Identification and determination of seven synthetic dyes in foodstuffs and soft drinks on monolithic C18 column by high performance liquid chromatography
“…The presented method in this work showed remarkable advantages such as sharp waves with relatively large peak currents and low backgrounds, which can be conducted to improve the sensitivity and detection limit in analytical determinations. The detection limit compared with other reported works [4, 7, 16, 36] are summarized in Table 1.Fig. 8Calibration plot for the determination of Tz at the PGMCPE in pH 7 PBS with the scan rate 100 mV/s.…”
Section: Resultsmentioning
confidence: 94%
“…The detection limit compared with other reported works [4, 7, 16, 36] are summarized in Table 1.Fig. 8Calibration plot for the determination of Tz at the PGMCPE in pH 7 PBS with the scan rate 100 mV/s.…”
Section: Resultsmentioning
confidence: 94%
“…Few methods proposed for detection and determination of Tz in foods like Stopped-flow kinetic analysis [5], voltammetric analysis [6, 7], visible spectrophotometry [8] thin-layer chromatography [9, 10], capillary electrophoresis [11, 12, 13], superior high-performance liquid chromatography [14, 15, 16, 17, 18] in biological samples. These published methods are known to utilize risky solvents, invest long examination energy, and sometimes it is important to make sample pretreatments.…”
In this paper, a poly (glycine) modified carbon paste electrode (PGMCPE) for sensitive determination of Tartrazine (Tz) was developed. The electrochemical behaviors of Tz at the PGMCPE were investigated by cyclic voltammetry, differential voltammetry and the results showed that the polymer film on electrode exhibited excellent electrocatalytic activity for the electrochemical oxidation of Tz in phosphate buffer solution, pH 7 (PBS). The influencing factors containing a supporting electrolyte, pH of the solution, deposition potential, amount of Tz and scan rate were investigated. The sensor exhibited two linear behavior in the range of 1 × 10−6 to 2.7 × 10−5 mol L−1 and 3.5 × 10−5 to 8.7 × 10−5 mol L−1 for Tz (correlation coefficients: 0.991 and 0.995 respectively) with detection limit (LOD) of 2.83 × 10−7 mol L−1, limit of quantification (LOQ) 9.4 × 10−7 mol L−1 and detection sensitivity (2.0452 μA/μM), for Tz. The results show that the biosensor is sensitive and useful for the determination of Tz.
“…The presented method in this work showed remarkable advantages such as sharp waves with relatively large peak currents and low backgrounds, which can be conducted to improve the sensitivity and detection limit in analytical determinations. The detection limit compared with other reported works [4, 7, 16, 36] are summarized in Table 1.Fig. 8Calibration plot for the determination of Tz at the PGMCPE in pH 7 PBS with the scan rate 100 mV/s.…”
Section: Resultsmentioning
confidence: 94%
“…The detection limit compared with other reported works [4, 7, 16, 36] are summarized in Table 1.Fig. 8Calibration plot for the determination of Tz at the PGMCPE in pH 7 PBS with the scan rate 100 mV/s.…”
Section: Resultsmentioning
confidence: 94%
“…Few methods proposed for detection and determination of Tz in foods like Stopped-flow kinetic analysis [5], voltammetric analysis [6, 7], visible spectrophotometry [8] thin-layer chromatography [9, 10], capillary electrophoresis [11, 12, 13], superior high-performance liquid chromatography [14, 15, 16, 17, 18] in biological samples. These published methods are known to utilize risky solvents, invest long examination energy, and sometimes it is important to make sample pretreatments.…”
In this paper, a poly (glycine) modified carbon paste electrode (PGMCPE) for sensitive determination of Tartrazine (Tz) was developed. The electrochemical behaviors of Tz at the PGMCPE were investigated by cyclic voltammetry, differential voltammetry and the results showed that the polymer film on electrode exhibited excellent electrocatalytic activity for the electrochemical oxidation of Tz in phosphate buffer solution, pH 7 (PBS). The influencing factors containing a supporting electrolyte, pH of the solution, deposition potential, amount of Tz and scan rate were investigated. The sensor exhibited two linear behavior in the range of 1 × 10−6 to 2.7 × 10−5 mol L−1 and 3.5 × 10−5 to 8.7 × 10−5 mol L−1 for Tz (correlation coefficients: 0.991 and 0.995 respectively) with detection limit (LOD) of 2.83 × 10−7 mol L−1, limit of quantification (LOQ) 9.4 × 10−7 mol L−1 and detection sensitivity (2.0452 μA/μM), for Tz. The results show that the biosensor is sensitive and useful for the determination of Tz.
“…Different techniques such as liquid chromatography–mass spectrometry (LC–MS) [11, 12], liquid chromatography–tandem mass spectrometry (LC–MS/MS) [13], gas chromatography–mass spectrometry (GC–MS) [14], capillary electrophoresis [14], high performance liquid chromatography (HPLC) [14, 15], high performance liquid chromatography–mass spectrometry (HPLC–MS) [16] and spectrophotometry [8, 17] have been used for determination of dyes in complex samples. Each of these techniques has disadvantages.…”
This paper describes the application of response surface methodology (RSM) to develop a miniaturized metal organic framework based pipette-tip solid phase extraction for the extraction of malachite green (MG), rhodamine B (RB), methyl orange (MO) and acid red 18 (AR) dyes from seawater samples and their determination by high performance liquid chromatography. The effects of various parameters such as pH of the sample solution, type and amount of added salt, type and volume of eluent solvent, concentration of surfactant (triton X-114), sample volume, and number of cycles of extraction and desorption were investigated and optimized by two methods of one-variable-at-a-time and RSM based on Box–Behnken design. Under optimum conditions, the linear range of the method was 0.5–200.0 µg/L for RB and MG and 1.0–150.0 µg/L for AR and MO. Limits of detection of the analytes were obtained in the range of 0.09–0.38 µg/L. Reproducibility of the method (as RSD %) was better than 6.4%. The method has been successfully used for analysis of four dyes in seawater of Chabahar Bay.
Electronic supplementary material
The online version of this article (10.1186/s13065-019-0572-0) contains supplementary material, which is available to authorized users.
“…The N=N azo group and aromatic ring in the structure of azo dyes make it harmful to human health when adding large amounts of these dyes [3]. New methods are employed for pre-concentration and evaluation of azo dye such as solid-phase extraction (SPE) [4,5], cloud point extraction [6,7], dispersive liquidliquid micro-extraction; as well as estimation techniques for examples differential pulse polarography [8], spectorphotometry [3, 9,10] and chromatographic methods [11][12][13][14]. The CPE method has several advantages such as fast, low cost and safety, therefore, it has employed as one of the evaluation and preconcentration procedures in analytical chemistry.…”
Ponceau 4R(E124) is azo dye that is mostly used in some of food products such as soft drinks, beverages, jelly and ham. A simple and sensitive procedure is established for the determination of ponceau 4R using cloud point extraction (CPE). In order to get the optimum conditions for ponceau 4R extraction, various analytical factors such as pH media, nonionic surfactant TX-114 or Brij-56, cationic surfactant CPC and equilibration temperature was investigated. The linearity of calibration graph was above the range of 0.05-1.7 µg ml-1. The LOD and LOQ using TX-114 were based to be 0.025, 0.075 µg ml-1 whereas for Brij-56 were found as 0.062, 0.187 µg ml-1 respectively. The proposed procedure was successfully employed for ponceau 4R detection in several beverages samples.
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