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Affiner la rechercheApplication of coacervative microextraction for extraction of volatile compounds in thymus essential oil and fruit juices by gas chromatography with flame ionization detection / Fateme Kardani in The journal of essential oil research, Vol. 23 N° 6 (Novembre/Décembre 2011)
[article]
in The journal of essential oil research > Vol. 23 N° 6 (Novembre/Décembre 2011) . - pp. 61-69
Titre : Application of coacervative microextraction for extraction of volatile compounds in thymus essential oil and fruit juices by gas chromatography with flame ionization detection Type de document : texte imprimé Auteurs : Fateme Kardani, Auteur ; Ali Daneshfar, Auteur ; Reza Sahrae, Auteur Année de publication : 2012 Article en page(s) : pp. 61-69 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Coacervative Microextraction Thymus Fruit juices GC-FID Index. décimale : 646 Résumé : In this work, extraction of volatile compound in thymus essential oil and fruit juice samples was followed using coacervative microextraction technique by gas chromatography with flame ionization detection (GC-FID). Oleic acid (10 pL) was dissolved in THF (3.5 mL) in 10 mL volumetric flask. Aqueous sample (6.5 mL) containing analytes and internal standard was added to give a final volume of 10 mL. The coacervate formed instantaneously, two phases were separated by centrifugation. The analytes in the coacervate phase was determined by the gas chromatograph. The influence of several important parameters on extraction efficiency was evaluated. Under optimized experimental conditions, the calibration graphs were linear in the range of 0.5–30.0 mg/L with coefficient of determination more than 0.994 for all analytes. The limits of detection values were in the range of 0.13–0.31 mg/L. The limit of quantification values were in the range of 0.42–1.03 mg/L. This procedure was successfully applied with satisfactory results to the determination of α-pinene, β-myrcene, camphene, limonene, limonene-oxide, linalool, and borneol in spiked samples. The relative recoveries of samples ranged from 71.6 % to 116.0 %, with relative standard deviations varying from 1.7 % to 7.8%. DEWEY : 665 ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/abs/10.1080/10412905.2011.9712284 [article] Application of coacervative microextraction for extraction of volatile compounds in thymus essential oil and fruit juices by gas chromatography with flame ionization detection [texte imprimé] / Fateme Kardani, Auteur ; Ali Daneshfar, Auteur ; Reza Sahrae, Auteur . - 2012 . - pp. 61-69.
Génie Chimique
Langues : Anglais (eng)
in The journal of essential oil research > Vol. 23 N° 6 (Novembre/Décembre 2011) . - pp. 61-69
Mots-clés : Coacervative Microextraction Thymus Fruit juices GC-FID Index. décimale : 646 Résumé : In this work, extraction of volatile compound in thymus essential oil and fruit juice samples was followed using coacervative microextraction technique by gas chromatography with flame ionization detection (GC-FID). Oleic acid (10 pL) was dissolved in THF (3.5 mL) in 10 mL volumetric flask. Aqueous sample (6.5 mL) containing analytes and internal standard was added to give a final volume of 10 mL. The coacervate formed instantaneously, two phases were separated by centrifugation. The analytes in the coacervate phase was determined by the gas chromatograph. The influence of several important parameters on extraction efficiency was evaluated. Under optimized experimental conditions, the calibration graphs were linear in the range of 0.5–30.0 mg/L with coefficient of determination more than 0.994 for all analytes. The limits of detection values were in the range of 0.13–0.31 mg/L. The limit of quantification values were in the range of 0.42–1.03 mg/L. This procedure was successfully applied with satisfactory results to the determination of α-pinene, β-myrcene, camphene, limonene, limonene-oxide, linalool, and borneol in spiked samples. The relative recoveries of samples ranged from 71.6 % to 116.0 %, with relative standard deviations varying from 1.7 % to 7.8%. DEWEY : 665 ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/abs/10.1080/10412905.2011.9712284 Aroma enhancement and characterization of the absolute osmanthus fragrans lour. / Wei-Rong Yao in The journal of essential oil research, Vol. 22 N° 2 (Mars/Avril 2010)
[article]
in The journal of essential oil research > Vol. 22 N° 2 (Mars/Avril 2010) . - pp. 97-102
Titre : Aroma enhancement and characterization of the absolute osmanthus fragrans lour. Type de document : texte imprimé Auteurs : Wei-Rong Yao, Auteur ; Yin-Zhu Zhang, Auteur ; Yi Chen, Auteur Article en page(s) : pp. 97-102 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Osmanthus fragrans Oleaceae Absolute composition Glycosidically bound volatiles Megastigma-4,6(E) 8(E)-triene Dihydro-β-ionol (E)-β-ionone Index. décimale : 646 Résumé : In this paper, β-glucosidase hydrolysis approach was applied on Osmanthus fragrans Lour. flowers for the aroma enhancement of the extract.
