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Id: biblio-1282553
Autor: Braz, Maria Cleide Azevedo; Saguchi, André Hayato; Akisue, Eduardo; Lira, Adriana de Oliveira; Paiva, Sidnea Aparecida Freitas; Brugnera Junior, Aldo; Macedo, Mary Caroline Skelton; Michelotto, André Luiz da Costa; Araki, Ângela Toshie.
Título: Comparative in vitro study of intracanal Enterococcus faecalis reduction using photosensitizers in aPDT
Fonte: Braz. j. oral sci;20:e214034, jan.-dez. 2021. ilus.
Idioma: en.
Resumo: Aim: To compare Enterococcus faecalis reduction after antimicrobial photodynamic therapy (aPDT) used with methylene blue, toluidine blue, tannin, and curcumin as photosensitizers, an adjunct to endodontic chemomechanical preparation (CMP) in root canals of human teeth. Methods: A total of 120 single-rooted teeth were divided into 6 groups (n = 20): G1- CMP and 2.5% sodium hypochlorite (NaOCl); G2- CMP and saline solution; G3- CMP, 2.5% NaOCl, and aPDT with 0.005% methylene blue; G4- CMP, 2.5% NaOCl, and aPDT with 0.005% toluidine blue; G5- CMP, 2.5% NaOCl, and aPDT with 0.005% tannin; and G6- CMP, 2.5% NaOCl, and aPDT with 0.005% curcumin. A portable semiconductor laser was used (660 nm, 100 mW, 1.8 J, 180s) in groups 1, 2, 3, 4, 5, and a blue LED light-curing (420-480 nm, 1200 mV/cm2 ) in G6. For all groups, a 5 min pre-irradiation time was applied. Samples were collected before (initial collection), immediately after (intermediate collection) and 7 days after CMP (final collection) for colony-forming unit (CFU) counting. The Kruskal-Wallis test and analysis of variance (ANOVA) were performed (p < 0.05; 95% confidence interval). Results: In between-group comparisons, there was no significant difference observed in the number of CFUs at the initial (p >< 0.001) and final collections (p >< 0.001) for G2 and G3. In within-group comparisons, the number of CFUs showed a decreasing trend in G4 (p = 0.007) and G5 (p = 0.001). Conclusion: Photosensitizers promoted E. faecalis reduction, with better results for tannin and curcumin. Alternative photosensitizers should be the focus of further studies.>< 0.05; 95% confidence interval). Results: In between-group comparisons, there was no significant difference observed in the number of CFUs at the initial (p < 0.001) and final collections (p >< 0.001) for G2 and G3. In within-group comparisons, the number of CFUs showed a decreasing trend in G4 (p = 0.007) and G5 (p = 0.001). Conclusion: Photosensitizers promoted E. faecalis reduction, with better results for tannin and curcumin. Alternative photosensitizers should be the focus of further studies.>< 0.001) and final collections (p < 0.001) for G2 and G3. In within-group comparisons, the number of CFUs showed a decreasing trend in G4 (p = 0.007) and G5 (p = 0.001). Conclusion: Photosensitizers promoted E. faecalis reduction, with better results for tannin and curcumin. Alternative photosensitizers should be the focus of further studies>< 0.001) for G2 and G3. In within-group comparisons, the number of CFUs showed a decreasing trend in G4 (p = 0.007) and G5 (p = 0.001). Conclusion: Photosensitizers promoted E. faecalis reduction, with better results for tannin and curcumin. Alternative photosensitizers should be the focus of further studies
Descritores: Fotoquimioterapia
Taninos
Fármacos Fotossensibilizantes
Curcumina
Endodontia
Responsável: BR218.1 - Biblioteca Carlos Henrique Robertson Liberalli


