20 documents found, page 1 of 2
Valorization of Hesperidin from Citrus Residues: Evaluation of Microwave-Assist...
Silva,Danielle F. da; Bomfim,João P. A.; Marchi,Rafael C.; Amaral,Jéssica C.; Pinto,Luciano S.; Carlos,Rose M.; Ferreira,Antonio G.; Forim,Moacir R.The aim of the current study was the valorization of hesperidin, the dominant flavonoid in citrus processing waste, by microwave-assisted synthesis of hesperidin-Mg complex, improving its antioxidant activity and insecticidal potential. Here we show, for the first time, that microwave-assisted synthesis of [Mg(hesp)2(phen)]OAc (1) (hesp: hesperidin, phen: phenanthroline) improve the reaction rate and yield. The...
Evaluation of the Seasonality and Extraction Method on the Polar Extracts of Cr...
Prado,Vilma M. J.; Jesus,Raphael A. de; Oliveira,Julio M. A.; Pereira,Camila S. A.; Blank,Arie F.; Pereira-Filho,Edenir R.; Cass,Quezia B.Croton grewioides Baill. popularly known as “canelinha” or “canelinha-de-cheiro” has been used for the treatment of influenza, antitussive, febrifuge and headache; however, the study of its phytochemical composition is limited. The aim of this study was to investigate the effect of the extraction method and seasonality through leaf extracts of four accessions of Croton grewioides by fingerprint chromatograms ai...
Clathriamide, an hexapeptide isolated from the marine sponge Clathria (Clathria...
Freire,Vítor F.; Slivinski,Juliano; Quintana-Bulla,Jairo I.; Moraes,Fernando C.; Paradas,Wladimir C.; Salgado,Leonardo T.; Pereira,Renato C.ABSTRACT Chemical investigation of the aqueous fraction of the ethanol extract from the Brazilian endemic marine sponge Clathria (Clathria) nicoleae Vieira de Barros, Santos & Pinheiro, 2013, Microcionidae, sampled from a 55 m deep rhodolith bed at the Amazon River mouth, led to the isolation of a new hexapeptide, clathriamide (1). HP-20 resin was used to capture compound 1 from the aqueous fraction, which was ...
The potential of compounds isolated from Xylaria spp. as antifungal agents agai...
Elias,Luciana M.; Fortkamp,Diana; Sartori,Sérgio B.; Ferreira,Marília C.; Gomes,Luiz H.; Azevedo,João L.; Montoya,Quimi V.; Rodrigues,AndréABSTRACT Anthracnose is a crop disease usually caused by fungi in the genus Colletotrichum or Gloeosporium. These are considered one of the main pathogens, causing significant economic losses, such as in peppers and guarana. The current forms of control include the use of resistant cultivars, sanitary pruning and fungicides. However, even with the use of some methods of controlling these cultures, the crops are...
Phragmalin Limonoids from Swietenia macrophylla and Their Antifeedant Assay aga...
Pamplona,Sônia G. S. R.; Arruda,Mara S. P.; Castro,Kelly C. F.; Silva,Consuelo Y. Y. e; Ferreira,Antonio G.; Silva,Maria F. G. F. da; Ohashi,Orlando S.The purification of the hexanic extract from the leaves of a native variety of mahogany collected in Santarém (Pará, Brazil) afforded eight new phragmalin limonoids along with eight known compounds. This variety, according to field observations, should be considered resistant against the specialist insect Hypsipyla grandella, that attacks the terminal shoots only of juvenile mahogany and not of matured ones. Af...
Evaluation of Chemical Defense and Chemical Diversity in the Exotic Bryozoan Am...
Santos,Larissa A. H. dos; Clavico,Etiene E. G.; Parra,Lizbeth L. L.; Berlinck,Roberto G. S.; Ferreira,Antonio G.; Paul,Valerie J.; Pereira,Renato C.The present investigation tests the effects against feeding by fishes of crude extracts obtained from eleven distinct populations of the bryozoan Amathia verticillata, an invasive species found globally in tropical to warm-temperate waters. Investigation of extracts from 11 populations of A. verticillata led to the identification and quantification of the known indole alkaloid 2,5,6-tribromo-N-methylgramine and...
1H qNMR and Chemometric Analyses of Urban Wastewater
Alves Filho,Elenilson G.; Sartori,Luci; Silva,Lorena M. A.; Venâncio,Tiago; Carneiro,Renato L.; Ferreira,Antonio G.The industrial development, urbanization and agriculture play a major role in the degradation of the global environmental. Thus, the wastewater treatments need to be monitored continuously to ensure efficient operation. This manuscript presents an application of 1H nuclear magnetic resonance (NMR) associated with chemometric and quantitative analyses to study the wastewater before and after the sewage treatment...
Rodriguesic acids, modified diketopiperazines from the gastropod mollusc Pleuro...
Pereira,Fabio R.; Santos,Mario F. C.; Williams,David E.; Andersen,Raymond J.; Padula,Vinicius; Ferreira,Antonio G.; Berlinck,Roberto G. S.In the present investigation, two specimens of the nudipleuran mollusc Pleurobranchus areolatus have shown to accumulate oxidized rodriguesin A derivatives. Rodriguesic acid presents a carboxylic acid replacing the terminal methyl group of the alkyl chain of rodriguesin A. A hydroxamate group was also present on the diketopiperazine moiety of a rodriguesic acid derivative. The structures of both rodriguesic aci...
Production of 5-hydroxy-7-methoxy-4-methylphthalide in a culture of Penicillium...
Valente,Angela M.M.P.; Ferreira,Antonio G.; Daolio,Cristina; Rodrigues Filho,Edson; Boffo,Elisangela F.; Souza,Antonia Q.L.; Sebastianes,Fernanda L.S.The chemical reactions carried out by microorganisms have been used as a tool in modern chemistry. This paper reports the production of mycophenolic acid and a new phthalide by the endophytic fungus Penicillium crustosum obtained from coffee seeds. The fungus was cultivated in a liquid medium for a period of seven days and after that the culture medium was divided into four treatments: A, B, C and D, to which d...
Optimization and practical implementation of ultrafast 2D NMR experiments
Queiroz Júnior,Luiz H. K.; Ferreira,Antonio G.; Giraudeau,PatrickUltrafast 2D NMR is a powerful methodology that allows recording of a 2D NMR spectrum in a fraction of second. However, due to the numerous non-conventional parameters involved in this methodology its implementation is no trivial task. Here, an optimized experimental protocol is carefully described to ensure efficient implementation of ultrafast NMR. The ultrafast spectra resulting from this implementation are ...