Výsledky vyhledávání - "Luis B. Rojas"

Akademický článek

Aprovechamiento de desechos orgánicos: 1. Extracción y caracterización del aceite de semillas de naranja colectadas en expendios ambulantes de jugos

Autor: María Escalante, Iris Santos, Luis B. Rojas, Cristóbal Lárez Velásquez

Publikováno v: Avances en Química, Vol 7, Iss 3, Pp 181-186 (2012)

The Soxhlet extraction, using n-hexane as solvent, of the orange seed oil from waste residues obtained in street sales of fruit juices of Merida, Venezuela, was studied. Yields of 5.1% oil (w/w) and 42.7% (w/w) relative to the initial mass of the res

Externí odkaz: https://doaj.org/article/098d9266085a4926b0fccca9baa8411a

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Analysis of the acid and neutral fractions present in Carramboa tachirensis (Aristeg.) Cuatrec. (Asteraceae) by Gas Chromatography-Mass Spectrometry

Autor: Rosa Aparicio, Alfredo Usubillaga, Ysbelia M Obregón, Luis B. Rojas

Publikováno v: Revista de la Facultad de Farmacia.

The genus Carramboa (family Asteraceae) comprises seven species, among which is the Carramboa tachirensis (Aristeg.) (Cuatrec.), species endemic to the Andean paramos. In this paper we prepared an extract of n-hexane: diethyl ether (3:1) from dried l

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::26703beb3b7503a8268b4202a2fe7b6a
https://doi.org/10.54305/rffucv.2021.84.1-2.11

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Extractivos del duramen de especies latífoliadas como preservantes en la madera de Pinus caribaea

Autor: Jesus Enrique Velasquez Gil, Luis B. Rojas, Osvaldo Encinas

Publikováno v: Colombia Forestal, Vol 22, Iss 2, Pp 44-54 (2019)

Se evaluó el comportamiento de los extractos del duramen de tres especies latífoliadas: Handroanthus serratifolius, Centrolobium paraense y Tectona grandis frente a hongos de pudrición marrón y blanca. Se impregnaron bloques de albura de Pinus ca

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1d7b345987229c372fc876710924767a
https://revistas.udistrital.edu.co/index.php/colfor/article/view/14115

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Composición de aceites esenciales y actividad citotóxica en dos especies de plantas del género Vismia (Hypericaceae) de los Andes venezolanos

Autor: Alexis Buitrago Díaz, Felipe Sojo, Alírica I. Suárez, Luis B. Rojas, Janne Rojas-Vera, Francisco Arvelo

Publikováno v: Revista de Biología Tropical; Vol. 68 No. 3 (2020): Revista de Biología Tropical (Int. J. Trop. Biol.): Continuous publication, July-September 2020; 884-891
Revista de Biología Tropical; Vol. 68 Núm. 3 (2020): Revista de Biología Tropical (Int. J. Trop. Biol.): Publicación continua, Julio-Setiembre 2020; 884-891
Revista Biología Tropical; Vol. 68 N.º 3 (2020): Revista de Biología Tropical (Int. J. Trop. Biol.): Publicación continua, Julio-Setiembre 2020; 884-891
Portal de Revistas UCR
Universidad de Costa Rica
instacron:UCR

Introduction: The Vismia genus belongs to the Hypericaceae family and comprises around 57 species of which 17 have been located in Venezuela. Previous investigations have been carried out in extracts as well as pure isolated compounds, revealing anti

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4ea9f0ae1610966995a592647f532484
https://revistas.ucr.ac.cr/index.php/rbt/article/view/39503

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Synthesis and leishmanicidal evaluation of sulfanyl- and sulfonyl-tethered functionalized benzoate derivatives featuring a nitroimidazole moiety

Autor: Denis Deffieux, Philippe A. Peixoto, Alexis Fernández, Stéphane Quideau, José Domínguez, Jaime Charris, Noris Rodríguez, Miguel A. Rodríguez, Laurent Pouységu, Luis B. Rojas, Joyce Gutiérrez

Publikováno v: Archiv der Pharmazie / Chemistry in Life Sciences
Archiv der Pharmazie / Chemistry in Life Sciences, Wiley-VCH Verlag, 2020, 353 (5), ⟨10.1002/ardp.202000002⟩

