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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

ContribuiÃÃo ao conhecimento quÃmico de plantas do nordeste do Brasil: Bauhinia ungulata L. (Leguminoseae) / Contribution of the chemical knowledge of plants of Northeast of Brazil

MoisÃs Maia Neto 21 February 2006 (has links)
CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior / O gÃnero Bauhinia, famÃlia Leguminosae, compreende mais de 300 espÃcies distribuÃdas nas Ãreas tropicais do planeta, onde sÃo utilizadas na medicina popular no tratamento do diabetes. Estudos farmacolÃgicos preliminares [1] indicaram aÃÃo hipoglicemiante de Bauhinia ungulata L., conhecida popularmente como âPata-devacaâ, porÃm nenhum estudo fitoquÃmico havia sido realizado para a espÃcie[2]. Desta forma, o presente estudo se propÃs ao isolamento e determinaÃÃo estrutural dos constituintes volÃteis e nÃo-volÃteis das folhas de Bauhinia ungulata, e a posterior realizaÃÃo de testes farmacolÃgicos com os compostos isolados para a comprovaÃÃo da sua atividade farmacolÃgica. O estudo dos constituintes volÃteis das folhas de Bauhinia ungulata (Figura I) foi realizado atravÃs de um acompanhamento da composiÃÃo quÃmica do Ãleo essencial. Os principais constituintes encontrados no Ãleo de B. ungulata foram: (E)- -Cariofileno (1), -Humuleno (2), Germacreno D (3), Ãxido de Cariofileno (4), - Copaeno (5), Germacreno B (6), -Cadineno (7) e Biciclogermacreno (8). Foram observadas alteraÃÃes no teor do Ãleo das 9:00 para Ãs 12:00 hs com aumento dos constituintes 4 e 8 e reduÃÃo de 2, 3, 5, 6 e 7 alÃm do surgimento de sesquiterpenos oxigenados exclusivamente Ãs 12:00 hs. Para o estudo dos constituintes nÃo-volÃteis (Figura II) foram utilizados os extratos hexÃnico (EHBU) e etanÃlico (EEBU) das folhas de B. ungulata. ApÃs sucessivos tratamentos cromatogrÃficos, o extrato EEBU forneceu 4 metabÃlitos secundÃrios identificados como os flavonÃides 3,5,7-tri-hidroxi-2-(3â,4â-dihidroxifenil)- 4H-cromen-4-ona (Quercetina) (BU-1), Quercetina-3-OarabinofuranosÃdio (BU-2) e Quercetina-3-O--RhamnopiranosÃdio (Quercitrina) (BU-3) alÃm do inositol metoxilado 3-O-metil-quiroinositol (D-pinitol) (BU-4). A partir da fraÃÃo alcaloÃdica do EEBU foram obtidos os alcalÃides -carbolÃnicos harmano (BU-5) e eleagnina (tetrahidroharmano) (BU-6). A identificaÃÃo e quantificaÃÃo dos constituintes quÃmicos volÃteis foram realizadas atravÃs de cromatografia gasosa acoplada a espectrometria de massa (CG/EM). XVII A caracterizaÃÃo estrutural dos compostos nÃo-volÃteis foi realizada atravÃs de tÃcnicas espectroscÃpicas, incluindo RMN-1D (ÂH, ÂÂC, DEPT), RMN-2D (COSY, HMQC, HMBC, NOESY) e espectroscopia de infravermelho (IR). / The Bauhinia genus possess 300 species distributed in tropical area of the planet. Species of this genus have been used in popular medicine on the diabetes treatment. Preliminary pharmacological studies showed hypoglicemic action of Bauhinia ungulata L. [1], popularly known on the northeast of Brazil as âpata-de-vacaâ, however, no phytochemical study has been reported yet [2]. This work reports the isolation and structural charactherization of the volatile and non-volatile constituents from the leaves of Bauhinia ungulata, for the accomplishment of pharmacological tests with the isolated compounds. A circadian study of the chemical composition of the leaves of B. ungulata was carry out with its essential oil. The main constituents were: (E)--caryophyllene (1), - humulene (2), germacrene D (3), cariilene (4), -copaene (5), germacrene B (6), - cadimene (7) e byciclogermacrene (8). Changes were observed at 9:00 to 12:00 a.m. with the increase of contents of the constituents 4 and 8, and reduction of contents of compounds 2, 3, 5, 6, 7, besides of appearance of oxygenated terpenes only at 12:00 a.m. The phytochemical study of the non-volatile constituents was accomplished by the investigation of the hexane (EHBU) and ethanol (EEBU) extracts. From the EHBU traicontanol was obtained in high contents. Sucessive chromatographies from the EEBU yielded 4 metabolites charactherized as the flavonoids quercetine, quercetine-3- O-arabinofuranoside and quercitrine, besides the methoxy inositol 3-O-metil- D-pinitol. The alkaloid fraction yielded the -carbolines harmane e eleagnine. XIX The identification of the volatile compounds was done by GLC/MS. Structure charactherization of the non-volatile was made by spectroscopic methods such as IR and two and one dimensional ÂH and ÂÂC NMR (COSY, HMQC, HMBC),
2

