Table 1.

Concentration levels of main phenolic compounds in olive leaves.

Class	Phenolic Compounds	Range (ng/mL Extract)	Ref	Range (mg/g dw)	Ref	Range (mg/g fw)	Ref
Secoiridoids	Oleuropein aglycone	45.7–548.1	[8]	0.09–0.27	[48]
				0.011–0.13	[8]
	Oleuropein glucoside	380–1548	[8]	0.72–1.48	[48]	1.29–2.11	[49]
				0.28–0.68	[50]
				1.8–3.4	[49]
				0.07–0.38	[8]
	Demethyloleuropein	16.3–2121	[8]	0.18–0.40	[48]
				0.0051–0.38	[8]
	Oleuropein	50.4–23,485	[51]	15–81	[45]	30.46–71.12	[52]
		6750–126,940	[4]	43.4–122.3	[53]	0.081–0.753	[54]
		22,942	[55]	0.11–4.74	[56]	0.082–0.70	[57]
		19,880–73,650	[53]	21.5–106.5	[58]	40.3–99.3	[59]
		21,571–37,791	[8]	37.8–71.3	[48]	0.04–1.69	[60]
				0.65–14.08	[50]	69–108.6	[49]
				0.073–0.416	[61]	0.086–0.334	[61]
				7.8–13.5	[62]
				0.79–13.65	[4]
				169.32–210.65	[63]
				0.60–0.78	[64]
				0.65–1.41	[65]
				14.1–40.4	[66]
				0.50–22.42	[60]
				3–48	[49]
				11.84–14.01	[67]
				67.05–74.81	[68]
				65.57–69.91	[69]
				63.35	[30]
				4.68–10.08	[8]
	Hydroxyoleuropein	380.2–886.9	[8]	0.30–1.95	[50]	0.02–0.06	[60]
				0.01–0.19	[60]
				0.10–0.28	[8]
	Ligstroside			0.78–0.99	[48]	1.18–4.16	[70]
				0.36–0.95	[50]	0.01–0.11	[60]
				0.01–0.80	[60]	1.35–2.13	[49]
				0.6–0.9	[49]
	Methoxyoleuropein			0.051–0.186	[48]
	Oleoside			0.031–0.051	[48]	0.05–0.08	[60]
				0.97–2.22	[50]
				0.10–0.15	[60]
	Secologanoside			0.92–1.49	[48]	0.28–0.37	[60]
				0.18–0.81	[60]
	Verbascoside	914	[55]	0.62–2.23	[53]	0.47–1.26	[52]
		2.9–26	[8]	0.005–0.170	[56]	0.021–0.148	[54]
				2.91	[71]	0.36–2.31	[72]
				0.178–0.351	[62]	0.01–0.18	[60]
				1.98–4.40	[66]	1.5–2.7	[49]
				0.06–1.05	[60]
				0.3–1.9	[49]
				0.43–0.47	[68]
				0.060–2.32	[8]
	Isoverbascoside	91.6–3847	[8]	0.024–0.97	[8]
	Elenolic acid glucoside			0.111–0.536	[48]
				0.52–4.03	[50]
Flavonoids	Flavones
	Luteolin	71.5–2357	[51]	0.09–3.04	[45]	0.003–0.400	[54]
				0.0018–0.274	[56]	0.14–0.58	[60]
				0.006–0.025	[48]
				0.220	[71]
				0.14–0.63	[66]
				0.05–1.18	[60]
				0.07–0.60	[73]
	Luteolin-7-O-glucoside	2370–9030	[4]	0.94–4.65	[53]	0.31–1.54	[60]
		3742	[55]	0.0083–0.819	[56]	8.9–10.6	[49]
		197.7–658.1	[8]	2.25	[71]
				0.28–0.97	[4]
				0.49–0.83	[64]
				0.76–1.30	[65]
				2.95–4.45	[66]
				1.02–2.15	[60]
				2.6–11.1	[49]
				1.32–1.82	[69]
				2.71	[30]
				0.05–0.12	[8]
	Luteolin glucoside			1.53–2.62	[48]	0.18–0.73	[60]
				0.60–1.54	[50]
				0.32–0.90	[60]
	Luteolin diglucoside	12.4–104.8	[8]	0.15–0.25	[48]	0.01–0.03	[60]
				0.02–0.05	[60]
				0.003–0.03	[8]
	Luteolin rutinoside			0.19–0.41	[48]	0.02–0.11	[60]
				0.14–0.22	[60]	0.91–1.14	[49]
				0.48–0.99	[49]
	Luteolin-4′-O-glucoside			0.234–0.493	[62]
				0.22–0.30	[64]
				0.25–0.31	[65]
				19.16–31.02	[73]
	Apigenin	31.9–198	[51]	0.093	[71]
				0.023–0.094	[66]
				0.038	[73]
