column chromatography
Column chromatography with almécega resin: a project for experimental organic chemistry.
... COLUMN CHROMATOGRAPHY WITH ALMÉCEGA RESIN: A PROJECT FOR EXPERIMENTAL ORGANIC ...gel column chromatography technique is proposed in the present ...
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CM-Sephadex C-25 Column Chromatography
... ABSTRACT: Due to the development of antibiotic resistance in microorganisms, antimicrobial peptides from natural sources have attracted attention in recent times. Several antimicrobial peptides have been isolated from a ...
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J. Braz. Chem. Soc. vol.22 número10
... Melting points (mp) were observed in an electrothermal melting point apparatus. Flash column chromatography was carried out using 200-300 mesh silica gel at increased pressure. Aromatic thioureas were ...
37
Rev. bras. farmacogn. vol.24 número3
... MeOH extract of Abutilon pakistanicum Jafri & Ali, Malvaceae, was suspended in water and fractionated into n-hexane, CHCl 3 , AcOEt, n-BuOH, and H 2 O fractions. The AcOEt-soluble fraction was subjected to repeated ...
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Rev. bras. farmacogn. vol.12 suppl.1
... vacuum column chromatography being eluted with hexane, chloroform, ethyl acetate and ...gel column chromatography, being eluted with chloroform, ethyl acetate and methanol in mixtures of ...
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J. Braz. Chem. Soc. vol.27 número7
... Synthesis of 3-(2-nitro-1H-imidazol-1-yl)propane-1,2-diol (4) Trifluoroacetic acid (32.7 g, 287.4 mmol) was added to a solution of compound 3 (4.64 g, 20.4 mmol) in anhydrous MeOH (20 mL) and stirred at room temperature ...
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J. Braz. Chem. Soc. vol.19 número3
... CDCl 3 as solvent and TMS as internal standard. IR spectra were run on a Perkin-Elmer 1000 FT-IR spectrometer using KBr pellets. Melting points were determined on a Mettler FP5 apparatus and are uncorrected. Gravity ...
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J. Braz. Chem. Soc. vol.16 número4
... A mixture of compound 4 (0.300 g, 0.710 mmol), ethanol (9.0 mL), NaOAc (0.290 g, 3.535 mmol) and 10% Pd-C (0.075 g, 0.070 mmol) was shaken with hydrogen (45 psi) in a Parr apparatus for 3 h at room temperature. The ...
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Mono and diterpenes from seeds of Xylopia sericea.
... to column chromatography on silica gel eluting with a gradient of solvents of increasing polarity from n-hexane and ethyl acetate to ...silica column chromatography of the crude fractions led ...
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J. Braz. Chem. Soc. vol.17 número7
... The known compounds 2 and 3 were also isolated from the same extract of P. aquatica by column chromatography on silica gel. The spectroscopic data from compounds 2 and 3 were consistent with those published ...
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J. Braz. Chem. Soc. vol.13 número1
... Compounds 4 and 5 were isolated as their methyl esters (4a and 5a) after esterification from diazomethane of a fraction obtained from a column chromatography of the crude biotransformated product. ...
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Quím. Nova vol.36 número6
... The crude extracts of artichoke were pre-separated by polyamide column chromatography. A total of 22 g of sample 1 and 12 g of sample 2 were obtained in 60% ethanol (1% acetic acid) and 95% ethanol (1% ...
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A proteomic approach for comprehensively screening substrates of protein kinases such as Rho-kinase.
... affinity column chromatography using the catalytic domain of Rho-kinase and shotgun LC-MS/MS analysis is powerful for identification of substrates, including known substrates and novel ones, such as DCX, ...
9
Purification and characterization of hemocyte phenoloxidases in Chilo suppressalis walker (Lepidoptera: Crambidae)
... abstract: In the current study, two phenoloxidases (POs) from the larvae of Chilo suppressalis Walker were extracted and purified by column chromatography using Sepharyl G-100 and DEAE-Cellulose fast flow ...
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J. Braz. Chem. Soc. vol.16 número3B
... Methyl 2-(benzyloxy)-6-hydroxybenzoate (9). A solution of methyl 2,6-dihydroxybenzoate (0.1002 g, 0.596 mmol) and tetrabutylammonium fluoride (TBAF) (0.3751 g, 1.190 mmol) in DMF (5 mL) was stirred under nitrogen ...
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J. Braz. Chem. Soc. vol.11 número4
... temperature. The reaction mixture was extracted three times with 15 mL of chloroform. The organic layer was washed with saturated NaCl solution, dried over Na 2 SO 4 and con- centrated under reduced pressure. The residue ...
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J. Braz. Chem. Soc. vol.27 número10
... chromatography (TLC) analyses were performed using silica gel 60F 254 precoated plates, with detection by UV-absorption (254 nm) and by spraying with p-anisaldehyde and phosphomolybdic acid solutions followed by ...
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J. Braz. Chem. Soc. vol.19 número7
... by column chromatography to afford (±)-6 (513 mg, 91%) as a colourless oil, with identical spectroscopic characteristics as previously described for (+)-drimenyl acetate from natural ...
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J. Braz. Chem. Soc. vol.16 número6A
... The further reduction of the carbonyl, in compounds 2b-e, is probably due to the presence of the trifluoromethyl group in alfa-position that increases the reactivity of the carbonyl toward the nucleophilic addition of ...
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Quím. Nova vol.31 número1
... repeated column chromatography over cellulose, Polyamide S and Sephadex LH-20 of the ethyl acetate extract to was submitted to fractionation, and the flavonoid fractions were analysed by ...
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