Estudo químico e avaliação biológica de Phanera glabra (Jacq.) Vaz & Bauhinia ungulata L. (FABACEAE) / Chemical study and biological evaluation of Phanera glabra (Jacq.) Vaz & Bauhinia ungulata L. (FABACEAE)

Sousa, Lôncio Mesquita de January 2016 (has links)
SOUSA, Leôncio Mesquita de. Estudo químico e avaliação biológica de Phanera glabra (Jacq.) Vaz & Bauhinia ungulata L. (FABACEAE). 2016. 263 f. Tese (Doutorado em Química)-Universidade Federal do Ceará, Fortaleza, 2016. / Submitted by Aline Mendes (alinemendes.ufc@gmail.com) on 2016-12-21T20:43:17Z No. of bitstreams: 1 2016_tese_lmsousa.pdf: 24821219 bytes, checksum: 3899ad5625838e46813ab9727472fabc (MD5) / Approved for entry into archive by Jairo Viana (jairo@ufc.br) on 2016-12-27T16:16:42Z (GMT) No. of bitstreams: 1 2016_tese_lmsousa.pdf: 24821219 bytes, checksum: 3899ad5625838e46813ab9727472fabc (MD5) / Made available in DSpace on 2016-12-27T16:16:42Z (GMT). No. of bitstreams: 1 2016_tese_lmsousa.pdf: 24821219 bytes, checksum: 3899ad5625838e46813ab9727472fabc (MD5) Previous issue date: 2016 / This paper describes the chemical and biological study of species Phanera glabra (Jacq.) Vaz and Bauhinia ungulata L. The chemical composition of essential oil from leaves of B. ungulata, obtained by hydrodistillation, was analysed by gas chromatography-mass spectroscopy (GC-MS) and gas chromatography-flame ionization detector. Twenty-two constituents were identified representing 85.90% of the total composition: Caryophyllene oxide (22.99%), (E)-caryophyllene (14.53%) and α-copaene (7.17%) were the major constituents. Larval bioassay against Aedes aegypti of B. ungulata essential oil showed LC50 value of 75.12 ± 2.82 µg/mL. The cytotoxic effect against four human tumor cell lines HL-60, MCF-7, NCI-H292 and HEP-2 was evaluated, showing IC50 values of 10.57; 22.25; 23.11 and 26.56 µg/ mL, respectively. The study of the non-volatile constituents was initiated with the preparation of the hexane and ethanol extracts from stems of P. glabra. The chromatographic fractionation of these extracts allowed the isolation of lupenone (PG–1), the mixture of sitosterol and stigmasterol (PG–2), 4'-hydroxy-7- methoxyflavone (PG–3), 3',7-dimethoxy-4'-hydroxyflavone (PG–4) and 5,5'- dihydroxy-2',3,7-trimethoxyflavone (PG–5). Taraxerol (BU–1), betulinic acid (BU–2), taraxerone (BU–3), glutinol (BU–4), the mixture of sitosterol and stigmasterol (BU–5), pacharin (BU–6), naringenin (BU–7) and eriodictyol (BU–8), liquiritigenin (BU–9), guibourtinidol (BU–10) and fisetinidol (BU–11) were obtained from the extracts from stems of B. ungulata; while 3,5-dimethoxy-4-methyl-2’-hydroxybibenzyl (BU–12) and 3,5-dimethoxy-2’-hydroxybibenzyl (BU–13) were isolated from the ethanol extract of the roots. The structures of the compounds were elucidated by spectroscopic methods as IR, MS, 1D and 2D NMR, and by comparison with previously reported data in the literature. It's worth noting that BU–12 is unprecedented in the literature and the 13C NMR data of BU–13 are reported for the first time in this work. The cytotoxicity of BU–12 has been evaluated against four human cancer cell lines, showing IC50 values of 4.3 and 6.5 µg/mL against pro-myelocytic leukemia (HL-60) and cervical adenocarcinoma (HEP-2) cell lines, respectively. / O presente trabalho relata o estudo químico e biológico das espécies Phanera glabra (Jacq.) Vaz e Bauhinia ungulata L. A composição química do óleo essencial das folhas de B. ungulata, obtido por hidrodestilação, foi determinada e quantificada por cromatografia gasosa acoplada à espectrometria de massas (CG-EM) e detector de ionização por chama (CG-DIC), sendo, portanto, identificado 85,90% dos seus constituintes: Óxido de cariofileno (22,99%), (E)-cariofileno (14,53%) e α-copaeno (7,17%) foram os constituintes majoritários. O óleo essencial teve sua atividade larvicida avaliada sobre Aedes aegypti, sendo obtido um valor de CL50 igual a 75,12 µg/mL. A atividade citotóxica do OEBU foi realizada sobre quatro linhagens tumorais humanas HL-60, MCF-7, NCI-H292 e HEP-2, através do método do MTT. O estudo dos componentes não voláteis foi iniciado com a preparação dos extratos hexânico e etanólico dos caules de P. glabra. O fracionamento cromatográfico destes extratos permitiu o isolamento de lupenona (PG–1), mistura de sitosterol e estigmasterol (PG–2), 4’-hidroxi-7-metoxiflavana (PG–3), 3’,7-dimetoxi-4’-hidroxiflavana (PG–4) e 5,5'-dihidroxi-2',3,7-trimetoxiflavona (PG–5). Taraxerol (BU–1), ácido betulínico (BU– 2), taraxerona (BU–3), glutinol (BU–4), mistura de sitosterol e estigmasterol (BU–5), pacharina (BU–6), naringenina (BU–7), eriodictiol (BU–8), liquiritigenina (BU–9), guibourtinidol (BU–10) e fisetinidol (BU–11) foram isolados a partir dos extratos dos caules de B. ungulata; enquanto do extrato etanólico das raízes de B. ungulata foram isolados 3,5-dimetoxi-4-metil-2’-hidroxibibenzil (BU–12), substância inédita na literatura, e 3,5-dimetoxi-2’-hidroxibibenzil (BU–13) cujos dados de RMN 13C são descritos pela primeira vez neste trabalho. As estruturas dos compostos foram elucidadas através de técnicas espectroscópicas tais como IV, EM, RMN 1D e 2D, e por comparação com dados descritos na literatura. O bibenzil 3,5-dimetoxi-4-metil-2’- hidroxibibenzil mostrou atividade citotóxica significativa contra as linhagens celulares humanas HL-60 e HEP-2 com valores de IC50 de 4,3 e 6,5 µg/mL, respectivamente.
3

