7 documents found, page 1 of 1
Growth curve, biochemical profile and phytochemical analyses in calli obtained ...
Santos Filho,Plinio Rodrigues dos; Santos,Breno Régis; Barbosa,Sandro; Vieira,Letícia Rios; Freitas,Natália Chagas de; Dias,Daniele FerreiraGarcinia brasiliensis, popularly known as Bacupari, is native to the Amazon and commonly used in folk medicine for its therapeutic properties. This plant is rich in bioactive compounds like benzophenones. However, there are no works about the in vitro establishment and achievement of secondary metabolites in this plant. Thus, the aim of this work was to determine the growth curve and to perform the biochemical ...
Uso de redes neurais recorrentes na determinação das constantes de acidez para ...
Costa,Éderson D' Martin; Lemes,Nelson Henrique Teixeira; Santos,Marcelo Henrique dos; Braga,João PedroThis work propose a recursive neural network to solve inverse equilibrium problem. The acidity constants of 7-epiclusianone in ethanol-water binary mixtures were determined from multiwavelength spectrophotmetric data. A linear relationship between acidity constants and the %w/v of ethanol in the solvent mixture was observed. The proposed method efficiency is compared with the Simplex method, commonly used in no...
Um espalhador de baixo custo de fase estacionária em placas para cromatografia ...
Santos,Marcelo Henrique dos; Mégda,Jozyclécio; Cruz,Priscilla Bento Matos; Martins,Felipe Terra; Moreira,Maria Eliza de CastroChromatography is a means of separating mixtures into their several components. TLC, mainly a liquid/solid process, is one of the separation techniques most often used. It is indispensable in laboratories dealing with natural products, organic and analytical chemistry. Commercial chromatography plates are offered at relatively high cost. In this work the construction of a hand-operated plate coater of stationar...
Influência do processamento e da torrefação sobre a atividade antioxidante do c...
Santos,Marcelo Henrique dos; Batista,Bruno Lemos; Duarte,Stella Maris da Silveira; Abreu,Celeste Maria Patto de; Gouvêa,Cibele Marli Cação PaivaThe aim of this work is to evaluate the influence of processing (semi-dry and dry) and roasting (light, medium and dark) on the antioxidant activity of coffee brews, using tests to determine the reducing power and the DPPH scavenging, Fe+2 chelating and lipid peroxidation inhibition activities. All of the coffee brews presented concentration-dependent antioxidant activity. The light coffee samples presented the...
Variação química do óleo essencial de Hyptis suaveolens (L.) Poit., sob condiçõ...
Martins,Felipe Terra; Santos,Marcelo Henrique dos; Polo,Marcelo; Barbosa,Luiz Cláudio de AlmeidaThis study was performed to establish the correlation between the growth conditions and essential oil composition of Hyptis suaveolens from Alfenas (MG), Brazil. The plants were grown in a greenhouse, four treatments were used and they were harvested at two different periods of time (60 and 135-day-old plants). The essential oil composition was determined by GC-MS analysis. The terpenes spathulenol, globulol, d...
Effect of processing and roasting on the antioxidant activity of coffee brews
Duarte,Stella Maris da Silveira; Abreu,Celeste Maria Patto de; Menezes,Hilary Castle de; Santos,Marcelo Henrique dos; Gouvêa,Cibele Marli Cação PaivaThe aim of this work was to evaluate the effect of processing and roasting on the antioxidant activity of coffee brews. Brews prepared with light, medium and dark roasted coffees were analyzed. The pH, total solids content, polyphenols content, reducing substances and chlorogenic acids content were determined. The antioxidant activity of aqueous extracts, the guaicol decolorizing and the capacity to inhibit lip...
7-Epiclusianona, a nova benzofenona tetraprenilada e outros constituintes quími...
Santos,Marcelo Henrique dos; Nagem,Tanus Jorge; Oliveira,Tânia Toledo de; Braz-Filho,RaimundoPhytochemical investigation of the fruits of Rheedia gardneriana led to the isolation of sesquiterpenes mixture, methyl esters of fatty acids (palmitate, estearate, oleate, linoleate, linolenate), sugars (galactose, glucose, fructose), triterpene (oleanolic acid), steroids mixture (stigmasterol and sitosterol) and the new tetraprenylated benzophenone 7-epiclusianone.