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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

Punica granatum: quantificação de polifenóis de extratos e potencial antifúngico contra Candida albicans / Punica granatum: quantification of extract of polyphenols and potential antifungal against candida albicans

Oliveira, Luna Mares Lopes de [UNESP] 19 January 2016 (has links)
Submitted by LUNA MARES LOPES DE OLIVEIRA (DINTER) null (lunamares@saolucas.edu.br) on 2017-01-27T02:26:31Z No. of bitstreams: 1 CAPITULO TESE - LUNA MARES LOPES DE OLIVEIRA.pdf: 792305 bytes, checksum: 7e19ae8eb4ac1ad2447d7290d4746ef9 (MD5) / Approved for entry into archive by LUIZA DE MENEZES ROMANETTO (luizamenezes@reitoria.unesp.br) on 2017-01-31T13:11:06Z (GMT) No. of bitstreams: 1 oliveira_lml_dr_araca.pdf: 792305 bytes, checksum: 7e19ae8eb4ac1ad2447d7290d4746ef9 (MD5) / Made available in DSpace on 2017-01-31T13:11:06Z (GMT). No. of bitstreams: 1 oliveira_lml_dr_araca.pdf: 792305 bytes, checksum: 7e19ae8eb4ac1ad2447d7290d4746ef9 (MD5) Previous issue date: 2016-01-19 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / As propriedades antimicrobianas da romã são atribuídas aos compostos fenólicos, mais especificamente aos taninos hidrolisáveis (THs) galotaninos (ácido gálico) e elagitaninos (ácido elágico), substâncias naturais de defesa da planta. Os objetivos deste estudo foram avaliar os níveis de ácido elágico e fenóis totais, rendimento dos métodos de extração e o potencial inibitório sobre Candida albicans de extratos de partes da Punica granatum. Amostras em triplicata de cascas, sementes e folhas desidratadas, trituradas, pulverizadas, foram submetidas a dois métodos de extração: soxhlet tendo como solventes etanol e metanol e percolação tendo como solvente o etanol. Após a obtenção dos extratos, foram determinados os teores de ácido elágico por cromatografia liquida de alta eficiência e fenóis totais expressos em ácido gálico pelo método espectrofotométrico. A atividade antifúngica dos extratos foi avaliada pelo método de difusão em disco, seguindo-se as normas do National Committee for Clinical and Laboratory Standards (NCCLS document M2-A8, 2003a.). As maiores concentrações de fenóis totais e de ácido elágico foram encontradas nas folhas e na casca da romã. Verificou-se maior eficiência de rendimento por meio da percolação. Os resultados de difusão em disco revelaram maior sensibilidade da cepa de C. albicans aos extratos etanólicos da casca por ambos os métodos de extração. O método percolação alcoólica a 70% e 25ºC e a casca da romã apresentaram a maior eficiência de extração e de atividade anti-fúngica contra uma cepa clínica de C. albicans. / The antimicrobial properties of pomegranate are attributed to the phenolic compounds, more specifically the hydrolyzable tannins (THs) galotaninos (gallic acid) and elagitaninos (ellagic acid), natural plant defense substances. The objectives of this study were to evaluate the levels of ellagic acid and total phenols, yield of the extraction methods and the inhibitory potential against Candida albicans of extracts from parts of Punica granatum. Samples of dried, peels, seeds and leaves were used in triplicates and the extracts were obtained by Soxhlet system and percolation using respectively ethanol, methanol and ethanol solvents. After obtaining the extracts, the ellagic acid contents were determined by high performance liquid chromatography (HPLC) and total phenols expressed in gallic acid by the spectrophotometric method. The antimicrobial activity was evaluated by the disc diffusion method, following the standards of the National Committee for Clinical and Laboratory Standards (NCCLS document M2-A8, 2003a.). The highest concentrations of THs were found in leaves and pomegranate peel. Greater yield efficiency was verified by percolation. The results of diffusion on disc revealed higher sensitivity of the C. albicans strain to the ethanolic extracts of peels by both methods of extraction, presenting inhibition halos of approximately 10 mm. The alcoholic percolation method at 70% and 25ºC and the pomegranate peel showed the highest extraction efficiency and antifungal activity against a clinical strain of C. albicans. / FAPESP: 2014/08643-2 / CAPES: 88881.030445/2013-1

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