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Dissertations / Theses on the topic 'Alkaloids and flavonoids'

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Published: 3 June 2025

Last updated: 31 July 2025

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1

Yap, Veronica Alicia. "Alkaloids and flavonoids from Ficus, Artocarpus and Macaranga species : structure and anti-cancer activity." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/30655/.

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Plant natural products have played a pivotal role in the discovery and development of many new drugs for the treatment of various infectious diseases and cancers. The present study was therefore aimed at isolation and identification of novel bioactive compounds from selected plants collected in Malaysia with anti-cancer activity. Plant crude extracts were obtained using solvent extraction methods, while various chromatographic and spectroscopic methods were employed for compound isolation and structure elucidation. Evaluation of pure compounds and crude extracts for anti-cancer activity involv

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2

Vieira, Gabriella Pedrosa. "Compostos fenólicos, capacidade antioxidante e alcaloides em folhas e frutos (pericarpo, polpa e sementes) de Passifloras spp." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/9/9131/tde-13052014-143742/.

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A cultura popular atribui ao gênero Passiflora várias propriedades medicinais e funcionais. Frutas frescas e secas, cascas, infusões e suco da polpa de maracujás silvestres são consumidos e comercializados para controlar ansiedade, insônia, tremores, diabetes e obesidade, entre outras indicações. Dessa forma, os objetivos deste trabalho foram caracterizar e comparar as folhas e frutos (pericarpo, polpa e sementes) das espécies P. edulis Sims variedades BRS Sol do Cerrado, Ouro Vermelho e Gigante Amarelo, P. alata Curtis, P. setacea DC e P. tenuifila Killip em relação ao seu potencial funcional

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3

Kirana, Chandra. "Bio-active compounds isolated from mistletoe (Scurulla oortiana (Korth.) Danser) parasitizing tea plant (Camellia sinensis L.)." Title page, contents and summary only, 1996. http://web4.library.adelaide.edu.au/theses/09A/09ak58.pdf.

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Bibliography: leaves 87-96. This thesis investigates non-proteinaceous low molecular weight flavonoid and alkaloid compounds in Scurulla oortiana (Korth.) Danser grown on Camellia sinens. Three flavonols are identified in S. oortiana (Korth.) Danser growing on different hosts. The identification and characterisation of these flavonoids are carried out using various chromatographic and spectrometric procedures. Two purine alkaloids are isolated from and identified in S. oortiana (Korth.) Danser parasitizing tea plant, C. Sinensis. The antifungal activity of the phenolic compounds isolated from

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4

Oliveira, Stêno Lacerda de. "Fitoquímica de espécies de Erythroxylum do semiárido: isolamento e determinação estrutural de alcaloides tropânicos, flavonoides e diterpenos." Universidade Federal da Paraíba, 2012. http://tede.biblioteca.ufpb.br:8080/handle/tede/6730.

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Made available in DSpace on 2015-05-14T12:59:34Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 3371563 bytes, checksum: 0f72f1a088caa63b4cd2bf4057752d08 (MD5) Previous issue date: 2012-02-03<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>This work describes the results of phytochemical studies from three species of the Erythroxylum genus: Erythroxylum caatingae Plowman, Erythroxylum subrotundum A. St.-Hil and Erythroxylum revolutum Mart, which were identified by the botany sector of the Laboratory of Pharmaceutical Technology, UFPB. The species were submitted

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5

Mothibedi, Kediemetse (Kedimetse). "A study of electrospun nanofibers and diatomaceous earth materials for the extraction of alkaloids, flavonoids and aromatic amines in various matrices." Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1003052.

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The thesis explored the use of different sorbent materials in solid phase extraction method development. The methods included the use of the polymeric Agilent Bond Elut Plexa solid phase extraction and electrospun polymer-silica composite sorbents for clean-up and preconcentration. Sample clean-up for alkaloids (hydrastine and berberine) in goldenseal, Hydrastis canadensis and flavonoids (quercetin, kaempferol and isorhamnetin) in Ginkgo biloba was achieved using Bond Elut Plexa SPE sorbent. Clean-up of flavonoids in Ginkgo biloba was also achieved using electrospun polymer-silica composite (p

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6

Cardoso, Poliana Ramos. "Estruturas secretoras em órgãos vegetativos aéreos de Passiflora alata Curtis e P.edulis Sims (Passifloraceae) com ênfase na localização in situ de compostoa bioativos." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/315362.

