Circular Dichroism Spectroelectrochemical and Voltammetric Studies of Vitamin B2

Liu, Xiaoqiang; Zhu, Yongchun; Cheng, Guangjin; Dong, Shaojun

doi:10.1002/1521-4109(200109)13:13<1071::aid-elan1071>3.0.co;2-r

Cited by 5 publications

(3 citation statements)

References 23 publications

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“…Aqueous solution.-Electrochemistry of riboflavin in aqueous solution has been studied under various conditions of electrodes, electrolytes, pH, and buffer solutions. [58][59][60][61][62] The apparent mechanism for the reduction of vitamin B2 in aqueous solution is a two electron, two proton process, where formal potential is dependent on proton concentration (pH).…”

Section: Vitamin B2 -Riboflavinmentioning

confidence: 99%

Critical Review—Electrochemical Properties of 13 Vitamins: A Critical Review and Assessment

Lovander

Lyon

Parr

et al. 2018

J. Electrochem. Soc.

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Review of the literature on the currently recognized, thirteen vitamins yields an overview of the electrochemical properties that include estimates of the formal potentials at physiological pH and identification of the general classes of redox mechanisms. All vitamins are electroactive and map a range of formal potentials E 0 over a 3 V window. The vitamins are grouped as lipid soluble (vitamins A, D, E, and K) and water soluble (B vitamins and vitamin C). Mechanisms are grouped as single electron transfer agents (B3, B7, B2, C, and D), vitamins that can be both oxidized and reduced (B1, B5, B6, B9, and E), and vitamins that undergo two successive, distinct reductions (B12 and K). Vitamin A voltammetry is uniquely complex. Plot of the formal potentials on a potential axis allows assessment of mechanistic paths to vitamin recycling, antioxidant behavior, pH dependence, electrochemical stability in air, acid, and water, electrochemical instability of vitamin pairs, and cooperative interactions between vitamins in medicine. The potential axis is shown as an effective tool for mapping thermodynamically complex interactions. By modern standards, the US federal government identifies 13 vitamins.3 The water soluble vitamins are vitamin C and the eight B vitamins (B1, B2, B3, B5, B6, B7, B9, B12). The lipid or fat soluble vitamins are A, D, E, and K. The fat soluble vitamins can accumulate in the body whereas the water soluble vitamins do not. There are no current vitamins designated beyond E except for K because materials historically assigned the interposed letter designations either no longer fall under the modern definition of vitamin or several related materials were reclassified. Several vitamins exist in different but related chemical structures.Questions considered in this perspective include whether all vitamins are electroactive; what is the redox potential of the vitamins; what are the kinetics and mechanisms of vitamins on oxidation and reduction; when are vitamins antioxidants; are vitamins stable to water and oxygen; do vitamins interact cooperatively. Although papers are available on the electrochemistry and voltammetry of individual vitamins, no single resource summarizes the electrochemical data for all vitamins. This review compiles and critically assesses the available literature on vitamin voltammetry. The compiled data serve to develop perspective on the electrochemical properties of vitamins and the role of vitamins individually and collectively as electroactive species. This CRES 3 T review assimilates fundamentals of thermodynamics and estimated formal potentials, kinetics, and mechanisms as assessed voltammetrically for individual vitamins to provide perspective on the collective electrochemical properties of the thirteen vitamins. Perspective on vitamin electrochemical properties may contribute to assess yet more complex bioelectrochemical processes. * Electrochemical Society Student Member.* * Electrochemical Society Fellow. z E-mail: johna-leddy@uiowa.eduThe review contains two main sections....

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Section: Vitamin B2 -Riboflavinmentioning

confidence: 99%

Critical Review—Electrochemical Properties of 13 Vitamins: A Critical Review and Assessment

Lovander

Lyon

Parr

et al. 2018

J. Electrochem. Soc.

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“…These studies indicate that the nature of electrode material plays a vital role in achieving the required detection sensitivity and linear range of a given analyte. Chromium doped SnO 2 [16] and nickel doped CeO 2 [17], MnO 2 [18], Manganese (III) Tetraphenylporphyrin [19], ZnO [20], (WO 3 , SnO 2 ) modified carbon paste, and ionic liquid [21], Co 2 + -Y zeolite CPE [22], Bismuth [23], 3-amino-5-mercapto-1, 2, 4-triazole [24], metallosilicate [25] and alkane thiol modified gold electrode [26] were previously reported and these modified electrodes showed higher catalytic activities than the unmodified electrodes [27]. Recently, whole cell-based electrochemical sensors were developed with riboflavin and cytochrome c in which electroactive bacteria was employed as biocatalyst and the sensor exhibits good sensitivity [28,29].…”

Section: Introductionmentioning

confidence: 99%

Binary Metal Oxide Adsorbed Graphene Modified Glassy Carbon Electrode for Detection of Riboflavin

