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Search Results: 1 - 10 of 181588 matches for " Telma Leda Gomes de Lemos "
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Ximenia americana: Chemical and Spectral Studies of Extracts of Seeds. Analysis of Trimethylsilyl Derivatives by Gas Chromatography and Mass Spectrometry  [PDF]
Romézio Alves Carvalho da Silva, Telma Leda Gomes de Lemos, Daniele Alves Ferreira, Francisco José Queiroz Monte
American Journal of Analytical Chemistry (AJAC) , 2016, DOI: 10.4236/ajac.2016.72016
Abstract: Among the numerous botanical species found in the Brazilian plant biome, Ximenia americana is widespread in the Northeast of Brazil, especially in the state of Ceará, where it is known as bush plum. Its bark, leaves and roots are used in popular medicine for the treatment of skin infections, hemorrhoids, stomach ulcers, gastric pain, among others. In this work, hexane and ethanolic extracts of X. americana seeds were subjected to silylation reactions followed by analysis of the silylated derivatives by gas chromatography-mass spectrometry (GC/MS). In the hexane extract, 18 substances were identified, where the most abundant and most important components were the Octadec-9-enoic (38.14%), (9Z,12Z)-Octadec-9,12-dienoic (18.83%), Ethanedioic (8.21%) and (Z,Z,Z)-9,12,15-Octadecatrienoic (7.22%) acids. From the ethanol extract 18 substances were also identified having D-Sucrose (29.36%), L-Sorbose (9.19%), syllo-Inositol (8.34%) and D-Glucose (7.45%) as the main components. In addition, the presence of a steroid in hexane extract and triterpenes in ethanol extract was recorded. The constituents were identified using chromatographic and spectrometric methods, especially gas chromatography-mass spectrometry. To our knowledge, this is the first study of this nature from the oil of the X. american seeds.
Chemical Constituents from Caesalpinia férrea: Identification and 1H and 13C Resonance Assignment  [PDF]
Islay Lima Magalh?es, Francisco Chagas Lima Pinto, Raimundo Braz Filho, Daniele Alves Ferreira, Telma Leda Gomes de Lemos, Francisco José Queiroz Monte
American Journal of Analytical Chemistry (AJAC) , 2014, DOI: 10.4236/ajac.2014.510077
Abstract: In a phytochemical investigation of Caesalpinia ferrea (Leguminosae), four aromatic compounds (1-4) have been isolated and identified. Their structures have been assigned based on data provided by spectroscopic techniques, including 2D NMR experiments. Compounds 3 and 4 are being reported for the first time for Cesalpina ferrea.
Estudo químico de uma amostra de própolis verde de Passa Quatro, Minas Gerais, Brasil
Tavares, Leonardo Carvalho;Lemos, Telma Leda Gomes de;Arriaga, Angela Martha Campos;Santiago, Gilvandete Maria Pinheiro;Braz-Filho, Raimundo;
Química Nova , 2010, DOI: 10.1590/S0100-40422010001000009
Abstract: the phytochemical investigation of a sample of propolis from passa quatro-minas gerais state, brazil, where nine constituents were isolated: a mixture of α- and β-amyrin, lupeol, a mixture of flavonols ramnocitrin and eupalitin, acacetin, 3-prenyl-4-hydroxycinnamic acid, 3,5-diprenyl-4-hydroxycinnamic acid the new compound, the (e)-3-[4-(3-phenylpropanoiloxy)]-3,5-diprenil-cinnamic acid. the structures of the isolated compounds were characterized by 1d- and 2d-nmr experiments, ms and ir spectrometry, and comparison with data described in the literature.