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Id: biblio-950719
Autor: Zia-Ul-Haq, Muhammad; Ahmad, Shakeel; Bukhari, Shazia Anwer; Amarowicz, Ryszard; Ercisli, Sezai; Jaafar, Hawa ZE.
Título: Compositional studies and biological activities of some mash bean (Vigna mungo (L) Hepper) cultivars commonly consumed in Pakistan
Fonte: Biol. Res;47:1-14, 2014. graf, tab.
Idioma: en.
Resumo: BACKGROUND: In recent years, the desire to adopt a healthy diet has drawn attention to legume seeds and food products derived from them. Mash bean is an important legume crop used in Pakistan however a systematic mapping of the chemical composition of mash bean seeds is lacking. Therefore seeds of four mash bean (Vigna mungo (L.) Hepper, family Leguminoseae) cultivars (NARC-Mash-1, NARC-Mash-2, NARC-Mash-3, NARC-Mash-97) commonly consumed in Pakistan have been analyzed for their chemical composition, antioxidant potential and biological activities like inhibition of formation of advanced glycation end products (AGE) activity and tyrosinase inhibition activity. RESULTS: The investigated cultivars varied in terms of biochemical composition to various extents. Mineral composition indicated potassium and zinc in highest and lowest amounts respectively, in all cultivars. The amino acid profile in protein of these cultivars suggested cysteine is present in lowest quantity in all cultivars while fatty acid distribution pattern indicated unsaturated fatty acids as major fatty acids in all cultivars. All cultivars were found to be rich source of tocopherols and sterols. Fourier transform infrared spectroscopy (FTIR) fingerprints of seed flour and extracts indicated major functional groups such as polysaccharides, lipids, amides, amines and amino acids. Results indicated that all investigated cultivars possessed appreciable antioxidant potential. CONCLUSIONS: All cultivars are rich source of protein and possess sufficient content of dietary fiber, a balanced amino acid profile, low saturated fatty acids and antioxidant capacity that rationalizes many traditional uses of seeds of this crop besides its nutritional importance. The collected data will be useful for academic and corporate researchers, nutritionists and clinical dieticians as well as consumers. If proper attention is paid, it may become an important export commodity and may fetch considerable foreign exchange for Pakistan.
Descritores: Sementes/química
Produtos Agrícolas/química
Fabaceae/química
-Paquistão
Fenóis/análise
Riboflavina/análise
Sementes/metabolismo
Esteróis/análise
Taninos/análise
Tiamina/análise
Oligoelementos/análise
Flavonoides/análise
Extratos Vegetais/química
Sequestradores de Radicais Livres
Monofenol Mono-Oxigenase/antagonistas & inibidores
Produtos Finais de Glicação Avançada/metabolismo
Produtos Agrícolas/metabolismo
Substâncias Redutoras/metabolismo
Cisteína/análise
Tocoferóis/análise
Fabaceae/metabolismo
Niacina/análise
Antioxidantes/metabolismo
Valor Nutritivo
Responsável: CL1.1 - Biblioteca Central


