[PDF] Top 20 Quím. Nova vol.32 número5

... Há que se estabelecer, portanto, uma comparação entre dois cenários: uma reunião no eixo RJ-SP-MG versus uma reunião itinerante, tendo como elemento de análise o número de asso[r] ... See full document

... Therefore, this dissolution test condition using phosphate buffer pH 7.5 was selected because it allows maximum discriminating power and the drug release profile obtained in th[r] ... See full document

... The differences found in this study for vitamin E, C of β -carotene (pro-vitamin A) content, between the two important periods of bee pollen production in the region (off-season [r] ... See full document

... Química Nova é uma revista de grande prestígio acadêmico e que alcançou esse nível de excelência pelo rigor e veracidade dos dados e informações publicadas, sob referendum de pesquisadores muito ...Química ... See full document

... About 4,758 of these species are medicinal plants within the national list of 9,935 species of Traditio- nal Chinese Medicines (TCM). The report indicates several causes for the concer[r] ... See full document

... La conveniencia del sistema de referencia de Gibbs se hace evidente al entender la adsorción como un intercambio de materia entre dos fases, la fluida y la GDS, permitiendo de esta ma[r] ... See full document

... El objetivo de este trabajo es proponer un experimento de química orgánica que involucre la extracción en frío y en caliente del aceite de almendras a partir de almendras dulces utiliz[r] ... See full document

... The carrot leaf dehydration conditions in air circulation oven were optimized through response surface methodology (RSM) for minimizing the degradation of polyunsaturated fatty acids, p[r] ... See full document

... This research work aimed at determining the UVA effectiveness (UVA I/UV ratio), by diffuse transmittance analysis, of sunscreens developed with a bioactive substance, the rutin, associa[r] ... See full document

... 22. Ezabadi, I.; Camoutsis, C. ; Zoumpoulakis, P. ; Geronikaki, A.; Soković, M.; Glamocilija, J.; Cirić, A.; Bioorg. Med. Chem. 2008, 16, 1150; Mondelli M, Bruné V, Borthagaray, G. ; Ellena, J.; Nasci- mento, O.; Leite, ... See full document

... ON-LINE PRECONCENTRATION SYSTEM USING A MICROCOLUMN PACKED WITH ALIZARIN RED S-MODIFIED ALUMINA FOR ZINC DETERMINATION BY FLAME ATOMIC ABSORPTION SPECTROMETRY.. A.M.[r] ... See full document

... The molar ratio of the colored product formed between cefaclor and ninhydrin reagent was investigated by applying the continuous variation Job’s method using an equimolar solution of t[r] ... See full document

... plain the drug release mechanism. In this equation, ft is the ratio of absolute cumulative amount of the drug released at time t and at infinite time, k is a constant incorporating structural and geometric characteristic ... See full document

... Los resultados muestran que con 100 mg/L de TiO 2 la reacción ocurre más rápido que con concentraciones mayores de catalizador donde se evidencia una disminución en la rapidez de reac[r] ... See full document

... The neutral pH demonstrated to be the best for chitosan, because of surface charge considerations and the analysis of the polycationic nature of chitosan, whereas acidic pH was the bes[r] ... See full document

... The wastewater investigated was obtained from the petroleum reinery LUBNOR (Lubriicantes e Derivados de Petróleo do Nordeste, Fortaleza, CE, Brazil). Chitin (light white; ashes 0.30%; 60-200 mesh; molecular weight: ... See full document

... De forma general, el procedimiento de Monfardini y colaboradores tiene tres etapas generales: obtención de un PEG lineal funcionalizado para reaccionar con grupos aminos; obtención de [r] ... See full document

... The proposed spectrophotometric low injection procedure for tetracycline and doxycycline determination is simple, inexpensive, allows rapid determination at low costs, and shows adequa[r] ... See full document

... 19. Chile, Instituto Nacional de Normalización; NCh 1333.Of78, 1987. 20. Gaete, H.; Aránguiz, F.; Cienfuegos, M.; Quim. Nova. 2007, 30, 885. 21. Guevara, S.; Oyarzún, J.; Maturana, H.; Agric. Téc. 2006, 66, 57. ... See full document

... En la Figura 3 se presentan la relación entre la entalpía de inmersión del carbón activado en soluciones del fenol a los diferentes valores de pH y se observa que para pHs de 3 y 5 los[r] ... See full document