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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

Fitossíntese de nanopartículas de prata: uma revisão e um estudo do potencial redutor do extrato da casca de romã e da atividade antifúngica dessas nanopartículas / Phythosynthesis of silver nanoparticles: review of literature and a study of the reductor potential of pomegranate peel extract and its antifungal potential

Sauvesuk, Luana [UNESP] 16 October 2017 (has links)
Submitted by Luana Sauvesuk null (luana_sauvesuk@hotmail.com) on 2017-10-26T17:07:51Z No. of bitstreams: 1 Dissertação de mestrado- Luana Sauvesuk - UNESP-FOA 26.10 pós defesa.pdf: 4367747 bytes, checksum: 5e1aa26820a5d96f8ddb932295fee7aa (MD5) / Approved for entry into archive by Monique Sasaki (sayumi_sasaki@hotmail.com) on 2017-10-31T18:02:55Z (GMT) No. of bitstreams: 1 sauvesuk_l_me_araca.pdf: 4367747 bytes, checksum: 5e1aa26820a5d96f8ddb932295fee7aa (MD5) / Made available in DSpace on 2017-10-31T18:02:55Z (GMT). No. of bitstreams: 1 sauvesuk_l_me_araca.pdf: 4367747 bytes, checksum: 5e1aa26820a5d96f8ddb932295fee7aa (MD5) Previous issue date: 2017-10-16 / O presente estudo revisou na literatura trabalhos entre 2006 e 2017 relacionados à fitossíntese de nanopartículas de prata (AgNP) e destacar a variedade de plantas passíveis de serem utilizadas e o quanto estas influenciam as características e propriedades dessas nanopartículas. Avaliou-se também como a temperatura (25, 50, 70 e 95°C) e a concentração de extrato da casca de romã (Punica granatum) (7, 14 e 28 mg mL-1) interferem na efetividade da reação fitoquímica por meio da quantificação dos íons Ag+ livres na solução de AgNP. A atividade antifúngica das AgNP produzidas foi avaliada por meio do método da microdiluição (CLSI M27-A2) contra cepas padrão (ATCC) de Candida albicans e Candida glabrata. As AgNP foram caracterizadas por microscopia eletrônica de varredura (MEV), difração de raios-X e espectroscopia UV/visível. O extrato da casca desidratada da romã foi obtido por maceração seguido de percolação em etanol (70%) e desidratado em rota-evaporador. Quantificou-se os fenóis totais expressos em ácido gálico por método colorimétrico e o ácido elágico por HPLC, sendo respectivamente 158,61 e 4,21 mg mL-1. Foram revisados mais de duzentos artigos relacionados à fitossintese de AgNP, onde cerca de cento e setenta plantas foram utilizadas para esta síntese e sendo a maioria delas geograficamente concentradas nos continentes asiático e europeu. As AgNP fitossintezadas no presente estudo apresentaram concentração de íons livres de Ag+ proporcional à quantidade de extrato utilizada na reação e maior nas temperaturas mais elevadas, e foram efetivas contra ambas cepas padrão de Candida avaliadas. / The present work reviewed in the literature studies of phythosynthesis of silver nanoparticles (AgNP) between 2006 and 2017, highlighting the variety of plants used to and how they can influence the characacteristics and properties of AgNP. This work also evaluated the influence of temperature (25, 50, 70 and 95°C) and concentration of peel extract of pomegranate (Punica granatum) (7, 14 and 28 mg mL-1) on the effectiveness of phytosynthesis reaction by quantifying the free Ag+ ions in the AgNP soluction. The antifungal activity of AgNP against reference strains (ATCC) of Candida albicans and Candida glabrata were evaluated by the microdilution method (CLSI M27-A2). AgNP were characterized through scanning electron microscopy (SEM), X-Ray diffraction and UV-Vis spectroscopy. The pomegranate peel was dehydrated and the hydroalcoholic extract was obtained by maceration followed by percolation, and then obtained the crude extract using a rotary evaporator. Total phenols expressed in galic acid and elagic acid were quantified in the extract using a colorimetric method and by HPLC, and the values found were 158.61 and 4.21 mg mL-1, respectively. It was found more than two hundred studies using about an hundred seventy plants to synthesize AgNP, being the majority of those plants from the Asiatic and European Continents. The AgNp phytosynthesized in the present study presented the concentration of free Ag+ ions proportional with the quantity of pomegranate peel extract and it was high when the temepratures used in the reaction were above 50ºC. Also, AgNP were effective against both Candida reference strains evaluated.

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