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| BATISTA,Marisa Cristina Aranha; ABREU,Bruno Vinicius de Barros; DUTRA,Richard Pereira; CUNHA,Mayara Soares; AMARAL,Flavia Maria Mendonça do; TORRES,Luce Maria Brandão; RIBEIRO,Maria Nilce de Sousa. |
| ABSTRACT Geopropolis, a mixture of plant resin, wax, soil and salivary secretion, is produced by the stingless bee Melipona fasciculata. This aim of this study was to investigate the chemical composition and antioxidant activity of geopropolis collected from beehives in two phytogeographical regions, flooded fields and cerrado, in the municipalities of Palmeirândia and Fernando Falcão, Maranhão State, northeastern Brazil. The geopropolis compounds were identified by gas chromatography-mass spectrometry (GC/MS). Additionally, total phenolic content was determined with the Folin−Ciocalteu reagent and antioxidant activity was evaluated in vitro by 2,2-diphenyl-1-picrylhydrazyl (DPPH) and ferric reducing antioxidant power (FRAP) assays. The four geopropolis... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Stingless bee; Polyphenols; Triterpenes; Phytogeographical regions. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672016000300315 |
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| Branco,Alexsandro; Pinto,Angelo C.; Braz Filho,Raimundo. |
| From the hexane and ethyl acetate extracts obtained from stems, roots and leaf sheaths of Vellozia graminifolia, a mixture of linear hydrocarbons, a mixture of pentacyclic triterpenes, five monoisoprenylated flavonoids and one labdane diterpene, (-)-ent-3beta-hydroxy-8(17)-labden-15-oic acid, were isolated. The linear hydrocarbons and minor triterpenes were identified in their corresponding mixtures by High Resolution Gas Chromatography (HRGC) and HRGC coupled to mass spectrometry. The major pentacyclic triterpenes and the diterpene were characterized by spectral data, including 2D NMR experiments, and chemical transformations. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vellozia graminifolia; Velloziaceae; Triterpenes; Diterpene; Flavonoids. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000300005 |
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| SIMÕES,LEANDRO R.; MACIEL,GLAUBER M.; BRANDÃO,GERALDO C.; FILHO,JOSÉ D.S.; OLIVEIRA,ALAÍDE B.; CASTILHO,RACHEL O.. |
| Pectolinarin, a flavone heteroside, was isolated from Distictella elongata (Vahl) Urb. leaves ethanol extract, along with a mixture of ursolic, pomolic and oleanolic acids, besides β-sitosterol. Their structures were established on the basis of spectral analysis (1H and 13C NMR, 1D and 2D) and they were compared with literature. This is the first report on the occurrence of this flavonoid in a species of the Bignoniaceae family. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bignoniaceae; Distictella elongata; Pectolinarin; Triterpenes. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000300873 |
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| Reyes Osornio, Maribel. |
| Se comparó en invernadero el efecto de la miel (M), ácido acetilsalicílico (ASA), aminoácidos (AA) y Bacillus subtilis (BS) en la severidad del Cucumber mosaic virus (CMV), absorbancia, producción de biomasa fresca (PBF), contenido total de terpenoides y de nutrimentos en calabacita variedad Grey Zucchini (GZ). El tratamiento AA presentó estadísticamente la severidad más alta, así como la mayor absorbancia; los tratamientos M, BS y ASA presentaron 12 terpenoides, AA 11 y los testigos 10. El mayor contenido de Fe, Zn y Mn lo tuvieron los tratamientos M, BS y ASA. Por otro lado, se evaluaron dos extractos totales de terpenoides (Tr), obtenidos de plantas de calabacita GZ inoculadas (PI) con CMV y de plantas no inoculadas (PNI), para evaluar la severidad,... |
| Tipo: Tesis |
Palavras-chave: Severidad de virosis; Concentración viral; Triterpenos; Análisis nutrimental; Maestría; Fitopatología; Virus severity; Viral concentration; Triterpenes; Nutrimental analysis. |
| Ano: 2008 |
URL: http://hdl.handle.net/10521/1597 |
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| Pungitore,Carlos R.; García,Matías; Gianello,José C.; Tonn,Carlos E.; Sosa,Marta E.. |
