Catalytic-kinetic determination of thioureas by a biamperostatic method with iodine-azide as the indicator reaction

Kinetic Spectrophotometric Determination of Sulbutiamine in Pharmaceutical Preparations and in Human Serum

“…This reaction, however, is very much accelerated in the presence of sulfide or thiol-containing compounds in the medium. 9,[16][17][18][19][20][21][22][23][24][25][26][27] This reaction can be followed spectrophotometrically by monitoring the change in the absorbance at 348 nm.…”

“…[18][19][20][21][22][23][24][25][26][27] The aim of the present study was to establish a catalytickinetic spectrophotometric procedure for the determination of sulbutiamine in pharmaceutical dosage forms and in human serum, based on its catalytic effect on an iodine-azide reaction.…”

Kinetic Spectrophotometric Determination of Ranitidine

“…This reaction, however, is very much accelerated in the presence of sulfide or thiol-containing compounds in the medium. [44][45][46][47][48][49][50][51][52][53] This reaction can be followed spectrophotometrically by monitoring the change in the absorbance at 348 nm.…”

“…Based on the (A-Å) and A values of standard solutions, the proposed methods were found to give a rectilinear calibration curve over the concentration ranges of 4-24 mg/mL, 2-16 mg/mL and 4-40 mg/mL with a regression coefficient (r) of 0.9995, 0.9999 and 0.9997 for M1, M2A and M2B, respectively. The detection limit 23 was found to be 0.76, 0.15 and 0.8 mg/mL, while the quantification limit was found to be 4, 2 and 4 mg/mL for methods 1, 2A and 2B, respectively ( Table 2).…”

“…The catalytic-kinetic spectrophotometric method 19,[20][21][22][23][24][25][26][27][28][29] is one of the most attractive approaches for the ultra trace determination of certain chemicals. Kinetic methods of analysis possess several potential advantages over equilibrium methods.…”