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|Title: ||Exploiting iminoquinone free radical production for thiol based drugs determination in pharmaceutical formulations|
|Other Titles: ||JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY|
|Authors: ||Chagas, Manoel Pinheiro|
Santos, Josué Carinhanha Caldas
Santos, Eduardo B. G. N.
Oliveira, Tiago D.
|Keywords: ||Iminoquinone radical reaction;Flow injection analysis;Determination of thiol drugs;Captopril|
|Issue Date: ||2009|
|Abstract: ||A spectrophotometric flow analysis procedure to determine Captopril (CPT) and N-acetyl-L-cysteine (NAC) in pharmaceutical formulations was developed based on the reaction with iminoquinone radical produced from the N,N-dimethyl-p-phenilenediamene (DMPD) oxidation in acid medium. The reagents addition order was evaluated and analytical parameters were optimized. The linear concentrations ranges were 2.5-90 and 5.0-50 mg L-1 for CPT and NAC, respectively. Limits of detection (3σ) were calculated at 0.22 and 1.8 mg L-1 and the relative standard deviation (N = 10) were lower than 1.0 and 2.1% for CPT and NAC, respectively. The procedure was employed for CPT and NAC determination in diverse pharmaceutical formulations and by applying paired t-test the results were in agreement with those obtained by reference methods for 95% confidence level.|
|Description: ||p. 1646-1652|
|Appears in Collections:||Artigos Publicados em Periódicos (Quimica)|
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