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Orientador: Marilia de Moraes Castro<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Biologia<br>Made available in DSpace on 2018-08-16T08:54:49Z (GMT). No. of bitstreams: 1 Cardoso_PolianaRamos_M.pdf: 9377524 bytes, checksum: 3ae09511f3adb4c573d5459c04c08e1a (MD5) Previous issue date: 2010<br>Resumo: Esta tese tem como principal objetivo contribuir para o conhecimento morfológico das glândulas dos órgãos vegetativos aéreos de Passiflora alata Curtis e P. edulis Sims e localização dos compostos bioativos responsáveis pela reconhecida importância farmacológica apre

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7

Nascimento, Raimundo Regivaldo Gomes do. "Study Chemical and Biological Margaritopsis carrascoana Wright (Rubiaceae)." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=13424.

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FundaÃÃo Cearense de Apoio ao Desenvolvimento Cientifico e TecnolÃgico<br>Margaritopsis carrascoana is a small shrub belonging to the Rubiaceae family and endemic from northeastern of Brazil flora growing in the sandy soils of the region of Ibiapaba and Araripe plateaus â CearÃ state. The absence of reports of phytochemical studies related to this species, combined with occurrence of bioactive alkaloids in the genus, motivated us to perform chemical study. The plant specimen was collected in Araripe plateu, in MoreilÃndia-PE county. The phytochemical investigation of the ethanolic extract from

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8

OLIVEIRA, Tiago Branquinho. "Estudo Farmacognóstico, Investigação das Atividades Antimicrobiana, Leishmanicida e Toxicidade Aguda de Rhamnidium elaeocarpum Reissek RHAMNACEAE (Cafezinho)." Universidade Federal de Goiás, 2009. http://repositorio.bc.ufg.br/tede/handle/tde/2128.

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Made available in DSpace on 2014-07-29T16:11:53Z (GMT). No. of bitstreams: 1 dissertacao tiago oliveira.pdf: 60590 bytes, checksum: 2becac23a5f99abe922b4af561c0a7d1 (MD5) Previous issue date: 2009-08-27<br>In the last years the treatment with medicines made from medicinal plants has increased. A concern about the useful of these natural products is the quality control pharmacobotanical, phytochemical and purity tests, which make up the technical specifications of a particular plant species. Moreover, pharmacological and toxicological studies must be conducted in order to effectiveness and sa

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9

Sousa, Jéssica Celestino Ferreira. "Estudo Fitoquímico de Piptadenia stipulacea (Fabaceae: Minosoideae)." Universidade Federal da Paraíba, 2012. http://tede.biblioteca.ufpb.br:8080/handle/tede/6776.

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Made available in DSpace on 2015-05-14T12:59:49Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 2147842 bytes, checksum: 4096aadcaa77b162c3d6533c50132e36 (MD5) Previous issue date: 2012-02-28<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>The genus Piptadenia Benth. part of the Mimosoideae subfamily which is included to the Fabaceae family, the third largest family of angiosperms, widely distributed, being one of the largest in dicotyledonous and economic importance. Piptadenia stipulacea is widely distributed in the caatinga biome, and is used in popular medicine to treat

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10

Pan, Ende. "Searching for Anticancer Agents and Antimalarial Agents from Madagascar." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/77260.

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In our continuing search for biologically active natural products from Madagascar as part of an International Cooperative Biodiversity Group (ICBG) program, a total of four antiproliferative extracts were studied, leading to the isolation of twelve novel compounds with antiproliferative activity against the A2780 human ovarian cancer line, and one extract with antimalarial activities was studied, which led to the isolation of five new natural products with antimalarial activities against the Dd2 and HB3 malarial parasites. The plants and their metabolites are discussed in the following order:

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11

Ribeiro, Erika Maria de Oliveira. "Estudo fitoquímico de Erythroxylum rimosum O.E.Schulz e Erythroxylum betulaceum Mart. (Erythroxylaceae)." reponame:Repositório Institucional da UFBA, 2011. http://www.repositorio.ufba.br/ri/handle/ri/10077.

