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Pesquisa : D09.698.357 [Categoria DeCS]
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Texto completo SciELO Brasil
Texto completo
Id: biblio-886795
Título: Effect of carbon source on production, characterization and bioactivity of exopolysaccharide produced by Phellinus vaninii Ljup
Fonte: An. acad. bras. ciênc;89(3,supl):2033-2041, 2017. tab, graf.
Idioma: en.
Projeto: National Science Foundation of China.
Resumo: ABSTRACT The effect on different three carbon source (i.e. glucose, fructose and sucrose) on production, chemical characterization and antioxidant activity of exopolysaccharide (EPS) produced by Phellinus vaninii Ljup was investigated in this study. Amongst carbon sources examined, glucose and sucrose were favorable for the mycelia growth, while the maximum EPS yield was achieved when sucrose was employed. The predominant carbohydrate compositions in EPSs identified were gluconic acid, glucose, mannose and galactose acid. Then, FT-IR spectral analysis revealed prominent characteristic groups in EPSs. EPSs molecule exist as nearly globular shape form in aqueous solution. The variation also affects antioxidant activities by investigated by using hydroxyl and DPPH radical scavenging assay. Sucrose was best carbon source from the viewpoint of antioxidant activity due to the relatively high contents of galactose in the EPS with moderate molecular weight and polydispersity.
Descritores: Polissacarídeos Bacterianos/metabolismo
Polissacarídeos Fúngicos
Espectroscopia de Infravermelho com Transformada de Fourier
Responsável: BR1.1 - BIREME

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Id: biblio-1102238
Autor: Rahmani-Nezhad, Samira; Dianat, Shima; Mahdizadeh, Valiollah; Fooladi, Zahra; Hariri, Roshanak; Najafi, Zahra; Firuzi, Omidreza; Vahedi-Mazdabadi, Yasaman; Farjadmand, Fatemeh; Akbarzadeh, Tahmineh; Saeedi, Mina; Ardekan, Mohammadreza Shams.
Título: Investigation of polysaccharide extracts from Iranian and French strains of Agaricus subrufescens against enzymes involved in Alzheimer's disease / Investigación de extractos de polisacáridos de cepas iraníes y francesas de Agaricus subrufescens contra enzimas relevantes para la enfermedad de Alzheimer
Fonte: Bol. latinoam. Caribe plantas med. aromát;18(6):544-554, nov. 2019. tab, ilus.
Idioma: en.
Projeto: Tehran University of Medical Sciences.
Resumo: In this work, the inhibitory activity of a wide range of polysaccharide extracts from two Iranian and French strains of Agaricus subrufescens were evaluated toward acetylcholinesterase (AChE) and butyrylcholinesterase (BChE). Among them, two extracts S9 and S'7 obtained from Iranian and French strains under different extraction conditions showed selective AChE inhibitory activity with IC50 values of 154.63 and 145.43 µg/mL, respectively. It should be noted that all extracts from both strains demonstrated no BChE inhibitory activity. S9 and S'7 were also tested for their effect on amyloid beta (Aß) aggregation, antioxidant activity, and neuroprotectivity. Their activity against Aß aggregation was comparable to that of donepezil as the reference drug but they induced moderate antioxidant activity by DPPH radical scavenging activity and negligible neuroprotectivity against Aß-induced damage.

En este trabajo, se evaluó la actividad inhibitoria de acetilcolinesterasa (AChE) y butirilcolinesterasa (BChE) para varios extractos de polisacáridos de dos cepas iraníes y francesas de Agaricus subrufescens. Los extractos más potentes mostraron valores de IC50 de 154,63 y 145 µg/ml para las cepas iraní (S9) y francesa (S'7), respectivamente, las cuales se obtuvieron de diferentes condiciones de extracción; sin embargo, todos los extractos no mostraron actividad inhibitoria de BChE. Además, S9 y S'7 se probaron para determinar su efecto sobre la agregación de beta-amiloide (Aß), así como su actividad antioxidante y neuroprotectora. Su actividad inhibitoria de la agregación de Aß fue comparable con donepezil, fármaco de referencia, pero indujeron una actividad antioxidante moderada, medida mediante la captación de radicales DPPH, y una neuroprotectora insignificante contra el daño inducido por Aß.
Descritores: Agaricus/química
Doença de Alzheimer/tratamento farmacológico
Amiloide/efeitos dos fármacos
Compostos de Bifenilo
Inibidores da Colinesterase/farmacologia
Fármacos Neuroprotetores
Doença de Alzheimer/enzimologia
Polissacarídeos Fúngicos/farmacologia
Responsável: CL1.1 - Biblioteca Central

