Characterization of Bioactive Compounds in Tunisian Bitter Orange (Citrus aurantium L.) Peel and Juice and Determination of Their Antioxidant Activities
Identifieur interne : 000B29 ( Pmc/Checkpoint ); précédent : 000B28; suivant : 000B30Characterization of Bioactive Compounds in Tunisian Bitter Orange (Citrus aurantium L.) Peel and Juice and Determination of Their Antioxidant Activities
Auteurs : Iness Jabri Karoui [Tunisie] ; Brahim Marzouk [Tunisie]Source :
- BioMed Research International [ 2314-6133 ] ; 2013.
Abstract
Url:
DOI: 10.1155/2013/345415
PubMed: 23841062
PubMed Central: 3697287
Affiliations:
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PMC:3697287Le document en format XML
<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Characterization of Bioactive Compounds in Tunisian Bitter Orange (<italic>Citrus aurantium</italic>
L.) Peel and Juice and Determination of Their Antioxidant Activities</title>
<author><name sortKey="Jabri Karoui, Iness" sort="Jabri Karoui, Iness" uniqKey="Jabri Karoui I" first="Iness" last="Jabri Karoui">Iness Jabri Karoui</name>
<affiliation wicri:level="1"><nlm:aff id="I1">Laboratoire des Substances Bioactives, Centre de Biotechnologie à la Technopole de Borj-Cédria (CBBC), BP 901, 2050 Hammam-lif, Tunisia</nlm:aff>
<country xml:lang="fr">Tunisie</country>
<wicri:regionArea>Laboratoire des Substances Bioactives, Centre de Biotechnologie à la Technopole de Borj-Cédria (CBBC), BP 901, 2050 Hammam-lif</wicri:regionArea>
<wicri:noRegion>2050 Hammam-lif</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Marzouk, Brahim" sort="Marzouk, Brahim" uniqKey="Marzouk B" first="Brahim" last="Marzouk">Brahim Marzouk</name>
<affiliation wicri:level="1"><nlm:aff id="I1">Laboratoire des Substances Bioactives, Centre de Biotechnologie à la Technopole de Borj-Cédria (CBBC), BP 901, 2050 Hammam-lif, Tunisia</nlm:aff>
<country xml:lang="fr">Tunisie</country>
<wicri:regionArea>Laboratoire des Substances Bioactives, Centre de Biotechnologie à la Technopole de Borj-Cédria (CBBC), BP 901, 2050 Hammam-lif</wicri:regionArea>
<wicri:noRegion>2050 Hammam-lif</wicri:noRegion>
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<idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3697287</idno>
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<idno type="doi">10.1155/2013/345415</idno>
<date when="2013">2013</date>
<idno type="wicri:Area/Pmc/Corpus">000E46</idno>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Characterization of Bioactive Compounds in Tunisian Bitter Orange (<italic>Citrus aurantium</italic>
L.) Peel and Juice and Determination of Their Antioxidant Activities</title>
<author><name sortKey="Jabri Karoui, Iness" sort="Jabri Karoui, Iness" uniqKey="Jabri Karoui I" first="Iness" last="Jabri Karoui">Iness Jabri Karoui</name>
<affiliation wicri:level="1"><nlm:aff id="I1">Laboratoire des Substances Bioactives, Centre de Biotechnologie à la Technopole de Borj-Cédria (CBBC), BP 901, 2050 Hammam-lif, Tunisia</nlm:aff>
<country xml:lang="fr">Tunisie</country>
<wicri:regionArea>Laboratoire des Substances Bioactives, Centre de Biotechnologie à la Technopole de Borj-Cédria (CBBC), BP 901, 2050 Hammam-lif</wicri:regionArea>
<wicri:noRegion>2050 Hammam-lif</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Marzouk, Brahim" sort="Marzouk, Brahim" uniqKey="Marzouk B" first="Brahim" last="Marzouk">Brahim Marzouk</name>
<affiliation wicri:level="1"><nlm:aff id="I1">Laboratoire des Substances Bioactives, Centre de Biotechnologie à la Technopole de Borj-Cédria (CBBC), BP 901, 2050 Hammam-lif, Tunisia</nlm:aff>
<country xml:lang="fr">Tunisie</country>
<wicri:regionArea>Laboratoire des Substances Bioactives, Centre de Biotechnologie à la Technopole de Borj-Cédria (CBBC), BP 901, 2050 Hammam-lif</wicri:regionArea>
<wicri:noRegion>2050 Hammam-lif</wicri:noRegion>
</affiliation>
</author>
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<series><title level="j">BioMed Research International</title>
<idno type="ISSN">2314-6133</idno>
<idno type="eISSN">2314-6141</idno>
<imprint><date when="2013">2013</date>
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<front><div type="abstract" xml:lang="en"><p><italic>Citrus aurantium</italic>