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Id: biblio-950720
Autor: Chaudhuri, Dipankar; Ghate, Nikhil Baban; Deb, Shampa; Panja, Sourav; Sarkar, Rhitajit; Rout, Jayashree; Mandal, Nripendranath.
Título: Assessment of the phytochemical constituents and antioxidant activity of a bloom forming microalgae Euglena tuba
Fonte: Biol. Res;47:1-11, 2014. graf, tab.
Idioma: en.
Resumo: BACKGROUND: Unstable generation of free radicals in the body are responsible for many degenerative diseases. A bloom forming algae Euglena tuba growing abundantly in the aquatic habitats of Cachar district in the state of Assam in North-East India was analysed for its phytochemical contents, antioxidant activity as well as free radical scavenging potentials. RESULTS: Based on the ability of the extract in ABTS•+ radical cation inhibition and Fe3+ reducing power, the obtained results revealed the prominent antioxidant activity of the algae, with high correlation coefficient of its TEAC values to the respective phenolic and flavonoid contents. The extract had shown its scavenging activity for different free radicals and 41.89 ± 0.41 µg/ml, 5.83 ± 0.07 µg/ml, 278.46 ± 15.02 µg/ml and 223.25 ± 4.19 µg/ml were determined as the IC50 values for hydroxyl, superoxide, nitric oxide and hypochlorous acid respectively, which are lower than that of the corresponding reference standards. The phytochemical analysis also revealed that the phenolics, flavonoids, alkaloids, tannins and carbohydrates are present in adequate amount in the extract which was confirmed by HPLC analysis. CONCLUSIONS: The results showed that 70% methanol extract of the algae possesses excellent antioxidant and free radical scavenging properties.
Descritores: Extratos Celulares/química
Sequestradores de Radicais Livres/metabolismo
Substâncias Redutoras/metabolismo
Euglena/química
Antioxidantes/metabolismo
-Oxirredução
Fenóis/análise
Ácido Ascórbico/análise
Taninos/análise
Flavonoides/análise
Peroxidação de Lipídeos/efeitos dos fármacos
Cromanos/metabolismo
Cromatografia Líquida de Alta Pressão
Metanol
Alcaloides/análise
Microalgas
Glucose/análise
Índia
Limites: Animais
Masculino
Camundongos
Tipo de Publ: Research Support, Non-U.S. Gov't
Responsável: CL1.1 - Biblioteca Central


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Id: biblio-1095876
Autor: Cáceres, Armando; Martínez-Arévalo, Vicente; Mérida-Reyes, Max S; Sacbajá, Aníbal; López, Alejandra; Cruz, Sully M.
Título: Contenido de oligoelementos y factores antinutricionales de hojas comestibles nativas de Mesoamérica / Content of trace elements and antinutritional factors in edible leaves native to Mesoamerica
Fonte: Cienc. tecnol. salud;6(2):132-148, jul dic 2019. ilus.
Idioma: es.
Resumo: Los oligoelementos son importantes constituyentes nutricionales de las hierbas comestibles. Se colectaron 11 especies, nueve nativas (Amaranthus hybridus, Cnidoscolus aconitifolius, Crotalaria longirostrata, Dysphania ambrosioides, Lycianthes synanthera, Sechium edule, Solanum americanum, S. nigrescens, S. wendlandii) y dos introducidas (Moringa oleifera, Spinacea oleracea) en dos regiones de Guatemala. Se prepararon muestras de la hierba seca, cocida y de caldo de hierba fresca. Se cuantificaron por espectrofotometría de absorción atómica los macro (N, P, K) y oligoelementos (Ca, Mg, Na, Cu, Zn, Mn), taninos por espectrofotometría y oxalatos por permanganimetría. El contenido de oligoelementos es diverso, para Zn, la hierba control S. oleracea contienen buena cantidad (90-140 ppm); de las nativas D. ambrosioides (130-160 ppm) y A. hybridus (70-80 ppm) tienen la mayor cantidad. Respecto a Fe las hierbas control tienen buena composición (S. oleracea, 220-280 ppm y M. oleifera, 105-135 ppm); de las nativas A. hybridus (90-240 ppm), C. aconitifolius (75-185 ppm) y L. synanthera (75-140 ppm) tienen buenas concentraciones. Se encontraron niveles elevados de oxalatos en S. oleracea (67.30 (5.51) mg/g), L. synanthera (56.30 (9.67) mg/g) y S. nigrescens (33.6 (5.48) mg/g); en las demás hierbas se encontraron niveles menores. Los niveles de taninos fueron bajos (0.1-0.8 mg/g) para todas las especies. Se demuestra que cuatro especies nativas tienen un buen contenido de oligoelementos y presentan valores menores de antinutricionales que los controles.