Estudo químico e avaliação biológica de Phanera glabra (Jacq.) Vaz & Bauhinia ungulata L. (FABACEAE) / Chemical study and biological evaluation of Phanera glabra (Jacq.) Vaz & Bauhinia ungulata L. (FABACEAE)

Sousa, Leôncio Mesquita de January 2016 (has links)
SOUSA, Leôncio Mesquita de. Estudo Químico e Avaliação Biológica de Phanera glabra (Jacq.) Vaz & Bauhinia ungulata L. (FABACEAE). 2016. 263 f. Tese (Doutorado em Química)-Universidade Federal do Ceará, Fortaleza, 2016. / Submitted by Aline Mendes (alinemendes.ufc@gmail.com) on 2017-01-24T21:20:20Z No. of bitstreams: 1 2016_tese_lmsousa.pdf: 24821219 bytes, checksum: e022dc323cde53950dcc209fb460ecf4 (MD5) / Approved for entry into archive by Jairo Viana (jairo@ufc.br) on 2017-01-26T20:20:52Z (GMT) No. of bitstreams: 1 2016_tese_lmsousa.pdf: 24821219 bytes, checksum: e022dc323cde53950dcc209fb460ecf4 (MD5) / Made available in DSpace on 2017-01-26T20:20:52Z (GMT). No. of bitstreams: 1 2016_tese_lmsousa.pdf: 24821219 bytes, checksum: e022dc323cde53950dcc209fb460ecf4 (MD5) Previous issue date: 2016 / This paper describes the chemical and biological study of species Phanera glabra (Jacq.) Vaz and Bauhinia ungulata L. The chemical composition of essential oil from leaves of B. ungulata, obtained by hydrodistillation, was analysed by gas chromatography-mass spectroscopy (GC-MS) and gas chromatography-flame ionization detector. Twenty-two constituents were identified representing 85.90% of the total composition: Caryophyllene oxide (22.99%), (E)-caryophyllene (14.53%) and α-copaene (7.17%) were the major constituents. Larval bioassay against Aedes aegypti of B. ungulata essential oil showed LC50 value of 75.12 ± 2.82 g/mL. The cytotoxic effect against four human tumor cell lines HL-60, MCF-7, NCI-H292 and HEP-2 was evaluated, showing IC50 values of 10.57; 22.25; 23.11 and 26.56 g/ mL, respectively. The study of the non-volatile constituents was initiated with the preparation of the hexane and ethanol extracts from stems of P. glabra. The chromatographic fractionation of these extracts allowed the isolation of lupenone (PG–1), the mixture of sitosterol and stigmasterol (PG–2), 4'-hydroxy-7-methoxyflavone (PG–3), 3',7-dimethoxy-4'-hydroxyflavone (PG–4) and 5,5'-dihydroxy-2',3,7-trimethoxyflavone (PG–5). Taraxerol (BU–1), betulinic acid (BU–2), taraxerone (BU–3), glutinol (BU–4), the mixture of sitosterol and stigmasterol (BU–5), pacharin (BU–6), naringenin (BU–7) and eriodictyol (BU–8), liquiritigenin (BU–9), guibourtinidol (BU–10) and fisetinidol (BU–11) were obtained from the extracts from stems of B. ungulata; while 3,5-dimethoxy-4-methyl-2’-hydroxybibenzyl (BU–12) and 3,5-dimethoxy-2’-hydroxybibenzyl (BU–13) were isolated from the ethanol extract