peel and juice aroma compounds were investigated by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS), whereas phenolic compounds analysis was performed by reversed-phase high-performance liquid chromatography (RP-HPLC). Limonene was the major volatile compound of bitter orange peel (90.25%) and juice (91.61%). HPLC analysis of bitter orange peel and juice methanolic extracts indicated that phenolic acids constitute their main phenolic class representing 73.80% and 71.25%, respectively, followed by flavonoids (23.02% and 23.13%, resp.). <italic>p</italic>
-Coumaric and ferulic acids were the most abundant phenolic compounds representing 24.68% and 23.79%, respectively, in the peel, while the juice contained 18.02% and 19.04%, respectively. The antioxidant activities of bitter orange peel and juice methanolic extracts have been evaluated using four <italic> in vitro</italic>
assays, and the results were compared with the standard antioxidants (BHT, BHA, and ascorbic acid). Our findings demonstrated that <italic>Citrus aurantium</italic>
peel and juice possess antioxidant activities which were less effective than those of antioxidant standards. Both extracts may be suggested as a new potential source of natural antioxidant.</p>
</div>
</front>
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<pmc article-type="research-article"><pmc-dir>properties open_access</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Biomed Res Int</journal-id>
<journal-id journal-id-type="iso-abbrev">Biomed Res Int</journal-id>
<journal-id journal-id-type="publisher-id">BMRI</journal-id>
<journal-title-group><journal-title>BioMed Research International</journal-title>
</journal-title-group>
<issn pub-type="ppub">2314-6133</issn>
<issn pub-type="epub">2314-6141</issn>
<publisher><publisher-name>Hindawi Publishing Corporation</publisher-name>
</publisher>
</journal-meta>
<article-meta><article-id pub-id-type="pmid">23841062</article-id>
<article-id pub-id-type="pmc">3697287</article-id>
<article-id pub-id-type="doi">10.1155/2013/345415</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject>
</subj-group>
</article-categories>
<title-group><article-title>Characterization of Bioactive Compounds in Tunisian Bitter Orange (<italic>Citrus aurantium</italic>
L.) Peel and Juice and Determination of Their Antioxidant Activities</article-title>
</title-group>
<contrib-group><contrib contrib-type="author"><name><surname>Jabri karoui</surname>
<given-names>Iness</given-names>
</name>
<xref ref-type="aff" rid="I1"></xref>
<xref ref-type="corresp" rid="cor1">*</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Marzouk</surname>
<given-names>Brahim</given-names>
</name>
<xref ref-type="aff" rid="I1"></xref>
</contrib>
</contrib-group>
<aff id="I1">Laboratoire des Substances Bioactives, Centre de Biotechnologie à la Technopole de Borj-Cédria (CBBC), BP 901, 2050 Hammam-lif, Tunisia</aff>
<author-notes><corresp id="cor1">*Iness Jabri karoui: <email>iness.karoui@yahoo.fr</email>
</corresp>
<fn fn-type="other"><p>Academic Editor: Jose R. Botella</p>
</fn>
</author-notes>
<pub-date pub-type="ppub"><year>2013</year>
</pub-date>
<pub-date pub-type="epub"><day>13</day>
<month>6</month>
<year>2013</year>
</pub-date>
<volume>2013</volume>
<elocation-id>345415</elocation-id>
<history><date date-type="received"><day>16</day>
<month>4</month>
<year>2013</year>
</date>
<date date-type="rev-recd"><day>18</day>
<month>5</month>
<year>2013</year>
</date>
<date date-type="accepted"><day>22</day>
<month>5</month>
<year>2013</year>
</date>
</history>
<permissions><copyright-statement>Copyright © 2013 I. Jabri karoui and B. Marzouk.</copyright-statement>
<copyright-year>2013</copyright-year>
<license license-type="open-access"><license-p>This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.</license-p>
</license>
</permissions>
<abstract><p><italic>Citrus aurantium</italic>
