Quantitative determination of methyltestosterone in drug forms by amperometric titration

1984 ◽  
Vol 18 (11) ◽  
pp. 790-792
Author(s):  
Yu. V. Tsukanov ◽  
L. I. Brutko ◽  
Z. A. Gallai ◽  
N. M. Sheina ◽  
N. V. Shvedene
Keyword(s):  
Quantitative Determination ◽  
Amperometric Titration

Determination of —SH and —SS— groups in proteins. I. A reassessment of the use of methylmercuric iodide

1968 ◽  
Vol 46 (19) ◽  
pp. 3033-3040 ◽  
Author(s):  
W. F. Forbes ◽  
C. R. Hamlin
Keyword(s):  
Quantitative Determination ◽  
Disulfide Bond ◽  
Bond Cleavage ◽  
Reaction Times ◽  
High Reactivity ◽  
Insoluble Protein ◽  
Amperometric Titration ◽  
General Belief ◽  
Experimental Procedure

Amperometric titration with methylmercuric iodide was found to be unsatisfactory for the quantitative determination of —SH and —SS— values in several soluble proteins. It is concluded that the "high reactivity" of the mercurial has previously been overemphasized. Consistent values can, however, be obtained by permitting protein samples to react with an excess of the mercurial, for about 100 h, followed by the polarographic estimation of the remaining reagent. Contrary to general belief, this procedure was found to be more precise than amperometric titration, and, if appropriate precautions are taken, it is applicable to considerably smaller amounts (<0.5 μmole —SH or —SS—) of either soluble or insoluble protein. The necessary experimental procedure is described and results are reported for several proteins. For the compounds studied, methylmercuric iodide did not react at non-sulfhydryl sites, and did not additionally bind to the mercaptides formed; there was no indication of disulfide bond cleavage, despite the long reaction times used.

scholarly journals Determination of submillimolar concentration of ferrate(VI) in alkaline solutions by amperometric titration

2011 ◽  
Vol 9 (5) ◽  
pp. 808-812 ◽  
Author(s):  
Dmitriy Golovko ◽  
Virender Sharma ◽  
Olga. Pavlova ◽  
Elena. Belyanovskaya ◽  
Igor. Golovko ◽  
...  
Keyword(s):  
Quantitative Determination ◽  
Linear Relationship ◽  
Diffusion Current ◽  
Alkaline Solutions ◽  
Titration Method ◽  
Amperometric Titration ◽  
Hydroxide Solution

AbstractA new amperometric titration method was developed for quantitative determination of ferrate(VI) (FeVIO42−) in the 7.06×10−5−5.73×10−3 M concentration range. Chromium(III) hydroxide solution was used as the titrant. The diffusion current (Id) had a linear relationship with the concentration of ferrate(VI) and slopes were dependent on the concentration of NaOH. The amperometric titration could detect a lower concentration of ferrate(VI) than could potentiometric and colorimetric titrations. The method was applied successfully to determine concentrations of ferrate(VI), generated electrochemically, in strong alkaline solutions.

Determination of Thiazole Type of Rubber Accelerators by Amperometric Titration

1962 ◽  
Vol 35 (3) ◽  
pp. 665-670
Author(s):  
Pronoy K. Chatterjee ◽  
D. Banerjee ◽  
Anil K. Sircar
Keyword(s):  
Quantitative Determination ◽  
The Other ◽  
Amperometric Titration ◽  
Decomposition Products ◽  
Rubber Accelerators

Abstract The method of amperometric titration has been applied for the quantitative determination of mercaptobenzothiazole, zinc benzothiazolylmercaptide and dibenzothiazolyl disulfide, the latter two being known to constitute the decomposition products of the first during vulcanization reaction. It has been found that mercaptobenzothiazole as it is, or formed by a suitable reaction from the other two accelerators mentioned above, can be quantitatively estimated amperometrically. The total amount of mercaptobenzothiazole present in a mixture of two or all three of the above-mentioned accelerators and also the total amount of mercaptobenzothiazole liberated in a mixture of two or three of them can be quantitatively estimated.

Quantitative determination of longitudinal and transverse cross-relaxation rates

1999 ◽  
Vol 96 (9/10) ◽  
pp. 1608-1615
Author(s):  
T. E. Malliavin ◽  
H. Desvaux ◽  
M. A. Delsuc
Keyword(s):  
Quantitative Determination ◽  
Cross Relaxation ◽  
Relaxation Rates

Quantitative Determination of Gallic acid and Cyanidin-3-O-Glucoside within Sumac Extracts by HPLC-MS/MS

Planta Medica ◽  
2011 ◽  
Vol 77 (12) ◽  
Author(s):  
M Koşar ◽  
F Göger ◽  
N Kırımer ◽  
KHC Başer
Keyword(s):  
Quantitative Determination ◽  
Gallic Acid

Quantitative determination of compound leads in Schiniopsis brasiliensis Engler

Planta Medica ◽  
2014 ◽  
Vol 80 (16) ◽  
Author(s):  
FHA Fernandes ◽  
RSA Batista ◽  
G Véras ◽  
FS Souza ◽  
ACD Medeiros
Keyword(s):  
Quantitative Determination
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