of the roots. The structures of the compounds were elucidated by spectroscopic methods as IR, MS, 1D and 2D NMR, and by comparison with previously reported data in the literature. It's worth noting that BU–12 is unprecedented in the literature and the 13C NMR data of BU–13 are reported for the first time in this work. The cytotoxicity of BU–12 has been evaluated against four human cancer cell lines, showing IC50 values of 4.3 and 6.5 g/mL against pro-myelocytic leukemia (HL-60) and cervical adenocarcinoma (HEP-2) cell lines, respectively. / O presente trabalho relata o estudo químico e biológico das espécies Phanera glabra (Jacq.) Vaz e Bauhinia ungulata L. A composição química do óleo essencial das folhas de B. ungulata, obtido por hidrodestilação, foi determinada e quantificada por cromatografia gasosa acoplada à espectrometria de massas (CG-EM) e detector de ionização por chama (CG-DIC), sendo, portanto, identificado 85,90% dos seus constituintes: Óxido de cariofileno (22,99%), (E)-cariofileno (14,53%) e α-copaeno (7,17%) foram os constituintes majoritários. O óleo essencial teve sua atividade larvicida avaliada sobre Aedes aegypti, sendo obtido um valor de CL50 igual a 75,12 μg/mL. A atividade citotóxica do OEBU foi realizada sobre quatro linhagens tumorais humanas HL-60, MCF-7, NCI-H292 e HEP-2, através do método do MTT. O estudo dos componentes não voláteis foi iniciado com a preparação dos extratos hexânico e etanólico dos caules de P. glabra. O fracionamento cromatográfico destes extratos permitiu o isolamento de lupenona (PG–1), mistura de sitosterol e estigmasterol (PG–2), 4’-hidroxi-7-metoxiflavana (PG–3), 3’,7-dimetoxi-4’-hidroxiflavana (PG–4) e 5,5'-dihidroxi-2',3,7-trimetoxiflavona (PG–5). Taraxerol (BU–1), ácido betulínico (BU–2), taraxerona (BU–3), glutinol (BU–4), mistura de sitosterol e estigmasterol (BU–5), pacharina (BU–6), naringenina (BU–7), eriodictiol (BU–8), liquiritigenina (BU–9), guibourtinidol (BU–10) e fisetinidol (BU–11) foram isolados a partir dos extratos dos caules de B. ungulata; enquanto do extrato etanólico das raízes de B. ungulata foram isolados 3,5-dimetoxi-4-metil-2’-hidroxibibenzil (BU–12), substância inédita na literatura, e 3,5-dimetoxi-2’-hidroxibibenzil (BU–13) cujos dados de RMN 13C são descritos pela primeira vez neste trabalho. As estruturas dos compostos foram elucidadas através de técnicas espectroscópicas tais como IV, EM, RMN 1D e 2D, e por comparação com dados descritos na literatura. O bibenzil 3,5-dimetoxi-4-metil-2’-hidroxibibenzil mostrou atividade citotóxica significativa contra as linhagens celulares humanas HL-60 e HEP-2 com valores de IC50 de 4,3 e 6,5 μg/mL, respectivamente.

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