A digital image analysis method for quantification of sulfite in beverages

Benedetti, Luzia Pires dos Santos; Santos, Vagner Bezerra dos; Silva, Tiago; Benedetti-Filho, Edemar; Martins, Valdomiro Lacerda; Fatibello‐Filho, Orlando

doi:10.1039/c5ay01372k

Cited by 38 publications

(5 citation statements)

References 31 publications

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“…The images were converted to CMYK or grayscale format using the Corel PHOTO-PAINT X7 software, by selecting the relevant image area and calculating the average color intensity. All mPADs were photographed inside a black box mounted with four internal white LEDs, as previously described [35]. Briefly, the system consisted of a black plastic box with an aperture at its top, wherein the digital camera lens was positioned.…”

Section: Instrumentationmentioning

confidence: 99%

A simple method to produce 2D and 3D microfluidic paper-based analytical devices for clinical analysis

Oliveira

Camargo

Pesquero

et al. 2017

Analytica Chimica Acta

112

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This paper describes the fabrication of 2D and 3D microfluidic paper-based analytical devices (μPADs) for monitoring glucose, total protein, and nitrite in blood serum and artificial urine. A new method of cutting and sealing filter paper to construct μPADs was demonstrated. Using an inexpensive home cutter printer soft cellulose-based filter paper was easily and precisely cut to produce pattern hydrophilic microchannels. 2D and 3D μPADs were designed with three detection zones each for the colorimetric detection of the analytes. A small volume of samples was added to the μPADs, which was photographed after 15 min using a digital camera. Both μPADs presented an excellent analytical performance for all analytes. The 2D device was applied in artificial urine samples and reached limits of detection (LODs) of 0.54 mM, 5.19 μM, and 2.34 μM for glucose, protein, and nitrite, respectively. The corresponding LODs of the 3D device applied for detecting the same analytes in artificial blood serum were 0.44 mM, 1.26 μM, and 4.35 μM.

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Section: Instrumentationmentioning

confidence: 99%

A simple method to produce 2D and 3D microfluidic paper-based analytical devices for clinical analysis

Oliveira

Camargo

Pesquero

et al. 2017

Analytica Chimica Acta

112

View full text Add to dashboard Cite

show abstract

“…In this equation, the I term means to R, G, or B value of the studied dye, and the Io term also means to R, G, or B value of the used blank solution. The obtained S was used to construct a calibration curve of the analyzed dye in an aqueous solution [33,35,36]. To detect the best channel for obtaining greater analytical sensitivity, univariate calibration curves were constructed from the calculated signals of R, G, or B values.…”

Section: Figures Of Meritmentioning

confidence: 99%

Smartphones app as portable colorimetric sensor for low-cost quantification of safranin dye in aqueous solutions

Sami Khalid,

Adil Fakhre

2023

Bull. Chem. Soc. Eth.

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ABSTRACT. An android smartphone-based digital image colorimeter was proposed as a novel, fast, cheap, and portable colorimetric sensor for quantification of safranin in aqueous solutions via built-in-house light-boxes photography. Smartphone application known as RGB color detector app that uses an image-matching algorithm via using of take photo (TP) and live camera (LC) to analyze colorful solutions. The color values including red (R), green (G), and blue (B) parameters can be measured with the aid of the app and used for quantifying colorful solutions. The influence of various experimental factors has been optimized. Under optimal conditions, analytical curves were 1.0-10.0 and 2.0-30.0 µg/mL of safranin using G and B parameters, respectively. The obtained signal via the G channel also presented greater sensitivity and linearity, therefore preferred to be the best working channel. The obtained linear range, correlation coefficient, limit of detection, and limit of quantification were 1.00-10.00 µg/mL, 0.9889, 0.15 µg/mL, and 0.51 µg/mL via the GTP-25 method, and 1.00-10.00 µg/mL, 0.9961, 0.13 µg/mL, and 0.44 µg/mL via GLC-25 method, respectively. The proposed method was successfully applied for evaluation of the dye removal. Results were in good agreement with those recorded by UV-Visible spectrophotometer/reference method. KEY WORDS: Smartphone, App, Portable, Colorimetric, Sensor, Safranin Bull. Chem. Soc. Ethiop. 2023, 37(5), 1065-1080. DOI: https://dx.doi.org/10.4314/bcse.v37i5.1

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“…Due to the importance of sulfite incorporation in many applications, different techniques were reported to detect the sulfites, depending on their reducing characteristics; these methods include ion chromatography, 21 colorimetric, 22 electrometric, 23,24 liquid chromatographic method approved by the U.S. food and drug authority (FDA), 25 and several other methods. 26,27 Despite the numerous reported methods for the determination of sulfites, their detection is still challenging because the reported methods may be expensive, time-consuming, need expert analysts, not suitable for routine analysis, insensitive, and/or need sophisticated instruments.…”

Section: Introductionmentioning

confidence: 99%

Ionophore-modified polyaniline-based optode for the determination of hydrogen sulfite levels in beverages, wastewater, and soil

Algethami,

Koraim,

Abdelrahman

et al. 2023

Anal. Methods

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A digital image analysis method for quantification of sulfite in beverages

Abstract: A combination of a spot-test and digital image analysis for determination of sulfite in beverages by reduction of a Fe(iii) complex.

Cited by 38 publications

References 31 publications

A simple method to produce 2D and 3D microfluidic paper-based analytical devices for clinical analysis

A simple method to produce 2D and 3D microfluidic paper-based analytical devices for clinical analysis

Smartphones app as portable colorimetric sensor for low-cost quantification of safranin dye in aqueous solutions

Ionophore-modified polyaniline-based optode for the determination of hydrogen sulfite levels in beverages, wastewater, and soil

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