peel and juice aroma compounds were investigated by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS), whereas phenolic compounds analysis was performed by reversed-phase high-performance liquid chromatography (RP-HPLC). Limonene was the major volatile compound of bitter orange peel (90.25%) and juice (91.61%). HPLC analysis of bitter orange peel and juice methanolic extracts indicated that phenolic acids constitute their main phenolic class representing 73.80% and 71.25%, respectively, followed by flavonoids (23.02% and 23.13%, resp.). <italic>p</italic>
-Coumaric and ferulic acids were the most abundant phenolic compounds representing 24.68% and 23.79%, respectively, in the peel, while the juice contained 18.02% and 19.04%, respectively. The antioxidant activities of bitter orange peel and juice methanolic extracts have been evaluated using four <italic> in vitro</italic>
assays, and the results were compared with the standard antioxidants (BHT, BHA, and ascorbic acid). Our findings demonstrated that <italic>Citrus aurantium</italic>
peel and juice possess antioxidant activities which were less effective than those of antioxidant standards. Both extracts may be suggested as a new potential source of natural antioxidant.</p>
</abstract>
</article-meta>
</front>
<floats-group><fig id="fig1" orientation="portrait" position="float"><label>Figure 1</label>
<caption><p>RP-HPLC chromatographic profiles of phenolic acids, flavonoids, and phenolic monoterpenes standards and <italic>Citrus aurantium </italic>
peel and juice extracts monitored at 280 nm. *The peak numbers correspond to the following: 1. caffeic acid; 2. gallic acid; 3. <italic>p</italic>
-hydroxybenzoic acid; 4. chlorogenic acid; 5. syringic acid; 6. vanillic acid; 7. <italic>p</italic>
-coumaric acid; 8. ferulic acid; 9. trans-2-hydroxycinnamic acid; 10. rosmarinic acid; 11. <italic>o</italic>
-coumaric acid; 12. cinnamic acid; 13. trans-cinnamic acid; 14. epicatechin gallate; 15. catechin; 16. rutin; 17. naringin; 18. quercetrin; 19. luteolin; 20. quercetin; 21. apigenin; 22. amentoflavone; 23. flavone; 24. tyrosol; 25. thymol; S1. resorcinol. </p>
</caption>
<graphic xlink:href="BMRI2013-345415.001"></graphic>
</fig>
<table-wrap id="tab1" orientation="portrait" position="float"><label>Table 1</label>
<caption><p>Essential oil composition of <italic>Citrus aurantium </italic>
peel and juice<sup>A</sup>
.</p>
</caption>
<table frame="hsides" rules="groups"><thead><tr><th align="left" rowspan="1" colspan="1">Volatile compounds</th>
<th align="center" rowspan="1" colspan="1">RI<sup>a</sup>
</th>
<th align="center" rowspan="1" colspan="1">RI<sup>b</sup>
</th>
<th align="center" rowspan="1" colspan="1">Peel</th>
<th align="center" rowspan="1" colspan="1">Juice</th>
<th align="center" rowspan="1" colspan="1">Identification</th>
</tr>
</thead>
<tbody><tr><td align="left" rowspan="1" colspan="1"><italic>α</italic>
-thujene</td>
<td align="center" rowspan="1" colspan="1">928</td>
<td align="center" rowspan="1" colspan="1">1035</td>
<td align="center" rowspan="1" colspan="1">—</td>
<td align="center" rowspan="1" colspan="1">1.03 ± 0.04<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">IR. SM. Co-CG</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Tricyclen</td>
<td align="center" rowspan="1" colspan="1">930</td>
<td align="center" rowspan="1" colspan="1">1015</td>
<td align="center" rowspan="1" colspan="1">—</td>
<td align="center" rowspan="1" colspan="1">0.68 ± 0.18<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">IR. Co-CG. SM</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1"><italic>α</italic>
-Pinene</td>
<td align="center" rowspan="1" colspan="1">939</td>
<td align="center" rowspan="1" colspan="1">1032</td>
<td align="center" rowspan="1" colspan="1">0.55 ± 0.06<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">0.55 ± 0.01<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">IR. Co-CG. SM</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">β-Pinene</td>
<td align="center" rowspan="1" colspan="1">980</td>
<td align="center" rowspan="1" colspan="1">1118</td>
<td align="center" rowspan="1" colspan="1">0.44 ± 0.04<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">—</td>
<td align="center" rowspan="1" colspan="1">IR. SM. Co-CG</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Sabinene</td>
<td align="center" rowspan="1" colspan="1">975</td>