A series of new nitroimidazole-containing derivatives was synthesized by coupling of 2-[2-(2-methyl-5-nitro-1H-imidazol-1-yl)ethylthio]ethanol with diversely substituted benzoic acids. Upon treatment with m-CPBA, 12 of these sulfanyl compounds were f

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d8109d8a6a56daff20212afc9bae5678
https://pubmed.ncbi.nlm.nih.gov/32180262

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Oleanane-type glycosides from Pittosporum tenuifolium 'variegatum' and P. tenuifolium 'gold star'

Autor: Chiaki Tanaka, Carmelo Rosquete Porcar, Marie-Aleth Lacaille-Dubois, Laurent Pouységu, Anne Claire Mitaine-Offer, Stéphane Quideau, Tomofumi Miyamoto, Luis B. Rojas, Mayra Rengifo Carrillo

Publikováno v: Phytochemistry. 140:166-173

The phytochemical study of two cultivars of Pittosporum tenuifolium Banks & Sol. ex Gaertn, “variegatum” and “gold star”, led to the isolation of eight oleanane-type glycosides: seven previously undescribed and a known one. Their aglycons are

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8eae3e7b50f2591d3af0d744340855d1
https://doi.org/10.1016/j.phytochem.2017.04.013

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Actividad antifúngica in vitro de los extractivos naturales de especies latifoliadas de la Guayana Venezolana

Autor: Luis B. Rojas, Osvaldo Encinas, María E Toro, Jesús Velásquez

Publikováno v: Redalyc

Se determinó en condiciones de laboratorio el efecto microbiológico de los metabolitos secundarios, desarrollados como mecanismo de defensa pasiva, en la madera de las especies Puy (Tabebuia serratifolia (Vahl.) Nicholson), Zapatero (Peltogyne porp

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ea5705744e429d8750b9ac4bb3397be3
https://doi.org/10.21829/myb.2006.1211250

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Acylated oleanane-type saponins from Ganophyllum giganteum

Autor: Elier Galarraga Montes, Stéphane Quideau, Clément Delaude, Thomas Paululat, Juan Amaro-Luis, Luis B. Rojas, Laurent Pouységu, Patrick Dutartre, Anne Claire Mitaine-Offer, Marie-Aleth Lacaille-Dubois, Stéphanie Delemasure

Publikováno v: Phytochemistry. 98:236-242

Five oleanane-type saponins , 3- O -β- D -glucuronopyranosylzanhic acid 28- O -β- D -xylopyranosyl-(1→3)-[α- L -rhamnopyranosyl-(1→2)]-(4- O -acetyl)-β- D -fucopyranosyl ester ( 1 ), 3- O -β- D -glucopyranosylzanhic acid 28- O -β- D -xylopy

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::91b547d02afc4f0665847fdc9888db83
https://doi.org/10.1016/j.phytochem.2013.11.003

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Triterpene saponins from Billia rosea

Autor: María Rodríguez, Marie-Aleth Lacaille-Dubois, Stéphane Quideau, Anne Claire Mitaine-Offer, Freddy González-Mujica, Laurent Pouységu, Doris Jimenez, Luis B. Rojas, Thomas Paululat, Luis De Freitas, Sherley Pimentel

Publikováno v: Phytochemistry. 141

Five previously undescribed triterpene saponins, billiosides A-E, and a known analogue, were isolated from the seeds of Billia rosea (Planch. & Linden) C. Ulloa & P. Jorg. Their structures were elucidated on the basis of extensive 1D and 2D NMR exper

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4ea7fbd254d61d3bc7d24656587675dd
https://pubmed.ncbi.nlm.nih.gov/28599241

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Chemical Composition of the Essential Oil ofCroton huberiSteyerm. (Euphorbiaceae) Collected from Tachira-Venezuela

Autor: Luis B. Rojas, Janne Rojas, Alexis Buitrago, José Cárdenas, Juan Carmona

Publikováno v: Journal of Essential Oil Bearing Plants. 16:646-650

GC and GC-MS analyses of Croton huberi essential oil showed the presence of fourteen compounds, with the major ones being β-caryophyllene (18.3 %) and germacrene-D (16.1 %) while valencene (8.3 %), caryophyllene oxide (7.3 %), bicycle-germacrene (7.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8cfc9078a93896da9eff59b77b373572
https://doi.org/10.1080/0972060x.2013.854502

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