Phenolic Compounds from Olea europaea L. Possess Antioxidant Activity and Inhibit Carbohydrate Metabolizing Enzymes In Vitro
Table 1
Total polyphenolic and tannin content and quantification of identified compounds in Olea europaea fruit extracts.
Chemlal
Coratina
Frantoio
Leccino
Maiatica
Ogliarola
Sigoise
TPC
272.83 ± 9.84
290.21 ± 13.21
223.81 ± 16.18
224.92 ± 9.26
182.35 ± 7.54
226.89 ± 6.63
147.13 ± 6.94
TTC
81.28 ± 10.69
52.92 ± 4.32
63.95 ± 5.36
86.86 ± 8.74
66.27 ± 6.45
57.51 ± 5.54
20.08 ± 3.12
mg of gallic acid/Kg of dried extract
13.42 ± 2.41
191.63 ± 12.01
1349.75 ± 29.31
1097.51 ± 11.52
528.24 ± 33.22
328.35 ± 16.21
1440.91 ± 20.01
-Hydroxybenzoic
nd
nd
309.36 ± 44.12
66.43 ± 19.74
308.87 ± 20.34
116.42 ± 13.11
3.22 ± 0.87
Vanillic acid
34.84 ± 7.74
134.66 ± 10.41
203.46 ± 9.14
nd
493.94 ± 14.77
37.53 ± 14.75
200.93 ± 6.41
Caffeic acid
8.72 ± 0.74
80.65 ± 2.93
142.17 ± 4.47
129.32 ± 1.42
96.46 ± 8.36
83.42 ± 5.74
29.64 ± 0.77
Syringic acid
6.64 ± 0.62
32.84 ± 1.93
81.65 ± 0.33
63.24 ± 0.89
120.68 ± 1.47
39.12 ± 0.15
13.64 ± 1.81
-Coumaric acid
17.65 ± 1.61
6.57 ± 0.28
35.74 ± 0.64
21.95 ± 0.84
19.33 ± 0.55
28.74 ± 2.08
66.37 ± 1.11
Ferulic acid
103.09 ± 1.97
37.78 ± 1.56
25.22 ± 2.27
31.75 ± 1.84
156.54 ± 2.91
31.36 ± 1.76
63.38 ± 0.82
Sinapic acid
23.46 ± 0.33
30.64 ± 4.16
25.95 ± 2.58
24.22 ± 0.12
44.67 ± 3.47
31.85 ± 0.65
26.34 ± 0.97
Tyrosol
100.21 ± 1.03
134.75 ± 18.87
200.84 ± 75.12
194.13 ± 27.24
17.96 ± 7.39
115.74 ± 14.91
34.34 ± 3.62
Hydroxytyrosol
2024.63 ± 26.01
1927.57 ± 104.37
2338.45 ± 82.11
1876.23 ± 123.01
3683.44 ± 364.27
2974.14 ± 23.72
245.23 ± 25.81
Verbascoside
21.37 ± 0.64
319.78 ± 7.51
693.77 ± 13.66
643.09 ± 18.47
718.68 ± 9.74
335.34 ± 4.16
52.72 ± 0.95
Oleuropein
109.86 ± 3.68
126.92 ± 13.84
2562.63 ± 46.88
1074.28 ± 47.85
1361.47 ± 71.71
804.56 ± 52.43
216.70 ± 12.34
Luteolin
201.70 ± 1.55
221.74 ± 6.48
585.64 ± 44.72
2828.86 ± 107.24
513.24 ± 77.64
1362.51 ± 35.67
109.54 ± 1.22
Chrysoeriol
21.73 ± 0.71
11.68 ± 0.56
135.57 ± 4.13
303.14 ± 7.21
549.25 ± 14.94
158.74 ± 3.87
36.37 ± 0.56
TPC: total polyphenolic content; TTC: total tannin content; values are the mean of three determinations ± standard deviation (). Milligrams of gallic acid equivalents per g of extract; milligrams of tannic acid equivalents per g of extract; mg of compound per Kg of extract.