	Apigenin-7-O-glucoside	2147	[55]	0.73–3.01	[53]	0.013–1.46	[57]
				0.0094 –2.476	[56]
				0.347	[71]
				0.28–0.85	[66]
				1.00–2.06	[73]
	Apigenin diglucoside	11.2–31.6	[8]	0.09–0.26	[49]	0.12	[49]
				0.0028–0.0081	[8]
	Apigenin rutinoside	4.9–81.1	[8]	0.033–0.061	[48]	0.10–0.13	[60]
				0.14–0.31	[64]	0.74	[49]
				0.25–0.39	[65]
				0.06–0.17	[60]
				0.33–0.66	[49]
				0.0012–0.013	[8]
	Diosmetin	14.5–159	[51]
	Chrysoeriol-7-O-glucoside			0.058–0.173	[48]
	Flavanones
	Eriodictyol			0.0068	[71]
	Hesperidin			0.304	[71]
	Naringenin					0.029–4.05	[57]
	Neohesperidin			0.39–0.99	[49]	0.78–1.13	[49]
	Flavonols
	Rutin	357	[55]	0.02–1.65	[45]	0.034–1.331	[54]
				0.0026–0.825	[56]	0.03–0.14	[60]
				0.18–0.29	[48]
				0.35–0.98	[66]
				0.19–0.39	[60]
				2.01–2.94	[68]
				0.43–0.85	[73]
	Quercetin rutinoside	14.89	[55]	0.078–0.245	[64]
		191–1379	[8]	0.16–0.25	[65]
				0.047–0.37	[8]
	Quercetin galactoside	30.57	[55]
	Quercetin glucoside	0–115.3	[8]	0–0.003	[8]
	Quercetin rhamnoside	0–86.9	[8]	0–0.0023	[8]
	Quercetin	0.021–247	[51]	0.02–0.37	[45]	0.002–2.73	[57]
				0.18–0.76	[53]
				0.040	[71]
				0.0008–0.0021	[73]
	Hyperoside			0.067	[71]
	Kaempferol			0.0029	[71]	0.039–8.86	[57]
	Isorhamnetin					0.052–2.41	[57]
	Flavanonols
	Taxifolin			0.0082	[71]
	Flavan-3-ols
	Catechin			0.18–0.36	[66]
				0–0.0376	[56]	0.16–3.29	[57]
	Epicatechin	21.7	[55]
Simple	Phenylethanoids
phenols	Tyrosol	1681	[55]	0.2–1.95	[45]	0.001–0.036	[54]
				0.0021–0.175	[56]
				0.033–0.088	[66]
	Tyrosol glucoside			0.76–1.44	[48]
	Hydroxytyrosol	9.2–3682	[51]	0.02–27.20	[45]	0.189–1.313	[54]
		10,925	[55]	0.0054 –0.290	[56]
				0.56–2.94	[58]
				0.21–0.60	[66]
				0.33–0.40	[67]
				0.87–2.19	[68]
	Hydroxytyrosol glucoside	570–2357	[8]	1.61–2.37	[48]	1.01–4.60	[52]
				0.57–1.41	[60]	0.85–3.41	[72]
				0.13–0.58	[8]	0.82–1.03	[60]
	Hydroxycinnamic acids
	Caffeic acid	201.5	[55]	0.34–2.11	[45]	0.014–0.85	[57]
				0.0026–0.432	[56]	0.04–0.10	[72]
				0.015	[71]
				0.27–0.39	[68]
	p-Coumaric acid	0.81	[55]	0.15–2.34	[45]	0.003–0.49	[57]
				0.081	[71]
	Chlorogenic acid	30.72	[55]	0.0027	[71]
				0.39–0.47	[68]
	Cinnamic acid					0.005–1.09	[57]
	Ferulic acid			0.003–0.25	[45]	0.016–0.79	[57]
				0.046	[71]
	Syringic acid			0.002–0.09	[45]	0.017–1.16	[57]
				0.0028	[71]
	hydroxybenzoic acids
	Vanillic acid			0.0032–0.257	[56]
				0.016	[71]
	Vanillin	0.47	[55]	0.0016–0.147	[56]
	Sinapic acid			0.0049	[71]
	Gallic acid	1.73	[55]	1.15–3.04	[45]	0.68–1.45	[57]
				0.0026	[71]
	Protocatechuic acid			0.40–3.23	[45]
				17.48	[71]
	2,5-Dihydroxybenzoic acid			0.0055	[71]
	3,4-Dihydroxybenzoic acid					0.11–2.07	[57]
	4-Hydroxybenzoic acid			0.015	[71]
	3,4-Dihydroxyphenylacetic acid			0.47	[71]
Lignans	Pinoresinol			0.004	[71]

Dw: dry weight; fw: fresh weight.