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| Registros recuperados: 17 | |
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| Romero-Noguera,Julio; López-Miras,María del Mar; Martín-Sánchez,Inés; Ramos-López,José Miguel; Bolívar-Galiano,Fernando. |
| Mastic, one of the best natural varnishes, is frequently used as protective and finishing layer or as component of oleo-resinous media in paintings, both in the past and currently. However, this resin is affected by complex deterioration processes which can change its characteristics and thus the visual aspect of works of art. The alteration processes caused by radiation have been widely studied, but there is a lack of information on the biodeterioration of this natural product. In this paper, fungi from collections as well as from oil paintings of the Fine Arts Museum of Granada (Spain) were inoculated onto slides covered with mastic. The samples, after an incubation period of 15 days, were analysed by gas chromatography-mass spectrometry (GC-MS) to... |
| Tipo: Journal article |
Palavras-chave: Biodeterioration; Fungi; GC-MS; Mastic. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000600001 |
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| Martinelli,Laira; Rosa,Jessica Miranda; Ferreira,Carolina dos Santos Bragine; Nascimento,Gustavo Marcelo da Luz; Freitas,Mateus Silveira; Pizato,Luiz Carlos; Santos,Wanderson de Oliveira; Pires,Ricardo Francisco; Okura,Mônica Hitomi; Malpass,Geoffroy Roger Pointer; Granato,Ana Claudia. |
| ABSTRACT: Essential oils are the most important compounds produced during secondary metabolism in aromatic plants. Essential oils are volatile, have characteristic odor and are used as defensive agents by plants. In pepper, it is possible to say that essential oils are the “flavor fingerprint” of each species. In the present article, eight species of pepper were studied in order to extract their essential oils and oleoresins, test their antibacterial and antifungal activities and also to identify the compounds present in the most bioactive samples. Results demonstrated that two essential oils [Pimenta dioica (L.) Merr. and Schinus terebinthifolius] and three oleoresins (Schinus terebinthifolius and Piper nigrum white and black) recorded significant... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Peppers; Essential oil; Oleoresins; Antimicrobial activity; GC-MS. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000500451 |
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| Romero-Noguera,Julio; Martín-Sánchez,Inés; López-Miras,María del Mar; Ramos-López,José Miguel; Bolívar-Galiano,Fernando. |
| Since the middle of the XIX century, when dammar became popular in Occident, this natural resin is one of the most used in art painting techniques as final protective coating (varnish) as well as a component of pictorial media. The present work is the first approach to the study of the microbiological biodeterioration of this artistic material, which can seriously affect the appearance and integrity of works of art when bad conservation conditions -especially high humidity levels- take place. 12 microorganisms, fungi and bacteria, came from collection and from oil paintings affected by biodeterioration patterns, were inoculated on test specimens prepared with varnish dammar. These were incubated and analyzed by GC-MS to determine both the microbiological... |
| Tipo: Journal article |
Palavras-chave: Bacteria; Biodeterioration; Dammar; Fungi; GC-MS. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000300006 |
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| KARIM,M.; JABEEN,K.; IQBAL,S.; JAVAID,A.. |
| ABSTRACT Mango (Mangifera indica) is one of the most important trees grown mainly in the tropical and subtropical countries. Anthracnose disease caused by Colletotrichum gloeosporioides, is the most damaging disease causing reduction of flower set and yield losses in mango. The present study was designed to evaluate antifungal activity of Datura metel extracts against C. gloeosporioides. Extracts (1% to 3%) of different parts of D. metel viz. leaves, seeds and roots were assessed for their antifungal potential. Methanolic seed extract of D. metel depicted the highest antifungal potential against the test fungus. All the applied concentrations effectively reduced growth of the test fungus. However, 1.5% conc. of methanolic seeds extract showed maximum... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antifungal; GC-MS; Methanolic extracts; Phytochemical analysis. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100244 |