The hydrolysis and extraction conditions, including enzyme amount, temperature, time, rate of agitation, buffer pH, buffer volume, extraction time, extraction temperature and petroleum ether volume, were optimized.
The crude extract (concrete) and refined extract (absolute) under optimum conditions had increased yields of 0.42% and 0.25%, which were 147.1% and 177.8%, respectively, as compared with the procedure without the β-glucosidase hydrolysis.
Analyses showed no obvious qualitative differences in the volatiles produced with and without enzymatic hydrolysis.
However, the amount of typical aroma components significantly increased in the hydrolysis sample.
As compared with the no-hydrolysis control, the first four aroma components with the most increase were 6,10,14-trimethyl-2-pentadecan-2-one, nonanal, dihydro-β-ionol and (E)-β-ionone in the hydrolysis sample.
Megastigma-4,6(E),8(E)-triene was only found in the hydrolysis sample, but the amount of trans-linalool oxide, cis-linalool oxide and dihydro-3-oxo-ionol decreased.
Organoleptic assessment supported that the hydrolysis sample produced a stronger fragrance.DEWEY : 665 ISSN : 1041-2905 En ligne : http://www.jeoronline.com/archive/detail/50 [article] Aroma enhancement and characterization of the absolute osmanthus fragrans lour. [texte imprimé] / Wei-Rong Yao, Auteur ; Yin-Zhu Zhang, Auteur ; Yi Chen, Auteur . - pp. 97-102.
Génie Chimique
Langues : Anglais (eng)
in The journal of essential oil research > Vol. 22 N° 2 (Mars/Avril 2010) . - pp. 97-102
Mots-clés : Osmanthus fragrans Oleaceae Absolute composition Glycosidically bound volatiles Megastigma-4,6(E) 8(E)-triene Dihydro-β-ionol (E)-β-ionone Index. décimale : 646 Résumé : In this paper, β-glucosidase hydrolysis approach was applied on Osmanthus fragrans Lour. flowers for the aroma enhancement of the extract.
The hydrolysis and extraction conditions, including enzyme amount, temperature, time, rate of agitation, buffer pH, buffer volume, extraction time, extraction temperature and petroleum ether volume, were optimized.
The crude extract (concrete) and refined extract (absolute) under optimum conditions had increased yields of 0.42% and 0.25%, which were 147.1% and 177.8%, respectively, as compared with the procedure without the β-glucosidase hydrolysis.
Analyses showed no obvious qualitative differences in the volatiles produced with and without enzymatic hydrolysis.
However, the amount of typical aroma components significantly increased in the hydrolysis sample.
As compared with the no-hydrolysis control, the first four aroma components with the most increase were 6,10,14-trimethyl-2-pentadecan-2-one, nonanal, dihydro-β-ionol and (E)-β-ionone in the hydrolysis sample.
Megastigma-4,6(E),8(E)-triene was only found in the hydrolysis sample, but the amount of trans-linalool oxide, cis-linalool oxide and dihydro-3-oxo-ionol decreased.
Organoleptic assessment supported that the hydrolysis sample produced a stronger fragrance.DEWEY : 665 ISSN : 1041-2905 En ligne : http://www.jeoronline.com/archive/detail/50 Aromas from Quebec. II. composition of the essential oil of the rhizomes and roots of asarum canadense L. / André Bélanger in The journal of essential oil research, Vol. 22 N° 2 (Mars/Avril 2010)
[article]
in The journal of essential oil research > Vol. 22 N° 2 (Mars/Avril 2010) . - pp. 164 - 169
Titre : Aromas from Quebec. II. composition of the essential oil of the rhizomes and roots of asarum canadense L. Type de document : texte imprimé Auteurs : André Bélanger, Auteur ; Guy Collin, Auteur ; François-Xavier Garneau, Auteur Année de publication : 2010 Article en page(s) : pp. 164 - 169 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Asarum canadense Aristolochiaceae Essential oil composition Methyl eugenol (E)-isoelemicin Linalool Junenol Methoxylated elemicin Hydroxy elemicin isomers Index. décimale : 646 Résumé : The fresh rhizomes and roots of Asarum canadense were steam-distilled to yield oils in 1.30% to 1.96%, respectively.
