Simultaneous determination of cysteamine and folic acid in pharmaceutical and biological samples using modified multiwall carbon nanotube paste electrode

Taherkhani, Ali; Karimi-Maleh, Hassan; Ensafi, Ali A.; Beitollahi, Hadi; Hosseini, A; Khalilzadeh, Mohammad A.; Bagheri, Hasan

doi:10.1016/j.cclet.2011.10.023

Cited by 60 publications

(13 citation statements)

References 9 publications

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“…The development of various analytical methods for the determination of FA has been reported, including high-performance liquid chromatography (HPLC) 5 , electrochemical techniques such as cyclic voltammetry 6 , UV-VIS spectroscopy 7 , fluorescence 8 , and surface enhanced Raman scattering 9 . A large number of platforms for FA determination have been developed, including i) carbon paste electrodes modified with gold nanoparticles 10 , (ii) hybrid structures based on reduced graphene oxide and silver nanoparticles 11 , (iii) single-wall carbon nanotubes functionalized with ionic liquids and multiwall carbon nanotube paste electrodes 12,13 ; (iv) graphene/ZnO nanowire arrays 14 ; (v) magnetic nanocomposites based on Fe 3 O 4 – ZnS: Mn 2+ /SiO 2 -NH 2 15 , MoS 2 /reduced graphene oxide 16 and (vi) phosphomolybdic acid-polypyrrole/graphene composites 17 . Various strategies have been applied for the simultaneous determination of FA and the following chemical compounds of interest in the medical field: (i) epinephrine and uric acid 18 , (ii) tryptophan, L-cysteine and acetaminophen 19 and (iii) ascorbic acid, dopamine and uric acid 20 .…”

Section: Introductionmentioning

confidence: 99%

Optical properties of folic acid in phosphate buffer solutions: the influence of pH and UV irradiation on the UV-VIS absorption spectra and photoluminescence

Baibarac

Smaranda

Nila

et al. 2019

Sci Rep

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Using UV-VIS absorption spectroscopy, photoluminescence (PL) and photoluminescence excitation (PLE), the photodegradation reactions of folic acid (FA) in phosphate buffer (PB) solutions were studied. Regardless of the PB solution’s pH, the UV-VIS spectra showed a gradual decrease in absorbance at 284 nm simultaneous with an increase in the absorbance of another band in the spectral range of 320–380 nm, which was downshifted under UV irradiation. The relative intensity of the FA PL band, situated in the spectral range 375–600 nm, was dependent on the pH of the PB solution. The FA PL intensity increased as increasing UV irradiation time up to 281 min. in PB solutions with pH values of 6.4 and 5.4. Under an emission wavelength of 500 nm, the position of the FA PLE spectrum changed as the PB solution pH varied from 7 to 5.4 and the irradiation time increased to 317 min. These changes were correlated with the formation of two photodegradation products, namely, pterine-6-carboxylic acid and p-amino-benzoyl-L-glutamic acid. According to UV-VIS spectroscopy and PL and PLE studies, the presence of various excipients in commercial pharmaceutical tablets does not affect the photodegradation of FA in PB solutions. Using IR spectroscopy, new evidences for the formation of the two photodegradation products of FA in PB solutions are shown.

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Section: Introductionmentioning

confidence: 99%

Optical properties of folic acid in phosphate buffer solutions: the influence of pH and UV irradiation on the UV-VIS absorption spectra and photoluminescence

Baibarac

Smaranda

Nila

et al. 2019

Sci Rep

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“…Analytical methods for folic acid include bioassays [4], enzymatic methods [5], fluorimetry [6][7][8][9][10][11][12][13], spectrophotometry [14][15][16], chromatography [17][18][19][20][21][22][23][24][25], chemiluminescence [26][27][28], phosphorimetry [29] and inductively coupled plasmaatomic emission spectroscopy [30]. Electrochemical methods have been used to detect folic acid [31][32][33][34][35][36][37][38][39][40][41][42] and to investigate its redox properties [43]. Cathodic adsorptive stripping voltammetry has been used previously to detect low levels of folic acid in different electrolytes and electrodes [44 -51].…”