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| Cole,E.R.; Santos,R.B. dos; Lacerda Júnior,V.; Martins,J.D.L.; Greco,S.J.; Cunha Neto,A.. |
| The essential oil (EO) composition of ripe fruit of S. terebinthifolius Raddi was analyzed by GC-MS. The oil extraction yielded 6.54 ± 1.06% (w/w). Seventeen compounds were identified, accounting for 91.15% of the total oil, where monoterpenes constituted the main chemical class (85.81%), followed by sesquiterpenes (5.34%). The major monoterpene identified was δ-3-carene (30.37%), followed by limonene (17.44%), α-phellandrene (12.60%) and α-pinene (12.59%). Trans-caryophyllene (1.77%) was the major sesquiterpene identified. The antibacterial activity of the essential oil was evaluated against wild strains of hospital origin (Escherichia coli, Pseudomonas sp., Klebsiella oxytoca, Corynebacterium sp., Staphylococcus aureus, Enterobacter sp., Enterobacter... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Essential oil; Schinus terebinthifolius Raddi; GC-MS; Antibacterial activity. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822014000300009 |
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| Zhu,XJ; Hu,YF; Chen,X; Wang,YH; Fang,WP; Li,XH. |
| El propósito de este estudio fue evaluar la actividad antagonista de dos cepas de hongos endofíticos, Pseudocercospora kaki y Penicillium sclerotiorum, aislados de las hojas de Camellia sinensis, en relación al patógeno del tizón del arroz Magnaporthe grisea. La actividad inhibitoria de las dos cepas endófitas sobre M. grisea en cultivo dual se comparó con aquella en monocultivo. Se confirmó que el caldo y su extracto de etil acetato del cultivo dual tuvieron una actividad mucho más inhibitoria sobre M. grisea que los monocultivos de P. kaki y P. sclerotiorum. Los índices antagonistas del caldo y extracto de etil acetato del cultivo dual sobre el crecimiento del micelio de M. grisea fueron 78,02% ± 2,19% y 62,81% ± 2,29%, respectivamente, en diferentes... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Camellia sinensis; Hongos endofíticos; Cultivo dual; Actividad antimicrobiana; GC-MS. |
| Ano: 2014 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572014000100008 |
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| Akbar,Muhammad; N. Sherazi,Iram; Khalil,Tayyaba; S. Iqbal,Muhammad; Akhtar,Shamim; N. Khan,Salik. |
| Abstract Background: Antifungal activity of slender amaranth (Amaranthus viridis L.) is well documented but such studies are scarce in Pakistan, especially against plant pathogens. It was hypothesized that A. viridis has antifungal activity against fungal phyto-pathogens also. Objective: Identification of antifungal constituents from leaf extracts of A. viridis. Methods: Different organic solvent extracts of A. viridis leaves were evaluated against 5 plant pathogenic fungal species viz. Alternaria alternata, Aspergillus flavus, Drechslera australiensis, Fusarium oxysporum and Macrophomina phaseolina. Antifungal activity of A. viridis was determined by serial dilution method. Six levels (0, 5, 10, 15, 20 and 25 mg mL-1) of treatments of each n-hexane,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amaranthus viridis; Antifungal; GC-MS; Plant pathogenic; Slender amaranth. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100313 |
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| BASHIR,S.; JABEEN,K.; IQBAL,S.; JAVED,S.; NAEEM,A.. |
| ABSTRACT: In the current study phytochemical analysis and in vitro antifungal potential of fruits, leaves and stem of Lantana camara L. were studied. The phytochemical analysis indicated the presence of alkaloids, flavonoids, tannins, saponins, glycosides and terpenoids in fruit, stem and leaves of L. camara. The in vitro antifungal activity of fruit, stem and leaves of L. camara was tested against Colletotrichum gloeosporioides Penz. Different concentrations (1-5%) of methanolic extract of all the selected parts of L. camara were applied in vitro against the test fungus. The results of in vitro experiment revealed that higher concentration of methanolic fruit extract (5%) significantly reduced the biomass C. gloeosporioides up to 66%. This effective... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anthracnose; Bioactivity; Colletotrichum gleosporioides; GC-MS; Phytochemicals. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100167 |
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| SHERAZI,A.Z.; JABEEN,K.; IQBAL,S.; YOUSAF,Z.. |
