Rapid and Sensitive Synergistic Extraction and Spectrophotometric Determination of Silver(I) using 1-(2′,4′-Dinitro aminophenyl)-4,4,6-trimethyl-1,4-dihydropyrimidine-2-thiol: Analysis of Real Samples

2011 ◽  
Vol 50 (19) ◽  
pp. 11270-11279 ◽  
Author(s):  
Ganesh S. Kamble ◽  
Ashwini P. Gaikwad ◽  
Balasaheb N. Kokare ◽  
Sanjay S. Kolekar ◽  
Sung. H. Han ◽  
...  
Keyword(s):  
Spectrophotometric Determination ◽  
Synergistic Extraction ◽  
Real Samples

scholarly journals H-point Standard Addition Method for the Simultaneous Spectrophotometric Determination of Captopril and Hydrochlorothiazide in Pharmaceutical Formulations

2021 ◽  
pp. 77-85
Keyword(s):  
Spectrophotometric Determination ◽  
Standard Addition ◽  
Pharmaceutical Formulations ◽  
Standard Addition Method ◽  
Addition Method ◽  
Real Samples ◽  
Relative Standard ◽  
Recovery Percentage ◽  
Precision And Accuracy

Simultaneous spectrophotometric determination of captopril and hydro-chlorothiazide in pharmaceutical formulations by the H-point standard addition method (HPSAM) is described. Absorbance at 211.5 and 230.3 nm was monitored upon the addition of standard solutions of captopril. The results showed that in prepared mixtures, captopril and hydrochlorothiazide can be determined simultaneously at concentration ratios varying from 1.0:0.8 to 2.5:1.5 μg/mL, respectively. Percentage recovery was found to be 95.33–104.37% for captopril and 96.8–105% for hydrochlorothiazide, with a relative standard deviation (RSD) of 2.46%. The method was successfully used to evaluate the antihypertensive captopril drug in a binary combination of hydrochlorothiazide in real samples with high precision and accuracy within the recovery percentage.

scholarly journals Vortex assisted-supramolecular solvent based microextraction coupled with spectrophotometric determination of triclosan in environmental water samples

2017 ◽  
Vol 15 (1) ◽  
pp. 255-262 ◽  
Author(s):  
Anele Mpupa ◽  
Geaneth P. Mashile ◽  
Philiswa N. Nomngongo
Keyword(s):  
Spectrophotometric Determination ◽  
Environmental Water ◽  
Real Samples ◽  
Environmental Friendly ◽  
Relative Standard ◽  
Supramolecular Solvent ◽  
Experimental Parameters ◽  
Preconcentration Factor ◽  
Wastewater Samples

AbstractA simple, fast and environmental friendly vortex assisted-supramolecular solvent based microextraction (VA-SSME) method was developed for the preconcetration of triclosan in wastewater prior to UV spectrophotometric determination. To achieve maximum sensitivity and accuracy for the target analyte, the experimental parameters affecting the VA-SSME procedure were optimized using response surface methodology (RSM). Under optimised conditions, the correlation coefficient (R2) and recoveries were 0.9994 and 100.31-118.5%, respectively. The intra-day (repeatability) and inter-day (reproducibility) precisions expressed in terms of relative standard deviation (RSD) were 2-4% and 5.2%, respectively. The preconcentration factor and limits of detection (LOD) and quantification (LOQ) were found to be 90, 0.28 μg L−1 and 0.92 μg L−1, respectively. The developed VA-SSME/UV method was applied for the determination of triclosan in real samples collected over a period of three months. The analytical results obtained showed that triclosan was frequently detected in influent wastewater samples but was not detected in effluent samples.

Comparison of Column Solid-Phase Extraction Procedures for Spectrophotometric Determination of E129 (Allura Red) in Foodstuff, Pharmaceutical, and Energy Drink Samples

2015 ◽  
Vol 98 (4) ◽  
pp. 946-952 ◽  
Author(s):  
Abdullah Taner Bişgin ◽  
Mustafa Uçan ◽  
İbrahim Narin
Keyword(s):  
Adsorption Isotherm ◽  
Spectrophotometric Determination ◽  
Solid Phase ◽  
Energy Drink ◽  
Sample Volume ◽  
Linear Calibration ◽  
Real Samples ◽  
The Real ◽  
Allura Red

Abstract Two novel spectrophotometric determination procedures based on retention of Allura Red onto Amberlite XAD-1180 and XAD-16 resins for its preconcentration, purification, and separation were developed. Analytical parameters of the methods including pH, eluent type, sample volume, and sample and eluent flow rates, were investigated and optimized. Interference effects of some cations, anions, and widely used food dyes were also investigated. Detection limits of the two methods were found to be 1.2 and 1.5 μg/L for XAD-1180 and XAD-16 columns, respectively, under optimum conditions. Linear calibration curve ranges of the methods were 0.4–8.0 and 0.5–6.0 μg/mL of Allura Red for XAD-1180 and XAD-16 resins, respectively. Preconcentration factors were found as 80 for both the XAD-1180 and XAD-16 columns using maximum sample volume and minimum eluent volume. RSDs of the methods were below 6% throughout all experiments. All absorbance measurements were performed at 506 nm. Validations of the methods were performed comparatively with determination of the Allura Red contents of some foodstuff, pharmaceutical, and energy drink samples. Allura Red concentrations in investigated solid and liquid samples ranged from 298 to 501 μg/g and 53.8 to 508 μg/mL, respectively. Satisfactory results were obtained from the real samples analysis. Allura Red contents of samples were determined to be highly similar using the two extraction methods. Comparisons of the methods were performed by analysis of Allura Red contents of the real samples. In addition to analytical parameters, adsorption isotherm studies were performed for the two kinds of Amberlite resins. It was observed that developed methods fit the linear form of the Freundlich adsorption isotherm model. All of the experimental results suggested that the developed SPE procedures are suitable for separation, preconcentration, and determination of Allura Red in solid and liquid matrixes.

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