9 documents found, page 1 of 1
SYNTHESIS, THERMAL STUDIES AND CONVERSION DEGREE OF DIMETHACRYLATE POLYMERS USI...
Alarcon,Rafael Turra; Holanda,Bruno Barreto da Cunha; Rinaldo,Daniel; Caires,Flávio Junior; Almeida,Marcos Vinícius de; Bannach,GilbertThe aim of this paper is to replace toxic coinitiators (tertiary amines) by non-toxic compounds such as glycerol and inositol (polyalcohol) in dimethacrylate resins. For this purpose, mid infrared spectroscopy (MIR) was used to calculate the monomers' degree of conversion (%DC); as well as simultaneous Thermogravimetric Analysis – Differential Thermal Analysis (TGA-DTA) and Differential Scanning Calorimetry (DS...
Operculina macrocarpa: chemical and intestinal motility effect in mice
Paganotte,Daniele Michelin; Sannomiya,Miriam; Rinaldo,Daniel; Vilegas,Wagner; Salgado,Hérida R.N.ABSTRACT Operculina macrocarpa (L.) Urb., Convolvulaceae, is used by the population as a laxative. In this work we described the isolation of the three phenolic acids present in the hydroethanolic extract of the O. macrocarpa roots. The quantification of the caffeic, chlorogenic acids and of the new caffeic dimer in the hydroethanolic and infusion extracts was performed by high-performance liquid chromatography...
Investigation on the effects of guava (Psidium guajava L.) infusions on germina...
Luber,Jaquelini; Palmieri,Marcel J.; Botelho,Carolina M.; Rinaldo,Daniel; Andrade-Vieira,Larissa F.Guava (Psidium guajava L.) is a plant often employed in popular medicine. Recently several studies have alerted about the toxicity of substances present in medicinal plants, which can pose risks to the human health. In this sense, the present work aimed to investigate the phytotoxic, cytotoxic and genotoxic action of three guava varieties - Paluma, Pedro Sato and Roxa ("purple") - on the plant test system Lactu...
HPLC-DAD based method for the quantification of flavonoids in the hydroethanoli...
Amorim,Marcelo R. de; Rinaldo,Daniel; Amaral,Fabiano P. do; Vilegas,Wagner; Magenta,Mara A. G.; Vieira Jr,Gerardo M.; Santos,Lourdes C. dosThis article describes the isolation and identification of flavonoids in the hydroethanolic extract of the aerial parts from Tonina fluviatilis and evaluation of their antiradical activity. A method based on HPLC-DAD was developed and validated for detecting and quantifying flavonoids in hydroethanolic extracts. The flavonoids identified and quantified in the extract were 6,7-dimethoxyquercetin-3-O-β-D-glucopyr...
Determinação de corantes marcadores do tipo azo e antraquinona em combustíveis ...
Trindade,Magno Aparecido Gonçalves; Rinaldo,Daniel; Vilegas,Wagner; Zanoni,Maria Valnice BoldrinAn analytical method based on high-performance liquid chromatography with electrochemical detection has been developed and applied to the determination of Solvent blue 14 (SA-14) and Solvent red 24 (SV-24) in fuel samples. The dyes were better separated on C18 column, using a mobile phase composed of acetonitrile and ammonium acetate (90:10, v/v). Detection was carried out at an oxidation potential of +0.85V. T...
Constituintes químicos e atividade antioxidante de extratos das folhas de Termi...
Ayres,Mariane Cruz Costa; Chaves,Mariana H.; Rinaldo,Daniel; Vilegas,Wagner; Vieira Júnior,Gerardo MagelaPhytochemical investigation of ethanolic leaves extracts of T. fagifolia led to the isolation of (+)-catechin, sitosterol-3-O-β-D-glucopyranoside, α- and β-tocopherol, a mixture of lupeol, α- and β-amyrin, sitosterol and a mixture of glicosid flavonoids (CP-13). The structures of these compounds were identified by ¹H and 13C NMR spectral analysis and comparison with literature data. Absolute configuration of th...
Antimicrobial activity of Byrsonima species (Malpighiaceae)
Michelin,Daniele C.; Sannomiya,Miriam; Figueiredo,Maria E.; Rinaldo,Daniel; Santos,Lourdes C. dos; Souza-Brito,Alba R. M.; Vilegas,WagnerByrsonima species, family Malpighiaceae, is popularly known as "murici". There are several properties attributed to the leaves of Byrsonima species including febrifuge, to treat gastrointestinal dysfunctions and skin diseases. In this work, the antimicrobial activity of Byrsonima fagifolia, B. basiloba and B. intermedia extracts obtained from the leaves were evaluated by using the disc-diffusion method. The res...
New flavone from the leaves of Neea theifera (Nyctaginaceae)
Rinaldo,Daniel; Rodrigues,Clenilson M.; Rodrigues,Juliana; Sannomiya,Miriam; Santos,Lourdes C. dos; Vilegas,WagnerNeea theifera Oerst. (Nyctaginaceae) is widely used in Brazilian folk medicine for the treatment of gastric ulcers and inflammation. Phytochemical investigation of the leaves of Neea theifera afforded the isolation of the new flavone luteolin-7-O-[2''-O-(5'''-O-feruloyl)- beta-D-apiofuranosyl]-b-D-glucopyranoside (1) besides the eight-known compounds vitexin, isovitexin, isoorientin, orientin, vicenin-2, chryso...
Preparative separation of flavonoids from the medicinal plant Davilla elliptica...
Rinaldo,Daniel; Silva,Marcelo Aparecido; Rodrigues,Clenilson Martins; Calvo,Tamara Regina; Sannomiya,Miriam; Santos,Lourdes Campaner dos; Vilegas,WagnerHigh-speed counter-current chromatography (HSCCC) is a major tool for the fast separation of natural products from plants. It was used for the preparative isolation of the flavonoid monoglucosides present in the aerial parts of the Davilla elliptica St. Hill. (Dilleniaceae). This species is used in Brazilian folk medicine for the treatment of gastric disorders. The optimum solvent system used was composed of a ...