<td align="center" rowspan="1" colspan="1">1132</td>
<td align="center" rowspan="1" colspan="1">0.48 ± 0.16<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">—</td>
<td align="center" rowspan="1" colspan="1">CG-SM</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Myrcene</td>
<td align="center" rowspan="1" colspan="1">991</td>
<td align="center" rowspan="1" colspan="1">1174</td>
<td align="center" rowspan="1" colspan="1">0.04 ± 0.00<sup>b</sup>
</td>
<td align="center" rowspan="1" colspan="1">0.68 ± 0.16<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">IR. SM. Co-CG</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1"><italic>α</italic>
-Phellandrene</td>
<td align="center" rowspan="1" colspan="1">1006</td>
<td align="center" rowspan="1" colspan="1">1176</td>
<td align="center" rowspan="1" colspan="1">—</td>
<td align="center" rowspan="1" colspan="1">1.84 ± 0.04<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">CG-SM</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1"><italic>α</italic>
-Terpinene</td>
<td align="center" rowspan="1" colspan="1">1018</td>
<td align="center" rowspan="1" colspan="1">1188</td>
<td align="center" rowspan="1" colspan="1">1.10 ± 0.27<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">—</td>
<td align="center" rowspan="1" colspan="1">IR. CG-SM</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Limonene</td>
<td align="center" rowspan="1" colspan="1">1030</td>
<td align="center" rowspan="1" colspan="1">1203</td>
<td align="center" rowspan="1" colspan="1"><bold>90.25</bold>
<bold>±</bold>
<bold>0.81</bold>
<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1"><bold>91.61</bold>
<bold>±</bold>
<bold>0.97</bold>
<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">IR. SM. Co-CG</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">1-8 Cineole</td>
<td align="center" rowspan="1" colspan="1">1033</td>
<td align="center" rowspan="1" colspan="1">1213</td>
<td align="center" rowspan="1" colspan="1">0.87 ± 0.06<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">0.31 ± 0.04<sup>b</sup>
</td>
<td align="center" rowspan="1" colspan="1">IR. SM. Co-CG</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">E-β-Ocimene</td>
<td align="center" rowspan="1" colspan="1">1050</td>
<td align="center" rowspan="1" colspan="1">1266</td>
<td align="center" rowspan="1" colspan="1">0.36 ± 0.00<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">—</td>
<td align="center" rowspan="1" colspan="1">IR. CG-SM</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Terpinolene</td>
<td align="center" rowspan="1" colspan="1">1088</td>
<td align="center" rowspan="1" colspan="1">1290</td>
<td align="center" rowspan="1" colspan="1">0.28 ± 0.01<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">—</td>
<td align="center" rowspan="1" colspan="1">IR. SM. Co-CG</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Cis-linalool oxide</td>
<td align="center" rowspan="1" colspan="1">1074</td>
<td align="center" rowspan="1" colspan="1">1478</td>
<td align="center" rowspan="1" colspan="1">0.23 ± 0.03<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">0.49 ± 0.23<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">CG-SM</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Trans-linalool oxide</td>
<td align="center" rowspan="1" colspan="1">1088</td>
<td align="center" rowspan="1" colspan="1">1450</td>
<td align="center" rowspan="1" colspan="1">0.13 ± 0.01<sup>b</sup>
</td>
<td align="center" rowspan="1" colspan="1">0.21 ± 0.01<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">CG-SM</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Linalool</td>
<td align="center" rowspan="1" colspan="1">1098</td>
<td align="center" rowspan="1" colspan="1">1553</td>
<td align="center" rowspan="1" colspan="1">1.56 ± 0.08<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">—</td>
<td align="center" rowspan="1" colspan="1">IR. SM. Co-CG</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Linalyl acetate</td>
<td align="center" rowspan="1" colspan="1">1257</td>
<td align="center" rowspan="1" colspan="1">1556</td>
