Exchange reactions control for selective separation of glyoxylic acid in technological mixtures of glyoxal oxidation

Pozdniakov, Maxim A.; Rubtsov, K. V.; Ботвин, В. В.; Sorvanov, Alexander A.; Knyazev, A. S.; Filimoshkin, A. G.

doi:10.1080/01496395.2016.1269129

Cited by 7 publications

(3 citation statements)

References 2 publications

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“…Test procedure was described in the experimental work section. Figure (3) shows an increase of optical absorbance up to 5 mL sulphuric acid addition. Which means that sufficient amount of concentrated sulphuric acid must be present in order to absorb reaction-and hydration water.…”

Section: Influence Of Concentrated Sulphuric Acidmentioning

confidence: 97%

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A Simple Spectrophotometric Method for Determination of Glyoxylic Acid in Its Synthesis Mixture

Abdulwahed

Mamoly²,

Bosnalı³

2020

Preprint

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A submitted manuscript to International Journal of Analytical Chemistry:<div><br><div>A new spectrophotometric method is described to determine glyoxylic acid in its synthesis reaction mixture by means of a modified Hopkins-Cole reaction between glyoxylic acid and tryptophan in presence of ferric chloride and concentrated sulfuric acid. The linear range of glyoxylic acid concentration is 0 - 0.028 M. The LOD and LOQ are 0.0019 M and 0.00577 M, respectively. The LOD, LOQ, standard deviation, relative standard deviation and recovery ratio of the proposed method are comparable with a selected HPLC reference method. Both methods displayed same precision and credibility. Reaction stoichiometry between tryptophan and glyoxylic acid is assumed to be 2:3. Reaction mechanism has been postulated based on identified molar ratios of reactants. Glyoxal gave a negative test with tryptophan although it is a di-aldehyde. </div></div>

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Section: Influence Of Concentrated Sulphuric Acidmentioning

confidence: 97%

“…Thus, it is expected that glyoxylic acid will be very difficult to determine quantitatively using traditional analytical methods such as acid-base or redox titrations, separation, or precipitation [2,3].…”

mentioning

confidence: 99%

A Simple Spectrophotometric Method for Determination of Glyoxylic Acid in Its Synthesis Mixture

Abdulwahed

Mamoly²,

Bosnalı³

2020

Preprint

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“…e determination of glyoxylic acid in its electrochemical synthesis reaction mixture is a difficult process because this mixture contains carboxylic acids with convergent acidic dissociation constants and other compounds carrying organic groups that can undergo oxidation or reduction such as ethylene glycol, glyoxal, and glycolic acid. us, it is expected that glyoxylic acid will be very difficult to determine quantitatively using traditional analytical methods such as acid-base or redox titrations, separation, or precipitation [2,3].…”

Section: Introductionmentioning

confidence: 99%

A Simple Spectrophotometric Method for Determination of Glyoxylic Acid in Its Synthesis Mixture

Abdulwahed

Mamoly

Bosnalı

2020

International Journal of Analytical Chemistry

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A new simple and reliable spectrophotometric method is described to determine glyoxylic acid in its synthesis reaction mixture containing oxalic acid, glycolic acid, acetic acid, glyoxal, and ethylene glycol by means of a modified Hopkins–Cole reaction between glyoxylic acid and tryptophan in presence of ferric chloride and concentrated sulphuric acid. The linear range of glyoxylic acid concentration is 0–0.028 M. The limits of detection (LOD) and quantitation (LOQ) are 0.0019 M and 0.00577 M, respectively. The LOD, LOQ, standard deviation, relative standard deviation, and recovery ratio of the proposed method are comparable with a selected HPLC reference method. Both methods displayed same precision and credibility. Reaction stoichiometry between tryptophan and glyoxylic acid is assumed to be 2 : 3. Reaction mechanism has been postulated based on identified molar ratios of reactants. Glyoxal gave a negative test with tryptophan although it is a dialdehyde.

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Glyoxylic acid: synthesis, isolation, and crystallization

et al. 2019

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Exchange reactions control for selective separation of glyoxylic acid in technological mixtures of glyoxal oxidation

Cited by 7 publications

References 2 publications

A Simple Spectrophotometric Method for Determination of Glyoxylic Acid in Its Synthesis Mixture

A Simple Spectrophotometric Method for Determination of Glyoxylic Acid in Its Synthesis Mixture

A Simple Spectrophotometric Method for Determination of Glyoxylic Acid in Its Synthesis Mixture

Glyoxylic acid: synthesis, isolation, and crystallization

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