The oils were analyzed by a combination of GC-FID and GC/MS techniques.
In the case of the rhizome oil, the total amount of phenyl ethers including methyl eugenol, elemicins, and asaricin was about 58%.
In the root oil, (E)-isoelemicin was the major product (20%) accompanied by elemicin (4.9%).
From retention indices on both non-polar and polar columns and MS considerations, it may be inferred that methoxy-elemicin and both (E)- and (Z)-methoxy-isoelemicin as well as the new hydroxyl derivatives: hydroxyl-elemicin and (E)- and (Z)-hydroxy-isoelemicins were characterized in the oils.DEWEY : 665 ISSN : 1041-2905 En ligne : http://www.jeoronline.com/archive/detail/50 [article] Aromas from Quebec. II. composition of the essential oil of the rhizomes and roots of asarum canadense L. [texte imprimé] / André Bélanger, Auteur ; Guy Collin, Auteur ; François-Xavier Garneau, Auteur . - 2010 . - pp. 164 - 169.
Génie Chimique
Langues : Anglais (eng)
in The journal of essential oil research > Vol. 22 N° 2 (Mars/Avril 2010) . - pp. 164 - 169
Mots-clés : Asarum canadense Aristolochiaceae Essential oil composition Methyl eugenol (E)-isoelemicin Linalool Junenol Methoxylated elemicin Hydroxy elemicin isomers Index. décimale : 646 Résumé : The fresh rhizomes and roots of Asarum canadense were steam-distilled to yield oils in 1.30% to 1.96%, respectively.
The oils were analyzed by a combination of GC-FID and GC/MS techniques.
In the case of the rhizome oil, the total amount of phenyl ethers including methyl eugenol, elemicins, and asaricin was about 58%.
In the root oil, (E)-isoelemicin was the major product (20%) accompanied by elemicin (4.9%).
From retention indices on both non-polar and polar columns and MS considerations, it may be inferred that methoxy-elemicin and both (E)- and (Z)-methoxy-isoelemicin as well as the new hydroxyl derivatives: hydroxyl-elemicin and (E)- and (Z)-hydroxy-isoelemicins were characterized in the oils.DEWEY : 665 ISSN : 1041-2905 En ligne : http://www.jeoronline.com/archive/detail/50 Aromatic plants of french polynesia. IV. composition and chemical variations of the essential oils of leaves of etlingera cevuga (Seeman) R.E. smith / I. Vahirua-Lechat in The journal of essential oil research, Vol. 22 N° 5 (Septembre/Octobre 2010)
[article]
in The journal of essential oil research > Vol. 22 N° 5 (Septembre/Octobre 2010) . - pp. 407-409
Titre : Aromatic plants of french polynesia. IV. composition and chemical variations of the essential oils of leaves of etlingera cevuga (Seeman) R.E. smith Type de document : texte imprimé Auteurs : I. Vahirua-Lechat, Auteur ; Y. Mitermite, Auteur ; C. Menut, Auteur Année de publication : 2011 Article en page(s) : pp. 407-409 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Etlingera cevuga Zingiberaceae Essential oil composition Methyl eugenol (E)-methyl isoeugenol Index. décimale : 646 Résumé : The chemical variation of the essential oils of leaves of Etlingera cevuga collected in three locations of the island of Tahiti were studied by capillary gas chromatography and combined GC/MS. The chemical profile of the oils remains relatively constant where methyl eugenol (40.9–45.7%), (E)-methyl isoeugenol (8.6–16.5%), (Z)-methyl isoeugenol (0.8–1.5%) and eugenol (3.6–8.4%) accounted together for more than 55% of the oil. DEWEY : 665 ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/abs/10.1080/10412905.2010.9700357 [article] Aromatic plants of french polynesia. IV. composition and chemical variations of the essential oils of leaves of etlingera cevuga (Seeman) R.E. smith [texte imprimé] / I. Vahirua-Lechat, Auteur ; Y. Mitermite, Auteur ; C. Menut, Auteur . - 2011 . - pp. 407-409.
