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au:PIMENTEL, M. FERNANDA

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Phytochemical and pharmacological reports of the hypoglycemic activity of the Moringa oleifera extracts
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Santos, Ariana da Silva

; Pimentel, Anderson Lopes

; Oliveira, João Victor Lessa de

; Silva, Michelle Teixeira da

; Silva, Fernanda Geny Calheiros

; Borges, Arthur Luy Tavares Ferreira

; Moura, Maria Aline Fidelis Barros de

; Silva, Sâmia Andrícia Souza da

; Nascimento, Ticiano Gomes do

Rodriguésia

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2022, Volume 73 elocation e01262021

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Resumo Moringa oleífera Lam. é uma planta arbórea pertencente à família Moringaceae distribuída em áreas tropicais e que tem ganhado enorme atenção nas últimas décadas. Esta pesquisa é uma revisão sobre a associação entre extratos aquosos de folhas de M. oleifera e diabetes mellitus e compreender suas funções farmacológicas e mecanismos subjacentes. O refinamento da pesquisa demonstrou o potencial farmacêutico da M. oleifera e seus fitoquímicos, dado seu efeito antidiabético. A análise prospectiva mostrou a quantidade de aplicação dentro do IPC A61K na área da saúde. Os metabólitos secundários presentes em M. oleifera, glucosinolatos, flavonóides e compostos fenólicos podem ser responsáveis, em parte, pelas ações hipoglicemiantes de controle da doença. Os glucosinolatos, quando metabolizados por enzimas salivares, dão origem a sulforafanos que atuam na prevenção do diabetes tipo 2 e na redução da resistência à insulina. Os flavonóides interagem com as enzimas intestinais modificando o metabolismo dos carboidratos, regulando os níveis glicêmicos, além de aumentar a sensibilidade à insulina. Os compostos fenólicos aumentam a expressão dos transportadores de glicose (GLUT4) e reduzem a síntese de ácidos graxos e colesterol, contribuindo para a redução da resistência à glicose e controle da glicemia. Moringa oleifera pode ser usada como terapia complementar do diabetes tipo 2.

Abstract Moringa oleifera is an arboreal plant belonging to the family Moringaceae distributed in tropical areas and has gained enormous attention in the last decades. This research is a review on the association between aqueous extracts of M. oleifera leaves and diabetes mellitus and understanding its pharmacological functions and underlying mechanisms. The research refinement demonstrated the pharmaceutical potential of M. oleifera and its phytochemicals, given its antidiabetic effect. The prospective analysis showed the amount of application within IPC A61K in health area. The secondary metabolites present in M. oleifera, glucosinolates, flavonoids, and phenolic compounds may be responsible, in part, for the disease control hypoglycemic actions. Glucosinolates, when metabolized by salivary enzymes, give rise to sulforaphanes that act in preventing type 2 diabetes and in reducing insulin resistance. Flavonoids interact with intestinal enzymes by modifying carbohydrate metabolism by regulating glycemic levels, in addition to increasing insulin sensitivity. Phenolic compounds increase the expression of glucose transporters (GLUT4) and reduce the synthesis of fatty acids and cholesterol, contributing to the reduction of glucose resistance and blood sugar control. Moringa oleifera can be used as complementary therapy of the type-2 diabetes.

https://doi.org/10.1590/2175-7860202273090

Migraine in 746 patients with multiple sclerosis
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Fragoso, Yara Dadalti

; Adoni, Tarso

; Alves-Leon, Soniza V.

; Apostolos-Pereira, Samira L.

; Carneiro, Marcos A. Diniz

; Chikota, Edila M.

; Diniz, Denise Sisterolli

; Eboni, Audred C. B.

; Gomes, Sidney

; Gonçalves, Marcus Vinicius M.

; Goncalves, Ricardo Pereira

; Inojosa, José Luiz

; Junqueira, Thiago F.

; Machado, Suzana Costa

; Malfetano, Fabiola Rachid

; Mansur, Letícia Fezer

; Mendes, Maria Fernanda

; Muniz, Andre

; Nobrega Junior, Adaucto W.

; Olival, Guilherme Sciascia do

; Parolin, Monica Fiuza

; Pimentel, Maria Lucia V.

