ChemInform Abstract: Simultaneous Determination of Niobium and Tantalum with Bromopyrogallol Red in the Presence of Cetylpyridinium Bromide and Triton X 305.

ChemInform ◽  
2010 ◽  
Vol 22 (25) ◽  
pp. no-no
Author(s):  
A. T. PILIPENKO ◽  
A. N. MASKO ◽  
E. G. MAKSIMYUK
Keyword(s):  
Simultaneous Determination ◽  
Cetylpyridinium Bromide ◽  
Bromopyrogallol Red ◽  
Triton X

scholarly journals Determination of Antidepressants in Human Plasma by Modified Cloud-Point Extraction Coupled with Mass Spectrometry

2020 ◽  
Vol 13 (12) ◽  
pp. 458
Author(s):  
Elżbieta Gniazdowska ◽  
Natalia Korytowska ◽  
Grzegorz Kłudka ◽  
Joanna Giebułtowicz
Keyword(s):  
Mass Spectrometry ◽  
Simultaneous Determination ◽  
Human Plasma ◽  
Cloud Point ◽  
Extraction Efficiency ◽  
Cloud Point Extraction ◽  
Limiting Factor ◽  
Drug Determination ◽  
Triton X

Cloud-point extraction (CPE) is rarely combined with liquid chromatography coupled to mass spectrometry (LC–MS) in drug determination due to the matrix effect (ME). However, we have recently shown that ME is not a limiting factor in CPE. Low extraction efficiency may be improved by salt addition, but none of the salts used in CPE are suitable for LC–MS. It is the first time that the influences of a volatile salt—ammonium acetate (AA)—on the CPE extraction efficiency and ME have been studied. Our modification of CPE included also the use of ethanol instead of acetonitrile to reduce the sample viscosity and make the method more environmentally friendly. We developed and validated CPE–LC–MS for the simultaneous determination of 21 antidepressants in plasma that can be useful for clinical and forensic toxicology. The selected parameters included Triton X-114 concentration (1.5 and 6%, w/v), concentration of AA (0, 10, 20 and 30%, w/v), and pH (3.5, 6.8 and 10.2). The addition of 10% of AA increased recovery twice. For 20 and 30% (w/v) of AA, three phases were formed that prolonged the extraction process. The developed CPE method (6% Triton X-114, 10% AA, pH 10.2) was successfully validated through LC–MS/MS simultaneous determination of 21 antidepressants in human plasma. The linearity was in the range of 10–750 ng/mL (r2 > 0.990).

scholarly journals H-Point Standard Addition Method for Simultaneous Determination of Eosin and Erytrosine

2011 ◽  
Vol 8 (4) ◽  
pp. 1979-1985 ◽  
Author(s):  
Amandeep Kaur ◽  
Usha Gupta
Keyword(s):  
Binary Mixture ◽  
Simultaneous Determination ◽  
Standard Addition ◽  
Standard Addition Method ◽  
Micellar Media ◽  
Addition Method ◽  
Commercial Products ◽  
Food Dyes ◽  
Triton X

A new, simple, sensitive and selectiveH-point standard addition method (HPSAM) has been developed for resolving binary mixture of food colorants eosin and erythrosine, which show overlapped spectra. The method is based on the complexation of food dyes eosin and erythrosine with Fe(III) complexing reagent at pH 5.5 and solubilizing complexes in triton x-100 micellar media. Absorbances at the two pairs of wavelengths, 540 and 550 nm (when eosin acts as analyte) or 518 and 542 nm (when erythrosine act as analyte) were monitored. This method has satisfactorily been applied for the determination of eosin and erythrosine dyes in synthetic mixtures and commercial products.

A reversed phase HPLC-UV method for the simultaneous determination of residual formaldehyde and Triton X-100 in vaccine products

2021 ◽  
pp. 122977
Author(s):  
Burki Rajendar ◽  
M V N Janardhan Reddy ◽  
Ch N V Suresh ◽  
Sampreeth kumar Gambheerrao ◽  
Ramesh V. Matur
Keyword(s):  
Simultaneous Determination ◽  
Reversed Phase ◽  
Reversed Phase Hplc ◽  
Triton X

The simultaneous determination of Fe(III) and Cu(II) in the presence of Zn(II) using 2-(5-bromo-2-pyridylazo)-5-(diethylamino)phenol

1988 ◽  
Vol 53 (12) ◽  
pp. 3040-3049 ◽  
Author(s):  
Vladimír Buršík ◽  
Vlastimil Kubáň ◽  
Lumír Sommer
Keyword(s):  
Simultaneous Determination ◽  
Copper Ions ◽  
Ternary Mixtures ◽  
Experimental Conditions ◽  
Spectrophotometric Methods ◽  
Chelate Formation ◽  
Binary And Ternary Mixtures ◽  
Triton X ◽  
The Given

Spectrophotometric methods were employed to study the chelate formation between Fe(III) ions and 2-(5-bromo-2-pyridylazo)-5-(diethylamino)phenol (BrPADAP) in dimethylformamide (φ = 20%) and Triton X-100 (φ = 0·1%). The ML2 chelate with absorption maxima at 535 and 590 nm and molar absorption coefficients of 6·5 and 8·2 m2 mmol-1 is formed quantitatively in the pH interval 3·5 - 4·0 for at least a seven-fold concentration excess of BrPADAP. Concentrations of c(Fe) = 1·6 - 8·1 μmol l-1 can be determined independently in 0·1M acetate buffer with pH 3·6. Iron and copper ions can be determined simultaneously in the presence of zinc ions in binary or ternary mixtures in the concentration ranges c(Fe) = 2 - 8 μmol l-1 and c(Cu) = c(Zn) = 3 - 16 μmol l-1. The relative deviations in the calculated concentrations, Δcr, are 1 - 4% for Fe and up to 5% for Cu in binary and ternary mixtures with equivalent concentrations up to a concentration excess of one component of five-fold in binary mixtures or of one or two components of up to three-fold in ternary mixtures. The simultaneous determination of Zn(II) is accompanied by a Δcr value of up to 30 - 50% and cannot be recommended under the given experimental conditions.

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