Génie Chimique
Langues : Anglais (eng)
in The journal of essential oil research > Vol. 22 N° 5 (Septembre/Octobre 2010) . - pp. 407-409
Mots-clés : Etlingera cevuga Zingiberaceae Essential oil composition Methyl eugenol (E)-methyl isoeugenol Index. décimale : 646 Résumé : The chemical variation of the essential oils of leaves of Etlingera cevuga collected in three locations of the island of Tahiti were studied by capillary gas chromatography and combined GC/MS. The chemical profile of the oils remains relatively constant where methyl eugenol (40.9–45.7%), (E)-methyl isoeugenol (8.6–16.5%), (Z)-methyl isoeugenol (0.8–1.5%) and eugenol (3.6–8.4%) accounted together for more than 55% of the oil. DEWEY : 665 ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/abs/10.1080/10412905.2010.9700357 Aromatic plants of french polynesia. V. chemical composition of essential oils of leaves of psidium guajava L. and psidium cattleyanum sabine / F. Adam in The journal of essential oil research, Vol. 23 N° 1 (Janvier/Fevrier 2011)
[article]
in The journal of essential oil research > Vol. 23 N° 1 (Janvier/Fevrier 2011) . - pp. 98 - 101
Titre : Aromatic plants of french polynesia. V. chemical composition of essential oils of leaves of psidium guajava L. and psidium cattleyanum sabine Type de document : texte imprimé Auteurs : F. Adam, Auteur ; I. Vahirua-Lechat, Auteur ; E. Deslandes, Auteur Année de publication : 2011 Article en page(s) : pp. 98 - 101 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Psidium guajava Psidium cattleyanum Myrtaceae Essential oil composition b-caryophyllene Index. décimale : 646 Résumé : The leaf oils of Psidium guajava and Psidium catlleyanum collected in French Polynesia have been examined for the first time in Tahiti by GC and combined GC/MS.
The leaf oil of P. guajava contained a mixture of sesquiterpene hydrocarbons (54.9%) and oxygenated sesquiterpenes (20.9%) with b-caryophyllene (18.3%) as the principal sesquiterpene hydrocarbon and selin-11-en-4a-ol (6.9%), a-cadinol (3.6%), (E)-nerolidol (3.2%) as the main oxygenated sesquiterpenes.
Psidium cattleyanum produced oil that was much richer in sesquiterpene hydrocarbons (48.8%) and monoterpene hydrocarbons (10.1%). The main sesquiterpenes present in the oil were b-caryophyllene (31.5%) and a-humulene (4.4%).
The two oils also contained a small amount of aromatic compounds, benzaldehyde (2.4%) in P. guajava oil, and the two isomers (E)-methyl isoeugenol (0.6%) and (Z)-methyl-isoeugenol (0.1%) in P. cattleyanum oil.DEWEY : 665 ISSN : 1041-2905 En ligne : http://www.jeoronline.com/archive/detail/55 [article] Aromatic plants of french polynesia. V. chemical composition of essential oils of leaves of psidium guajava L. and psidium cattleyanum sabine [texte imprimé] / F. Adam, Auteur ; I. Vahirua-Lechat, Auteur ; E. Deslandes, Auteur . - 2011 . - pp. 98 - 101.
Génie Chimique
Langues : Anglais (eng)
in The journal of essential oil research > Vol. 23 N° 1 (Janvier/Fevrier 2011) . - pp. 98 - 101
Mots-clés : Psidium guajava Psidium cattleyanum Myrtaceae Essential oil composition b-caryophyllene Index. décimale : 646 Résumé : The leaf oils of Psidium guajava and Psidium catlleyanum collected in French Polynesia have been examined for the first time in Tahiti by GC and combined GC/MS.
The leaf oil of P. guajava contained a mixture of sesquiterpene hydrocarbons (54.9%) and oxygenated sesquiterpenes (20.9%) with b-caryophyllene (18.3%) as the principal sesquiterpene hydrocarbon and selin-11-en-4a-ol (6.9%), a-cadinol (3.6%), (E)-nerolidol (3.2%) as the main oxygenated sesquiterpenes.
Psidium cattleyanum produced oil that was much richer in sesquiterpene hydrocarbons (48.8%) and monoterpene hydrocarbons (10.1%). The main sesquiterpenes present in the oil were b-caryophyllene (31.5%) and a-humulene (4.4%).
The two oils also contained a small amount of aromatic compounds, benzaldehyde (2.4%) in P. guajava oil, and the two isomers (E)-methyl isoeugenol (0.6%) and (Z)-methyl-isoeugenol (0.1%) in P. cattleyanum oil.DEWEY : 665 ISSN : 1041-2905 En ligne : http://www.jeoronline.com/archive/detail/55 Aromatic plants of northwest Argentina. Constituents of the essential oils of aerial parts of seven Verbenaceae / José S. Dambolena in The journal of essential oil research, Vol. 22 N° 4 (Juillet/Août 2010)
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