BioMed Research International / 2013 / Article / Tab 2

Research Article

Characterization of Bioactive Compounds in Tunisian Bitter Orange (Citrus aurantium L.) Peel and Juice and Determination of Their Antioxidant Activities

Table 2

Contents (mg/g) and percentages (%) of phenolic compounds of bitter orange peel and juiceA.

Phenolic compoundsPeelJuice
%Mg/g%Mg/L

Phenolic acids73.80 ± 3.33 a1.03 ± 0.0271.25 ± 0.25a473.89 ± 0.30
Gallic acid1.84 ± 0.25b0.03 ± 0.0113.05 ± 0.01a84.53 ± 0.07
Hydroxybenzoic acid1.13 ± 0.65b0.02 ± 0.014.05 ± 0.11a27.88 ± 0.05
Chlorogenic acid8.63 ± 0.13a0.12 ± 0.01
Syringic acid1.69 ± 0.46b0.02 ± 0.012.24 ± 0.00a13.75 ± 0.1
Vanillic acid1.75 ± 0.57b0.02 ± 0.012.61 ± 0.04a17.19 ± 0.01
Rosmarinic acid5.58 ± 0.65a0.08 ± 0.025.43 ± 0.10a36.84 ± 0.02
Trans-2-hydroxycinnamic acid3.15 ± 0.28a0.04 ± 0.014.56 ± 0.05a30.69 ± 0.20
Trans-cinnamic acid1.56 ± 0.65b0.02 ± 0.012.58 ± 0.01a15.64 ± 0.09
p-Coumaric acid24.68 ± 2.64 a0.34 ± 0.0118.02 ± 0.22b116.13 ± 0.18
Ferulic acid23.79 ± 3.27 a0.33 ± 0.02 19.04 ± 0.22b131.24 ± 0.21
Flavonoids23.02 ± 3.83 a0.33 ± 0.0723.13 ± 1.11a136.91 ± 0.17
Epicatechin2.77 ± 0.83b0.04 ± 0.025.36 ± 0.15a36.47 ± 0.05
Catechin3.17 ± 0.27a0.04 ± 0.013.16 ± 0.08a20.24 ± 0.09
Rutin9.91 ± 1.18a0.14 ± 0.035.98 ± 0.19b37.21 ± 0.10
Naringin5.23 ± 1.15a0.07 ± 0.025.59 ± 0.04a35.05 ± 0.12
Flavone1.95 ± 1.98a0.03 ± 0.031.19 ± 0.01a7.96 ± 0.01
Phenolic monoterpenes3.51 ± 0.17a23.54 ± 0.03
Tyrosol3.51 ± 0.17a23.54 ± 0.03
Unknown3.18 ± 0.500.04 ± 0.013.6222.79 ± 0.08

Total1001.40 ± 0.09100657.13 ± 0.27

AValues are given as mean ± SD ( ). Values followed by the same letter did not share significant differences at (Duncan’s test). —: not detected.

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