[PDF] Top 20 J. Braz. Chem. Soc. vol.25 número8
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J. Braz. Chem. Soc. vol.25 número8
... oxidation and they observed a better performance for ternary material when compared with PtSn, they showed a considerable increase on electrochemical activity after acid treatment on [r] ... See full document
9
J. Braz. Chem. Soc. vol.25 número8
... AV-400, DRX-500 or AV III-600 spectrometer, using tetramethylsilane (TMS) as internal standard. Chemical shifts were reported in units of d (ppm) and coupling constants (J) were expressed in Hz. Column ... See full document
9
J. Braz. Chem. Soc. vol.25 número8
... fraction, as well as of the magnetic exchange constant J can be obtained through a least squares fitting procedure of the χ(T) plot. The Heisenberg-Dirac-van Vleck Hamitonian used to fit the data has been , ... See full document
8
J. Braz. Chem. Soc. vol.25 número8
... Taking into consideration the results of the optimization method and the practical aspects of the SLE/LTP technique, a 4.0000 g sample of strawberries in 4.0 mL of acetonitrile was chosen. The mixture was stirred for 15 ... See full document
8
J. Braz. Chem. Soc. vol.25 número8
... The influencing parameters of VA-HF-LPME sample preparation method, such as organic solvents (acceptor phase), pH of sample solution (donor phase), sample volume, concentration of NaOH[r] ... See full document
8
J. Braz. Chem. Soc. vol.25 número8
... flasks, where they were kept at a temperature of –18 °C. A Varian CP3900 gas chromatograph equipped with a flame ionization detector (FID) was used for the compositional analysis of the essential oils. Samples (0.4 µL in ... See full document
8
J. Braz. Chem. Soc. vol.25 número8
... constants J [Hz] were directly taken from the spectra and are not averaged. Splitting patterns are designated as s (singlet), d (doublet), t (triplet), q (quartet), m (multiplet) and br (broad). Low-resolution ... See full document
11
J. Braz. Chem. Soc. vol.25 número8
... The electrooxidation of the SDZ (volume of 0.5 L, with a SDZ initial concentration of 250 mg L -1 ) obtained at optimized conditions (current density of 36 mA cm -2 , pH 7.0 and volume[r] ... See full document
9
J. Braz. Chem. Soc. vol.25 número8
... 3. Yunes, R. A.; Cechinel-Filho, V.; Química de Produtos Naturais, Novos Fármacos e a Moderna Farmacognosia, Editora UNIVALI: Itajaí, 2009; Songsiang, U.; Wanich, S.; Pitchuanchom, S.; Netsopa, S.; Uanporn, K.; Yenjai, ... See full document
5
J. Braz. Chem. Soc. vol.25 número8
... The effect of the crosslinking agent (glutaraldehyde or genipin) and concentration of aqueous chitosan solution used in the spray drying on the drug release was also evaluated.. Exper[r] ... See full document
10
J. Braz. Chem. Soc. vol.25 número8
... transient lifetimes between 15 to 30 ns were found for solutions examined immediately after preparation, whereas the 150 ns component was only observed when the solutions were allowed to rest for about 24 h or longer. ... See full document
7
J. Braz. Chem. Soc. vol.25 número8
... A method for the quantification of the alkaloids harmane and harmine in sour passion fruit ( Passiflora edulis f. Degener, Passifloraceae) pulp and seeds by stir-bar sorptive extracti[r] ... See full document
12
J. Braz. Chem. Soc. vol.25 número8
... V. M.; Mitkin, O. D.; Okun, I. M.; Pharm. Chem. J. 2012, 46, 406. 15. Ramaiah, M. J.; Pushpavalli, S. N. C. V. L.; Lavanya, L.; Bhadra, K.; Haritha, V.; Patel, N.; Tamboli, J. R.; Kamal, A.; ... See full document
7
J. Braz. Chem. Soc. vol.25 número8
... distilled and deionized water (Milli-Q-Millipore, Bedford, MA, USA). The photoreactor system consisted of a 500 mL cylindrical glass body. A 13 W germicidal low pressure mercury vapor lamp able to produce UV at 253.7 nm, ... See full document
8
J. Braz. Chem. Soc. vol.25 número8
... used as internal standard. The chemical shifts are reported in ppm ( d); coupling constants (J) values are given in Hertz (Hz). Signal multiplicities are represented by: s (singlet), d (doublet), dd (double ... See full document
7
J. Braz. Chem. Soc. vol.25 número8
... groups bonded to C-16 and C-29 may contribute in the increase of cytotoxicity of friedelane-type triterpenes against 4T1 cells. Moreover, hydroxyl group bonded to C-3 also contributed[r] ... See full document
8
J. Braz. Chem. Soc. vol.25 número8
... For ZnKX catalysts, IR results reveal that chemisorbed methanol converts to formaldehyde more easily, the relative intensity of unidentate formate increases, and the concentration of[r] ... See full document
9
J. Braz. Chem. Soc. vol.25 número8
... The improved catalytic performances of alkali-treated catalysts are mainly attributed to the created mesopores and the decreased number of strong acid sites during the alkali treatment[r] ... See full document
7
J. Braz. Chem. Soc. vol.25 número8
... Results obtained in this work showed a suitable method for the determination of trichlorfon, trifluralin, hexachlorobenzene, lindane, chlorpyrifos methyl, chlorothalonil, kresoxim met[r] ... See full document
10
J. Braz. Chem. Soc. vol.25 número8
... The standards of of 5α-androstan-3β-ol (98% purity), 5α-cholestane (99% purity), 5β-cholestan-3β-ol (> 98% minimum purity), 5β-cholestan-3α-ol (> 95% minimum purity), cholest-5-en-3β-ol (94% purity), 5α-cholestan- ... See full document
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