<td align="center" rowspan="1" colspan="1">0.29 ± 0.02<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">—</td>
<td align="center" rowspan="1" colspan="1">IR. SM. Co-CG</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Bornyl acetate</td>
<td align="center" rowspan="1" colspan="1">1270</td>
<td align="center" rowspan="1" colspan="1">1590</td>
<td align="center" rowspan="1" colspan="1">0.14 ± 0.05<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">—</td>
<td align="center" rowspan="1" colspan="1">CG-SM</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Terpinene-4-ol</td>
<td align="center" rowspan="1" colspan="1">1419</td>
<td align="center" rowspan="1" colspan="1">1612</td>
<td align="center" rowspan="1" colspan="1">0.06 ± 0.01<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">—</td>
<td align="center" rowspan="1" colspan="1">CG-SM</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">β-Caryophyllene</td>
<td align="center" rowspan="1" colspan="1">1178</td>
<td align="center" rowspan="1" colspan="1">1611</td>
<td align="center" rowspan="1" colspan="1">0.05 ± 0.01<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">—</td>
<td align="center" rowspan="1" colspan="1">CG-SM</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1"><italic>γ</italic>
-Elemene</td>
<td align="center" rowspan="1" colspan="1">1492</td>
<td align="center" rowspan="1" colspan="1">1623</td>
<td align="center" rowspan="1" colspan="1">0.05 ± 0.00<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">—</td>
<td align="center" rowspan="1" colspan="1">CG-SM</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Neral</td>
<td align="center" rowspan="1" colspan="1">1240</td>
<td align="center" rowspan="1" colspan="1">1694</td>
<td align="center" rowspan="1" colspan="1">0.13 ± 0.00<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">—</td>
<td align="center" rowspan="1" colspan="1">CG-SM</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">β-Farnesene</td>
<td align="center" rowspan="1" colspan="1">1456</td>
<td align="center" rowspan="1" colspan="1">1696</td>
<td align="center" rowspan="1" colspan="1">0.15 ± 0.15<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">—</td>
<td align="center" rowspan="1" colspan="1">CG-SM</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1"><italic>α</italic>
-Terpineol</td>
<td align="center" rowspan="1" colspan="1">1189</td>
<td align="center" rowspan="1" colspan="1">1709</td>
<td align="center" rowspan="1" colspan="1">0.56 ± 0.03<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">0.38 ± 0.08<sup>b</sup>
</td>
<td align="center" rowspan="1" colspan="1">IR. SM. Co-CG</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Neryl acetate</td>
<td align="center" rowspan="1" colspan="1">1385</td>
<td align="center" rowspan="1" colspan="1">1733</td>
<td align="center" rowspan="1" colspan="1">0.23 ± 0.03<sup>b</sup>
</td>
<td align="center" rowspan="1" colspan="1">0.36 ± 0.06<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">IR. SM. Co-CG</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Δ-Cadinene</td>
<td align="center" rowspan="1" colspan="1">1523</td>
<td align="center" rowspan="1" colspan="1">1755</td>
<td align="center" rowspan="1" colspan="1">0.28 ± 0.02<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">—</td>
<td align="center" rowspan="1" colspan="1">CG-SM</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Geranyl acetate</td>
<td align="center" rowspan="1" colspan="1">1383</td>
<td align="center" rowspan="1" colspan="1">1765</td>
<td align="center" rowspan="1" colspan="1">0.11 ± 0.00<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">—</td>
<td align="center" rowspan="1" colspan="1">IR. SM. Co-CG</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Nerol</td>
<td align="center" rowspan="1" colspan="1">1228</td>
<td align="center" rowspan="1" colspan="1">1797</td>
<td align="center" rowspan="1" colspan="1">0.08 ± 0.00<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">—</td>
<td align="center" rowspan="1" colspan="1">CG-SM</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Geraniol</td>
<td align="center" rowspan="1" colspan="1">1255</td>
<td align="center" rowspan="1" colspan="1">1857</td>
