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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

Estudo fitoquímico e avaliações da toxicidade aguda e atividades biológicas da raiz do vetiver (Vetiveria zizanioides L. Nash) Poaceae / Phytochemical study and evaluation of agude toxicity and biologival activities of the roots Vetiver (Vetiveria zizanioides L. Nash) Poaceae

BARROS, Gilvana Cristina de 23 March 2009 (has links)
Made available in DSpace on 2014-07-29T16:11:52Z (GMT). No. of bitstreams: 1 Dissertacao_Gilvana_Barros.pdf: 958039 bytes, checksum: 58f51272a6554708bb8913fd5b9e2a96 (MD5) Previous issue date: 2009-03-23 / The use of medicinal plants in controlling the diseases has shown its potential for the discovery of new medicines. Among the plant species used in the Hospital de Medicina Alternativa (HMA / SES-GO) highlights the vetiver (Vetiveria zizanioides L. Nash), an aromatic plant of the family Poaceae, used as a mild anti-hypertensive and diuretic. In this work it was investigated the chemical composition of the hydroalcoholic extract of vetiver, the freeze-dried aqueous extract and the essential oil from the roots of V. zizanioides. In the hydroalcoholic extract were found terpenoids compounds and / or saponins, flavonoids and phenolic acid. In the freeze-dried aqueous extract was observed the presence of flavonoids and phenols. In the essential oil 38 compounds were identified, and khusimol, palustrol, khusimona, zizanona and epi-α-vetivona were the major constituents. In the assessment of the acute toxicity of the hydroalcoholic extract and the freeze-dried aqueous extract of root of V. zizanioides, it was concluded that these extracts showed no toxicity at a dose of 2000 mg / kg. The freeze-dried aqueous extract of the roots of V. zizainoides showed no statistically significant diuretic action in the doses tested. In the investigation of antimicrobial activity, the essential oil of the root of V. zizanioides showed potent activity to inhibiting the growth of Staphylococcus aureus with MIC of 0.15 mg / mL. The crude ethanolic extract showed an antimicrobial activity with MIC of 0.19 mg / mL for Bacillus cereus and Micrococcus roseus and 0.39 mg / mL for Micrococcus luteus, S. aureus and Bacillus subtilis. The hexane fraction showed stronger antimicrobial activity against strains of M. luteus, M. roseus, S. aureus and B. cereus. This study could prove that the essential oil, the crude ethanol extract and hexane fraction from roots of V. zizanioides showed antimicrobial potential. / O uso de plantas medicinais no controle de doenças tem revelado o seu potencial para a descoberta de novos medicamentos. Dentre as espécies vegetais utilizadas no Hospital de Medicina Alternativa (HMA/SES-GO) destaca-se o vetiver (Vetiveria zizanioides L. Nash), uma planta aromática da família Poaceae, utilizada como anti-hipertensivo leve e diurético. Neste trabalho investigou-se a composição química do extrato hidroalcoólico de vetiver, do extrato aquoso liofilizado e do óleo essencial das raízes de V. zizanioides. No extrato hidroalcoólico foram encontrados compostos terpenóides e/ou saponinas, flavonóides e ácido fenólico. No extrato aquoso liofilizado verificou-se presença de flavonóides e fenóis. No óleo essencial foram identificados 38 compostos, sendo khusimol, palustrol, khusimona, epizizanona e α-vetivona os constituintes majoritários. Na avaliação da toxicidade aguda dos extratos hidroalcoólico e no extrato aquoso liofilizado da raiz de V. zizanioides, concluiu-se que esses extratos não apresentaram toxicidade na dose de 2000 mg/kg. O extrato aquoso liofilizado das raízes de V. zizanioides não demonstrou ação diurética estatisticamente significativa nas doses testadas. Na investigação da atividade antimicrobiana, o óleo essencial da raiz de V. zizanioides apresentou potente atividade inibidora do crescimento de Staphylococcus aureus com CIM de 0,15 mg/mL. Para o extrato etanólico bruto verificou-se uma ação antimicrobiana com CIM de 0,19 mg/mL para Micrococcus roseus e Bacillus cereus e 0,39 mg/mL para Micrococcus luteus, S. aureus e Bacillus subtilis. A fração hexano apresentou ação antimicrobiana mais intensa contra as cepas de M. luteus, M. roseus, S. aureus e B. cereus. Com este estudo foi possível comprovar que o óleo essencial, o extrato etanólico bruto e a fração hexano provenientes da raiz de V. zizanioides apresentaram potencial antimicrobiano.

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