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240f.<br>Submitted by Ana Hilda Fonseca (anahilda@ufba.br) on 2013-04-01T16:40:21Z No. of bitstreams: 1 teseErikaVersaoFinal.pdf: 196222025 bytes, checksum: 392c4cd58c8a5d154afc1f1036d99967 (MD5)<br>Approved for entry into archive by Ana Hilda Fonseca(anahilda@ufba.br) on 2013-04-24T17:20:14Z (GMT) No. of bitstreams: 1 teseErikaVersaoFinal.pdf: 196222025 bytes, checksum: 392c4cd58c8a5d154afc1f1036d99967 (MD5)<br>Made available in DSpace on 2013-04-24T17:20:14Z (GMT). No. of bitstreams: 1 teseErikaVersaoFinal.pdf: 196222025 bytes, checksum: 392c4cd58c8a5d154afc1f1036d99967 (MD5) Previous issu

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12

Cheng, Yih-Dih, and 鄭奕帝. "Studies on the Alkaloids and Triterpenoids of Fissistigma oldhamii (Hemsl.) Merr. and Flavonoids of Moghania macrophylla (Willd.) O. Kuntze." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/40410459271287352139.

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博士<br>中國醫藥學院<br>藥物化學研究所<br>86<br>In a preliminary bioassay, the methanolic extracts of stems and leaves of Fissistigma oldhamii, and roots of Moghania macrophylla showed significant antiplatelet aggregation, antiinflammatory and antiallergic activities. Thirteen compounds, including three aristolactams, aristolactam BII (1), aristolactam FI (2) and piperolactam C (3), three aporphines, calycinine (4), dicentrine (5) and xylopine (6), three oxoaporphines, lanuginosine (7), O-methylmoschatoline (8) and oxocrebanine (9), one 4,5-dioxoaporphine, noraristolodione (l0), two morphinandien

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13

Kirana, Chandra. "Bio-active compounds isolated from mistletoe (Scurulla oortiana (Korth.) Danser) parasitizing tea plant (Camellia sinensis L.)." Thesis, 1996. http://hdl.handle.net/2440/109033.

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This thesis investigates non-proteinaceous low molecular weight flavonoid and alkaloid compounds in Scurulla oortiana (Korth.) Danser grown on Camellia sinens. Three flavonols are identified in S. oortiana (Korth.) Danser growing on different hosts. The identification and characterisation of these flavonoids are carried out using various chromatographic and spectrometric procedures. Two purine alkaloids are isolated from and identified in S. oortiana (Korth.) Danser parasitizing tea plant, C. Sinensis. The antifungal activity of the phenolic compounds isolated from mistletoe parasitizing tea p

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14

Lai, Yi-Chun, and 賴怡君. "Applications of LC-SPE-NMR Technique:I. Study on the alkaloids from the leaves of Neolitseasericea var. aurata II. Study on the flavonoids from the leaves of Neolitsea variabillima." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/3ypz77.

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碩士<br>國立臺灣大學<br>藥學研究所<br>93<br>This thesis was aimed to apply LC-SPE-NMR hyphenated technique in the isolation and structural elucidation of chemical constituents from two plant materials, i.e. the leaves of Neolitsea sericea var. aurata and Neolitsea variabillima. I. Study on the alkaloids from the leaves of Neolitsea sericea var. aurata Lauraceous plants of the Neolitsea genus have been shown to contain isoquinoline alkaloids, some of which possess cardiovascular effects. This study was aimed to investigate thoroughly the alkaloids present in the leaves of N. sericea (Blume) Koidz. var. au

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15

Ptáčníková, Lucie. "Obsah alkaloidů a flavonoidů v prameničce obecné." Master's thesis, 2012. http://www.nusl.cz/ntk/nusl-308295.

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Lucie Ptáčníková, The volume of alkaloids and flavonoids in Fontinalis antipyretica, Thesis, Charles University in Prague, Faculty of Pharmacy in Hradec Králové, thesis tutor: PharmDr. Jan Martin, PhD., Hradec Králové, 2012, 55 pages. Thesis called "Content of alkaloids and flavonoids in Fontinalis anitpyretica" establishes alkaloids and flavonoids and identifies one substance of these alkaloids in the above-mentioned water moss. The main purpose of this thesis was to obtain samples of Fontinalis antipyretica from selected locations in the Czech Republic (Ledce, Rychnovek, Kunvald). Next purpo

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16

"Antifungal activities of metergoline, purpurin and baicalein on Candida species." Thesis, 2010. http://library.cuhk.edu.hk/record=b6075072.

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Baicalein is known to be a potent antifungal agent and induces programmed cell death in Candida albicans. In the present study, we found that baicalein also inhibited the growth of C. krusei isolates. The minimal inhibitory concentrations of baicalein against eight C. krusei isolates were 1.35--2.70 microg/ml. One-hour exposure to baicalein elicited a consistent and moderate post-antifungal effect on the C. krusei isolates. Further flow cytometric study demonstrated a depolarization of mitochondrial membrane potential. However, both the levels of reactive oxygen species and DNA fragmentation

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