<td align="center" rowspan="1" colspan="1">0.16 ± 0.01<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">—</td>
<td align="center" rowspan="1" colspan="1">IR. SM. Co-CG</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">E-Nerolidol</td>
<td align="center" rowspan="1" colspan="1">1566</td>
<td align="center" rowspan="1" colspan="1">2030</td>
<td align="center" rowspan="1" colspan="1">0.35 ± 0.04<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">—</td>
<td align="center" rowspan="1" colspan="1">CG-SM</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Oxyde de caryophyllène</td>
<td align="center" rowspan="1" colspan="1">1581</td>
<td align="center" rowspan="1" colspan="1">2008</td>
<td align="center" rowspan="1" colspan="1">—</td>
<td align="center" rowspan="1" colspan="1">1.42 ± 0.51<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">IR. CG-SM</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">E.Z farnesyl acetate</td>
<td align="center" rowspan="1" colspan="1">1818</td>
<td align="center" rowspan="1" colspan="1">2198</td>
<td align="center" rowspan="1" colspan="1">0.57 ± 0.02<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">—</td>
<td align="center" rowspan="1" colspan="1">CG-SM</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">NI</td>
<td align="center" rowspan="1" colspan="1"> </td>
<td align="center" rowspan="1" colspan="1"> </td>
<td align="center" rowspan="1" colspan="1">0.52 ± 0.03</td>
<td align="center" rowspan="1" colspan="1">0.44 ± 0.05</td>
<td align="center" rowspan="1" colspan="1"> </td>
</tr>
</tbody>
</table>
<table-wrap-foot><fn><p><sup>A</sup>
Values are given as mean ± SD (<italic>n</italic>
= 3). Values followed by the same letter did not share significant differences at <italic>P</italic>
< 0.05 (Duncan's test). —: not detected.</p>
</fn>
<fn><p><sup>b</sup>
Components are listed in order of elution in apolar column (HP-5). </p>
</fn>
<fn><p><sup>c</sup>
RI<sup>a</sup>
, RI<sup>b</sup>
: retention indices calculated using, respectively, an apolar column (HP-5) and polar column (HP INNOWax). Volatile compound proportions were calculated from the chromatograms obtained on the HP INNOWax column. </p>
</fn>
</table-wrap-foot>
</table-wrap>
<table-wrap id="tab2" orientation="portrait" position="float"><label>Table 2</label>
<caption><p>Contents (mg/g) and percentages (%) of phenolic compounds of bitter orange peel and juice<sup>A</sup>
.</p>
</caption>
<table frame="hsides" rules="groups"><thead><tr><th align="left" rowspan="2" colspan="1">Phenolic compounds</th>
<th align="center" colspan="2" rowspan="1">Peel</th>
<th align="center" colspan="2" rowspan="1">Juice</th>
</tr>
<tr><th align="center" rowspan="1" colspan="1">%</th>
<th align="center" rowspan="1" colspan="1">Mg/g</th>
<th align="center" rowspan="1" colspan="1">%</th>
<th align="center" rowspan="1" colspan="1">Mg/L</th>
</tr>
</thead>
<tbody><tr><td align="left" rowspan="1" colspan="1">Phenolic acids</td>
<td align="center" rowspan="1" colspan="1"><bold>73.80</bold>
<bold>± 3.33</bold>
<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1"><bold>1.03</bold>
<bold>± 0.02</bold>
</td>
<td align="center" rowspan="1" colspan="1"><bold>71.25</bold>
± 0.25<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1"><bold>473.89</bold>
<bold> ± 0.30</bold>
</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Gallic acid</td>
<td align="center" rowspan="1" colspan="1">1.84 ± 0.25<sup>b</sup>
</td>
<td align="center" rowspan="1" colspan="1">0.03 ± 0.01</td>
<td align="center" rowspan="1" colspan="1"><bold>13.05</bold>
± 0.01<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">84.53 ± 0.07</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Hydroxybenzoic acid</td>
<td align="center" rowspan="1" colspan="1">1.13 ± 0.65<sup>b</sup>
</td>
<td align="center" rowspan="1" colspan="1">0.02 ± 0.01</td>
<td align="center" rowspan="1" colspan="1">4.05 ± 0.11<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">27.88 ± 0.05</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Chlorogenic acid</td>
<td align="center" rowspan="1" colspan="1">8.63 ± 0.13<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">0.12 ± 0.01</td>
