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Academic literature on the topic 'Amarilidácea'
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Dissertations / Theses on the topic "Amarilidácea"
Bessa, Carliani Dal Piero Betzel. "Estudo químico e biológico em alcaloides de Hippeastrum aulicum (KER GAWL.) HERB. : uma espécie da família Amaryllidaceae." reponame:Repositório Institucional da UFES, 2015. http://repositorio.ufes.br/handle/10/1808.
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CAPES
As espécies da família Amaryllidaceae estão distribuídas em regiões quentes e temperadas ao redor do mundo. Essa família produz um grupo bem conhecido de alcaloides, os isoquinolínicos, que demonstram ampla variedade de atividades biológicas, assim como antiviral, anticâncer, inibição da acetilcolinesterase (AChE), antimalárica, entre outras. Nesse trabalho, são relatados o estudo químico dos alcaloides presentes na espécie brasileira Hippeastrum aulicum e a investigação de atividades antiparasitárias contra Trypanosoma cruzi e Leishmania infantum dos alcaloides isolados. Para tanto, foi realizada extração ácido-base dos extratos metanólicos de bulbos e folhas de H. aulicum, seguida por técnicas cromatográficas de separação, com o objetivo de isolar os alcaloides presentes na espécie. Foram obtidos 11 alcaloides: haemantamina (1), albomaculina (2), haemantidina (3), 6- epihaemantidina (4), N-óxido haemantamina (5), 7-metoxi-O-metillicorenina (6), aulicina (7), licorina (8), trisfaeridina (9), galantina (10) e norpluvina (11). O N-óxido haemantamina é relatado pela primeira vez a partir de fonte natural e nesse trabalho foi totalmente caracterizado por métodos espectrométricos e espectroscópicos. Os alcaloides 1, 2, 6, 7 e 8 foram testados in vitro contra os parasitas Trypanosoma cruzi e Leishmania infantum em diferentes concentrações e haemantamina (1) apresentou-se como importante agente contra a forma promastigota de L. infantum com IC50 de 0,6 M, enquanto 7-metoxi-O-metillicorenina (6) mostrou atividade contra a forma tripomastigota de T.cruzi, sendo mais ativo (IC50 = 89,55 M) e mais seletivo (IS > 2,2) que o padrão utilizado (benzonidazol, IC50 = 440,7 M, IS = 1,0).
The species of Amaryllidaceae family are found in warm and tropical regions around the world. This family produces a well-known group of isoquinolines alkaloids which have demonstrated a wide range of biological activities such as antiviral, anticancer, acetylcholinesterase (AChE) inhibition, antimalarial, among others. In this paper it is going to be reported the chemical study of alkaloids present in the Brazilian species Hippeastrum aulicum and the investigation of antiparasitic activity against Trypanosoma cruzi and Leishmania infantum of the isolated alkaloids. In order to conclude the study and investigation it was performed classical acid-base extraction of methanol extracts of bulbs and leaves of H. aulicum, followed by chromatographic separation techniques. 11 alkaloids were obtained: haemanthamine (1), albomaculine (2), haemanthidine (3), 6-epihaemanthidine (4), haemanthamine Noxide (5), 7-methoxy-O-methyllycorenine (6), aulicine (7), lycorine (8), trisphaeridine (9), galanthine (10) and norpluvine (11). Haemanthamine N-oxide was obtained for the first time from natural source and it has been characterized by spectrometric and spectroscopic methods. The alkaloids 1, 2, 6, 7 and 8 were tested in vitro against parasites Trypanosoma cruzi and Leishmania infantum in different concentrations. Haemanthamine (1) showed to be an important agent against promastigote form of L. infantum with IC50 of 0,6 M while 7-methoxy-O-methyllycorenine (6) displayed activity against trypomastigote forms of T. cruzi, which is more active (IC50 = 89,55 M) and more selective (IS > 2,2) than the standard (benzonidazol, IC50 = 440,7 M, IS = 1,0) .
Pascual, Mendoza Edisson Pedro. "Propagación in vitro de Ismene amancaes (R.and P.) Herbert "Amancay" (Amaryllidaceae)." Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2007. https://hdl.handle.net/20.500.12672/878.