Trace elements are important nutritional constituents from edible herbs. Eleven species were collected in two regions of Guatemala, nine native (Amaranthus hybridus, Cnidoscolus aconitifolius, Crotalaria longirostrata, Dysphania ambrosioides, Lycianthes synanthera, Sechium edule, Solanum americanum, S. nigrescens, S. wendlandii) and two introduced (Moringa oleifera, Spinacea oleracea). Dry, cooked and broth samples were prepared. By atomic absorption spectrometry, macro (N, P, K) and trace elements (Ca, Mg, Na, Cu, Zn, Mn) were quantified, tannins by spectrophotometry, and oxalates by permanganometry. Trace elements content is diverse, for Zn, control herb S. oleracea contained high quantity (90-140 ppm); from the natives D. ambrosioides (130-160 ppm) and A. hybridus (70-80 ppm) contained high amounts. For Fe, control herbs had high composition (S. oleracea, 220-280 ppm, M. oleifera, 105-135 ppm); from the natives A. hybridus (90-240 ppm), C. aconitifolius (75-185 ppm) and L. synanthera (75-140 ppm) had the highest amounts. High levels of oxalates were demonstrated in S. oleracea (67.30 (5.48) mg/g), L. synanthera (56.30 (9.67) mg/g), and S. nigrescens (33.6 (5.48) mg/g); from the others levels.
Descritores: Oligoelementos/análise
Verduras/classificação
-Taninos/análise
Oligoelementos/administração & dosagem
Amaranthus/química
Jatropha/química
Desnutrição/prevenção & controle
Responsável: GT49.1


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Id: biblio-950753
Autor: Zeb, Anwar; Sadiq, Abdul; Ullah, Farhat; Ahmad, Sajjad; Ayaz, Muhammad.
Título: Phytochemical and toxicological investigations of crude methanolic extracts, subsequent fractions and crude saponins of Isodon rugosus
Fonte: Biol. Res;47:1-6, 2014. tab.
Idioma: en.
Resumo: BACKGROUND: Isodon rugosus is used traditionally in the management of hypertension, rheumatism, tooth-ache and pyrexia. Present study was arranged to investigate I. rugosus for phytoconstituents, phytotoxic and cytotoxic activities to explore its toxicological, pharmacological potentials and to rationalize its ethnomedicinal uses. Briefly, qualitative phytochemical analysis of the plant extracts were carried out for the existence of alkaloids, flavonoids, saponins, oils, glycosides, anthraquinones, terpenoids, sterols and tannins. Plant crude methanolic extract (Ir.Cr), its subsequent fractions; n-hexane (Ir.Hex), chloroform (Ir.Chf), ethyl acetate (Ir.EtAc), aqueous (Ir.Aq) and saponins (Ir.Sp) in different concentrations were tested for phytotoxic and cytotoxic activities using radish seeds and brine shrimps (Artemia salina) respectively. The phytotoxic activity was determined by percent root length inhibition (RLI) and percent seeds germination inhibition (SGI) while the cytotoxicity was obtained with percent lethality of the brine shrimps. RESULTS: Ir.Cr was tested positive for the presence of alkaloids, glycosides, flavonoids, oils, terpenoids, saponins, tannins and anthraquinones. Among different fractions Ir.Sp, Ir.Chf, Ir.EtAc, and Ir.Cr were most effective causing 93.55, 89.32, 81.32 and 58.68% inhibition of seeds in phytotoxicity assay, with IC50 values of 0.1, 0.1, 0.1 and 52 µg/ml respectively. Similarly, among all the tested samples, Ir.Sp exhibited the highest phytotoxic effect causing 91.33% root length inhibition with IC50 of 0.1 µg/ml. Ir.Sp and Ir.Chf were most effective against brine shrimps showing 92.23 and 76.67% lethality with LC50 values of 10 and 12 µg/ml respectively. CONCLUSIONS: It may be inferred from the current investigations that I. rugosus contains different secondary metabolites and is a potential source for the isolation of natural anticancer and herbicidal drug molecules. Different fractions exhibited phytotoxic and cytotoxic activities, thus providing pharmacological basis for ethnomedicinal uses of this plant.
Descritores: Saponinas/análise
Extratos Vegetais/farmacologia
Isodon/química
Fitoterapia
-Artemia/efeitos dos fármacos
Taninos/análise
Terpenos/análise
Flavonoides/análise
Óleos Vegetais/análise
Clorofórmio
Antraquinonas/análise
Raízes de Plantas/crescimento & desenvolvimento
Citotoxinas
Componentes Aéreos da Planta/química
Metanol
Alcaloides/análise
Glicosídeos/análise
Hexanos
Limites: Animais
Responsável: CL1.1 - Biblioteca Central