<td align="center" rowspan="1" colspan="1">—</td>
<td align="center" rowspan="1" colspan="1">—</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Syringic acid</td>
<td align="center" rowspan="1" colspan="1">1.69 ± 0.46<sup>b</sup>
</td>
<td align="center" rowspan="1" colspan="1">0.02 ± 0.01</td>
<td align="center" rowspan="1" colspan="1">2.24 ± 0.00<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">13.75 ± 0.1</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Vanillic acid</td>
<td align="center" rowspan="1" colspan="1">1.75 ± 0.57<sup>b</sup>
</td>
<td align="center" rowspan="1" colspan="1">0.02 ± 0.01</td>
<td align="center" rowspan="1" colspan="1">2.61 ± 0.04<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">17.19 ± 0.01</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Rosmarinic acid</td>
<td align="center" rowspan="1" colspan="1">5.58 ± 0.65<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">0.08 ± 0.02</td>
<td align="center" rowspan="1" colspan="1">5.43 ± 0.10<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">36.84 ± 0.02</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Trans-2-hydroxycinnamic acid</td>
<td align="center" rowspan="1" colspan="1">3.15 ± 0.28<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">0.04 ± 0.01</td>
<td align="center" rowspan="1" colspan="1">4.56 ± 0.05<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">30.69 <bold>± </bold>
0.20</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Trans-cinnamic acid</td>
<td align="center" rowspan="1" colspan="1">1.56 ± 0.65<sup>b</sup>
</td>
<td align="center" rowspan="1" colspan="1">0.02 ± 0.01</td>
<td align="center" rowspan="1" colspan="1">2.58 ± 0.01<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">15.64 ± 0.09</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1"><italic>p</italic>
-Coumaric acid</td>
<td align="center" rowspan="1" colspan="1"><bold>24.68</bold>
<bold>± 2.64</bold>
<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">0.34 ± 0.01</td>
<td align="center" rowspan="1" colspan="1"><bold>18.02</bold>
± 0.22<sup>b</sup>
</td>
<td align="center" rowspan="1" colspan="1">116.13 ± 0.18 </td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Ferulic acid</td>
<td align="center" rowspan="1" colspan="1"><bold>23.79</bold>
<bold>± 3.27</bold>
<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">0.33 ± 0.02 </td>
<td align="center" rowspan="1" colspan="1"><bold>19.04</bold>
± 0.22<sup>b</sup>
</td>
<td align="center" rowspan="1" colspan="1">131.24 ± 0.21</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Flavonoids</td>
<td align="center" rowspan="1" colspan="1"><bold>23.02</bold>
<bold> ± 3.83</bold>
<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1"><bold>0.33</bold>
<bold>± 0.07</bold>
</td>
<td align="center" rowspan="1" colspan="1"><bold>23.13</bold>
± 1.11<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1"><bold>136.91</bold>
± 0.17</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Epicatechin</td>
<td align="center" rowspan="1" colspan="1">2.77 ± 0.83<sup>b</sup>
</td>
<td align="center" rowspan="1" colspan="1">0.04 ± 0.02</td>
<td align="center" rowspan="1" colspan="1">5.36 ± 0.15<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">36.47 ± 0.05</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Catechin</td>
<td align="center" rowspan="1" colspan="1">3.17 ± 0.27<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">0.04 ± 0.01</td>
<td align="center" rowspan="1" colspan="1">3.16 ± 0.08<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">20.24 ± 0.09</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Rutin</td>
<td align="center" rowspan="1" colspan="1">9.91 ± 1.18<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">0.14 ± 0.03</td>
<td align="center" rowspan="1" colspan="1">5.98 ± 0.19<sup>b</sup>
</td>
<td align="center" rowspan="1" colspan="1">37.21 ± 0.10</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Naringin</td>
<td align="center" rowspan="1" colspan="1">5.23 ± 1.15<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">0.07 ± 0.02</td>