Grace

Thillaiarasi²,

Dharuman

2020

Electroanalysis

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Tungsten oxide (W) decorated titanium oxide (T) adsorbed onto a graphene (Gr) and modified the glassy carbon electrode for the electrochemical quantification of riboflavin (RF) in edible food and pharmaceuticals. For comparison, nanocomposites are formed using graphene oxide (GO), reduced graphene oxide (rGO) and pure graphite (G) sheets to study the electrochemical activities towards riboflavin. The ternary WTGr modified GCE shows the highest electrocatalytic activity due to synergetic interactions between the metal oxide and graphene. The electrochemical observations are supported by the SEM, HRTEM, XRD, UV‐Vis, Zeta potential (ζ) and size data. The sensor shows a wide linear range 20 nM–2.5 μM with a detection limit 25.24 nM and sensitivity (4.249×10−8 A/nM). The fabricated sensor is validated in real samples.

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“…CD spectroelectrochemistry as an experimental technique has been reported before. However, it was mainly used for the study of biomolecules, such as proteins, − vitamins, , and hormones. − In this work, we adapt it for the study of organometallic complexes and show its use as a complementary technique to the more common UV−vis spectro-electrochemical investigations. CD spectra can often be measured on the same samples in the same cuvettes used for UV−vis spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

Circular Dichroism Spectroelectrochemical Investigations on the Fluxional Diamagnetic and Paramagnetic Organometallic Complexes [Mo(His-N_ε-C₂H₄COOCH₃)(2-R-allyl)(CO)₂]ⁿ⁺ (R = H, Me; His = O,N,N_δ-l-Histidinate; n = 0, 1)

2003

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The optical and chiroptical properties of Mo(His-N ε-C2H4COOCH3)(allyl)(CO)2 (1) and Mo(His-N ε-C2H4COOCH3)(2-methylallyl)(CO)2 (2) (His = O,N,N δ-l-histidinate, allyl = η-C3H5) and their one-electron-oxidized derivatives 1 + and 2 + are presented. The trends observed in the UV−vis and CD spectra of 1 and 2 in MeOH and MeCN are related to the ratio between the regioisomers a and b, which differ in the position of the allyl ligand relative to the facially coordinating His ligand. Increase of the ratio in favor of a leads to a bathochromic shift of the MLCT transition in the UV−vis spectra. In addition, an increase in the abundance of isomer a leads to a decrease in intensity of the negative Cotton effect around 320 nm and a simultaneous increase in intensity of the negative Cotton effect around 410 nm. CD and UV−vis spectra of 1 + and 2 + in MeCN were acquired via spectroelectrochemical measurements. The electronic transitions observed in the UV−vis spectrum of 2 + at 335 and 546 nm appear to correspond to the negative Cotton effects observed in the CD spectrum at 345 and 553 nm. Similarly, the electronic transition in the UV−vis spectrum of 1 + at 348 nm appears to be related to the negative Cotton effect at 352 nm. To the best of our knowledge, this is the first CD spectroscopic study on paramagnetic organometallic compounds.

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Circular Dichroism Spectroelectrochemical and Voltammetric Studies of Vitamin B2

Cited by 5 publications

References 23 publications

Critical Review—Electrochemical Properties of 13 Vitamins: A Critical Review and Assessment

Critical Review—Electrochemical Properties of 13 Vitamins: A Critical Review and Assessment

Binary Metal Oxide Adsorbed Graphene Modified Glassy Carbon Electrode for Detection of Riboflavin

Circular Dichroism Spectroelectrochemical Investigations on the Fluxional Diamagnetic and Paramagnetic Organometallic Complexes [Mo(His-N_ε-C₂H₄COOCH₃)(2-R-allyl)(CO)₂]ⁿ⁺ (R = H, Me; His = O,N,N_δ-l-Histidinate; n = 0, 1)

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Circular Dichroism Spectroelectrochemical and Voltammetric Studies of Vitamin B2

Cited by 5 publications

References 23 publications

Critical Review—Electrochemical Properties of 13 Vitamins: A Critical Review and Assessment

Critical Review—Electrochemical Properties of 13 Vitamins: A Critical Review and Assessment

Binary Metal Oxide Adsorbed Graphene Modified Glassy Carbon Electrode for Detection of Riboflavin

Circular Dichroism Spectroelectrochemical Investigations on the Fluxional Diamagnetic and Paramagnetic Organometallic Complexes [Mo(His-Nε-C2H4COOCH3)(2-R-allyl)(CO)2]n+ (R = H, Me; His = O,N,Nδ-l-Histidinate; n = 0, 1)

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Circular Dichroism Spectroelectrochemical Investigations on the Fluxional Diamagnetic and Paramagnetic Organometallic Complexes [Mo(His-N_ε-C₂H₄COOCH₃)(2-R-allyl)(CO)₂]ⁿ⁺ (R = H, Me; His = O,N,N_δ-l-Histidinate; n = 0, 1)