• JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
 
  Bookmark and Share
 
 
Master's Dissertation
DOI
https://doi.org/10.11606/D.60.2013.tde-19122013-134329
Document
Author
Full name
Gisele Maria Metta
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
Ribeirão Preto, 2013
Supervisor
Committee
Oliveira, Anderson Rodrigo Moraes de (President)
Barth, Thiago
Cardoso, Carmen Lúcia
Title in Portuguese
Avaliação de fungos na obtenção do metabólito quiral e ativo fexofenadina
Keywords in Portuguese
Análise enantiosseletiva
Biotransformação
CLAE
DLLME
Fexofenadina
HF-LPME.
Abstract in Portuguese
A fexofenadina (FEX) tem sido o fármaco de primeira escolha no tratamento sintomático de manifestações alérgicas, por ser um anti-histamínico dos receptores H1 de 2ª geração não sedativo. É o metabólito ativo e quiral da terfenadina (TERF), medicamento cuja produção e comercialização foram suspensas em função dos eventos adversos apresentados. Fungos têm se apresentado como uma alternativa promissora na produção de compostos com atividade biológica. Dessa forma, o objetivo desse projeto foi avaliar a capacidade de fungos em biotransformar enantiosseletivamente a terfenadina em seu metabólito ativo, a fexofenadina empregando fungos como agentes catalisadores. Para a análise enantiosseletiva da fexofenadina foi desenvolvido um método de separação cromatográfica empregando a coluna quiral Lux® cellulose-1, fase móvel constituída de água: metanol (35:65, v/v) + 0,3% trietilamina + 0,4% ácido acético, vazão de 0,5 mL min-1, com detecção em 220nm. Duas microtécnicas de preparação de amostras foram avaliadas na extração dos analitos do meio de cultura: a microextração liquido-liquido dispersiva (DLLME) e a microextração em fase liquida empregando membranas cilíndricas ocas (HF-LPME). Entre essas, a DLLME foi a microtécnica de escolha, pois forneceu melhores resultados tais como, maior valor de recuperação, cromatogramas sem picos de possíveis interferentes, maior rapidez e facilidade de preparação das amostras. As condições otimizadas da DLLME foram: clorofórmio (300 ?L) como solvente extrator, isopropanol (300 ?L) como solvente dispersor. Após a formação do ponto nuvem, as amostras foram submetidas à agitação por vórtex durante 15 segundos e centrifugação durante 10 minutos a 3000 rpm. As recuperações foram de 43% para ambos enantiômeros. O método se mostrou linear na faixa de concentração 2.0 - 15.0 ?g mL-1 para cada enantiômero da FEX (r > 0,990). O limite de quantificação foi de 2 ?g mL-1 para os enantiômeros da FEX. Dentre os sete fungos estudados (Papulaspora immersa Hotson SS13, Penicillium crustosum VR4, Mucor rouxii, Nigrospora sphaerica SS67, Fusarium oxysporum SS50, Cunninghamella echinulata var. elegans ATCC 8688A e Cunninghamella elegans NRRL 1393 ATCC 10028B) somente o fungo Fusarium oxysporum SS50 e Cunninghamella echinulata var. elegans ATCC 8688A apresentaram potencial para biotransformação da terfenadina em fexofenadina nas condições de incubação empregadas nesse trabalho.
Title in English
Evaluation of fungi in obtaining chiral active metabolite fexofenadine
Keywords in English
Biotransformation
DLLME
Enantioselective analysis
Fexofenadine
HF-LPME
HPLC
Abstract in English
Fexofenadine (FEX) has been the drug of choice for the symptomatic treatment of allergic manifestations, being an antihistamine H1 receptor 2nd generation non-sedating. It is the active and chiral metabolite of terfenadine (TERF), a drug whose production and marketing was suspended as a result of adverse events. Fungi have been presented as a promising alternative for the production of compounds with biological activity. Thus, the goal of this project was to evaluate the ability of fungi to biotransform asymmetric terfenadine to its active metabolite, fexofenadine using fungi as agents catalysts. For enantioselective analysis of fexofenadine a method for chromatographic separation was developed employing a chiral column Lux® cellulose -1, mobile phase water : methanol (35:65,v/v) + 0.3% triethylamine + 0.4% acetic acid, flow rate of 0.5 mL min-1, with detection at 220nm. Two sample preparation microtechnology were evaluated in the extraction of analytes from the culture medium: the dispersive liquid-liquid microextraction (DLLME) and hollow fiber liquid phase microextraction (HF- LPME). Between the two, the DLLME was the microtechnic chosen because it provided better results such as higher recovery values, chromatograms with no possible interfering peaks, greater speed and ease of sample preparation. The optimized conditions of DLLME were: chloroform (300 ?L) as extractor solvent, isopropanol (300 ?L) as disperser solvent. After the formation of the cloud point, the samples were subjected to agitation by vortexing for 15 seconds and centrifuging for 10 minutes at 3000 rpm. The recoveries were 43 % for both enantiomers. The method was linear in the concentration range from 2.0 -15.0 ?g mL-1 for each enantiomer of FEX (r > 0.990). The limit of quantification was 2 ?g mL-1 for the enantiomers of FEX. Among the seven fungi studied (Papulaspora immersa Hotson SS13, Penicillium crustosum VR4, Mucor rouxii, Nigrospora sphaerica SS67, Fusarium oxysporum SS50, Cunninghamella echinulata var. elegans ATCC 8688A e Cunninghamella elegans NRRL 1393 ATCC 10028B), only the fungi Fusarium oxysporum SS50 e Cunninghamella echinulata var. elegans ATCC 8688A showed potential for biotransformation of terfenadine in fexofenadine in the incubation conditions employed in this work.
 
WARNING - Viewing this document is conditioned on your acceptance of the following terms of use:
This document is only for private use for research and teaching activities. Reproduction for commercial use is forbidden. This rights cover the whole data about this document as well as its contents. Any uses or copies of this document in whole or in part must include the author's name.
Publishing Date
2014-02-26
 
WARNING: Learn what derived works are clicking here.
All rights of the thesis/dissertation are from the authors
CeTI-SC/STI
Digital Library of Theses and Dissertations of USP. Copyright © 2001-2024. All rights reserved.