; Rocha, Cristiane Franklin

; Ruocco, Heloisa Helena

; Santos, Gutemberg C.

; Siquineli, Fabio

; Soares, José Otavio D.

; Sousa, Nise Alessandra C.

; Tauil, Carlos Bernardo

; Winckler, Thereza Cristina A.

Arquivos de Neuro-Psiquiatria

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sep 2019, Volume 77 N. 9 Pages 617 - 621

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

RESUMO Enxaqueca piora o sofrimento do paciente que tem esclerose múltipla (EM). ID-migraine é uma ferramenta útil para seleção de pacientes com enxaqueca e Migraine Disability Assessment (MIDAS) é um questionário que avalia o impacto da doença. O objetivo do presente estudo foi avaliar a presença e impacto de enxaqueca em pacientes com EM. Métodos: Pacientes diagnosticados com EM e tratados em clínicas especializadas foram convidados a responder um questionário online se também apresentassem cefaleia. Resultados: O estudo incluiu 746 participantes com cefaleia e EM que preencheram completamente as respostas. Foram 625 mulheres e 121 homens, sendo 69% dos pacientes com idade entre 20 e 40 anos. Enxaqueca foi identificada em 404 pacientes (54,1%) e moderado a grave impacto da doença foi observado em 68,3% dos casos. Conclusão: Enxaqueca é uma cefaleia primária frequente e incapacitante relatada por pacientes com EM.

ABSTRACT Migraine adds to the burden of patients suffering from multiple sclerosis (MS). The ID-migraine is a useful tool for screening migraine, and the Migraine Disability Assessment questionnaire can evaluate disease burden. The aim of the present study was to assess the presence and burden of migraine in patients with MS. Methods: Patients diagnosed with MS attending specialized MS units were invited to answer an online survey if they also experienced headache. Results: The study included 746 complete responses from patients with MS and headache. There were 625 women and 121 men, and 69% of all the patients were aged between 20 and 40 years. Migraine was identified in 404 patients (54.1%) and a moderate-to-high burden of disease was observed in 68.3% of the patients. Conclusion: Migraine is a frequent and disabling type of primary headache reported by patients with MS.

https://doi.org/10.1590/0004-282x20190100 1666 downloads

OPTIMIZATION OF THE EXTRACTION OF FREE FATTY ACIDS APPLIED TO BIODIESEL PRODUCTION
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Albuquerque, Allan A.

; Cavalcanti, Cláudia J. S.

; Soares, Cícero H. M.

; Pimentel, Maria Fernanda

; Stragevitch, Luiz

Brazilian Journal of Chemical Engineering

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jun 2018, Volume 35 N. 2 Pages 327 - 340

Abstract: En | Text: En | PDF: En

Abstract The liquid-liquid extraction of free fatty acids (FFA) from residual oils and fats for biodiesel production, employing methanol as the solvent, has been optimized using process simulation and response surface methodology. The parameters investigated were temperature, number of stages and solvent-to-feed ratio (S/F). Responses evaluated were FFA mass fraction in the oil-rich phase ( w FFA B) and total cost, using yellow and brown greases as the raw materials. Quadratic and linear models were fitted for w FFA B and cost responses, respectively. The optimal conditions satisfying technical ( w FFA B ≤ 0.5%) and economic (minimum cost, including capital and operation costs, except for raw material cost) criteria were 321 K, 6 stages, S/F = 1.27, w FFA B = 0.41%, cost = $84.93/ton (yellow grease), and 318 K, 6 stages, S/F = 1.32, w FFA B = 0.49%, cost = $102.89/ton (brown grease).

https://doi.org/10.1590/0104-6632.20180352s20160265 2624 downloads

NIR Monitoring and Modelling of Soybean Oil Methanolysis with Multivariate Curve Resolution-Alternating Least Squares with Correlation Constraint
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Sales, Rafaella F.