<td align="center" rowspan="1" colspan="1">5.59 ± 0.04<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">35.05 ± 0.12</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Flavone</td>
<td align="center" rowspan="1" colspan="1">1.95 ± 1.98<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">0.03 ± 0.03</td>
<td align="center" rowspan="1" colspan="1">1.19 ± 0.01<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">7.96 ± 0.01</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Phenolic monoterpenes</td>
<td align="center" rowspan="1" colspan="1">—</td>
<td align="center" rowspan="1" colspan="1"> </td>
<td align="center" rowspan="1" colspan="1"><bold>3.51</bold>
± 0.17<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1"><bold>23.54</bold>
± 0.03</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Tyrosol</td>
<td align="center" rowspan="1" colspan="1">—</td>
<td align="center" rowspan="1" colspan="1"> </td>
<td align="center" rowspan="1" colspan="1">3.51 ± 0.17<sup>a</sup>
</td>
<td align="center" rowspan="1" colspan="1">23.54 ± 0.03</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Unknown</td>
<td align="center" rowspan="1" colspan="1">3.18 ± 0.50</td>
<td align="center" rowspan="1" colspan="1">0.04 ± 0.01</td>
<td align="center" rowspan="1" colspan="1">3.62</td>
<td align="center" rowspan="1" colspan="1">22.79 ± 0.08</td>
</tr>
<tr><td align="left" colspan="5" rowspan="1"><hr></hr>
</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Total</td>
<td align="center" rowspan="1" colspan="1">100</td>
<td align="center" rowspan="1" colspan="1">1.40 ± 0.09</td>
<td align="center" rowspan="1" colspan="1">100</td>
<td align="center" rowspan="1" colspan="1">657.13 ± 0.27</td>
</tr>
</tbody>
</table>
<table-wrap-foot><fn><p> <sup>A</sup>
Values are given as mean ± SD (<italic>n</italic>
= 3). Values followed by the same letter did not share significant differences at <italic>P</italic>
< 0.05 (Duncan's test). —: not detected.</p>
</fn>
</table-wrap-foot>
</table-wrap>
<table-wrap id="tab3" orientation="portrait" position="float"><label>Table 3</label>
<caption><p>Antioxidant activities of bitter orange peel and juice methanolic extracts<sup>A</sup>
.</p>
</caption>
<table frame="hsides" rules="groups"><thead><tr><th align="left" rowspan="1" colspan="1"> </th>
<th align="center" rowspan="1" colspan="1">Total antioxidant capacity <break></break>
(mg GAE/g FW: peel)<break></break>
(mg GAE/L: juice)</th>
<th align="center" rowspan="1" colspan="1">DPPH<break></break>
(IC<sub>50</sub>
, <italic>µ</italic>
g mL<sup>−1</sup>
: peel)<break></break>
(%<italic>I</italic>
: juice)</th>
<th align="center" rowspan="1" colspan="1">β-Carotene bleaching <break></break>
(IC<sub>50</sub>
, mg mL<sup>−1</sup>
: peel)<break></break>
(%<italic>I</italic>
: juice)</th>
<th align="center" rowspan="1" colspan="1">Reducing power <break></break>
(EC<sub>50</sub>
, mg mL<sup>−1</sup>
: peel)<break></break>
</th>
</tr>
</thead>
<tbody><tr><td align="left" rowspan="1" colspan="1">Peel</td>
<td align="center" rowspan="1" colspan="1">5.23 ± 0.05</td>
<td align="center" rowspan="1" colspan="1">190 ± 0.01</td>
<td align="center" rowspan="1" colspan="1">5.81 ± 0.03</td>
<td align="center" rowspan="1" colspan="1">1.88 ± 0.05</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Juice</td>
<td align="center" rowspan="1" colspan="1">823.13 ± 17.18</td>
<td align="center" rowspan="1" colspan="1">97.05 ± 0.38</td>
<td align="center" rowspan="1" colspan="1">15.92 ± 0.66</td>
<td align="center" rowspan="1" colspan="1">—</td>
</tr>
</tbody>
</table>
<table-wrap-foot><fn><p> <sup>A</sup>
Values are given as mean ± SD (<italic>n</italic>
= 3). —: not detected.</p>
</fn>
</table-wrap-foot>
</table-wrap>
</floats-group>
</pmc>
<affiliations><list><country><li>Tunisie</li>
</country>
</list>
<tree><country name="Tunisie"><noRegion><name sortKey="Jabri Karoui, Iness" sort="Jabri Karoui, Iness" uniqKey="Jabri Karoui I" first="Iness" last="Jabri Karoui">Iness Jabri Karoui</name>
</noRegion>
<name sortKey="Marzouk, Brahim" sort="Marzouk, Brahim" uniqKey="Marzouk B" first="Brahim" last="Marzouk">Brahim Marzouk</name>
</country>
</tree>
</affiliations>
</record>
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