Browsing by Autor "Javier Bernardo Lopez Arze"

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Essential Oils from Bolivia II. Asteraceae:Ophryosporus heptanthus(Wedd.) H. Rob. et King
(Taylor & Francis, 2004) Javier Bernardo Lopez Arze; Guy J. Collin; François-Xavier Garneau; France-Ida Jean; Hélène Gagnon
Abstract The essential oil of the aerial parts of Ophryosporus heptanthus (Asteraceae) from Bolivia was analyzed by GC and GC/MS. The oil was characterized by a high percentage of santolinatriene (∼ 47%) and the presence of precocene II (∼ 8%) as the most important minor constituent. The other compounds were monoterpenes (∼ 16%), with p-cymene as the major compound (∼ 4.8%), sesquiterpenes (∼ 6%), oxygenated sesquiterpenes (∼ 8%) and oxygenated monoterpenes (∼ 4.5%). Key Word Index: Ophryosporus heptanthus Asteraceaeessential oil compositionsantolinatriene6,7-dimethoxy-2,2-(2H)-benzopyranprecocene II
Essential Oils from Bolivia. I. Asteraceae:Baccharis tricuneata(L.f.) Pers. var.ruizianaCuatrecassas
(Taylor & Francis, 2004) Javier Bernardo Lopez Arze; François-Xavier Garneau; Guy J. Collin; France-Ida Jean; Hélène Gagnon
Abstract The essential oil of the aerial parts of Baccharis tricuneata var. ruiziana (Asteraceae) from Bolivia was analyzed by GC and GC/MS. The oil is characterized by a high percentage of (E)-nerolidol (∼68%) and the presence of several minor constituents composed mainly of monoterpenes (∼16%), followed by sesquiterpene hydrocarbons (∼5%) and oxygenated sesquiterpenes (∼3%).
Essential Oils from Bolivia. III. Asteraceae:Artemisia copaPhilippi
(Taylor & Francis, 2004) Javier Bernardo Lopez Arze; Guy J. Collin; François-Xavier Garneau; France-Ida Jean; Hélène Gagnon
Abstract The chemical composition of the essential oil obtained from Artemisia copa growing in the high valley region of Bolivia, Province of Cochabamba, was determined by a combination of GC and GC/MS measurements. The main constituents were β-thujone (42%), chamazulene (6.5%) and a homoterpene (6.0%) as well as limonene (5%) and α-pinene (4.8%).
Essential Oils from Bolivia. IV. Compositae:Tagetes aff. maximaKuntze andTagetes multifloraH.B.K.
(Taylor & Francis, 2005) André Pichette; F.-X. Garneau; Guy J. Collin; France-Ida Jean; Hélène Gagnon; Javier Bernardo Lopez Arze
Abstract The chemical composition of the essential oils of two species of Tagetes growing wild in Bolivia was investigated. We found in the oil of T. aff. maxima (Z)-tagetone (31%), dihydrotagetone (27%) and (E)-ocimenone (22%). The oil of T. multiflora contained as major components (Z)-tagetone (47%), (E)-ocimenone (17%) and (Z)-β-ocimene (13%).
Essential Oils from Bolivia. IX. Asteraceae:Plazia daphnoidesWedd
(Taylor & Francis, 2008) Javier Bernardo Lopez Arze; Guy J. Collin; François-Xavier Garneau; France-Ida Jean; Hélène Gagnon
Abstract The chemical composition of the essential oil obtained from Plazia daphnoides growing in the High Valley Region of Bolivia, Province of Cochabamba, was determined by a combination of GC and GC-MS measurements. The composition of the oil was dominated by oxygenated sesquiterpenes (33 %) and sesquiterpenes (30 %): T-cadinol and β-caryophyllene were the main components (10–11% each) followed by epi-α-bisabolol (9 %). Oxygenated monoterpenes accounted for 14 % and monoterpenes for 11%.
Essential Oils from Bolivia. VI. Lamiaceae:Lepechinia graveolens(Reg.) EplingL. floribunda(Benth.) Epling, andL. meyeni(Walp.) Epling
(Taylor & Francis, 2009) Javier Bernardo Lopez Arze; Guy J. Collin; François-Xavier Garneau; France-Ida Jean; Hélène Gagnon
Abstract The chemical composition of the essential oils obtained from three different Lamiaceae, Lepechinia graveolens, L. floribunda and L. meyeni growing in the High Valley Region of Bolivia, Province of Cochabamba, was determined by a combination of GC and GC/MS measurements. Sesquiterpenes dominated in L. graveolens (61%). In the oil of L. meyeni the monoterpenes constituted the most important fraction (ca. 40%) followed by oxygenated sesquiterpenes (ca. 31%). Finally, the composition of the oil of L. floribunda was more complex: sesquiterpenes (20–28%), monoterpenes (21–20%), oxygenated sesquiterpenes (21–23%), and oxygenated monoterpenes (18.5–13%).