| Duration of the pupal stage, toxic activity and nutritional indices induced by oleanolic acid (I), maslinic acid (II), and daucosterol (III) isolated from the native plant Junellia aspera and chemical derivatives, were determinated on larvae, and adults of Tribolium castaneum (Herbst). The current study shows that these triterpenes acts as acute toxic compounds when were applied topically and/or incorporated into the food of the red flour beetle. Nevertheless, no activity related with the nutritional status of this insect was produced. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Triterpenes; Toxic effect; Tribolium castaneum; Junellia aspera. |
| Ano: 2005 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0373-56802005000100010 |
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| Silva,Isabel Cristina Vieira da; Oliveira,Pollyana Felix de; Barbosa,Gleyce Moreno; Wessjohann,Ludger A.; Cardozo-Filho,Lucio; Holandino,Carla; Muzitano,Michelle Frazão; Leal,Ivana Correa Ramos. |
| Cancer is one of the most prevalent diseases worldwide and the natural products could be a source of bioactive compounds. Passiflora mucronata (PM) belongs to a very known vegetal genus, although, there are no studies about cytotoxic activity or isolated compounds. Different extracts from PM were obtained by liquid-liquid partition (P), Soxhlet (Sox) and supercritical fluid (SFE1-5) extraction techniques, being compared concerning their yields, chemical profile and cytotoxicity. The Sox extracts showed the highest yields (6.03%: hexane; 2.51%: dichloromethane) followed by SFE (from 4.34 to 1.63%) and partitions (1.06 and 2.26%). The hexane partition (HP) showed the best cytotoxic activity against K562 cell line (IC50 = 18.72 µg.mL-1). From HP, the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Apoptosis; Cytotoxic; Passiflora mucronata; Stigmasterol; Triterpenes. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502020000100510 |
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| Abreu,Viviane Gomes da Costa; Corrêa,Geone Maia; Lagos,Izandina Aparecida dos Santos; Silva,Roqueline Rodrigues; Alcântara,Antônio F. de C.. |
| The ethanol extract from stem bark of Sacoglottis uchi Huber (popularly known as uchi in the Amazon Region) was submitted to chromatographic fractionation. The dichloromethane fractions provided the pentacyclic triterpene 3-oxo-friedelin (1). The dichloromethane:methanol fractions provided the pentacyclic triterpenes pseudotaraxasterol (2), lupeol (3), a-amyrin (4), betulin (5), and methyl 2ß,3ß-dihydroxy-urs-12-en-28-oate (6) and a mixture of the steroids sitosterol (7) and stigmasterol (8). Their chemical structures were determined by NMR spectroscopy and comparison with spectroscopic data from the literature. All compounds are described for the first time in this species. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Humiriaceae; Medicinal plants; Amazon Region; Triterpenes. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672013000400015 |
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| Guerra,Fernando; Sepúlveda,Sebastián. |
| ABSTRACT: Quillaja genus (Quillajaceae family) is endemic to South America, where is represented by two species, Quillaja saponaria and Quillaja brasiliensis. One outstanding characteristic of these forest tree species is their production of saponins, a family of amphipathic glycosides, involved in the defensive response of plants against biotic and abiotic factors. Saponins are metabolites of economic importance due to their chemical and physical properties. Basic and applied research efforts performed during the last decades, mainly on Q. saponaria, have placed these compounds as an important raw material in industrial areas, such as food and beverage, cosmetics, vaccine production, biopesticides, among others. In this review, we summarize information on... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Triterpenes; Secondary metabolism; Chemical structure; Biosynthesis pathway; Genes. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000501802 |
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