Zobrazeno 1 - 10
of 10
pro vyhledávání: '"Libia Alarcón"'
Publikováno v:
Avances en Química, Vol 9, Iss 1, Pp 7-13 (2014)
Allylic hydroxylation of ent-kaur-16-en-19-oic acid (1a) with SeO2 was tried using either dioxane or dichloro-methane as solvents as well as different reagent and reaction time conditions at room temperature. Oxidation of 1a in dioxane with H2O2 decr
Externí odkaz:
https://doaj.org/article/db3becbfee194869a6cfaf3c1a2a314e
Autor:
Alexis Peña, Libia Alarcón, José Gregorio Baptista, Rosa Aparicio, Thayded Villasmil, Alfredo Usubillaga
Publikováno v:
Avances en Química, Vol 7, Iss 3, Pp 187-192 (2012)
Espeletia nana Cuatrec is a resinous plant, member of the Espeletiinae Subtribe. It is a small size frailejón, 25cm high, found at Páramo Ortiz, Trujillo State, Venezuela. Leaves and roots were separately extracted with a 3:1 mixture of hexane-diet
Externí odkaz:
https://doaj.org/article/d3dffd26c9784b869264343df864e71b
Publikováno v:
Avances en Química, Vol 3, Iss 3, Pp 95-97 (2008)
The acid fraction of the resin obtained from the leaves of Coespeletia moritziana, a “frailejón” collected at Páramo of Piedras Blancas, Mérida State, Venezuela, yielded ent-kaurenic acid, ent-kaur-9(11)-dien-19-oic acid (grandiflorenic acid),
Externí odkaz:
https://doaj.org/article/f37db390d75345238e8084393a1c1f5b
Autor:
Libia, Alarcón, Alexis, Peña, Judith, Velascd, José Gregorio, Baptista, Luis, Rojas, Rosa, Aparicio, Alfredo, Usubillaga
Publikováno v:
Natural product communications. 10(4)
The essential oil from the leaves ofRuilopezia bracteosa was obtained by hydrodistillation, and analyzed by GC-MS. Eighteen components, which made up 99.6% of the oil were identified, the most abundant being β-myrcene (34.2%), α-pinene (24.3%), 7-e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=pmid________::692b4fb9e7ab4b86e68c75bf3b3f920c
https://pubmed.ncbi.nlm.nih.gov/25973502
https://pubmed.ncbi.nlm.nih.gov/25973502
Autor:
Alexis Peña, Libia Alarcón, José Gregorio Baptista, Rosa Aparicio, Thayded Villasmil, Alfredo Usubillaga
Publikováno v:
Avances en Química, Vol 7, Iss 3, Pp 187-192 (2012)
La Espeletia nana Cuatrec. es una planta resinosa perteneciente a la Subtribu Espeletiinae. Es una especie de frailejón de pequeño tamaño que alcanza unos 25cm de altura y se encuentra en el Páramo de Ortiz. Estado Trujillo, Venezuela. Las hojas
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::e5764ba3a9817a31807a0f7917651433
http://www.saber.ula.ve/handle/123456789/36633
http://www.saber.ula.ve/handle/123456789/36633
Autor:
Julia Bruno-Colmenarez, Graciela Díaz de Delgado, Alexis Peña, Libia Alarcón, Alfredo Usubillaga, Paulino Delgado-Méndez
Publikováno v:
Redalyc
El ácido ent-15α-hidroxi-kaur-16-en-19-oico, C20H30O3, aislado de las hojas de Coespeletia moritziana se reporta en este trabajo. Este compuesto cristaliza en el sistema monoclínico de grupo espacial C2 y parámetros de celda a=19.7509 (5), b=10.5
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::d49d88f7ecb8fe429c193958a4762a05
http://www.saber.ula.ve/handle/123456789/33824
http://www.saber.ula.ve/handle/123456789/33824
Autor:
Alida, Pérez Colmenares, Libia, Alarcón, Luis B, Rojas, Anne-Claire, Mitaine-Offer, Laurent, Pouységu, Stéphane, Quideau, Thomas, Paululat, Alfredo, Usubillaga, Marie-Aleth, Lacaille-Dubois
Publikováno v:
Natural product communications. 5(11)
Two new steroidal alkaloids (1-2) have been isolated from the leaves and roots of Solanum hypomalacophyllum Bitter, respectively. Their structures have been elucidated as deacetoxysolaphyllidine-3-O-beta-D-glucopyranoside (1) and 4-keto-5,6-dihydro-(
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=pmid________::698a83475df0f165028210c7987ee8b4
https://pubmed.ncbi.nlm.nih.gov/21213971
https://pubmed.ncbi.nlm.nih.gov/21213971
Autor:
José Gregorio Baptista, Judith Velascd, Libia Alarcón, Luis B. Rojas, Alfredo Usubillaga, Rosa Aparicio, Alexis Peña
Publikováno v:
Natural Product Communications. 10:1934578X1501000
The essential oil from the leaves of Ruilopezia bracteosa was obtained by hydrodistillation, and analyzed by GC-MS. Eighteen components, which made up 99.6% of the oil were identified, the most abundant being β-myrcene (34.2%), α-pinene (24.3%), 7-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::32369cdc8e9ab8be9652373ed2ecfbbe
https://doi.org/10.1177/1934578x1501000432
https://doi.org/10.1177/1934578x1501000432
Autor:
Alida Pérez Colmenares, Anne Claire Mitaine-Offer, Laurent Pouységu, Marie-Aleth Lacaille-Dubois, Alfredo Usubillaga, Thomas Paululat, Stéphane Quideau, Libia Alarcón, Luis B. Rojas
Publikováno v:
Natural Product Communications. 5:1934578X1000501
Two new steroidal alkaloids (1-2) have been isolated from the leaves and roots of Solanum hypomalacophyllum Bitter, respectively. Their structures have been elucidated as deacetoxysolaphyllidine-3- O-β-D-glucopyranoside (1) and 4-keto-5,6-dihydro-(2
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f5d3dfcd231790c11e54d73fe47c1aef
https://doi.org/10.1177/1934578x1000501108
https://doi.org/10.1177/1934578x1000501108
Autor:
José Gregorio Baptista, Juan Carmona, Alexis Peña, Luis B. Rojas, Alfredo Usubillaga, Libia Alarcón, Rosa Aparicio, Judith Velasco
Publikováno v:
Scopus-Elsevier
The essential oil of the leaves of Espeletia nana Cuatrec, obtained by hydrodistillation, was analyzed by GC-MS, which allowed the identification of 24 components, which made up 99.9% of the oil. The most abundant compounds were α-pinene (38.1%), β
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::afa3180b9af61cc78e8d44272affd6b7
http://www.scopus.com/inward/record.url?eid=2-s2.0-84861491767&partnerID=MN8TOARS
http://www.scopus.com/inward/record.url?eid=2-s2.0-84861491767&partnerID=MN8TOARS