; Lima, Suzana M. de

; Stragevitch, Luiz

; Pimentel, Maria Fernanda

; Juan, Anna de

Journal of the Brazilian Chemical Society

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may 2017, Volume 28 N. 5 Pages 695 - 706

Abstract: En | Text: En | PDF: En

Near infrared spectroscopy in-line monitoring and modelling of soybean oil methanolysis has been done using multivariate curve resolution alternating least squares (MCR-ALS) with correlation constraint. This constraint allows for quantitation of the methyl ester formed with little calibration effort and the MCR model provides additionally a general description (qualitative and quantitative) of the rest of components in the process. Due to the complexity of this process, which shows components with severe kinetic and spectral overlap, suitably designed multiset analysis strategies were adopted to improve the recovery of concentration profiles of the methyl ester. To assess the temperature and catalyst concentration effects on the kinetic reaction, five batches with different temperatures (20, 44 and 55 °C) and catalyst concentrations (0.75 and 1 m/m%) were produced. The concentration profiles of methyl ester obtained by MCR-ALS for each batch was the starting information used to develop a simplified kinetic model and calculate the activation energy.

https://doi.org/10.21577/0103-5053.20160218 2529 downloads

Evaluation of a PVC sensing phase for determination of chlorinated hydrocarbons in water by mid-infrared spectroscopy
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Silva, Andréa Monteiro S.

; Viana, Eduardo de Araujo

; Pimentel, Maria Fernanda

; Almeida, Yeda M. B.

; Raimundo Jr, Ivo M.

Journal of the Brazilian Chemical Society

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aug 2011, Volume 22 N. 8 Pages 1470 - 1477

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Neste trabalho, a espectroscopia no infravermelho médio foi utilizada para investigar o efeito da quantidade (25 ou 40%) e do tipo de plastificante (di-2-etilhexil ftalato (DOP), di-2-etilhexil sebacato (DOS) e 2-nitrofenil octil éter (NPOE)) na resposta analítica de uma fase sensora de poli(cloreto de vinila) (PVC) para a determinação de hidrocarbonetos clorados (clorobenzeno (ClB), tricloroetileno (TCE) e triclorobenzeno(TCB)) em água. Foi observado que os filmes com 40% de plastificante geraram maior sensibilidade e menores limites de detecção que aqueles preparados com 25%, embora esses últimos sejam de manipulação mais fácil. Um comportamento similar foi também observado para fases sensoras preparadas com os plastificantes NPOE e DOS. Com o uso da fase sensora de PVC-DOS e um tempo de extração de 60 min, foram obtidos limites de detecção de 0,3, 0,6 e 0,5 mg L-1 para clorobenzeno, tricloroetileno e triclorobenzeno, respectivamente.

In this work, mid-infrared spectroscopy has been employed to investigate the effect of amount (25 or 40%) and type of plasticiser (di-2-ethylhexyl sebacate (DOS), di-2-ethylhexyl phthalate (DOP) and 2-nitrophenyl octyl ether (NPOE)) on the analytical response of a poly(vinylchloride) (PVC) sensing phase for the determination of the chlorinated hydrocarbons (chlorobenzene (ClB), trichloroethylene (TCE) and trichlorobenzene (TCB)) in water. It was observed that films with 40% of plasticiser provided higher sensitivity and lower limits of detection than those with 25%, although the later films are easier to handle. A similar behaviour was also observed for sensing phases prepared with the plasticisers NPOE and DOS. By employing a DOS-based PVC sensing phase and extraction time of 60 min, limits of detection of 0.3, 0.6, and 0.5 mg L-1 were obtained for chlorobenzene, trichloroethylene and trichlorobenzene, respectively.

2122 downloads

Simultaneous spectrophotometric determination of lamivudine and zidovudine in fixed dose combinations using multivariate calibration
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Grangeiro Jr., Severino

; Albuquerque, Miracy M.

; Santana, Davi P.

; Pimentel, Maria Fernanda

; Silva, Reniere H. da

; Simões, Simone S.

Química Nova

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2011, Volume 34 N. 5 Pages 859 - 863

Abstract: En | Text: En | PDF: En

The simultaneous determination of two or more active components in pharmaceutical preparations, without previous chemical separation, is a common analytical problem. Published works describe the determination of AZT and 3TC separately, as raw material or in different pharmaceutical preparations. In this work, a method using UV spectroscopy and multivariate calibration is described for the simultaneous measurement of 3TC and AZT in fixed dose combinations. The methodology was validated and applied to determine the AZT+3TC contents in tablets from five different manufacturers, as well as their dissolution profile. The results obtained employing the proposed methodology was similar to methods using first derivative technique and HPLC.

