Publications (17)35.96 Total impact
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Article: Fragrant volatile compounds in the liverwort Drepanolejeunea madagascariensis (Steph.) Grolle: approach by the HS-SPME technique.
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ABSTRACT: Three populations of the epiphyllous liverwort Drepanolejeunea madagascariensis collected in the cloud forests of Reunion Island (Mascarene Archipelago) were investigated for their volatile compounds, because of the pleasant, sweet, warm, woody-spicy, and herbaceous fragrance, slightly reminiscent of dill, of this species. By applying the headspace solid-phase microextraction (HS-SPME) technique coupled to GC/MS analysis, 34 compounds were detected in total, with p-menth-1-en-9-ol (28.8-43.5%), limonene (10.5-14.7%), beta-phellandrene (8.8-11.6%), and the so-called dill ether (8.5-16.6%) as the main components. The presence of 1-epi-alpha-pinguisene confirms the possible use of pinguisane-type sesquiterpenoids as a characteristic chemical marker for the order Jungermanniales.Chemistry & Biodiversity 03/2010; 7(3):639-48. · 1.80 Impact Factor -
Article: Volatile compounds from Melicope obscura.
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ABSTRACT: To evaluate the interpopulation variability of volatile compounds in Melicope obscura, four samples representing four populations were collected all over the distribution area of the species in Reunion Island (Indian Ocean). The samples were extracted by hydrodistillation, and analyzed using GC/FID and GC/MS techniques. The study revealed that, in the four essential oils obtained, oxygenated sesquiterpenes were one of the major chemical classes (9.2-35.2%), mainly consisting of a new compound, (+)-6-ethenyl-2-hydroxy-6,10-dimethylundeca-2,9-dien-4-one (1), called melicopenol (8.6-30.1%). The compound was isolated by column chromatography and identified by spectral analyses including 1D- and 2D-NMR.Chemistry & Biodiversity 02/2010; 7(2):467-75. · 1.80 Impact Factor -
Article: 24-O-ethylmanoalide, a manoalide-related sesterterpene from the marine sponge Luffariella cf. variabilis.
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ABSTRACT: A new manoalide-related sesterterpene, 24-O-ethylmanoalide (3), was isolated from the Indian Ocean sponge Luffariella cf. variabilis, together with the known compounds manoalide (1), seco-manoalide, manoalide monoacetate and 24-O-methylmanoalide (2). The structure of compound 3 was elucidated by interpretation of its spectroscopic data.Molecules 02/2008; 13(12):3184-91. · 2.39 Impact Factor -
Article: Comparison of the concentrations of phenolic constituents in cane sugar manufacturing products with their antioxidant activities.
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ABSTRACT: Polyphenol content and free radical scavenging capacity of seven kinds of sugar manufacturing products (A sugars, clear juices, syrups, massecuite, and A, B, and C molasses) were studied. Seventy-two samples were collected at different stages of the process during two sugar harvests from a local sugar factory (Bois-Rouge, La Réunion). The total phenolic content of sugar products was determined according to the Folin-Ciocalteu assay. Polyphenols of sugar products were extracted with ethyl acetate and quantified by LC-UV-ESI-MS during all of the process. ABTS and DPPH assays were applied to aqueous solution of sugar products, which exhibited interesting free radical scavenging activity. Comparatively, ethyl acetate extracts exhibited higher antioxidant activity. Multivariate analyses (principal component analysis and canonical discriminant analysis) demonstrated a significant correlation between polyphenols and antioxidant activity. Moreover, it was observed that the sugar process results in an increase of the phenolic content and the free radical scavenging capacity of the different products. These products and especially molasses proved to be a rich source of natural antioxidants and may represent an interesting alternative to synthetic food antioxidants.Journal of Agricultural and Food Chemistry 10/2006; 54(19):7270-6. · 2.82 Impact Factor -
Article: An improved microwave Clevenger apparatus for distillation of essential oils from orange peel.