Antiplaque and antigingivitis effects of a gel containing Punica granatum Linn extract: a double-blind clinical study in humans
Salgado, Alexandre Daher Yunes;Maia, Juliana Lemos;Pereira, Sérgio Luís da Silva;Lemos, Telma Leda Gomes de;Mota, Olívia Morais de Lima;
Journal of Applied Oral Science , 2006, DOI: 10.1590/S1678-77572006000300003
Abstract: objectives: the antiplaque and antigingivitis effects of a gel containing 10% punica granatum linn extract were evaluated using a 21-day partial-mouth experimental model of gingivitis. methods: 23 volunteers participated in this cross-over, double-blind study, carried out in 2 phases of 21 days each. for each period of the experiment, an acrylic toothshield was made for each volunteer to carry the test or placebo gel as well as to avoid brushing of the 4 experimental teeth (posterior teeth in the lower left quadrant). the subjects were randomly assigned to use either the placebo gel (control group) or the test gel (experimental group) and were instructed to brush the remaining teeth normally 3 times a day. on days 0 and 21, the visible plaque index (vpi) and gingival bleeding index (gbi) were recorded. results: the results did not show statistically significant difference between control and experimental groups for either of the indices (vpi and gbi). conclusion: the gel containing 10% punica granatum linn extract was not efficient in preventing supragingival dental plaque formation and gingivitis.
Avalia??o de macro e microminerais em frutas tropicais cultivadas no nordeste brasileiro
Almeida, Maria Mozarina Beserra;Sousa, Paulo Henrique Machado de;Fonseca, Maria Luciana;Magalh?es, Carlos Emanuel Carvalho;Lopes, Maria de Fátima Gomes;Lemos, Telma Leda Gomes de;
Ciência e Tecnologia de Alimentos , 2009, DOI: 10.1590/S0101-20612009000300020
Abstract: brazil has great importance in the fruits market; however, data on the composition of brazilian tropical fruits, mainly of those produced in the northeast region, is scarce. in the present study, it was determined the macro- and micro-minerals of 11 tropical fruits cultivated in the northeast of brazil: pineapple, sweetsop, soursop, jackfruit, papaya, mangaba, murici, sapodilla, ciruela, tamarind, and umbu. the samples were dehydrated and mineralized in hno3/hclo4 (3:1) solution. the minerals ca, mg, mn, zn, fe, co, se and ni were analyzed by atomic absorption spectrophotometry; na and k by flame photometry; and p by the colorimetric method. the results indicated that tamarind is a rich source of all minerals available, especially of mg, cu and k, in addition to being a good source of ca, p, fe, and se. among the minerals evaluated in this study, k presented the highest content, followed by ca and mg. sweetsop, soursop, sapodilla, and murici are good sources of two or more minerals. high correlations were obtained between k and the minerals p, co, and fe and between co and fe. therefore, the consumption of the studied tropical fruits is suggested as an assistant to the reposition of mineral nutrients.
Chemical composition of the essential oils from two subspecies of Protium heptaphyllum
Marques, Delcio Dias;Sartori, Rogério Ant?nio;Lemos, Telma Leda Gomes;Machado, Luciana Lucas;Souza, Jo?o Sammy Nery de;Monte, Francisco José Queiroz;
Acta Amazonica , 2010, DOI: 10.1590/S0044-59672010000100029
Abstract: qualitative and quantitative analyses of the volatile constituents from resin of protium heptaphyllum (aubl.) marchand subsp. ulei (swat) daly (phu), and protium heptaphyllum (aubl.) marchand subsp. heptaphyllum (phh), burseraceae were performed using gc-ms and gc-fid. the resins were collected around the city of cruzeiro do sul, state of acre, brazil. essential oils from the two subspecies were extracted by hydrodistillation with a yield of 8.6% (phu) and 11.3% (phh); the main components were terpinolene (42.31%) and p-cymene (39.93%) for subspecies ulei (phu) and heptaphyllum (phh), respectively.