| ABSTRACT Chenopodium album, leaves were selected to evaluate their antifungal potential against Ascochyta rabiei causative agent for chickpea blight. Different concentrations of methanolic extract of C. album leaves i.e. 1%, 2.5%, 4%, 5.5% and 7% were tested against the target fungus A. rabiei. Maximum reduction in the test fungal biomass (68%) was observed in 7% concentration. This methanolic leaf extract was partitioned and n-butanol, chloroform, n-hexane, ethyl acetate fractions were isolated according to their polarity. In vitro antifungal activity of these fractions was studied by serial dilution method. n-hexane fraction exhibited the highest antifungal potential with 55% inhibition in test fungal biomass, so this fraction was selected for Gas... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antifungal potential; Bathu; GC-MS; Methanolic extract. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000400675 |
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| Cruz-Bolivar,Jennifer Tatiana; Rodríguez-Pérez,Wilson; Suárez-Salazar,Juan Carlos; Ordoñez-Espinosa,Claudia Mercedes; Vega-Cano,Gustavo Adolfo. |
| Abstract The composition of minority compounds in samples of roasted and ground coffee (Coffea arabica var. caturra) cultivated in three altitudinal ranges 1300-1400, 1400-1600, 1600-1800 m. a. s. l., in the Huila department of Colombia were determined. The samples were collected in July of 2012. pH, total acidity and total lipids were measured. Subsequently, the composition of total lipids after esterification and gas chromatography analysis coupled to high resolution mass spectrometry (GC-MS) was established. Quality cup test considering the following attributes: fragrance/aroma, taste, residual flavor, acidity, body, uniformity, balance, clean cup, sweetness, quality and note, were performed. No statistically significant difference (p <0.05) in pH,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Attributes; GC-MS; PH; Quality cup test; Total acidity; Total lipids. |
| Ano: 2017 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000200221 |
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| Santos,Lourdes Campaner dos; Dokkedal,Anne L.; Sannomiya,Miriam; Soares,Maria Carla Piza; Vilegas,Wagner. |
| This work presents the study of nonpolar compounds from plants belonging to the genus Paepalanthus Mart. (Eriocaulaceae). Long-chain linear aliphatic hydrocarbons were identified by GC-FID and GC-MS. The results indicate that Paepalanthus subg. Platycaulon species present a very homogenous profile, with carbon chains of n-alkanes ranging from C25 to C31, most samples presenting higher frequencies of C27 and C29 homologues. Paepalanthus subg. Paepalocephalus species may be distinguished from one another by the distribution of main n-alkanes. P. macrocephalus, subsect. Aphorocaulon species, presents alkanes with odd-carbon numbers and P. denudatus and P. polyanthus, Actinocephalus species, present alkanes with quite distinctive profiles, with many shorter... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Paepalanthus; N-alkanes; GC-FID; GC-MS; Chemotaxonomy. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062005000400007 |
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| Bogo,Amauri; Mantle,Peter. |
| Analysis of the honeydew from an as yet undescribed, though distinctive, Brazilian Stigmacoccus sp. (near S. asper Hempel) by paper chromatography, Fast atom bombardment (FAB-MS) and Gas chromatography-mass spectrometry (GC-MS) identified fructose and glucose as monosaccharides and sucrose, maltose, trehalulose, trehalose and a hexose-hexitol as disaccharides. Erlose and glucosyl erlose have been identified as the tri- and tetra-saccharides in Stigmacoccus sp. and characterised for the first time in scale insects by modern techniques of linkage analysis. The same erlose oligosaccharides were recognised in honeydew of the common scale insect Coccus hesperidum L., together with the pentamer of this series, maltosyl erlose, therefore recognising that specific... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Insecta; FAB-MS; GC-MS; Erlose; Maltose; Metabolic transformation. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0301-80592000000300022 |
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| Xiao,Jian Bo; Chen,Jing Wen; Xu,Ming. |