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ABSTRACT: Microwave Clevenger or microwave accelerated distillation (MAD) is a combination of microwave heating and distillation, performed at atmospheric pressure without added any solvent or water. Isolation and concentration of volatile compounds are performed by a single stage. MAD extraction of orange essential oil was studied using fresh orange peel from Valencia late cultivar oranges as the raw material. MAD has been compared with a conventional technique, which used a Clevenger apparatus with hydro-distillation (HD). MAD and HD were compared in term of extraction time, yields, chemical composition and quality of the essential oil, efficiency and costs of the process. Extraction of essential oils from orange peels with MAD was better in terms of energy saving, extraction time (30 min versus 3 h), oxygenated fraction (11.7% versus 7.9%), product yield (0.42% versus 0.39%) and product quality. Orange peels treated by MAD and HD were observed by scanning electronic microscopy (SEM). Micrographs provide evidence of more rapid opening of essential oil glands treated by MAD, in contrast to conventional hydro-distillation.Journal of Chromatography 05/2006; 1112(1-2):121-6. · 4.53 Impact Factor -
Article: Assessment of antioxidant activity of cane brown sugars by ABTS and DPPH radical scavenging assays: determination of their polyphenolic and volatile constituents.
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ABSTRACT: Seven cane brown sugars (four from La Réunion, two from Mauritius, and one from France) were investigated for their polyphenol content and volatile composition in relation to their free radical scavenging capacity determined by ABTS and DPPH assays. The thin layer coated on the sugar crystal was extracted by Soxhlet extractor with dichloromethane. The volatile compounds of brown sugars were studied by GC-MS, and 43 compounds were identified. The total phenolic content of brown sugars was determined according to the Folin-Ciocalteu method. Phenolic compounds were quantified in the brown sugar extracts by LC-UV-ESI-MS. Brown sugar aqueous solutions exhibited weak free radical scavenging activity in the DPPH assay and higher antioxidant activity in the ABTS assay at relatively high concentration. The brown sugar extracts showed interesting free radical scavenging properties despite the low concentration of phenolic and volatile compounds. Sugar is a common foodstuff traditionally used for its sweetening properties, which might be accompanied by antioxidant properties arising from molecules (polyphenols, Maillard products) other than sucrose of the cane brown sugars.Journal of Agricultural and Food Chemistry 01/2006; 53(26):10074-9. · 2.82 Impact Factor -
Article: Volatile constituents of five Citrus Petitgrain essential oils from Reunion
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ABSTRACT: The Petitgrain essential oils of Citrus latifolia Tanaka (two varieties, Lime Tahiti and Lime de Perse) and Citrus limon (L.) Burm.f. (three varieties, Meyer, Eureka, Doux), Family Rutaceae, from Reunion Island (Indian Ocean) have been analysed by GC–MS. Some major components found on Supelcowax column are β-pinene, sabinene, limonene, citronellal, linalool, neral, geranial and neryl acetate, in different amounts according to variety. The chemical composition of each variety is responsible for the typical olfactory notes. Copyright © 2005 John Wiley & Sons, Ltd.Flavour and Fragrance Journal 05/2005; 20(4):399 - 402. · 1.42 Impact Factor -
Article: Solvent-free microwave extraction of essential oil from aromatic herbs: comparison with conventional hydro-distillation.
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ABSTRACT: Solvent-free microwave extraction (SFME) is a combination of microwave heating and dry distillation, performed at atmospheric pressure without added any solvent or water. Isolation and concentration of volatile compounds are performed by a single stage. SFME has been compared with a conventional technique, hydro-distillation (HD), for the extraction of essential oil from three aromatic herbs: basil (Ocimum basilicum L.), garden mint (Mentha crispa L.), and thyme (Thymus vulgaris L.). The essential oils extracted by SFME for 30min were quantitatively (yield) and qualitatively (aromatic profile) similar to those obtained by conventional hydro-distillation for 4.5 h. The SFME method yields an essential oil with higher amounts of more valuable oxygenated compounds, and allows substantial savings of costs, in terms of time, energy and plant material. SFME is a green technology and appears as a good alternative for the extraction of essential oils from aromatic plants.Journal of Chromatography 08/2004; 1043(2):323-7. · 4.53 Impact Factor -
Article: An acetylated monoterpene and a sesquiterpene alcohol from Psiadia anchusifolia.