Essential Oils from Bolivia. VII. Myrtaceae:Myrcianthes osteomeloides(Rusby) McVaugh andMyrcianthes pseudomato(Legrand) McVaugh
(Taylor & Francis, 2005) Javier Bernardo Lopez Arze; France-Ida Jean; Hélène Gagnon; Guy J. Collin; François-X. Garneau; André Pichette
Abstract The chemical composition of the essential oils of Myrcianthes osteomeloides and M. pseudomato was studied by GC and GC/MS. Myrcianthes osteomeloides oil contained 1,8-cineole (55.7%) as the major component followed by α-pinene (17.9%), α-terpineol (8.5%) and β-pinene (4.6%). We identified 1,8-cineole (24.4%), α-pinene (17.1%), linalool (11.7%), limonene (8.5%) and γ-terpinene (7.3%) as main constituents in M. pseudomato oil.
Essential Oils from Bolivia. VIII. Piperaceae:Piper heterophyllumRuizetPavón,P. aduncumL
(Taylor & Francis, 2008) Javier Bernardo Lopez Arze; Guy J. Collin; François-Xavier Garneau; France-Ida Jean; Hélène Gagnon
Abstract The chemical composition of the essential oils obtained from two species of the Piperaceae, Piper heterophyllum and P. aduncum growing in the province of Cochabamba, in the high valley region of Bolivia, was determined by a combination of GC and GC-MS measurements. The composition of the oils from P. heterophyllum and two of the three samples of P. aduncum was dominated by the monoterpenes: 1,8-cineole (40 %), pinenes (α - + β -: 15 %), and β-ocimene (cis + trans : 9 %). Asaricine (9%) is also among the main constituents.
Essential Oils from Bolivia. X. Asteraceae: Gnaphalium Viravira Molina
(SAGE Publishing, 2008) Javier Bernardo Lopez Arze; Guy J. Collin; François-Xavier Garneau; France-Ida Jean; Hélène Gagnon
The chemical composition of the essential oil obtained from Gnaphalium viravira growing in the high valley region of Bolivia, Province of Cochabamba, was determined by a combination of GC and GC/MS measurements. The composition of the oil is dominated by non oxygenated terpenes. The main products are limonene, α-copaene, β-caryophyllene, geranyl-α-terpinene, and geranyl- p-cymene. Oxygenated monoterpenes account for less than 10%.
Essential Oils from Bolivia. XI. Verbenaceae :Aloysia gratissima(Gillies & Hook.) Tronc. and Boraginaceae :Cordia chacoensisChodat
(Taylor & Francis, 2013) Javier Bernardo Lopez Arze; Guy J. Collin; François-Xavier Garneau; France-Ida Jean; Hélène Gagnon
The compositions of the essential oil of the aerial parts of Aloysia gratissima and Cordia chacoensis are almost similar. In both cases, oxygenated sesquiterpenes constituted the main group (be- tween 40 and 50 %): 6α-hydroxygermacra-1(10),4-diene being the major compound (∼ 16 %). Sesquiterpenic molecules constitute the second important group (30 – 34 %) with β-caryophyllene as the major compound (8.0 %).
Essential oils from Bolivia. XII. Asteraceae:Ophryosporus piquerioides(D.C.) Benth. ex Baker
(Taylor & Francis, 2013) F.-X. Garneau; Guy J. Collin; France-Ida Jean; Hélène Gagnon; Javier Bernardo Lopez Arze
The essential oils of two samples of Ophryosporus piquerioides (D.C.) Benth. ex Baker growing wild in Bolivia were analyzed to determine their chemical composition. These samples were collected at two different periods of the year and although the same components appear in both samples, the relative percentages show an important variation. Davanone and its isomer isodavanone, (E)-nerolidol and caryophyllene oxide are the main components in both samples A and B: 65 and 30%, respectively. Camphor, borneol, and bornyl acetate are important minor components: 8.0 and 14.2%, respectively. Camphene (2.0 and 2.4%) and β-caryophyllene (3.3 and 6.1%) are the main hydrocarbon compounds. However, the four davana ethers are observed in sample A: almost 7%. Only traces of these compounds are observed in sample B. Finally, 6α-hydroxygermacra-1(10),4-diene and β-davanon-2-ol are noticeable products in sample B (3.1 and 1.9%).
Essential oils from Bolivia. XIII. Myrtaceae:Blepharocalyx salicifolius(Kunth.) O. Berg
(Taylor & Francis, 2012) François-X. Garneau; Guy J. Collin; France‐I. Jean; Hélène Gagnon; Javier Bernardo Lopez Arze
The essential oils of two samples of Blepharocalyx salicifolius (Kunth.) O. Berg growing wild in Bolivia were analyzed to determine their chemical composition. These samples were collected at different periods of the year and although the same products appear in the samples, the relative percentages show an important variation. Mono-oxygenated sesquiterpene molecules, among them ledol and (E)-nerolidol, are the main compounds observed in one sample. In another sample, about two-thirds of the observed compounds are monoterpenes, and more particularly β- and α-pinenes, 35% and 17%, respectively.