Spectrophotometric determination of ascorbic acid in grapes with the Prussian Blue reaction

Matei, Nicoleta; Dobrinaș, Simona; Radu, Gabriel Lucian

doi:10.2478/v10310-012-0029-y

Cited by 8 publications

(5 citation statements)

References 18 publications

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“…Figure 1 shows the measurement wavelength of formed Prussian Blue at 750 nm, consistent with the visible light spectrum and complementary blue-green colour at 610-750 nm (Day and Underwood, 2002). This finding is also in accordance with the findings of other studies, which indicate that the optimum measurement wavelength for Prussian blue determination is around 700 nm (Matei et al, 2012;Wasito et al, 2021;Zhai et al, 2012).…”

Section: Spectrophotometric Methods Developmentsupporting

confidence: 93%

Free Chlorine Determination in Disinfectant Product using Visible Spectrophotometry based on Prussian Blue Degradation

2022

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Disinfectant products with excessive chlorine could be dangerous for health and need quality control. It is important to develop an analytical method for monitoring product quality. The main objective of this work is to develop an alternative method and evaluate the analytical performance of visible spectrophotometry for determining free chlorine in disinfectant products based on the Prussian blue decomposition process. The capability of chlorine to oxidize ferrous to ferric ions makes the Prussian blue generated by ferrosulfate and potassium ferricyanide is decomposed and measured by spectrophotometer. The formation of Prussian blue was improved by optimizing some reaction conditions and assessing incubation time. Linearity, analytical concentration range, precision, accuracy, detection limit, and quantitation limit parameters were among the examined analytical parameters. The results showed that the optimum concentration of ferrosulfate, potassium ferysianide, and hydrochloric acid for Prussian blue formation was 2.0 mmol L-1, 3.0 mmol L-1, and 0.5 mol L-1, respectively, with 15 minutes incubation time after chlorine addition. Analytical performance parameters seemed appropriate for routine analysis purposes. The developed method can also be applied as an alternative analytical method to determine the free chlorine concentration of disinfection products in the market.

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Section: Spectrophotometric Methods Developmentsupporting

confidence: 93%

Free Chlorine Determination in Disinfectant Product using Visible Spectrophotometry based on Prussian Blue Degradation

2022

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“…The determinations were done at a wavelength of 700 nm using a UV-VIZ DR 3900 Lange from England spectrometer. The method was optimized in a previous paper [19]. Determination by the voltammetric method is based on the oxidation of ascorbic acid to dehydroascorbic acid.…”

Section: Methodsmentioning

confidence: 99%

Degradation Kinetic Modelling of Ascorbic Acid from Orange Juice

Soceanu

Matei

Dobrinaș

et al. 2020

The 1st International Electronic Conference on Food Science and Functional Foods

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Vitamin C or ascorbic acid is a basic nutrient, a highly effective antioxidant, widely used as food additive. Therefore, quality control in food industry demands ascorbic acid determination methods. The purpose of this study was to determine vitamin C in natural orange juices by spectrometric and voltammetric methods. Another goal was to determine the kinetic and thermodynamics activation parameters for ascorbic acid degradation in orange juices over time and at different temperatures. It was observed that during storage, ascorbic acid concentrations in orange juices were gradually decreased with time at a rate depending on storage temperature and type of orange juice. The reaction order was determined through integrated graphical analysis where the dependences of ln ct/c0 as a function of time reveals the high values for R2, indicating that the kinetics of the degradation of AA follows first order reaction at both studied temperatures. For studied samples the loss of ascorbic acid was varied between 4.33% and 9.13%. Enthalpy variation (ΔH) and entropy variation (ΔS) of activation process were obtained from the Eyring–Polany model based on transition state theory. The values of activation energy ranged between 7289.24 kJmol−1 and 15689.54 kJmol−1.

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“…Prussian blue is a complex that has a relatively low solubility in water, but this can be improved if chloride or fluoride ions are present in the water. For this reason, it was decided to use KCl and HCl solutions as a reaction medium [49].…”

Section: Ascorbic Acid (Asa)mentioning

confidence: 99%

“…Prussian blue is a complex that has a relatively low solubility in water this can be improved if chloride or fluoride ions are present in the water. For this re it was decided to use KCl and HCl solutions as a reaction medium [49]. Prussian blue (Fe4[Fe(CN)6]3) shows an absorption band at 700 nm, used for plo the calibration curve in the concentration range 1-10 mg/L.…”

Section: Ascorbic Acid (Asa)mentioning

confidence: 99%

Spectral Study of Some Metabolites Involved in the Adaptation Reaction of Bitter Cucumber (Momordica charantia) to Saline Stress

Ostaci,

Slabu,

Marta

et al. 2024

Horticulturae

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Momordica charantia (bitter cucumber) is a tropical and subtropical plant with a long history of use in traditional medicine. Salinity is a major problem that limits plant growth and biomass production. The aim of this work was to determine the salinity tolerance of bitter cucumber, through the spectral analyses of some metabolites involved in their response to abiotic stress factors. To carry out the experiment, two varieties of bitter cucumber and three experimental lines were subjected to saline stress by applying treatments with saline solutions in different concentrations (control—0 mM NaCl; V1—100 mM NaCl; and V2—200 mM NaCl). After applying the treatments, analyses were carried out on the amount of free proline (Pro), ascorbic acid, and aromatic amino acids. For proline and ascorbic acid, the tendency was for their concentration to decrease in the variants treated with saline solutions" with "the tendency was for their absorbance to decrease in the variants treated with saline solutions. The differences between the controls and the treated variants, as well as between the studied genotypes, highlight their capacity for resistance and adaptation to saline stress.

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Spectrophotometric determination of ascorbic acid in grapes with the Prussian Blue reaction

Cited by 8 publications

References 18 publications

Free Chlorine Determination in Disinfectant Product using Visible Spectrophotometry based on Prussian Blue Degradation

Free Chlorine Determination in Disinfectant Product using Visible Spectrophotometry based on Prussian Blue Degradation

Degradation Kinetic Modelling of Ascorbic Acid from Orange Juice

Spectral Study of Some Metabolites Involved in the Adaptation Reaction of Bitter Cucumber (Momordica charantia) to Saline Stress

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