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ABSTRACT: Two compounds identified as 7,7-dimethyl-2-methylenebicyclo[3.1.1]heptan-6-ol acetate and 6,6,8,9-tetramethyltricyclo[3.3.3.0]undec-7-en-2-ol were isolated from the essential oil of the fresh leaves of Psiadia anchusifolia. Their structures were determined by extensive NMR studies (1H NMR, 13C NMR, DEPT, 1H-1H COSY, HSQC, HMBC) as well as by X-ray crystallographic analysis.Phytochemistry 05/2004; 65(7):897-901. · 3.35 Impact Factor -
Article: Sterol composition and chemotaxonomic considerations in relation to sponges of the genus Xestospongia
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ABSTRACT: The sterol composition of Xestospongia sp. (class Demospongiae, order Petrosiida, family Petrosiidae) from Mayotte (Indian Ocean), was analysed by GC and GC–MS. The sponge contained mainly C27, C28 and C29 Δ5 conventional sterols and in minor amounts Δ0 analogues with saturated and unsaturated side chains. This sterol pattern was compared with those of other members of the genus Xestospongia cited in the literature.Biochemical Systematics and Ecology 04/2004; 32(5):469-476. · 0.93 Impact Factor -
Article: Comparative investigations of the essential oils of two scented geranium (Pelargonium spp.) cultivars grown on Reunion Island
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ABSTRACT: The essential oils of two scented geranium (Pelargonium spp.) cultivars grown on Reunion Island were investigated by GC–MS. The specific odour attributes of each single constituent were correlated with the olfactory impression of the two essential oils. The scent of the essential oil extracted from the well-known rose-scented geranium cultivar, Pelargonium cv. Rosé, is based on the rosy, fruity, minty and faintly citrusy aromas of the main components, citronellol (21.9%), geraniol (18.3%), linalool (16.0%), citronellyl formate (11.6%) and isomenthone (7.6%), accompanied by minor compounds of olfactory significance, including geranyl formate (4.0%), nerol (1.7%), geranyl tiglate (1.6%) and neryl propanoate (1.5%) in particular. The volatile constituents of the essential oil of a second geranium cultivar (Pelargonium sp.) are dominated by monoterpene hydrocarbons, of which the most abundant is p-cymene (35.8%). This oil possesses a very unusual, although very pleasant, ‘citrusy-peppery-spicy’ and herbaceous scent, somewhat pungent, which is rather reminiscent of thyme. Chemotaxonomic considerations about the genus Pelargonium are also discussed. Copyright © 2004 John Wiley & Sons, Ltd.Flavour and Fragrance Journal 04/2004; 19(5):455 - 460. · 1.42 Impact Factor -
Article: Comparative analysis by gas chromatography-mass spectrometry of the essential oils from bark and leaves of Cedrelopsis grevei Baill, an aromatic and medicinal plant from Madagascar.
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ABSTRACT: The essential oils from bark and leaves of Cedrelopsis grevei Baill (Ptaeroxylaceae), an aromatic and medicinal plant from Madagascar, are widely used in folk medicine. These two commercially available oils have been examined separately by means of GC-MS. The oil constituents were identified according to their mass spectra and their relative retention indices determined on both polar and non-polar stationary phase capillary columns. A total of 55 compounds have been identified constituting 76.7% (bark) and 91.6% (leaves) of the volatile constituents. Both oils were found to have a similar composition; however the relative percentages of some compounds notably differed. The bark essential oil contained beta-pinene (17.1%), cis-sesquisabinene hydrate (12.8%) and caryophyllene oxide (7.0%) as the main components whereas the leaf essential oil was largely dominated by trans-beta-farnesene (35.6%); beta-pinene (12.8%), cis-sesquisabinene hydrate (9.8%) and ar-curcumene (8.6%) were also present as major components. As far as we know, this is the first report on the Cedrelopsis grevei bark and leaf essential oils which therapeutic properties may be attractive for aromatherapy.Journal of Chromatography 04/2004; 1029(1-2):279-82. · 4.53 Impact Factor -
Article: An original solvent free microwave extraction of essential oils from spices
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ABSTRACT: Attention is drawn to the development of a new and green alternative technique for the extraction of essential oils from spices. Solvent-free microwave extraction (SFME) is a combination of dry distillation and microwave heating without added any solvent or water. SFME and hydrodistillation (HD) were compared for the extraction of essential oil from three spices: ajowan (Carum ajowan, Apiaceae), cumin (Cuminum cyminum, Umbelliferae), star anise (Illicium anisatum, Illiciaceae). Better results have been obtained with the proposed method in terms of rapidity (1 h vs. 8 h), efficiency and no solvent used. Furthermore, the SFME procedure yielded essential oils that could be analysed directly without any preliminary clean-up or solvent exchange steps. Copyright © 2004 John Wiley & Sons, Ltd.Flavour and Fragrance Journal 02/2004; 19(2):134 - 138. · 1.42 Impact Factor -
Article: Solvent-free microwave extraction : an innovative tool for rapid extraction of essential oil from aromatic herbs and spices.