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Id: biblio-1129304
Autor: Vieira, Laura Valadão; Schmidt, Ana Paula; Barbosa, Antônio Amaral; Feijó, Josiane de Oliveira; Brauner, Cássio Cassal; Rabassa, Viviane Rohrig; Corrêa, Marcio Nunes; Schmitt, Eduardo; Del Pino, Francisco Augusto Burkert.
Título: Utilização de taninos como aditivo nutricional na dieta de ruminantes / Use of tannins as a nutritional additive for ruminants / Uso de taninos como aditivo nutricional en dieta de rumiantes
Fonte: Arq. Ciênc. Vet. Zool. UNIPAR (Online);23(1, cont.):e2306, 20200000. tab.
Idioma: pt.
Resumo: Os taninos são compostos fenólicos presentes em plantas, classificados quanto à estrutura química em compostos hidrolisáveis e condensados. Os condensados são adicionados à dieta de ruminantes devido a sua capacidade de formar complexos com proteínas tornando-as não degradáveis no ambiente ruminal. Dessa forma, aumenta o aporte proteico no intestino delgado onde ocorrerá a maior absorção na porção cranial do órgão, o duodeno. A vantagem desse mecanismo é aumentar o aproveitamento da proteína da dieta pelos animais o que influenciará na produtividade e sistema imunológico, entre outros. Os efeitos positivos com a utilização desse composto como aditivo nutricional ainda precisam ser estudados, portanto, o objetivo dessa revisão consiste em demonstrar os resultados, até então conhecidos, da utilização de taninos condensados na dieta de ruminantes.(AU)

Tannins are phenolic compounds present in plants. According to their chemical structure, they can be classified into hydrolysable and condensed compounds. Condensed compounds are added to the ruminant nutrition due to their ability to form complexes with proteins, rendering them as non-degradable in the rumen environment. Thus, it increases the protein supply in the small intestine, where the highest absorption will occur in the duodenum, the cranial portion of the organ. The advantage of this mechanism is the increase of the use of dietary protein by the animals, which will thus influence productivity and the immune system, among others. The positive effects of the use of this compound as a nutritional additive still need to be further investigated, therefore, the purpose of this review is to demonstrate the known results of the use of condensed tannins in the diet of ruminants.(AU)

Los taninos son compuestos fenólicos presentes en plantas, clasificados según la estructura química en compuestos hidrolizables y condensados. Los condensados se agregan a la dieta de rumiantes debido a su capacidad de formar complejos con proteínas, haciéndolas no degradables en el entorno del rumen. Así, aumenta el aporte proteico en el intestino delgado donde habrá mayor absorción en la porción craneal del órgano, el duodeno. La ventaja de ese mecanismo es aumentar el aprovechamiento de la proteína de la dieta por los animales, lo que influirá en la productividad y sistema inmunológico, entre otros. Los efectos positivos con la utilización de ese compuesto, como aditivo nutricional, todavía necesita ser estudiado, el objetivo de esa revisión consiste en demostrar los resultados, hasta ahora conocidos, del uso de taninos condensados en la dieta de rumiantes.(AU)
Descritores: Taninos
Ruminantes
Proteínas na Dieta
Proteínas
Aditivos Alimentares
Limites: Animais
Bovinos
Responsável: BR68.1 - Biblioteca Virginie Buff D'Ápice