3070 downloads

Sperm ultrastructure of Mytella (Bivalvia) populations from distinct habitats along the northern coast of São Paulo State, Brazil
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Orlandi Introíni, Gisele

; Martins Maester, Fernanda

; Pedini Pereira Leit, Fosca

; Recco-Pimentel, Shirlei Maria

Biocell

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dec 2010, Volume 34 N. 3 Pages 103 - 111

Abstract: En | Text: En | PDF: En

Ultrastructural analyses of bivalve spermatozoa are relevant in studies that aim to identify taxonomic traits for the purposes of discriminating species and conducting phylogenetic studies. In the present work, spermatozoa of mussel specimens of the genus Mytella, collected from two populations living in distinct habitats, were examined by electron microscopy. The objective was to identify sperm ultrastructural taxonomic traits that could be used to differentiate Mytella species. The specimens were from populations that live in intertidal zones on the southeast coast of Brazil, either buried in muddy-sand sediment or anchored to rocky substrates. The acrosomal vesicle was conical and long, the axial rod extended from the nucleus to the acrosome, the nucleus was an oblate spheroid with a condensed chromatin, the intermediate portion contained mitochondria encircling a pair of centrioles, and there was a single flagellum. The sperm was of a primitive type. The spermatozoon ultrastructure did not distinguish the specimens buried in muddy-sand sediment from those anchored to rocky substrates. The data suggest that the specimens analyzed, despite living in distinct habitats, belong to the same species, which conchological analyses identified as M. charruana. The presence of an axial rod in their sperm cells supports the inclusion of M. charruana in the subfamily Mytilinae.

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Mineral composition of Lippia alba (Mill.) N.E. Brown leaves
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Reis, Pedro S. dos

; Estevam, Idalia Helena S.

; Santos, Wagna P. C. dos

; Korn, Maria Graças A.

; David, Jorge M.

; David, Juceni P.

; Araújo, Rennan G. O.

; Pimentel, Maria Fernanda

; Ferreira, Sérgio L. C.

Journal of the Brazilian Chemical Society

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2010, Volume 21 N. 10 Pages 1905 - 1909

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Neste trabalho descreve-se a composição mineral das folhas de Lippia alba (Mill.) que são utilizadas na preparação de chá utilizado na medicina popular. Assim, as folhas da espécie foram coletadas em cidades brasileiras e as amostras foram digeridas usando ácido nítrico e peróxido de hidrogênio em placa aquecedora e, em seguida, foram analisadas empregando espectrometria de emissão óptica com plasma acoplado indutivamente (ICP OES). Para avaliação da exatidão foi utilizado o material de referência certificado, folhas de maçã - NIST SRM 1515. Os resultados demonstraram que cálcio, magnésio e fósforo têm conteúdo médio de 1.950, 2.856 e 2.335 mg 100 g-1 e variações de concentrações de 767-3.887, 314-8.591 e 247-9.214 mg 100 g-1, respectivamente. Os micro-elementos, bário, zinco, cobre, ferro, manganês e níquel têm conteúdos médios de 2,16; 2,95; 0,94; 11,2; 4,25 e 0,09 mg 100 g-1, para variações de concentrações de 0,66-7,1; 1,35-6,3; 0,33-1,7; 0,98-34; 0.82-7,4 e 0,03-0,15 mg 100 g-1, respectivamente. Os dados foram também avaliados usando análise de componentes principais (PCA).

Leaves of Lippia alba (Mill.) N.E. Brown are used for the preparation of tea infusions that are employed in folk medicine. In this paper, the mineral composition of Lippia alba (Mill.) leaves, collected from different Brazilian cities, was evaluated. The samples were digested using nitric acid and hydrogen peroxide on a hot plate and were analyzed using inductively coupled plasma optical emission spectrometry (ICP OES). SRM 1515 apple leaves from NIST were used for checking accuracy. The results demonstrated that calcium, magnesium and phosphorus have average contents of 1,950, 2,856 and 2,335 mg 100 g-1, respectively, and concentration ranges of 767-3,887, 314-8,591 and 247-9,214 mg 100 g-1, respectively. The microelements barium, zinc, copper, iron, manganese and nickel have average contents of 2.16, 2.95, 0.94, 11.2, 4.25 and 0.09 mg 100 g-1, respectively, and concentration ranges of 0.66-7.1, 1.35-6.3, 0.33-1.7, 0.98-34, 0.82-7.4 and 0.03-0.15 mg 100 g−1, respectively. The data were also evaluated using principal component analysis (PCA).

