	0.36	0.33	0.12	0.15
Total phenylpropanoids	9.95	20.17	8.24	3.23	5.59	15.28	4.13	2.95	2.58
Flavonoids
Quercetin derivatives
Isoquercitrin	3.93	2.73	4.32	5.34	3.44	5.02	5.34	4.59	5.14
Rutin	0.22	0.17	0.92	0.63	0.29	0.27	0.72	0.15	0.17
Quercetin-3-O-(6′′-acetyl)-𝛽-D-glycoside	2.50	1.68	4.36	3.14	2.67	4.25	4.30	3.03	6.85
Total quercetin derivatives	6.65	4.58	9.60	9.11	6.40	9.54	10.36	7.77	12.16
Isorhamnetin derivatives
Thyphaneoside	0.78	0.74	1.01	1.08	0.92	0.97	1.37	2.46	0.73
Isorhamnetin-3-O-𝛽-D-glucoside	0.63	0.44	0.71	2.41	0.88	0.22	2.15	0.36	1.04
Isorhamnetin-3-O-(6′′-acetyl)-𝛽-D-glycoside	0.62	0.35	1.21	2.08	0.81	0.80	1.64	0.32	1.81
Total isorhamnetin derivatives	2.03	1.53	2.93	5.57	2.61	1.99	5.16	3.14	3.58
Total flavonoids	8.68	6.11	12.53	14.68	9.01	11.53	15.52	10.91	15.74
Total identified	18.63	26.28	20.77	17.91	14.60	26.81	19.65	13.86	18.32
Quercetin/isorhamnetin ratio	3.28	2.99	3.28	1.64	2.45	4.79	2.01	2.48	3.40
Phenylpropanoid/flavonoid ratio	1.15	3.30	0.66	0.22	0.62	1.33	0.27	0.27	0.16