Full text--- Ismene amancaes (Amaryllidaceae) is a endemic plant of Lomas in Lima. Very little is known about the natural propagation. It provide a slow rate of multiplication. The objetive of this research was to develop one methodology that permit to multiply I. amancaes as alternative for conservation. Bulbs were collects in “Santuario de Amancaes” lomas (Pachacamac). Explants (twin scales) were cultured on tubes with culture medium supplemented with 3% sucrose, 0,5% charcoal actived and 4 levels of ANA (0; 0,5; 1,0 and 1,5 mg/L) with 4 levels of BAP (0; 5; 10 and 15 mg/L), pH 5,7. It was incubated in two environment: dark and light (16 hour light/8 hour dark photoperiod). I. amancaes in vitro plantlets (bulblets) were obtained successfully, showing 1 – 3 bulblets by explants. Optimal status from ANA for micropropagation was 0,0 to 0,5 mg/L combined with BAP 0,0 to 5,0 mg/L. Bulblets induction were not increase by ligth. Root induction was not necesary for glasshouse establishment.
Tesis
Ruschel, Tallini Luciana. "Estudio de los alcaloides de las Amaryllidaceae como fuente de nuevas moléculas bioactivas." Doctoral thesis, Universitat de Barcelona, 2018. http://hdl.handle.net/10803/650349.
Full textPaulo, de Andrade Jean. "Estudio de la composición alcaloídica de Narcissus broussonetii y de tres especies brasileñas del género Hippeastrum (Amaryllidaceae)." Doctoral thesis, Universitat de Barcelona, 2014. http://hdl.handle.net/10803/147272.
Full textPlants of the Amaryllidaceae family are a well-known source of tetrahydroisoquinoline alkaloids. These bases have demonstrated a wide-range of biological activities including antiviral, antitumoral, antiparasitic, psychopharmacological, acetylcholinesterase inhibitory, among others. The Brazilian species Hippeastrum papilio, H. aulicum and H. calyptratum along with the African species Narcissus broussonetii were studied in the present Thesis. From H. papilio, an epimer of the previous isolated alkaloid habranthine, 11alpha-hydroxygalanthamine, were isolated and identified using NMR techniques. Furthermore, the 11beta-hydroxygalanthamine showed an important in vitro acetylcholinesterase inhibitory activity (IC50 14.5 ± 0.33 miliM). Additionally, Hippeastrum papilio yielded substantial quantities of galanthamine. Applying the GC-MS technique and an in-home mass fragmentation database, twenty-three alkaloids were identified including the very rare dinitrogenous alkaloids obliquine, plicamine and secoplicamine were identified in Narcissus broussonetii. Using LC-ESI-LTQ-Orbitrap-MS, these dinitrogenous compounds showed a similar fragmentation profile for obliquine and plicamine but different for secoplicamine. Pretazettine, a potent cytotoxic alkaloid, was also isolated from N. broussonetii although its identification by GC-MS was only possible by a BSTFA-derivatization. The silylated crude methanolic extract only showed the presence of pretazettine-TMS, confirming that tazettine is formed after the alkaloid extraction. As a part of ongoing project in MS of Amaryllidaceae alkaloids, the silylated tazettine and pretazettine were studied by GC-MS/MS differing in their fragmentation routes. Finally, the EtOAc extract of N. broussonetii showed a notable in vitro activity against Trypanosoma cruzi with an IC50 value of 1.77 µg/ml. Regarding Hippeastrum aulicum and H. calyptratum, the phytochemical procedure guided by GC-MS allowed the identification of two crinine-type alkaloids aulicine and 3-O-methyl-epimacowine, respectively. In addition, a further two new alkaloids 11-oxohaemanthamine (3) and 7-methoxy-O-methyllycorenine (4) were both isolated from H. aulicum. Furthermore, complete NMR spectroscopic data are provided for the homolycorine analogues nerinine (5) and albomaculine (6). Absolute stereochemistry of the 5,10b-ethano bridge in the crinine variants was arrived at by circular dichroism and X-ray crystallographic analysis, affording the first direct evidence for the presence of crinine-type alkaloids in the genus Hippeastrum.
Guo, Ying. "Research on the Alkaloids of Amaryllidaceae Plants: Genera Lycoris and Hippeastrum." Doctoral thesis, Universitat de Barcelona, 2015. http://hdl.handle.net/10803/318797.
