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Your search keyword '"Dalva Trevisan Ferreira"' showing total 5 results
Start Over Author "Dalva Trevisan Ferreira" Topic phytochemical
5 results on '"Dalva Trevisan Ferreira"'

1. Phytochemical and antifungal activity of anthraquinones and root and leaf extracts of Coccoloba mollis on phytopathogens

Author

Iuri Bezerra de Barros, Juliana Feijó de Souza Daniel, Jurandir Pereira Pinto, Maria Inês Rezende, Raimundo Braz Filho, and Dalva Trevisan Ferreira

Subjects
Antifungal, Phytochemical, Lasiodiplodia, Botryosphaeria, Coccoloba mollis, Biotechnology, TP248.13-248.65
Abstract

The aim of this work was to study the phytochemical and antifungal activity of anthraquinones and root and leaf extracts of Coccoloba mollis on phytopathogens. The chemical analysis of ethanolic extracts showed a mixture of long-chain hydrocarbons, carboxyl esters and 3-taraxerone in the leaf extract. Two anthraquinones (emodin and physcion) were isolated and identified from the root extract. Phytochemical screening using the pharmacognostic methods revealed the presence of flavonoids and tannins in the leaves and roots. Anthraquinones were only found in the root extract, no alkaloids, coumarins, saponins and simple phenolics were present. The antifungal activity of C. mollis extracts and anthraquinones isolated from the root of this plant against Botryospheria ribis, B. rhodina, Lasiodiplodia theobromae and Fusarium sp showed promising results for their use as fungicides, where emodin was the most active compound, which inhibited the microorganisms tested up to 44%.

Published
2011
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2. Toxicity, antioxidant activity and phytochemical characterization of Coccoloba mollis roots and leaves

Author

Iuri Bezerra de Barros, Queli Cristina Fidelis, Juliana Feijo de Souza Daniel, Jurandir Pereira Pinto, Audrey Alesandra Stinhen Garcia Lonni, Gideão Silva Ribeiro, Raimundo Braz- Filho, Norton Resende de Araújo, and Dalva Trevisan Ferreira

Subjects
Toxicity, Antioxidant activity, Artemia salina, Phytochemical, Coccoloba mollis, Technology (General), T1-995, Science (General), Q1-390
Abstract

Coccoloba mollis is a plant that is used in medicine in Londrina, Brazil. The root extract showed stronger activity against A. salina (68.5 μg/mL) than did the leaf extract (1342 μg mL), and demonstrated good activity when compared with the positive control (16.24 μg /mL). The antioxidant potential (Diphenylpicrylhydrazyl – DPPH) of root and leaf extracts was comparable to that of commonly used BHT (butylated hydroxytoluene). In the chemical characterization the compounds identified were a mixture of long chain hydrocarbons, carboxyl esters and 3-taraxerone from leaf ethanolic extract and two anthraquinones (emodin and physcion) from the root one. Phytochemical screening using pharmacognostic methodology revealed the presence of flavonoids and tannins in leaves and roots. Anthraquinones only in the roots. While this analysis resulted negative for alkaloids, coumarins, saponins and simple phenolics. We conclude that the identified emodin and physcion in roots extract, corroborate with the anti-stress action and the use for memory loss attributed by popular use of this medicinal plant in the Londrina region.

Published
2010

3. Diterpenos, triterpenos e esteróides das flores de Wedelia paludosa

Author

Mário Geraldo de Carvalho, Terezinha de Jesus Faria, Raimundo Braz-Filho, Geizi Jane Alves de Carvalho, and Dalva Trevisan Ferreira

Subjects
Stigmasterol, beta-O-acyloleanoic acids, General Chemistry, Biology, biology.organism_classification, Wedelia, Terpene, lcsh:Chemistry, chemistry.chemical_compound, Chemistry, Phytochemical, chemistry, lcsh:QD1-999, Botany, Spectral data, kaurenoic acids, QD1-999, Wedelia paludosa
Abstract

Phytochemical investigation of the flowers of Wedelia paludosa afforded two diterpenes, ent-kaur-16-en-19-oic acid and ent-kaur-9(11),16-dien-19-oic acid, three acylated triterpenes, 3beta-O-hexa-decanoylolean-12-en-28-oic acid, 3beta-O-pentadecanoylolean-12-en-28-oic acid and 3beta-O-tetradecanoylolean-12-en-28-oic acid, and three steroids, stigmasterol, 3beta-O-beta-D-glycopyranosyl sitosterol and 3beta-O-beta-D-glycopyrano-sylstigmasterol. The substances were identified by their spectral data.