Chemoprevention with green propolis green propolis extracted in L-lysine versus carcinogenesis promotion with L-lysine in N-Butyl-N-[4-hydroxybutyl] nitrosamine (BBN) induced rat bladder cancer
Dornelas, Concei??o Aparecida;Fechine-Jamacaru, Francisco Vagnaldo;Albuquerque, Irineu Lima;Magalh?es, Hemerson Iury Ferreira;Souza, Adjair Jairo Silva de;Alves, Leonardo Alcantara;Almeida, Paulo Roberto Carvalho de;Lemos, Telma Leda Gomes de;Castro, José Daniel Vieira de;Moraes, Maria Elisabete Amaral;Moraes, Manoel Odorico;
Acta Cirurgica Brasileira , 2012, DOI: 10.1590/S0102-86502012000200015
Abstract: purpose: to determine the effects of green propolis extracted in l-lysine (wsdp) and of l- lysine for 40 weeks on induced rat bladder carcinogenesis. methods: the animals (groups i, ii, iii, iv, v and vi) received bbn during 14 weeks. group i was treated with propolis 30 days prior received bbn, and then these animals were treated daily with propolis; groups ii and iii was treated with subcutaneous and oral propolis (respectively) concurrently with bbn. the animals of group iv were treated l-lysine; group v received water subcutaneous; and group vi received only to bbn. among the animals not submitted to carcinogenesis induction, group vii received propolis, group viii received l-lysine and group ix received water. results: the carcinoma incidence in group i was lower than that of control (group vi). the carcinoma multiplicity in group iv was greater than in group vi. all animals treated with l-lysine developed carcinomas, and they were also more invasive in group iv than in controls. on the other hand, group viii showed no bladder lesions. conclusion: the wsdp is chemopreventive against rat bladder carcinogenesis, if administered 30 days prior to bbn , and that l-lysine causes promotion of bladder carcinogenesis.
Estudo químico e biológico de Tephrosia toxicaria Pers.
Vasconcelos, Jackson Nunes e;Lima, Jefferson Queiroz;Lemos, Telma Leda Gomes de;Oliveira, Maria da Concei??o Ferreira de;Almeida, Maria Mozarina Beserra;Andrade-Neto, Manoel;Mafezoli, Jair;Arriaga, Angela Martha Campos;Santiago, Gilvandete Maria Pinheiro;Braz-Filho, Raimundo;
Química Nova , 2009, DOI: 10.1590/S0100-40422009000200021
Abstract: the ethanol extracts from leaves, stems, pods and roots were assayed against the 3rd instar aedes aegypti larvae and the highest activity was observed in the roots extracts (lc50 47.86 ppm). this extract was submitted to partition with hexane, chloroform, ethyl acetate and methanol. the respective fractions were bioassayed and the best larvicidal activities were identified in the hexane (lc50 23.99 ppm) and chloroform (lc50 13.80 ppm) fractions. antioxidant activity (ddph method) was observed in the ethanol extract (ic50 276 μg/ml) from roots of t. toxicaria. fractions from this extract were also tested and the highest antioxidant activity (ic50 89 μg/ml) was found in the methanol fraction. the flavonoids iso-obovatin (1), obovatin (2), 6a,12a-dehydro-β-toxicarol (3), 6a,12a-dehydro-α-toxicarol (4) and α-toxicarol (5) were isolated and bioassayed against a. aegypti. the flavonoid 5 showed the best larvicidal activity (lc50 24.55 ppm). the antioxidant activity of 2 was investigated and showed ic50 3.370 μg/ml. the antioxidant and larvicidal activities of tephrosia toxicaria are reported for the first time.
Metabólitos secundários de Protium heptaphyllum march
Bandeira, Paulo Nogueira;Pessoa, Otília Deusdênia Loiola;Trevisan, Maria Teresa Salles;Lemos, Telma Leda Gomes;
Química Nova , 2002, DOI: 10.1590/S0100-40422002000700006
Abstract: phytochemical investigation of the resin, fruits, leaves, and trunk of protium heptaphyllum led to the isolation of the monoterpene p-menth-3-ene-1,2,8-triol, a and b amyrin, quercetin, brein, quercetin-3-o-rhamnosyl, (-) catechin and scopoletin. their structures were established by 1d and 2d nmr spectroscopy and comparison with published data.
Metabólitos secundários de Protium heptaphyllum march
Bandeira Paulo Nogueira,Pessoa Otília Deusdênia Loiola,Trevisan Maria Teresa Salles,Lemos Telma Leda Gomes
Química Nova , 2002,
Abstract: Phytochemical investigation of the resin, fruits, leaves, and trunk of Protium heptaphyllum led to the isolation of the monoterpene p-menth-3-ene-1,2,8-triol, alpha and beta amyrin, quercetin, brein, quercetin-3-O-rhamnosyl, (-) catechin and scopoletin. Their structures were established by 1D and 2D NMR spectroscopy and comparison with published data.
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