Kinetic determination of morphine by means of Bray–Liebhafsky oscillatory reaction system using analyte pulse perturbation technique

2007 ◽  
Vol 582 (2) ◽  
pp. 367-374 ◽  
Author(s):  
Nataša D. Pejić ◽  
Slavica M. Blagojević ◽  
Slobodan R. Anić ◽  
Vladana B. Vukojević ◽  
Miroslav D. Mijatović ◽  
...  
Keyword(s):  
Perturbation Technique ◽  
Reaction System ◽  
Oscillatory Reaction ◽  
Kinetic Determination ◽  
Pulse Perturbation ◽  
Analyte Pulse Perturbation Technique

scholarly journals Pulse perturbation technique for determination of piroxicam in pharmaceuticals using an oscillatory reaction system

2013 ◽  
Vol 11 (2) ◽  
pp. 180-188 ◽  
Author(s):  
Nataša Pejić ◽  
Nataša Sarap ◽  
Jelena Maksimović ◽  
Slobodan Anić ◽  
Ljiljana Kolar-Anić
Keyword(s):  
Perturbation Technique ◽  
Kinetic Method ◽  
Reaction System ◽  
Direct Determination ◽  
Pharmaceutical Formulations ◽  
Oscillatory Reaction ◽  
Reaction Conditions ◽  
Good Sample ◽  
Pulse Perturbation

AbstractA simple and reliable novel kinetic method for the determination of piroxicam (PX) was proposed and validated. For quantitative determination of PX, the Bray-Liebhafsky (BL) oscillatory reaction was used in a stable non-equilibrium stationary state close to the bifurcation point. Under the optimized reaction conditions (T = 55.0°C, [H2SO4]0 = 7.60×10−2 mol L−1, [KIO3]0 = 5.90×10−2 mol L−1, [H2O2]0 = 1.50×10−1 mol L−1 and j 0 = 2.95×10−2 min−1), the linear relationship between maximal potential shift ΔE m , and PX concentration was obtained in the concentration range 11.2–480.5 µg mL−1 with a detection limit of 9.9 µg mL−1. The method had a rather good sample throughput of 25 samples h−1 with a precision RSD = 4.7% as well as recoveries RCV ≤ 104.4%. Applicability of the proposed method to the direct determination of piroxicam in different pharmaceutical formulations (tablets, ampoules and gel) was demonstrated.

Analyte Pulse Perturbation Technique for the Determination of 6-O-Acetylmorphine in Seized Street Drug Samples

2007 ◽  
Vol 80 (10) ◽  
pp. 1942-1948 ◽  
Author(s):  
Nataša Pejic ◽  
Slavica Blagojevic ◽  
Jana Vukelic ◽  
Ljiljana Kolar-Anic ◽  
Slobodan Anic
Keyword(s):  
Perturbation Technique ◽  
Pulse Perturbation ◽  
Analyte Pulse Perturbation Technique

scholarly journals Determination of p-nitrobenzene-azo-naphthol by an oscillating chemical reaction using the analyte pulse perturbation technique

2005 ◽  
Vol 3 (3) ◽  
pp. 502-510
Author(s):  
Jinzhang Gao ◽  
Kanjun Sun ◽  
Wu Yang ◽  
Huixian Zhou
Keyword(s):  
Perturbation Technique ◽  
Oscillation Amplitude ◽  
Chemical System ◽  
Sodium Thiocyanate ◽  
Injection Point ◽  
Sequential Determination ◽  
Pulse Perturbation ◽  
Analyte Pulse Perturbation Technique ◽  
Oscillating Reaction

AbstractA simple analytical method for the determination of p-nitrobenzene-azo-naphthol was proposed by a sequential perturbation with different amounts of p-nitrobenzene-azo-naphthol on an oscillating chemical system. The method involves a Cu(II)-catalysed oscillating reaction between hydrogen peroxide and sodium thiocyanate in alkaline medium with the aid of continuous-flow stirred tank reactor (CSTR). A good linear relationship between the changes, oscillation amplitude or/and period, and the concentration of p-nitrobenzene-azo-naphthol was obtained. The use of analyte pulse perturbation technique provides a possibility of sequential determination in a same oscillating system, due to a new steady state that reappeared rapidly after each perturbation. The calibration curve fits a linear equation very well when the concentration of p-nitrobenzene-azo-naphthol ranging from 5.2×10−7 to 3.3×10−3M. Influence of temperature, injection point, flow rate and reactants variables on this system were investigated in detail.

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