1947 downloads

Sensores ópticos com detecção no infravermelho próximo e médio
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Lima, Kássio M. G.

; Raimundo Jr., Ivo M.

; Silva, Andréa Monteiro S.

; Pimentel, Maria Fernanda

Química Nova

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2009, Volume 32 N. 6 Pages 1635 - 1643

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Optical chemical sensors with detection in the near and mid infrared region are reviewed. Fundamental concepts of infrared spectroscopy and optical chemical sensors are briefly described, before presenting some aspects on optical chemical sensors, such as synthesis of NIR and IR reagents, preparation of new materials as well as application in determinations of species of biological, industrial and environmental importance.

12059 downloads

10.

Recomendações para calibração em Química Analítica parte 2: calibração multianalito
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Pimentel, Maria Fernanda

; Galvão, Roberto Kawakami Harrop

; Araújo, Mário César Ugulino de

Química Nova

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2008, Volume 31 N. 2 Pages 462 - 467

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

This paper is a translation of an IUPAC document by K. Danzer, M. Otto and L. A. Currie (Pure Appl. Chem., 2004, 76(6), 1215-1225). Its goal is to establish a uniform and meaningful standard for terminology (in Portuguese), notation, and formulation concerning multispecies calibration in analytical chemistry. Calibration in analytical chemistry refers to the relation between sample domain and measurement domain (signal domain) expressed by an analytical function x = f s (Q) representing a pattern of chemical species Q and their amounts or concentrations x in a given test sample and a measured function y = f (z) that may be a spectrum, chromatogram, etc. Simultaneous multispecies analyses are carried out mainly by spectroscopic and chromatographic methods in a more or less selective way. For the determination of n species Qi (i=1,2, ..., n), at least n signals must be measured which should be well separated in the ideal case. In analytical practice, the situation can be different.

4192 downloads

11.

Mineral composition of wheat flour consumed in Brazilian cities
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Araujo, Rennan G. O.

; Macedo, Samuel M.

; Korn, Maria das Graças A.

; Pimentel, Maria Fernanda

; Bruns, Roy E.

; Ferreira, Sergio L. C.

Journal of the Brazilian Chemical Society

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2008, Volume 19 N. 5 Pages 935 - 942

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Neste trabalho, foi avaliada a composição mineral da farinha de trigo consumida no Brasil. Na etapa de amostragem foram coletadas 54 amostras em 15 cidades, incluindo as principais cidades brasileiras como: São Paulo, Rio de Janeiro, Salvador, Porto Alegre, Recife e outras. Os elementos determinados foram: cálcio, cobre, magnésio, manganês, ferro, fósforo, potássio e zinco. As amostras foram digeridas usando acido nítrico e peróxido de hidrogênio em sistema aberto. A técnica analítica empregada foi a espectrometria de emissão óptica com plasma indutivamente acoplado (ICP OES). A validação do método (incluindo digestão e determinação) foi confirmada usando um material de referência certificado de farinha de trigo fornecido pelo National Institute of Standards & Technology (NIST). Considerando as 54 amostras analisadas, os resultados demonstraram que os macronutrientes: cálcio, magnésio, potássio e fósforo encontram-se em média de 0,27; 0,35; 1,71 e 1,92 mg g-1, com variação da concentração de 0,11-1,96; 0,19-0,51; 0,76-3,16 e 0,81-7,15 mg g-1, respectivamente. Os micronutrientes: cobre, ferro, manganês e zinco encontram-se em média de 1,84; 37,82; 8,25 e 9,41 µg g-1, com a variação de concentração de 1,00-2,80; 10,46-146,58; 3,89-14,74 e 5,07-13,93 µg g-1, respectivamente. Os resultados foram também avaliados usando as técnicas de análise multivariadas: análise de componente principal (PCA) e análise de agrupamento hierárquico (HCA).