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Id: lil-785454
Autor: Lillo, Luis; Cabello, Gerardo; Céspedes, Carlos L; Caro, Claudia A; Pérez, Jerónimo.
Título: Structural studies of the exopolysaccharide produced by a submerged culture of entomopathogenic fungus Metarhizium anisopliae / Estudio estructural del exopolisacárido producido por un cultivo sumergido del hongo entomopatogénico Metarhizium anisopliae
Fonte: Bol. latinoam. Caribe plantas med. aromát;13(4):359-365, jul. 2014. ilus.
Idioma: en.
Projeto: Dirección de Investigación de la Universidad del Bío-Bío; . FONDECYT.
Resumo: The exopolysaccharide (EPS) separated from the entomopathogenic fungus Metarhizium anisopliae was determined by gel permeation chromatography to be homogeneous. The high-performance anion-exchange chromatography with pulsed-amperometric detection (HPAE-PAD) showed a content of monosaccharides D-galactosamine and D-fucose at a molar ratio of about 2:1. The results obtained from Fourier transform-infrared spectroscopy (FT-IR) and second derivative FT-IR spectrum confirmed the proposed structure.

El exopolisacárido (EPS) separado desde el hongo entomopatogénico Metarhizium anisopliae determinado por cromatografía de exclusión en gel ser homogéneo. La cromatografía iónica de alto rendimiento con detección de pulso amperométrico (HPAE-PAD) mostró un contenido de monosacáridos D-galactosamina y D-fucosa en una relación molar de alrededor de 2:1. Los resultados obtenidos desde la espectroscopía infrarroja con transformada de Fourier (FT-IR) y la segunda derivada del espectro FT-IR confirmaron la estructura propuesta.
Descritores: Metarhizium
Polissacarídeos Fúngicos/análise
-Cromatografia por Troca Iônica
Espectroscopia de Infravermelho com Transformada de Fourier
Responsável: CL1.1 - Biblioteca Central

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Texto completo SciELO Brasil
Texto completo
Id: lil-732590
Autor: BRIGHENTI, Fernanda Lourenção; MEDEIROS, Amanda Coelho; MATOS, Bruno Mello; RIBEIRO, Zulene Eveline Abreu; KOGA-ITO, Cristiane Yumi.
Título: Evaluation of caries-associated virulence of biofilms from Candida albicans isolated from saliva of pediatric patients with sickle-cell anemia
Fonte: J. appl. oral sci;22(6):484-489, Nov-Dec/2014. graf.
Idioma: en.
Projeto: São Paulo Research Foundation; . FUNDUNESP.
Resumo: A previous study demonstrated that the amount of Candida spp. in saliva is higher in children with sickle-cell disease. The results from a recent study demonstrate its participation in the etiology of dental caries. Objective This study assessed caries-associated virulence (production of acid, extracellular polysaccharides, proteins and metabolic activity) of biofilms from Candida albicans isolated from saliva of patients with sickle-cell anemia in comparison to isolates obtained from matched healthy children. Material and Methods The isolates were previously obtained from 25 children (4-6 years) and their matched controls (healthy children). One isolate of C. albicans per children was used, totaling 25 isolates per group. The C. albicans biofilms were grown for five days and analyzed regarding the production of lactic acid, extracellular polysaccharides, proteins and metabolic activity. The production of lactic acid was determined by the enzymatic method. The concentration of extracellular polysaccharides was determined by the phenol-sulphuric acid method, and the concentration of the protein was analyzed using the QuantiPro BCA kit. The XTT reduction was used to verify the metabolic activity. The data were analyzed with GraphPad Prism at 5%. Results The Mean±standard deviation for acid production, extracellular polysaccharides, proteins and metabolic activity of isolates from sickle-cell group was, respectively: 7.1±5.0 mmol/L; 15.6±2.5 μg glucose/mg biofilm; 7,503±3,097 μg/mL; A490 3.5±0.7. For isolates from control group the values obtained were: 3.5±3.3 mmol/L; 12.8±3.4 μg glucose/mg biofilm; 4,995±682 μg/mL; A490 3.4±0.5. The C. albicans isolates from patients with sickle-cell anemia produced a significantly greater quantity of acids (p=0.025), polysaccharides (p=0.025) and proteins (p=0.047) compared with the isolates from control group. However, there was ...
Descritores: Anemia Falciforme/complicações
Biofilmes/crescimento & desenvolvimento
Candida albicans/patogenicidade
Cárie Dentária/microbiologia
-Estudos de Casos e Controles
Candida albicans/isolamento & purificação
Índice CPO
Ensaios Enzimáticos
Polissacarídeos Fúngicos/biossíntese
Ácido Láctico/biossíntese
Limites: Criança
Tipo de Publ: Research Support, Non-U.S. Gov't
Responsável: BR1.1 - BIREME

