Characterization of naphthalene dicarboxylic acids. 3. Separation on Dowex 1-× 8 anion-exchange resin

Optimum conditions for the separation of the acidic amino acids glutamic, aspartic, and cysteic on an anion exchange resin, Dowex-1 × 8, have been studied. The sample to be analyzed is adjusted to pH 7 and placed on a column of Dowex-1 × 8 previously equilibrated with 0.1 M acetate buffer at pH 4. Glutamic and aspartic acids are separated by elution with 0.1 M acetate buffer at pH 4.0–4.6. Cysteic acid is eluted with 0.2 M acetate buffer at pH 5.5–5.9. With this method quantitative separation of synthetic mixtures of the acidic amino acids has been achieved. This method has also been used to determine the dicarboxylic amino acids in acid hydrolyzates of various proteins, of normal protein-free plasma, and of normal urine.

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High cadmium-109 recovery from a dissolved silver target solution using dowex 1×8 anion-exchange resin

Radiochemistry ◽

10.1134/s1066362210050218 ◽

2010 ◽

Vol 52 (5) ◽

pp. 565-569 ◽

Cited By ~ 4

Author(s):

M. Sadeghi ◽

M. Mirzaii ◽

Z. Gholamzadeh ◽

P. Sarabadani ◽

A. Sattari

Keyword(s):

Anion Exchange ◽

Exchange Resin ◽

Anion Exchange Resin ◽

Silver Target ◽

Dowex 1

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Syntheses and Characterization of N-(Indolyl)pyridinium Salts and of Their Ylides

Zeitschrift für Naturforschung B ◽

10.5560/znb.2014-3324 ◽

2014 ◽

Vol 69 (5) ◽

pp. 605-614 ◽

Cited By ~ 1

Author(s):

Nazar Pidlypnyi ◽

Sandra Kaul ◽

Sebastian Wolf ◽

Martin H. H. Drafz ◽

Andreas Schmidt

Keyword(s):

Anion Exchange ◽

Exchange Resin ◽

Anion Exchange Resin ◽

Pyridinium Salts ◽

Ring Transformation ◽

Pyrylium Salts

3-Methylindole reacts with pyridines in the presence of NBS to give indol-2-yl-pyridinium salts which were converted into their ylides by an anion exchange resin in its hydroxide form. Indol-3- amine was subjected to a nucleophilic ring transformation with pyrylium salts which resulted in the formation of indol-3-yl-pyridinium salts, the 2,4,6-trimethylpyridinium derivative of which proved to be unstable. The 2,4,6-triphenylpyridinium derivate was deprotonated to the corresponding ylide. The isomeric indol-2-yl and indol-3-yl derivatives are cycloimmonium ylides which are members of the compound class of heterocyclic mesomeric betaines (MB). By contrast, the ylide of indol- 2-yl-pyrrolidinium is a cycloammonium ylide. It was prepared by reaction of 3-methylindole with pyrrolidine in the presence of NBS, followed by deprotonation.

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Preparation and characterization of anion exchange resin decorated with magnetite nanoparticles for removal of p-toluic acid from aqueous solution

Journal of Magnetism and Magnetic Materials ◽

10.1016/j.jmmm.2014.09.065 ◽

2015 ◽

Vol 375 ◽

pp. 177-183 ◽

Cited By ~ 6

Author(s):

Morteza Davarpanah ◽

Ali Ahmadpour ◽

Tahereh Rohani Bastami

Keyword(s):

Aqueous Solution ◽

Anion Exchange ◽

Magnetite Nanoparticles ◽

Exchange Resin ◽

Anion Exchange Resin

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THE CHROMATOGRAPHIC DETERMINATION OF GLUTAMIC, ASPARTIC, AND CYSTEIC ACIDS USING AN ANION EXCHANGE RESIN

Canadian Journal of Biochemistry and Physiology ◽

10.1139/o57-143 ◽

1957 ◽

Vol 35 (12) ◽

pp. 1249-1258 ◽

Cited By ~ 2

Author(s):

A. M. Marko

Keyword(s):

Amino Acids ◽

Anion Exchange ◽

Exchange Resin ◽

Anion Exchange Resin ◽

Chromatographic Determination ◽

Acetate Buffer ◽

Cysteic Acid ◽

Acidic Amino Acids ◽

Normal Urine ◽

Dowex 1

Optimum conditions for the separation of the acidic amino acids glutamic, aspartic, and cysteic on an anion exchange resin, Dowex-1 × 8, have been studied. The sample to be analyzed is adjusted to pH 7 and placed on a column of Dowex-1 × 8 previously equilibrated with 0.1 M acetate buffer at pH 4. Glutamic and aspartic acids are separated by elution with 0.1 M acetate buffer at pH 4.0–4.6. Cysteic acid is eluted with 0.2 M acetate buffer at pH 5.5–5.9. With this method quantitative separation of synthetic mixtures of the acidic amino acids has been achieved. This method has also been used to determine the dicarboxylic amino acids in acid hydrolyzates of various proteins, of normal protein-free plasma, and of normal urine.

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