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Id: biblio-1129706
Autor: Parreira Filho, J. M; Fernandes, E. A; Guimarães, R. F. M; Oliveira, C. B; Freitas, B. B. B; Santana, L. F; Fudimoto, C; Parreira, I. F. B; Oliveira, P. M. L.
Título: Substituição do milho pelo sorgo sobre o desempenho zootécnico e na digestibilidade em coelhos / Replacement of corn by sorghum on zootechnical performance and digestibility in rabbits
Fonte: Arq. bras. med. vet. zootec. (Online);72(3):993-999, May-June, 2020. tab.
Idioma: pt.
Resumo: O milho é a principal fonte de energia nas dietas animais. Em algumas regiões brasileiras, sua disponibilidade, principalmente na entressafra, é insuficiente para atender à demanda, fazendo com que seu preço se eleve. Neste estudo, objetivou-se avaliar a substituição do milho pelo sorgo sobre o desempenho zootécnico e a digestibilidade em coelhos. Foram utilizados 60 animais machos da raça Nova Zelândia Branco, divididos em três tratamentos: ração base milho (TM); ração base sorgo (TS) e ração base 50% de milho + 50% de sorgo (TMS). No ensaio de desempenho, avaliou-se ganho de peso (GP), consumo de ração (CR), conversão alimentar (CA), coeficientes de digestibilidade da matéria seca (CDMS), proteína bruta (CDPB), fibra em detergente neutro (CDFDN) e fibra em detergente ácido (CDFDA). Observou-se que o CRM, a CA e o GPM não foram afetados pela substituição do milho pelo sorgo, nos níveis de 50% e 100%. Os resultados de digestibilidade demonstraram maiores CDPB e CDFDN na ração base milho, não havendo diferenças entre os demais parâmetros estudados. O sorgo com baixo teor de tanino pode ser usado nas rações de crescimento de coelhos em níveis de substituição de 50% ou 100% da participação do milho, sem prejuízos para o desempenho zootécnico e a digestibilidade.(AU)

Corn is the main source of energy in animal diets. In some Brazilian regions, its availability, especially in the off-season, may be insufficient to meet demand, which causes prices to increase. In this context, the aim of this study was to evaluate the substitution of maize by sorghum on the performance and digestibility of rabbits. Sixty New Zealand White bucks were used, divided in three treatments, maize base ration (TM); based on grain sorghum ration (TS) and base ration 50% corn + 50% sorghum grain (TMS). In the performance test, weight gain (GP), feed intake (CR) and feed conversion ratio (CA) were evaluated. In the digestibility assay, 21 animals were used. The total dry matter (CDMS), crude protein (CDPB), gross energy (EB), neutral detergent fiber (CDFDN) and acid detergent fiber (CDFDA) coefficients were evaluated. There was no significant difference for any of the performance parameters studied (P > 0.05). The digestibility results showed higher CDPB and CDFDN in the corn diet (P <0.05), with no differences between the other parameters studied. Low tannin sorghum can be used in rabbit growth diets at substitution levels of 50% or 100% of maize participation without impairing zootechnical performance and digestibility.(AU)
Descritores: Taninos
Zea mays
Sorghum
Ração Animal
Limites: Animais
Coelhos
Responsável: BR68.1 - Biblioteca Virginie Buff D'Ápice