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ABSTRACT: A relatively simple apparatus is described for extracting essential oils from aromatic plant material by atmospheric solvent-free microwave extraction (SFME) without the addition of any solvent or water. Isolation and concentration of volatile compounds were performed by a single stage. The product solutions of volatile compounds were directly analyzed by gas chromatography coupled to mass spectrometry (GC-MS). The essential oils fiom aromatic herbs (basil, crispate mint, thyme) and spices (ajowan, cumin, star anise) extracted by SFME for 30 minutes and I hour, were similar to those obtained by conventional hydro-distillation (HD)for (respectively) 4 and 8 hours. Substantially higher amounts of oxygenated compounds and lower amounts of monoterpenes hydrocarbons are present in the essential oils of the aromatic plants extracted by SFME in comparison with HD. Solvent-free microwave extraction is clearly advantageous to conventional distillation in terms of rapidity, efficiency, cleanliness, substantial saving of energy, and is environmentally friendly.The Journal of microwave power and electromagnetic energy: a publication of the International Microwave Power Institute 02/2004; 39(3-4):135-9. -
Article: Isolation of bioactive 5α,8α-epidioxy sterols from the marine sponge Luffariella cf. variabilis
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ABSTRACT: The lipid ext. of the marine sponge Luffariella cf. variabilis from Mayotte (Indian Ocean) has proven to be an extraordinarily rich source of a wide variety of unusual steroids belonging to the 5α,8α-epidioxy sterol family. Ten epidioxy sterols have been identified: 5α,8α-epidioxycholesta-6,22-dien-3β-ol, 5α,8α-epidioxycholest-6-en-3β-ol, 5α,8α-epidioxy-24(ξ)-methylcholesta-6,22-dien-3β-ol, 5α,8α-epidioxy-24(S)-methylcholest-6-en-3β-ol and its epimer (24R), 5α,8α-epidioxy-24(S)-ethylcholesta-6,22-dien-3β-ol and its epimer (24R), 5α,8α-epidioxy-24(S)-ethylcholest-6-en-3β-ol and its epimer (24R), along with 5α,8α-epidioxy-24(ξ)-methylcholesta-6,9(11),22-trien-3β-ol. Their structures were detd. by NMR (1H, 13C) and electron impact mass spectrometry. The mixt. of the 10 steroids showed inhibitive activity against the human T-cell leukemia/lymphotropic virus type I (HTLV-I) and also displayed cytotoxic activity against the human breast cancer cell line (MCF7WT). [on SciFinder(R)]Canadian Journal of Chemistry 01/2000; 78:986-992. · 1.24 Impact Factor -
Article: Cyclopropane-containing sterols in the marine sponge Petrosia spheroida
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ABSTRACT: The sterols of the sponge Petrosia spheroida collected in the Indian Ocean, were isolated by liq. chromatog. and reverse-phase HPLC. Sterols were characterized by GC, GC-MS and in some cases by 1H- and 13C-NMR. P. spheroida contained seven Δ5-unsatd. steroids with various C8-C10 side chains including petrosterol and 23,24-dihydrocalysterol, two cyclopropane-contg. sterols. Chemotaxonomic considerations about the genus Petrosia are discussed. [on SciFinder(R)]Comparative biochemistry and physiology. B, Comparative biochemistry 01/1998; 121B:451-456. -
Article: Essential oil composition of four Psiadia species from Reunion Island: A chemotaxonomic study
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ABSTRACT: The essential oils of four wild species of Psiadia (Psiadia anchusifolia, Psiadia argentea, Psiadia boivinii, Psiadia salaziana; Asteraceae) endemic to Reunion Island were obtained by hydrodistillation and subjected to detailed GC/MS analysis in order to determine possible similarities among them and also the differences in their chemical compositions depending on the stage of the life cycle (vegetative and flowering). A total of 57 compounds were identified including two unusual components 7,7-dimethyl-2-methylenebicyclo[3.3.1]heptan-6-ol acetate (1) and 6,6,8,9-tetramethyltricyclo[3.3.3.0]-undec-7-en-2-ol (2) which, until now, have been found only in species of the genus Psiadia. For P. anchusifolia, P. argentea and P. salaziana, the qualitative and quantitative composition of the oils appeared to be constant in the different stages of their development. In contrast, considerable differences were found to exist in the composition of essential oils of P. boivinii.Biochemical Systematics and Ecology 33(7):705-714. · 0.93 Impact Factor
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Institutions
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2004–2008
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University of La Réunion
- Faculté des Sciences et Technologies
Saint-Denis, RE, Réunion
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