| The essential oil of Marchantia convoluta was obtained by supercritical (carbon dioxide) extraction using methanol as a modifier. Global yields were determined according to the orthogonal design. The effects of different parameters, such as pressure, temperature, modifier volume and extraction time, on the supercritical fluid extraction (SFE) of essential oil from M. convoluta were investigated. Maximum global yields were obtained using the following conditions: extraction temperature, 35ºC; dynamic time, 35 min; pressure, 15 Mpa and modifier volume, 40 mL. The essential oil extract was analyzed by capillary gas chromatography with mass spectrometric detector (GC-MS). The compounds were identified according to their retention indices and mass spectra (EI,... |
| Tipo: Journal article |
Palavras-chave: GC-MS; Supercritical fluid extraction; Yields. |
| Ano: 2007 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000100013 |
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| Vieira,Ivo J.C.; Medeiros,Walter L.B.; Monnerat,Cecilia S.; Souza,Jucimar J.; Mathias,Leda; Braz-Filho,Raimundo; Pinto,Angelo C.; Sousa,Priscila M.; Rezende,Claudia M.; Epifanio,Rosângela De A.. |
| The pharmacotherapyfor Alzheimer's disease (AD) includes the use of acetylcholinesterase inhibitors (AChEI). Recent investigations for novel AD therapeutic agents from plants suggested that Tabernaemontana genus is a promising source of novel anticholinesterasic indole alkaloids. In this work two fast screening techniques were combined in order to easily identify novel cholinesterase inhibitors (ChEI). Gas chromatography-mass spectrometry (GC-MS) of the less polar alkaloidic fractions obtained from the acid-base extraction of the stalk of T. laeta revealed thirteen monoindole alkaloids, four of them confirmed by co-injection with previously isolated alkaloids. The others were tentatively identified by mass fragmentation analysis. By gas chromatography with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tabernaemontana; Indole alkaloids; Cholinesterase inhibitor; Thin-layer chromatography assay; Ellman´s method; GC-MS. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300003 |
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| Menotti,Vinicius Stela; Scanferla,Deborah Thais Palma; Oliveira,Kleber Ota de; Fratucci,Gabriela Felber; Alves,Gessé de Souza; Bando,Erika; Nerilo,Samuel Botião; Oliveira,Magda Lúcia Félix de; Machinski Junior,Miguel; Mossini,Simone Aparecida Galerani. |
| Abstract The present study describes a method for simultaneous analysis of cocaine, benzoylecgonine and cocaethylene in urine samples. After solid phase extraction, Gas Chromatography-Mass Spectrometry was used for identification and quantification. The calibration curves were linear at 20 - 3000 ng/mL, r2 0.9997 for benzoylecgonine, 15 - 2000 ng/mL, r2 0.9985 and r2 0.9993 for cocaine and cocaethylene, respectively. Accuracy values: cocaine: 93,5 - 102,1%; benzoylecgonine: 97,5 - 104,8%; cocaethylene: 90,6 - 101,5%. Precision values: cocaine: C.V 5,4 - 14,6%; benzoylecgonine: C.V 7,8 - 12,3%; cocaethylene: C.V 5,9 - 12,3%. Detection and quantification limit values: cocaine and cocaethylene:10 ng/mL and 15 ng/mL, respectivalty; benzoylecgonine:15 ng/mL and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Analytical validation; GC-MS; Cocaine; Human urine. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502020000100627 |
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| Menezes,Joyce Castro de; Borges,Gabriela Borba Vilela; Gomes,Fátima de Cássia Oliveira; Vieira,Mariana de Lourdes Almeida; Marques,Andréa Rodrigues; Machado,Ana Maria de Resende. |
| ABSTRACT: The interest in the use of green tea (Camellia sinensis) (L.) Kuntze (Theaceae) products have increased in the last few years due to its medicinal properties. In the present study, we proposed that headspace solid phase microextraction, in combination with gas chromatography coupled to mass spectrometric could be an efficient method to assess the volatile compounds and to ensure the quality control of C. sinensis. We have also compared the anatomical leaf of different commercial green tea samples, analyzed the information in their labels and determined the presence of foreign materials, moisture content, total ashes and microorganisms. Among the 30 analyzed samples, six were identified as C. sinensis according to the anatomical study; 83.4% were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Green tea; GC-MS; SPME; Quality control. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000300751 |
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| Registros recuperados: 17 | |
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