Zobrazeno 1 - 10
of 27
pro vyhledávání: '"Cabral Pavei"'
Autor:
Samuel Kaiser, Simone Gasparin Verza, Renata Cougo Moraes, Pedro Ernesto de Resende, Cabral Pavei, George González Ortega, Fabiano Barreto
Publikováno v:
Química Nova, Vol 36, Iss 6, Pp 808-814 (2013)
Cat's claw oxindole alkaloids are prone to isomerization in aqueous solution. However, studies on their behavior in extraction processes are scarce. This paper addressed the issue by considering five commonly used extraction processes. Unlike dynamic
Externí odkaz:
https://doaj.org/article/3812e229f88743d9a75bf55e77283baa
Autor:
Vanessa Pittol, Simone Gasparin Verza, Samuel Kaiser, Evelyn Maribel Condori Peñaloza, George González Ortega, Cabral Pavei, Renata Cougo Moraes
Publikováno v:
Industrial Crops and Products. 48:153-161
This work focused on extraction optimization by dynamic maceration of the foremost bioactive compounds of cat's claw bark, namely, polyphenols (PPH), pentacyclic (POA) and tetracyclic oxindole alkaloids (TOA), and quinovic acid glycosides (QAG). A th
Autor:
George González Ortega, Maria Paula Garofo Peixoto, Pedro Ernesto de Resende, Janine Treter, Simone Gasparin Verza, Cabral Pavei, Gustavo Luís Borré, Samuel Kaiser
Publikováno v:
Phytochemical Analysis. 23:415-420
Introduction Ilex paraguariensis A. St. Hil. (mate) is known in several South American countries because of the use of its leaves in stimulant herbal beverages. High saponin contents were reported in mate leaves and unripe fruits that possess a dissi
Publikováno v:
Journal of Liquid Chromatography & Related Technologies. 33:1551-1561
A reversed-phase LC method was developed and validated for the separation and assay of the main polyphenols in extracts from barks of Uncaria tomentosa. The LC method consists of a RP-18 column, in gradient mode (trifluoroacetic acid-methanol) using
Publikováno v:
Revista Brasileira de Farmacognosia v.20 n.3 2010
Revista Brasileira de Farmacognosia
Sociedade Brasileira de Farmacognosia (SBFgnosia)
instacron:SBFGNOSIA
Revista Brasileira de Farmacognosia, Volume: 20, Issue: 3, Pages: 300-309, Published: JUL 2010
Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
Revista Brasileira de Farmacognosia, Vol 20, Iss 3, Pp 300-309
Revista Brasileira de Farmacognosia
Sociedade Brasileira de Farmacognosia (SBFgnosia)
instacron:SBFGNOSIA
Revista Brasileira de Farmacognosia, Volume: 20, Issue: 3, Pages: 300-309, Published: JUL 2010
Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
Revista Brasileira de Farmacognosia, Vol 20, Iss 3, Pp 300-309
Entre as diversas atividades biológicas relatadas para as saponinas, merecem destaque aquelas relacionadas ao aumento da resposta imune e a ruptura das membranas dos eritrócitos. No desenvolvimento de vacinas, ambas as propriedades exercem atividad
Autor:
Francilene Amaral da Silva, Gustavo Luís Borré, Samuel Kaiser, George González Ortega, Cabral Pavei, Valquiria Linck Bassani
Publikováno v:
Journal of Liquid Chromatography & Related Technologies. 33:362-374
The contents of the methylxanthines, saponins, and phenolics compounds were determined in different parts of Ilex paraguariensis A. St. Hil., in order to investigate the chemical differences among some well explored plant parts, leaves and branches,
Autor:
Simone Gasparin Verza, Rafael B. Cornelio, Cabral Pavei, Paulo Mayorga, Ana Paula Araújo Cabral da Silva, Alisson B. Luzia, Sílvia Ligório Fialho, George González Ortega
Publikováno v:
Journal of Liquid Chromatography & Related Technologies. 32:2857-2865
A fast and sensitive high performance chromatographic method for quantification of sodium alendronate was developed and afterward implemented for tablet content and dissolution test. Sodium alendronate reference standard and samples of two different
Publikováno v:
Journal of the Brazilian Chemical Society, Volume: 19, Issue: 8, Pages: 1627-1633, Published: 2008
Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
Journal of the Brazilian Chemical Society v.19 n.8 2008
Journal of the Brazilian Chemical Society
Sociedade Brasileira de Química (SBQ)
instacron:SBQ
Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
Journal of the Brazilian Chemical Society v.19 n.8 2008
Journal of the Brazilian Chemical Society
Sociedade Brasileira de Química (SBQ)
instacron:SBQ
Cross-povidone, or polyvinylpyrrolidone (PVPP) affords an analytical alternative instead of hide-powder and casein as binding agent in the content assay of vegetable tannins. In this work we studied the specificity of PVPP to bind polyphenolics in th
Autor:
George González Ortega, Danielle Guimarães Almeida Diniz, Francilene Amaral da Silva, Cabral Pavei, José Cláudio Fonseca Moreira, Eliana Martins Lima, Valquiria Linck Bassani
Publikováno v:
Journal of Liquid Chromatography & Related Technologies. 30:3119-3131
A liquid chromatography (LC) method was developed and validated for identification and quantification of polyphenols in aqueous extractive solution from Ilex paraguariensis (erva‐mate), in agreement with the ICH requirements for analytical methods.
Publikováno v:
Journal of Liquid Chromatography & Related Technologies. 30:87-95
Two improved HPLC methods for the characterization and assay of the saponin content in green fruits of Ilex paraguariensis (erva‐mate) are described. Both HPLC methods consisted of isocratic separation at room temperature, using a RP‐18 column wi