Simultaneous determination of carbaryl and azinphos-methyl in water by first-derivative synchronous spectrofluorimetry

1994 ◽  
Vol 350 (10-11) ◽  
pp. 626-629 ◽  
Author(s):  
J. L. Vilchez-Quero ◽  
Jamal Rohand ◽  
R. Avidad-Casta�eda ◽  
A. Naval�n ◽  
L. F. Capit�n-Vallvey
Keyword(s):  
Simultaneous Determination ◽  
Synchronous Spectrofluorimetry ◽  
First Derivative ◽  
Azinphos Methyl

Simultaneous determination of yohimbine and boldine by first-derivative synchronous spectrofluorimetry

1993 ◽  
Vol 110 (1-3) ◽  
pp. 61-69 ◽  
Author(s):  
Jos� Luis Vilchez ◽  
Gonzalo S�nchez-Palencia ◽  
Ramiro Avidad ◽  
Luis Ferm�n Capit�n-Vallvey ◽  
Alberto Naval�n
Keyword(s):  
Simultaneous Determination ◽  
Synchronous Spectrofluorimetry ◽  
First Derivative

Simultaneous Determination of Lomefloxacin and Ciprofloxacin in Dairy Products by First-Derivative Synchronous Spectrofluorimetry

2013 ◽  
Vol 643 ◽  
pp. 43-46
Author(s):  
Yang Wang ◽  
Tian Tian ◽  
Lu Wang ◽  
Xiao Ya Hu
Keyword(s):  
Simultaneous Determination ◽  
Fluorescence Intensity ◽  
Dairy Products ◽  
Fluorescent Intensity ◽  
Zero Crossing ◽  
Synchronous Spectrofluorimetry ◽  
Milk Samples ◽  
First Derivative ◽  
Experimental Parameters

A simple, sensitive and quick assay to simultaneously determine lomefloxacin (LFLX) and ciprofloxacin (CPLX) had been developed by using zero-crossing first derivative constant wavelength synchronous spectrofluorimetry. Due to their similar molecule structures, it was difficult to analysis and determine LFLX and CPLX simultaneously by conventional fluorometry. In order to improve the sensitivity, aluminium ion was used to significantly enhance their endogenous fluorescent intensity. The different experimental parameters affecting the synchronous fluorescence intensity of the two fluoroquinolone drugs were carefully studied and optimized. The proposed method was successfully applied for the determination of the two drugs in milk samples.

Simultaneous Determination of Labetalol and Furosemide by First-Derivative Synchronous Spectrofluorimetry

2009 ◽  
Vol 19 (5) ◽  
pp. 817-828 ◽  
Author(s):  
D. R. El-Wasseef ◽  
D. T. El-Sherbiny ◽  
M. A. Abu-El-Enein ◽  
S. M. El-Ashry
Keyword(s):  
Simultaneous Determination ◽  
Synchronous Spectrofluorimetry ◽  
First Derivative

Simultaneous determination of molybdenum and tungsten by first-derivative synchronous spectrofluorimetry

The Analyst ◽  
1989 ◽  
Vol 114 (10) ◽  
pp. 1297-1301 ◽  
Author(s):  
Francisco Salinas ◽  
Arsenio Muñoz de la Peña ◽  
Luis F. Capitan-Vallvey ◽  
Alberto Navalon
Keyword(s):  
Simultaneous Determination ◽  
Synchronous Spectrofluorimetry ◽  
First Derivative ◽  
And Tungsten

scholarly journals Three Different Spectrophotometric Methods for Simultaneous Determination of Pyriproxyfen and Chlorothalonil Residues in Cucumber and Cabbage Samples

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Shilan A. Omer ◽  
Nabil A. Fakhre
Keyword(s):  
Simultaneous Determination ◽  
Simultaneous Estimation ◽  
Zero Crossing ◽  
Spectrophotometric Methods ◽  
First Derivative ◽  
The Third ◽  
Mean Centering ◽  
Relative Standard ◽  
One Way Anova

In this study, three simple and accurate spectrophotometric methods for simultaneous determination of pyriproxyfen and chlorothalonil residues in cucumbers and cabbages grown in experimental greenhouse were studied. The first method was based on the zero-crossing technique measurement for first and second derivative spectrophotometry. The second method was based on the first derivative of the ratio spectra. However, the third method was based on mean centering of ratio spectra. These procedures lack any previous separation steps. The calibration curves for three spectrophotometric methods are linear in the concentration range of 1–30 μg·mL−1 and 0.5–7 μg·mL−1 for pyriproxyfen and chlorothalonil successively. The recoveries ranged from 82.12–97.40% for pyriproxyfen and 81.51–97.04% for chlorothalonil with relative standard deviations less than 4.95% and 5.45% in all instances for pyriproxyfen and chlorothalonil, respectively. The results obtained from the proposed methods were compared statistically by using one-way ANOVA, and the results revealed there were no significant differences between ratio spectra and mean centering methods with the zero-crossing technique. The proposed methods are successfully applied for the simultaneous estimation of the residue of both pesticides in cucumber and cabbage samples.

scholarly journals Simultaneous Determination of Amlodipine and Valsartan

2011 ◽  
Vol 6 ◽  
pp. ACI.S7282 ◽  
Author(s):  
Nashwah Gadallah Mohamed
Keyword(s):  
Absorption Spectrum ◽  
Simultaneous Determination ◽  
Zero Order ◽  
Uv Spectrophotometry ◽  
Ratio Spectrum ◽  
First Derivative ◽  
Bulk Powder ◽  
Overlapped Peaks ◽  
Third Derivative

A spectrophotometric method was developed for simultaneous determination of amlodipine (Aml) and valsartan (Val) without previous separation. In this method amlodipine in methanolic solution was determined using zero order UV spectrophotometry by measuring its absorbency at 360.5 nm without any interference from valsartan. Valsartan spectrum in zero order is totally overlapped with that of amlodipine. First, second and third derivative could not resolve the overlapped peaks. The first derivative of the ratio spectra technique was applied for the measurement of valsartan. The ratio spectrum was obtained by dividing the absorption spectrum of the mixture by that of amlodipine, so that the concentration of valsartan could be determined from the first derivative of the ratio spectrum at 290 nm. Quantification limits of amlodipine and valsartan were 10-80 μg/ml and 20-180 μg/ml respectively. The method was successfully applied for the quantitative determination of both drugs in bulk powder and pharmaceutical formulation.

Micellar‐Emphasised simultaneous determination of ivabradine hydrochloride and felodipine using synchronous spectrofluorimetry

Luminescence ◽  
2022 ◽  
Author(s):  
Eman Yosrey ◽  
Heba Elmansi ◽  
Zeinab A. Sheribah ◽  
Mohamed El‐Sayed Metwally
Keyword(s):  
Simultaneous Determination ◽  
Synchronous Spectrofluorimetry
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