Section: Introductionmentioning

confidence: 99%

Folic acid Determination in neutral pH electrolyte by Adsorptive Stripping Voltammetry at the Mercury Film Electrode

Farias¹

2012

iosrphr

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A stripping method for the determination of folic acid at the submicromolar concentration levels is described. The method is based on controlled adsorptive accumulation of folic acid at the hanging mercury drop electrode followed by differential pulse measurement of the adsorbate. The adsorptive stripping response was evaluated with respect to concentration dependence, accumulation time, accumulation potential, scan-rate, size of the mercury drop, pH, ionic strength, presence of possible interferences and other variables. Cyclic voltammograms at pH 7.1(0.2 mol.L -1 KH 2 PO 4 / NaOH buffer solution) showed four cathodic peaks at -0.57, -0.75, -1.18 and -1.39 V. The second peak, (at -0.75 mV), was the most useful for analytical purposes (more sensitive, quasi reversible and well defined) and it was used for quantifying folic acid by differential pulse adsorptive stripping voltammetry in four types of pharmaceutical multivitamin preparations. Sequential determination of folic acid with ascorbic acid is also possible. The results obtained in analysing medicines having folic acid as active constituent were compared favourably with those obtained by HPLC with UV detection. The average content of folic acid found in these medicines by HPLC was 4.81±0.09mg and by voltammetry, 4.87±0.09mg. The proposed method is very simple, efficient and does not involve time-consuming separation steps.

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“…Zhang et al 2012), gold electrode (Hua et al 2011), and carbon paste electrodes (Mokhtari et al 2012;Yang et al 2012). Researchers have reported some papers about multiwalled carbon nanotube ELECTROCHEMICAL SENSOR FOR BISPHENOL A 997 paste electrodes without modified MIPs Keyvanfard et al 2013;Taherkhani et al 2012;K. Zhang et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Determination of Bisphenol A Using an Electrochemical Sensor Based on a Molecularly Imprinted Polymer-Modified Multiwalled Carbon Nanotube Paste Electrode

et al. 2014

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A novel electrochemical sensor for bisphenol A was developed through the combination of a molecular imprinting technique with a multiwalled carbon nanotube paste electrode. A molecularly imprinted polymer and nonimprinted polymer were synthesized in the presence and absence of bisphenol A, and then used to prepare the electrode. The bisphenol A imprinted polymer was applied as a selective recognition element in the electrochemical sensor. Differential pulse voltammetry was used to characterize the electrochemical behavior of bisphenol A at the modified electrodes. The results showed that the imprinted sensor had highest response for bisphenol A. Parameters including the carbon paste composition, pH, and adsorption time for the imprinted sensor were optimized. Under the optimized conditions, the differential pulse voltammetry peak current was linear with the concentration of bisphenol A from 0.08 to 100.0 lM, with a detection limit of 0.022 lM. The imprinted sensor for bisphenol A exhibited good selectivity, stability, and reproducibility. This sensor was successfully used for the determination of bisphenol A in real water samples.

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Simultaneous determination of cysteamine and folic acid in pharmaceutical and biological samples using modified multiwall carbon nanotube paste electrode

Cited by 60 publications

References 9 publications

Optical properties of folic acid in phosphate buffer solutions: the influence of pH and UV irradiation on the UV-VIS absorption spectra and photoluminescence

Optical properties of folic acid in phosphate buffer solutions: the influence of pH and UV irradiation on the UV-VIS absorption spectra and photoluminescence

Folic acid Determination in neutral pH electrolyte by Adsorptive Stripping Voltammetry at the Mercury Film Electrode

Determination of Bisphenol A Using an Electrochemical Sensor Based on a Molecularly Imprinted Polymer-Modified Multiwalled Carbon Nanotube Paste Electrode

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