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Id: biblio-886812
Autor: OLIVEIRA, FERNANDO A DE; RORATO, VANESSA C; ALMEIDA-APOLONIO, ADRIANA A; RODRIGUES, ALLAN B; BARROS, ALINE L DE; SANGALLI, ANDRÉIA; ARENA, ARIELLE C; MOTA, JONAS S; GRISOLIA, ALEXÉIA B; OLIVEIRA, KELLY M P DE.
Título: In vitro antifungal activity of Myracrodruon urundeuva Allemão against human vaginal Candida species
Fonte: An. acad. bras. ciênc;89(3,supl):2423-2432, 2017. tab.
Idioma: en.
Resumo: ABSTRACT Myracrodruon urundeuva is a plant native to Brazil, which is used by the indigenous population for the treatment of candidiasis. The aims of this study were to evaluate the antifungal activity of extract against human vaginal Candida species and evaluate the possible toxicological activities of M. urundeuva. Initially, ethanol extracts, ethyl acetate fractions, and hydroalcoholic fractions of the bark and leaf of M. urundeuva were used to determine the minimum inhibitory concentration. The extracts that showed antifungal activity were characterized by liquid chromatography and subjected to toxicity assessment. Toxic, cytotoxic, genotoxic, and mutagenic testing were performed using Allium cepa and Ames assays with the ethanol extracts of the bark and leaves. Hemolytic activity was evaluated in erythrocytes and acute toxicity in rats. The ethanol bark extracts showed best activity against Candida albicans, C. krusei, and C. tropicalis ATCC (4-512 µg/mL). Chemical characterization indicated the presence of flavonoids and tannins in the extracts. Hemolytic activity, genotoxicity, and mutagenicity were not observed. The results of the Ames and A. cepa tests were also in agreement, ethanol bark extracts and ethanol leaf extracts of M. urundeuva showed absence of mutagenic activity. Similar results were observed in the A. cepa assay and acute toxicity test in rats. M. urundeuva bark extracts showed potential for the treatment of vaginal infections caused Candida species, as a topical.
Descritores: Candida albicans/efeitos dos fármacos
Extratos Vegetais/farmacologia
Folhas de Planta/química
Anacardiaceae/química
Antifúngicos/farmacologia
-Taninos/farmacologia
Flavonoides/farmacologia
Brasil
Testes de Sensibilidade Microbiana
Casca de Planta/química
Antifúngicos/isolamento & purificação
Limites: Humanos
Animais
Feminino
Ratos
Responsável: BR1.1 - BIREME


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Id: biblio-886826
Autor: SILVEIRA, AMANDA G DA; SANTINI, ELIO J; KULCZYNSKI, STELA M; TREVISAN, RÔMULO; WASTOWSKI, ARCI D; GATTO, DARCI A.
Título: Tannic extract potential as natural wood preservative of Acacia mearnsii
Fonte: An. acad. bras. ciênc;89(4):3031-3038, Oct.-Dec. 2017. tab.
Idioma: en.
Resumo: ABSTRACT High toxicity of the preservatives most frequently used in wood treatment and the resulting risks of handling pose a threat to small producers and to the environment. In an attempt to mitigate these problems, the present study was conducted with the objective of evaluating the preservative effect of tannic extract on biodeterioration of Acacia mearnsii wood. For this purpose, untreated and preserved specimens, some with tannin extract and some with a preservative mixture based on CCB (Chromated Copper Borate), were submitted to accelerated rotting trials with the fungus that causes white rot (Pycnoporus sanguineus) for 16 weeks. The evaluations were made with a basis on weight loss and chemical components analysis, and they showed that the natural resistance of Acacia wood is moderate when exposed to the white rot fungus. The tannin concentrations showed similar effects to those of the CBB mixture in all evaluations, i.e., they significantly increased the biological resistance of the material, which started to be classified as very resistant to the fungus. Overall, the results suggest that tannin can be considered as a potential natural preservative product.
Descritores: Taninos/farmacologia
Madeira/efeitos dos fármacos
Biodegradação Ambiental/efeitos dos fármacos
Acacia/microbiologia
Pycnoporus/efeitos dos fármacos
-Pycnoporus/fisiologia
Responsável: BR1.1 - BIREME


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Fotocópia
Id: lil-107236
Autor: Haro Haro, Daniel Enrique; Yoshiyama T., Jorge; Chafloque Augusto B.; Carbone F., Angel.
Título: Síndrome oftalmológico de la `Pepa de Chirimoya' / Ophtalmologic syndrome of `Pepa de Chirimoya'
Fonte: Rev. peru. oftalmol;9(2):16-8, 1983.
Idioma: es.
Descritores: Taninos/uso terapêutico
Dermatopatias Vesiculobolhosas/tratamento farmacológico
Doenças da Córnea/classificação
Responsável: PE1.1 - Oficina Universitária de Biblioteca



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