Published
2001

4. Antimicrobial activity and chemical investigation of Brazilian Drosera

Author

Halha Ostrensky Saridakis, Kátia Eliane Carvalho, Raimundo Braz-Filho, Silvio Luiz Machado, Juliana Feijó de Souza Daniel, Dalva Trevisan Ferreira, César Cornélio Andrei, Terezinha de Jesus Faria, Elisângela Vinhato, and Dennis Panayotis Saridakis

Subjects
Microbiology (medical), lcsh:Arctic medicine. Tropical medicine, Drosera, lcsh:RC955-962, lcsh:QR1-502, Ethyl acetate, Microbial Sensitivity Tests, Gram-Positive Bacteria, lcsh:Microbiology, Drosera species, chemistry.chemical_compound, aliphatic compounds, Botany, Candida albicans, Gram-Negative Bacteria, Droseraceae, plumbagin, antimicrobial activity, biology, Villosa, Plant Extracts, Plumbagin, Antimicrobial, biology.organism_classification, Anti-Bacterial Agents, stomatognathic diseases, Phytochemical, chemistry, Enterococcus faecium
Abstract

The antimicrobial activity of three different extracts (hexanic, ethyl acetate, methanol) obtained from Brazilian Drosera species (D. communis, D. montana var. montana, D. brevifolia, D. villosa var. graomogolensis, D. villosa var. villosa, Drosera sp. 1, and Drosera sp. 2 ) were tested against Staphylococcus aureus (ATCC 25923), Enterococcus faecium (ATCC23212), Pseudomonas aeruginosa (ATCC27853), Escherichia coli (ATCC11229), Salmonella choleraesuis (ATCC10708), Klebsiella pneumoniae (ATCC13883), and Candida albicans (a human isolate). Better antimicrobial activity was observed with D. communis and D. montana var. montana ethyl acetate extracts. Phytochemical analyses from D. communis, D. montana var. montana and D. brevifolia yielded 5-hydroxy-2-methyl-1,4-naphthoquinone (plumbagin); long chain aliphatic hydrocarbons were isolated from D. communis and from D. villosa var. villosa, a mixture of long chain aliphatic alcohols and carboxylic acids, was isolated from D. communis and 3b-O-acetylaleuritolic acid from D. villosa var. villosa.

Published
2004

5. Differentiation of species of the Baccharis genus by HPLC and chemometric methods

Author

Lucas M. C. Silva, Ieda Spacino Scarminio, Dalva Trevisan Ferreira, and Audrey Alesandra Stinghen Garcia Lonni

Subjects
Principal Component Analysis, Chromatography, Training set, biology, Baccharis, Chemistry, Asteraceae, Plant Components, Aerial, biology.organism_classification, High-performance liquid chromatography, Analytical Chemistry, Chemometrics, Phytochemical, Species Specificity, Genus, Principal component analysis, Chromatography, High Pressure Liquid
Abstract

Phytochemical investigation of the aerial parts of three Baccharis species (Asteraceae family) was performed using HPLC and chemometric methods, with the objective of distinguishing between three morphologically very similar species: Baccharis genistelloides Persoon var. trimera (Less.) DC, B. milleflora (Less.) DC and B. articulata (Lam.) Persoon. With the help of Principal Component Analysis (PCA) and variance weights, it was possible to characterize the chromatographic profiles of the alcoholic extracts of the three species. Application of Soft Independent Modeling of Class Analogy (SIMCA) and K-Nearest Neighbor (KNN) methods on a training set of 74 extracts resulted in models that correctly classified all eight samples in an independent test set.

Published
2003

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