A Quantitative Assay for Urinary Porphobilinogen

1964 ◽  
Vol 10 (12) ◽  
pp. 1105-1111 ◽  
Author(s):  
Donald J Moore ◽  
Robert F Labbe
Keyword(s):  
Ion Exchange ◽  
Quantitative Determination ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Quantitative Assay ◽  
Batch Method ◽  
Qualitative Assay ◽  
Resin Treatment

Abstract A procedure has been developed for the rapid, quantitative determination of urinary porphobilinogen. Interfering substances are removed by selectively adsorbing the porphobilinogen with an ion-exchange resin using a batch method. After acid elution of the porphobilinogen, Ehrlich's reagent is added to produce the chromophore, which is then measured spectrophotometrically. Obtaining absorption at two wavelengths permits a differentiation of porphobilinogen from interfering reactants not removed by the resin treatment. This assay is relatively simple, dependable, highly reproducible for increased amounts, and more specific than the qualitative assay.

Fluorometric Determination of Chlortetracycline in Mixed Feeds

1964 ◽  
Vol 47 (2) ◽  
pp. 203-208
Author(s):  
Stanley E Katz ◽  
Joseph Spock
Keyword(s):  
Ion Exchange ◽  
Exchange Resin ◽  
Ammonium Hydroxide ◽  
Solvent System ◽  
Ion Exchange Resin ◽  
Alkaline Degradation ◽  
Fluorometric Determination ◽  
Mixed Feeds ◽  
Microbiological Assays

Abstract The fluorometric procedure for chlortetracycline in mixed feeds is based upon the degradation of chlortetracycline in alkaline solution to isochlortetracycline. The fluorescence of the isochlortetracycline is directly proportional to the concentration of chlortetracycline present prior to alkaline degradation. Chlortetracycline is extracted from mixed feeds with an acidmethanol solvent system, separated from the feed extract by adsorption on a Dowex 50 ion exchange resin, and eluted from the resin by ammonium hydroxide after conversion to isochlortetracycline. The isochlortetracycline is measured fluorometrically. Recoveries from known feeds are generally greater than 90% and agreements with microbiological assays are very close.

scholarly journals Magnetic ion-exchange resin treatment: Impact of water type and resin use

2008 ◽  
Vol 42 (8-9) ◽  
pp. 1977-1988 ◽  
Author(s):  
Max R.D. Mergen ◽  
Bruce Jefferson ◽  
Simon A. Parsons ◽  
Peter Jarvis
Keyword(s):  
Ion Exchange ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Water Type ◽  
Magnetic Ion ◽  
Resin Treatment

Determination of cadmium(II) with a carbon paste electrode modified with an ion-exchange resin

The Analyst ◽  
1989 ◽  
Vol 114 (3) ◽  
pp. 397-399 ◽  
Author(s):  
Lucas Hernández ◽  
Jose M. Melguizo ◽  
Manuel H. Blanco ◽  
Pedro Hernández
Keyword(s):  
Ion Exchange ◽  
Carbon Paste Electrode ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Carbon Paste ◽  
Paste Electrode

Determination of radium in water by liquid scintillation counting after preconcentration with ion-exchange resin

1984 ◽  
Vol 56 (4) ◽  
pp. 761-763 ◽  
Author(s):  
Hideo. Higuchi ◽  
Masaki. Uesugi ◽  
Kaneaki. Satoh ◽  
Naoyuki. Ohashi ◽  
Masayasu. Noguchi
Keyword(s):  
Ion Exchange ◽  
Liquid Scintillation Counting ◽  
Liquid Scintillation ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Scintillation Counting

Determination of serotonin in tissues using an ion-exchange resin

1964 ◽  
Vol 9 (5) ◽  
pp. 427-433 ◽  
Author(s):  
Virginia E. Davis ◽  
J.A. Huff ◽  
H. Brown
Keyword(s):  
Ion Exchange ◽  
Exchange Resin ◽  
Ion Exchange Resin
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