In the present paper, the mineral composition of wheat flour consumed in Brazil was evaluated. In the sampling step 54 samples were collected in 15 cities, including principal Brazilian cities such as: São Paulo, Rio de Janeiro, Salvador, Porto Alegre, Recife and others. The elements determinate were: calcium, copper, magnesium, manganese, iron, phosphorus, potassium and zinc. The samples were digested using nitric acid and hydrogen peroxide in open system. The analytical technique employed was Inductively Coupled Plasma Optical Emission Spectrometry (ICP OES). The method validation (including digestion and determination) was performed using a certified reference material of wheat flour furnished by National Institute of Standards & Technology (NIST). Considering the 54 samples analyzed, the results demonstrated that the macronutrients: calcium, magnesium, potassium and phosphorus have average contents of 0.27, 0.35, 1.71 and 1.92 mg g-1, for concentration ranges of 0.11-1.96, 0.19-0.51, 0.76-3.16 and 0.81-7.15 mg g-1, respectively. The micronutrients: copper, iron, manganese and zinc have average contents of 1.84, 37.8, 8.2 and 9.4 µg g-1, for concentration ranges of 1.00-2.80, 10.5-146.6, 3.9-14.7 and 5.1-13.9 µg g-1, respectively. The results were also evaluated using the multivariate analysis techniques: principal component analysis (PCA) and hierarchical cluster analysis (HCA).

6165 downloads

12.

Macroalgae as lead trapping agents in industrial effluents - a factorial design analysis
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Duarte, Marta M. M. B.

; Silva, José E. da

; Passavante, José Z. de O.

; Pimentel, M. Fernanda

; Barros Neto, Benício de

; Silva, Valdinete L. da

Journal of the Brazilian Chemical Society

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aug 2001, Volume 12 N. 4 Pages 499 - 506

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Um planejamento fatorial de dois níveis foi empregado para analisar a influência da agitação, do tempo de contato, da quantidade de alga e do tipo de pré-tratamento sobre a remoção de metais pesados por algas Arribadas, num sistema em batelada contendo uma solução sintética simulando um efluente típico de fabricação de baterias. Amostras de 4 g de algas secas, moídas e peneiradas removeram 99% do chumbo de amostras de 100 mL do efluente sintético. Os percentuais máximos de remoção de zinco e ferro foram 37% e 80%, respectivamente. Como as algas arribadas são baratas, abundantes e de ocorrência natural, a remoção de chumbo através deste método pode ser vantajosa para aplicação industrial em larga escala.

A two-level factorial design was employed to analyze the influence of agitation, contact time, amount of algae and type of pretreatment on heavy metal removal by Arribadas algae, in a batch system consisting of a synthetic solution simulating a typical effluent from battery manufacturing processes. Dried, ground and sieved 4 g algae samples were able to remove 99 % lead from 100 mL samples of synthetic effluent. Maximum removals for zinc and iron were 37 % and 80 %, respectively. Lead removal using this method is potentially useful for large-scale industrial applications, because Arribadas algae are cheap, abundant, naturally occurring waste materials.

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Glossary and search help

You can enrich your search in a very simple way. Use the search indexes combined with the connectors (AND or OR) and specify more your search.

For example, if you want to search for articles about
cases of dengue in Brasil in 2015, use:
ti:dengue and publication_year:2015 and aff_country:Brasil

See below the complete list of search indexes that can be used:

Index code	Element
ti	article title
au	author
kw	article keywords
subject	subject (title words, abstract and keywords)
ab	abstract
ta	journal short title (e.g. Cad. Saúde Pública)
journal_title	journal full title (e.g. Cadernos de Saúde Pública)
la	publication language code (e.g. pt - Portuguese, es - Spanish)
type	document type
pid	publication identifier
publication_year	publication year of publication
sponsor	sponsor
aff_country	country code of the author's affiliation
aff_institution	author affiliation institution
volume	article volume
issue	article issue
elocation	elocation
doi	DOI number
issn	journal ISSN
in	SciELO colection code (e.g. scl - Brasil, col - Colômbia)
use_license	article usage license code

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