Full textLa familia Amaryllidaceae presenta un grupo específico de alcaloides isoquinolínicos, que suelen mostrar un amplio espectro de actividades biológicas. Se han seleccionado para su estudio 9 especies del género Lycoris (L. albiflora, L. aurea, L. chinensis, L. haywardii, L. incarnata, L. longituba, L. radiata, L. sprengeri, and L. squamigera) y una variedad L. radiata var. pumila. El género Lycoris presenta numerosos endemismos en China. Las especies Hippeastrum papilio y H. calyptratum originarias de Brasil también han sido objeto de estudio. Por lo que respecta a las especies estudiadas del género Lycoris, la identificación de sus alcaloides se ha llevado a cabo por GC-MS. Este estudio ha permitido identificar un total de 31 alcaloides. En el perfil de los extractos de las especies estudiadas predominan los alcaloides que presentan un acoplamiento fenol-oxidativo orto-para’ (tipo licorina) y para-orto’ (tipo galantamina). El número de alcaloides detectado en cada una de las especies estudiadas oscila entre 10 (L. incarnata y L. radiata var. pumila) y 20 (L. longituba) compuestos. Todos los alcaloides detectados e identificados habían sido caracterizados con anterioridad. En el estudio de Hippeastrum papilio se constató la presencia del alcaloide galantamina en cantidades notables –de interés por su utilización como tratamiento paliativo de la Enfermedad de Alzheimer-, además de los nuevos compuestos hippapilina, papilina y 3-O-(3’-hidroxibutanoil)hemantamina junto a los ya conocidos 11β-hidroxigalantamina, apogalantamina, hemantamina, narwedina y 9-O-demethyllycosinine B. El alcaloide hippapilina es el primer ejemplo de fusión cis B/C con los protones 10b y 1 en orientación beta. Por su parte, el alcaloide papilina muestra una remarcable actividad frente a Trypanosoma brucei rhodesiense (cepa STIB 900, estadio tripomastigote) con un IC50 de 0.523 μg/ml. Finalmente, el estudio de la especie Hippeastrum calyptratum nos ha permitido la identificación de 17 compuestos, de los cuales el alcaloide del tipo crinina 3-O-metilepimacowina, se aisla por primera vez de una fuente natural.
Pigni, Natalia Belén. "Biodiversidad y Conservación de Recursos Fitogenéticos. Las Amarillidáceas como Fuente de Productos Bioactivos." Doctoral thesis, Universitat de Barcelona, 2013. http://hdl.handle.net/10803/120668.
Full textThe study of biodiversity is essential for conservation. Nature provides a variety of useful resources, for instance, natural products still play a major role in drug development. Plants belonging to the Amaryllidaceae family (subfam. Amaryllidoideae) are characterized by the presence of an exclusive group of alkaloids showing a wide range of biological activities. The aim of the present work has been to bioprospect among the diverse plant species of the family Amaryllidaceae found in the Mediterranean and Iberoamerican areas by analyzing their alkaloids, with the ultimate goal of using this information to obtain pharmacologically active compounds. In general, the methodology comprised a combination of spectroscopic and chromatographic techniques, mainly NMR and GC-MS. The results have been exposed in four scientific papers and can be divided in three main sections: 1- Isolation and characterization of alkaloids from Narcissus serotinus L., a Mediterranean species from which 8 new compounds have been identified: narseronine, 1-O-(3´-acetoxybutanoyl)lycorine, 3-O-methylnarcissidine, 1-O-acetyl-3-O-methylnarcissidine, 1-O-acetyl-3-O-methyl-6-oxonarcissidine, 2-methoxypratosine, 11-hydroxygalanthine and 2-O-methylclivonine. Additionally, other known alkaloids were recognized by GC-MS. 2- Study of daffodils belonging to the section Ganymedes, including the characterization of the alkaloid content of N. triandrus L., as well as a GC-MS analysis of the alkaloid profile of 18 wild populations from the Iberian Peninsula, comprising all the taxa of the section. The results revealed the presence of mesembrane alkaloids, typical compounds of the genus Sceletium and unusual within the Amaryllidaceae family. 3- Analysis of Argentinian Amaryllidaceae as a source of bioactive compounds. The alkaloid content of four wild species, Habranthus jamesonii, Phycella herbertiana, Rhodophiala mendocina and Zephyranthes filifolia, is reported for the first time, together with evaluation of the biological activity of their extracts as inhibitors of the acetylcholinesterase enzyme. This study as a whole demonstrates once again the great potential of plant species of the Amaryllidaceae family (subfam. Amaryllidoideae) as a source of bioactive compounds and alkaloids with novel structures, confirming the importance of promoting the continuous characterization of unexplored species.