Determination of Organic Iodine Compounds in Serum

1962 ◽  
Vol 8 (6) ◽  
pp. 647-653 ◽  
Author(s):  
Vincent J Pileggi ◽  
Richard J Henry ◽  
Milton Segalove ◽  
George C Hamill

Abstract RI — values of organic iodine compounds which interfere with the determination of serum protein-bound iodine (PBI) and butanol-extractable iodine (BEI) levels were obtained for the solvent system 2-butanol-4% NH4OH (3:1) utilizing descending paper chromatography. The feasibility of employing this system for identification of exogenous organic iodine in patients' sera was investigated. In general, the demonstration of these compounds or their metabolites was achieved only in sera obtained shortly after administration. This was due mainly to sensitivity limitations in the detection of the compounds on paper. Some data on the duration of interference with the PBI and BEI were also obtained for the radiopaque dyes Telepaque, Hypaque, Salipix, and Orabilex.

1968 ◽  
Vol 14 (6) ◽  
pp. 582-582

Abstract The article "Determination of Organic Iodine Compounds in Serum: IV. A New Nonincineration Technic for Serum Thyroxine" by Vincent J. Pileggi and Gerald Kessler—Clin. Chem. 14, 339 (1968)—contains an error. On page 340, under Reagents, the preparation of the bromate-bromide reagent should read: Bromate-bromide reagent (0.1 M KBrO3, 0.6 M KBr) KBrO3, 1.67 gm., and KBr, 7.14 gui., are dissolved in distilled water, and the solution made to a final volume of 100 ml.


1968 ◽  
Vol 14 (4) ◽  
pp. 339-347 ◽  
Author(s):  
Vincent J Pileggi ◽  
Gerald Kessler

Abstract Unidentified substances in acetic acid column eluates, obtained in the determination of serum thyroxine by column chromatography with the anion-exchange resin Dowex-1, prevented the direct determination of thyroxine by interference with the iodidecatalyzed ceric-arsenite reaction. Pretreatment of the eluates with Br2 or Cl2 eliminated the interference and permitted the direct assay of thyroxine by the ceric-arsenite system without incineration or wet digestion. Pretreatment with Br2 or Cl2 also significantly enhanced the catalytic activity of thyroxine, rendering its iodine nearly equivalent to inorganic iodide in the ceric-arsenite system. This nonincineration thyroxine assay is significantly more specific than methods that employ wet or dry ashing, because many organic iodine compounds used in diagnosis and therapy are not measured. A comparison of the nonincineration technic with the alkaline dry-ash method on 110 random serums revealed a mean difference of 0.13 µg./100 ml. (X = 4.5 µg./ 100 ml.), with the nonincineration technic yielding the higher result. This difference was found to be statistically significant (p< 0.001).


1964 ◽  
Vol 47 (2) ◽  
pp. 203-208
Author(s):  
Stanley E Katz ◽  
Joseph Spock

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.


2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Vaibhav S. Adhao ◽  
Suraj R. Chaudhari ◽  
Jaya P. Ambhore ◽  
Sunil Sangolkar ◽  
Raju R. Thenge ◽  
...  

Abstract Background Human immunodeficiency virus (HIV) causes severe life-threatening condition, i.e., AIDS. HIV destabilises an individual’s ability to prevent infection. Therefore, the combine medication lamivudine (LVD) and tenofovir disoproxil fumarate (TDF) are prescribed to suppress the amount of HIV infection in individual’s body; thus, the individual’s immune system could function properly. Consequently, the objective of present research work was to investigate robust and sensitive liquid chromatography avenue for simultaneous determination of lamivudine and tenofovir disoproxil fumarate in pure material and combined dosage form. Results The reversed-phase chromatographic separation has been performed through Hypersil BDS C18 column using solvent system composed of 10 mM potassium dihydrogen phosphate (pH 4.0): acetonitrile (60:40% v/v). The determination was executed at 30 oC at 1 mL/min rate for flow of solvent system through column. The eluents of column were monitored at 265 nm using Photodiode Array detector has revealed admirable retention times, i.e., 4.67 and 8.78 min for both drugs, respectively. The calibration curve demonstrated excellent linearity in the range of 10–50 μg/mL for lamivudine and tenofovir disoproxil fumarate with better determination coefficients was more than (r2 0.999). Conclusion The estimable method was effectively validated with respect to accuracy, precision, sensitive (limit of detection and limit of quantitation), robustness, ruggedness, and for selectivity and specificity. The value less than 2 for percentage relative standard deviation for accuracy, precision, robustness, and ruggedness satisfying the acceptance criteria as per procedure of International Council for Harmonization of Technical Requirements for Pharmaceuticals for Human Use.


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