The methylene blue‐D‐glucose‐O2 system. Oxidation of D‐glucose by methylene blue in the presence and the absence of oxygen

Adamčíková, Ľubica; Pavlíková, Katarína; Ševčı́k, Peter

doi:10.1002/(sici)1097-4601(1999)31:6<463::aid-kin8>3.3.co;2-u

Cited by 14 publications

(24 citation statements)

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“…Because of that reversible equilibrium between the reduced and oxidized forms, MB is a compound useful as redox indicator [3,[5][6][7]. Its main uses are related with the determination of glucose, O 2 [5,8] or ascorbic acid [7] among others. The UV spectrum of MB has been widely studied [9,10] in order to fully understand its chemical behavior.…”

Section: Introductionmentioning

confidence: 99%

On the “concentration-driven” methylene blue dimerization

Tafulo

Queirós

Aguilar

2009

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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In this work a theoretical and experimental analysis of the spectrum of methylene blue is made in order to clarify the nature of the shoulder appearing at approximately 620 nm. This shoulder has been several times attributed to the existence of an hypothetical methylene blue dimer. The results here obtained do not agree with the existence of such a dimeric specie, and point out differences in the ionic strength of the solution as the phenomenon responsible for the variations observed in these spectra.

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Section: Introductionmentioning

confidence: 99%

On the “concentration-driven” methylene blue dimerization

Tafulo

Queirós

Aguilar

2009

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…In the absence of O 2, methylene blue exists in its colourless reduced form (leuco‐methylene blue, λ max = 256 nm) by glucose in NaOH solution, but in the presence of oxygen, the dye is oxidised to highly coloured form (MB, λ max = 665 nm), indicating oxygen in the package (Obata, ; Mills et al ., ). These processes can be described according to the following equations (Adamčíková et al ., ):

Glu + {OH}^{-} \leftrightarrow {Glu}^{-} + H_{2} O

MB + {Glu}^{-} \to X^{-} + LMB

O_{2} + 4 LMB \to 4 MB + 2 H_{2} O

where Glu is glucose, X − is the oxidation products from glucose, MB and LMB represent the oxidised and the reduced form of methylene blue, respectively. However, the traditional oxygen indicators have a serious drawback: they must be prepared, packaged and stored under anaerobic conditions because they react even to air with a high level (21%) of oxygen and stop working in a few hours owing to the exhaustion of the reducing agent (Smolander et al ., ; Lee et al ., ; Mills, ; Pereira de Abreu et al ., ).…”

Section: Introductionmentioning

confidence: 99%

New pressure‐activated compartmented oxygen indicator for intelligent food packaging

Jang

Won

2013

Int J of Food Sci Tech

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“…Pons et al [2,3] presented detailed experiments on the resulting patterns and time and length scales, and provided compelling evidence for the above instability mechanism. The reaction itself is well known [4][5][6] and its chemistry can be described using just two chemical equations [2] as a robust approximation to the full but complicated system [7]. Bees et al [8] formulated a minimal model of the hydrodynamic system and explored the linear stability of steady-state and pseudosteady-state (PSS) profiles.…”

Section: Introductionmentioning

confidence: 99%

Chemoconvection patterns in the methylene-blue–glucose system: Weakly nonlinear analysis

2004

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The oxidation of solutions of glucose with methylene-blue as a catalyst in basic media can induce hydrodynamic overturning instabilities, termed chemoconvection in recognition of their similarity to convective instabilities. The phenomenon is due to gluconic acid, the marginally dense product of the reaction, which gradually builds an unstable density profile. Experiments indicate that dominant pattern wavenumbers initially increase before gradually decreasing or can even oscillate for long times. Here, we perform a weakly nonlinear analysis for an established model of the system with simple kinetics, and show that the resulting amplitude equation is analogous to that obtained in convection with insulating walls. We show that the amplitude description predicts that dominant pattern wavenumbers should decrease in the long term, but does not reproduce the aforementioned increasing wavenumber behavior in the initial stages of pattern development. We hypothesize that this is due to horizontally homogeneous steady states not being attained before pattern onset. We show that the behavior can be explained using a combination of pseudo-steady-state linear and steady-state weakly nonlinear theories. The results obtained are in qualitative agreement with the analysis of experiments.

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The methylene blue‐D‐glucose‐O2 system. Oxidation of D‐glucose by methylene blue in the presence and the absence of oxygen

Cited by 14 publications

References 0 publications

On the “concentration-driven” methylene blue dimerization

On the “concentration-driven” methylene blue dimerization

New pressure‐activated compartmented oxygen indicator for intelligent food packaging

Chemoconvection patterns in the methylene-blue–glucose system: Weakly nonlinear analysis

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