Simultaneous spectrophotometric determination of binary mixtures of surfactants using continuous wavelet transformation

Afkhami, Abbas; Nematollahi, Davood; Madrakian, Tayyebeh; Tarighat, Maryam Abbasi; Hajihadi, Mitra

doi:10.1016/j.jhazmat.2008.11.118

Cited by 16 publications

(5 citation statements)

References 33 publications

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“…It is similar to fourier transform with the advantage of having many basic functions called wavelets while the basic functions in fourier transform are the trigonometric functions (sine and cosine). Continuous wavelet transform (CWT) has been used over the past decade in many areas like de-noising, smoothing, data compression and quantitative analysis of multicomponent systems [52][53][54] . Due to the presence of a large number of basic wavelets, wavelet transform provides a solution for almost all chemistry problems with one or more of its wavelets by choosing the suitable scaling parameter.…”

Section: Continuous Wavelet Transform (Cwt)mentioning

confidence: 99%

Recent Development in Ultraviolet Spectrophotometry Through the Last Decade (2006–2016): A Review

Lotfy

Saleh

2016

Int J Pharm Pharm Sci

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<p>Several techniques have been proposed for treatment of spectrophotometric data, with the objective of extracting the largest amount of analytical information from spectra composed of unresolved bands. The instrumental development and analytical applications of UV regions absorption spectrophotometry produced in the last 10 y (since 2006) are reviewed. The methods were classified according to the spectra data used, including zero order absorption, derivative and ratio amplitudes. The proposed methods were applied to solve different complex pharmaceutical mixtures and the obtained results were accepted when compared to other reported methods. </p>

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Section: Continuous Wavelet Transform (Cwt)mentioning

confidence: 99%

Recent Development in Ultraviolet Spectrophotometry Through the Last Decade (2006–2016): A Review

Lotfy

Saleh

2016

Int J Pharm Pharm Sci

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“…The compression of spectral data could be realized by eliminating high-frequency wavelet coefficients and retaining lowfrequency wavelet coefficients [9][10][11] . The schematic diagram of Matlat decomposition algorithm is shown in Fig.2 [11] , where H and G are low-pass filter and high-pass filter respectively, A J and D J are the low-frequency wavelet coefficient and highfrequency wavelet coefficient respectively, and 2 represents interval dot sampling.…”

Section: Fig2 Schematic Diagram Of Matlat Decomposition Algorithmmentioning

confidence: 99%

Simultaneous determination of brilliant blue and indigotine by derivative fluorescence spectrometry combined with WT-RBFNN

Gao

Chen

et al. 2011

Optoelectron. Lett.

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The mixed solutions of brilliant blue and indigotine are prepared and the fluorescence spectra of them are experimentally measured. The serious overlapping spectra of brilliant blue and indigotine are solved by means of the first-derivative fluorescence spectrometry. The wavelet coefficients, obtained by compressing the spectral data using wavelet transformation (WT), are taken as inputs to establish the radial basis function neural network (RBFNN). The neural network model can realize simultaneous determination of brilliant blue and indigotine, and the mean relative errors of both compounds are 1.84% and 1.26% , respectively. Synthetic food dyes are extensively used in food processing to improve the sensory quality of food products [1] . However, the raw material of synthetic food dyes is mostly coal tar, and synthetic food dyes may be degraded into carcinogens by azo reductases in human body [2] . Therefore, it is necessary to determine the synthetic food dyes accurately in food safety supervision.In our previous work, a single synthetic food dye, such as Ponceau 4R [3] and Amaranth [4] , can be determined using conventional fluorescence spectrometry. But in practice, synthetic food dyes are often mixedly used to get an ideal color. Due to the probable overlapping of fluorescence spectra of different dyes, the conventional fluorescence spectrometry is not accurate enough to simultaneously determine the multicomponent dyes.In this paper, brilliant blue and indigotine, which have serious overlapping fluorescence spectra, are chosen as experimental subjects. And the derivative fluorescence spectrometry is introduced to solve the overlapping spectra. Finally, combined with WT and RBFNN, a prediction model is established to determine these two dyes simultaneously.The samples are brilliant blue and indigotine standard solutions, each 1 mg/ml, provided by the National Research Center for Certified Reference Materials. We use ultrapure water to dilute the standard solutions and prepare 24 different concentrations of mixed solutions with a range of 0-20 g/ml for both brilliant blue and indigotine. The spectra of mixed solutions are measured on SP-2558 multi-function spectral measurement system, the excitation wavelength is 300 nm, and the range of emission wavelength is from 350 nm to 800 nm.We take 5 g/ml brilliant blue solution, 5 g/ml indigotine solution and the mixed solution with a concentration of 5 g/ ml brilliant blue and 5 g/ml indigotine for instance, and the fluorescence spectra of them are shown in Fig.1. It is obvious that the spectra of these solutions overlap severely, among which the fluorescence peaks of brilliant blue are located at 444 nm and 665 nm, while those of indigotine are located at 416 nm and 678 nm. And it is apparent that the spectrum of the mixed solution is not a simple superposition of the spectra of brilliant blue and indigotine, due to the competition between them. Meanwhile we can see that the brilliant blue has an edge in fluorescence competition, which causes the similarity between ...

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“…4,5 Some applications of the CWT to the quantitative analysis of mixtures were reported. [6][7][8] The CAN-HCT combination in tablets has been used for the treatment of high blood pressure (hypertension). CAN and HCT provided in one tablet are the angiotensin II receptor blocker and the diuretic, respectively.…”

Section: Introduction *mentioning

confidence: 99%

Continuous wavelet transform approach for the assay of active components in tablets

ÜSTÜNDAĞ,

DINÇ

2022

Rev.Roum.Chim.

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Two continuous wavelets transform (CWT) methods were developed for the simultaneous determination of candesartan cilexetil (CAN) and hydrochlorothiazide (HCT) in tablets. The CWT methods were applied to the ratio spectra (RS) of the CAN and HCT. The CWT approaches based on the application of Haar and Mexican hat function (RS-HAAR-CWT and RS-MEXH-CWT, respectively) to the transformation of the ratio spectra were found to be suitable to reach a good spectral quantification. In the use of transformed ratio spectra, the calibration graphs for CAN and HCT were computed by using the RS-CWT-amplitudes at 244.5 and 264.5 nm in RS-HAAR-CWT spectra and at 255.6 and 250.0 nm in RS-MEXH-CWT spectra, respectively. The LOD and LOQ values for RS-HAAR-CWT and RS-MEXH-CWT were 0.39 - 0.58 and 0.43 - 0.33, 1.28 - 1.92 and 1.44 - 1.10 for CAN and HCT, respectively. The recovery results obtained by applying RS-HAAR-CWT and RS-MEXH-CWT calibrations to the artificial mixtures were found between 99.3 and 103.5% and obtained RSD values were found between 1.38 and 2.42. The validity and applicability of the CWT methods was performed by using the recovery study, standard addition technique and intra-day and inter-day tests. The proposed methods were successfully applied to the analysis of the CAN- HCT tablets.

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Simultaneous spectrophotometric determination of binary mixtures of surfactants using continuous wavelet transformation

Cited by 16 publications

References 33 publications

Recent Development in Ultraviolet Spectrophotometry Through the Last Decade (2006–2016): A Review

Recent Development in Ultraviolet Spectrophotometry Through the Last Decade (2006–2016): A Review

Simultaneous determination of brilliant blue and indigotine by derivative fluorescence spectrometry combined with WT-RBFNN

Continuous wavelet transform approach for the assay of active components in tablets

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