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Texto completo SciELO Brasil
Cury, Altair Antoninha Del Bel
Texto completo
Id: lil-662433
Autor: Silva, Wander José da; Gonçalves, Letícia Machado; Seneviratne, Jayampath; Parahitiyawa, Nipuna; Samaranayake, Lakshman Perera; Cury, Altair Antoninha Del Bel.
Título: Exopolysaccharide matrix of developed candida albicans biofilms after exposure to antifungal agents
Fonte: Braz. dent. j;23(6):716-722, 2012. ilus.
Idioma: en.
Resumo: This study aimed to evaluate the effects of fluconazole or nystatin exposure on developed Candida albicans biofilms regarding their exopolysaccharide matrix. The minimal inhibitory concentration (MIC) against fluconazole or nystatin was determined for C. albicans reference strain (ATCC 90028). Poly(methlymethacrylate) resin (PMMA) specimens were fabricated according to the manufacturer's instructions and had their surface roughness measured. Biofilms were developed on specimens surfaces for 48 h and after that were exposed during 24 h to fluconazole or nystatin prepared in a medium at MIC, 10 x MIC or 100 x MIC. Metabolic activity was evaluated using an XTT assay. Production of soluble and insoluble exopolysaccharide and intracellular polysaccharides was evaluated by the phenol-sulfuric method. Confocal laser scanning microscope was used to evaluate biofilm architecture and percentage of dead/live cells. Data were analyzed statistically by ANOVA and Tukey's test at 5% significance level. The presence of fluconazole or nystatin at concentrations higher than MIC results in a great reduction of metabolic activity (p<0.001). At MIC or 10 x MIC, fluconazole showed high amounts of intracellular polysaccharides (p<0.05), but did not affect the exopolysaccharide matrix (p>0.05). The exposure to nystatin also did not alter the exopolysaccharide matrix at all the tested concentrations (p>0.05). Biofilm architecture was not affected by either of the antifungal agents (p>0.05). Nystatin promoted higher proportion of dead cells (p<0.05). It may be concluded that fluconazole and nystatin above the MIC concentration reduced the metabolic activity of C. albicans biofilms; however, they were not able to alter the exopolysaccharide matrix and biofilm architecture.

Este estudo avaliou o efeito da exposição de fluconazol ou nistatina a biofilmes de Candida albicans desenvolvidos, considerando a matriz de polissacarídeos extracelulares. Inicialmente uma cepa referência de C. albicans (ATCC 90028) foi submetida ao teste de concentração inibitória mínima (CIM) utilizando-se o fluconazol ou nistatina como agentes antifúngicos. Após, espécimes foram confeccionados em resina acrílica de polimetilmetacrilato (PMMA) de acordo com as recomendações do fabricante e tiveram sua rugosidade de superfície padronizada. Após, biofilmes de C. albicans foram desenvolvidos na superfície dos espécimes durante 48 h. Em seguida, os biofilmes foram expostos a fluconazol ou nistatina nas concentrações de CIM, 10 x CIM ou 100 x CIM, por 24 h. A atividade metabólica dos biofilmes foi avaliada pelo teste de XTT. A produção de polissacarídeos extracelulares solúveis e insolúveis, bem como dos polissacarídeos intracelulares foi avaliada pelo método fenol-sulfúrico. A arquitetura dos biofilmes e proporção de células vivas e mortas foi investigada utilizando-se microscopia confocal a laser. Os resultados foram analisados por ANOVA seguido do teste de Tukey, utilizando-se o nível de significância de 5%. A presença do fluconazol ou nistatina em concentrações maiores que CIM resultaram em uma redução significativa da atividade metabólica (p<0,001). Nas concentrações de CIM e 10 x CIM, biofilmes expostos ao fluconazol apresentaram quantidades significativas de polissacarídeos intracelulares (p<0,05), enquanto não houve alterações na quantidade de polissacarídeos extracelulares (p>0,05). A presença de nistatina também não alterou a matriz de polissacarídeos extracelulares em todas as concentrações investigadas (p>0,05). A arquitetura dos biofilmes não foi afetada por ambos os agentes antifúngicos, em qualquer concentração testada (p>0,05). A nistatina apresentou maior proporção de células mortas (p<0,05). Conclui-se que tanto para o fluconazol quanto para a nistatina, concentrações maiores que CIM reduziram a atividade metabólica dos biofilmes de C. albicans; no entanto, tais concentrações não alteraram a matriz de polissacarídeos extracelulares nem a arquitetura dos biofilmes.
Descritores: Antifúngicos/farmacologia
Biofilmes/efeitos dos fármacos
Candida albicans/efeitos dos fármacos
Polissacarídeos Fúngicos/análise
-Antifúngicos/administração & dosagem
Meios de Cultura
Candida albicans/crescimento & desenvolvimento
Fluconazol/administração & dosagem
Polissacarídeos Fúngicos/metabolismo
Hifas/efeitos dos fármacos
Indicadores e Reagentes
Testes de Sensibilidade Microbiana
Microscopia Confocal
Viabilidade Microbiana/efeitos dos fármacos
Nistatina/administração & dosagem
Polimetil Metacrilato/química
Propriedades de Superfície
Fatores de Tempo
Sais de Tetrazólio
Limites: Humanos
Tipo de Publ: Estudo Comparativo
Ensaio Clínico Controlado Aleatório
Research Support, Non-U.S. Gov't
Responsável: BR1.1 - BIREME

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