Biocatalytic approaches for synthesis of conducting polyaniline nanoparticles

Cholli, Ashok L.; Thiyagarajan, Muthiah; Kumar, Jayant; Parmar, Virinder S.

doi:10.1351/pac200577010339

Cited by 24 publications

(14 citation statements)

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“…66 Previously, the peak at ≈129 ppm was tentatively assigned to the C-8 quinoid carbons of protonated PANI. 13,64,68 This peak is absent in the solution spectrum of the emeraldine base, 62 but it has been observed in the 13 C NMR spectrum of PANI synthesized with peroxidase/H 2 O 2 in the presence of SDBS micelles, 16 similarly to what we found (Figure 13b).…”

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confidence: 81%

Vesicles as Soft Templates for the Enzymatic Polymerization of Aniline

et al. 2009

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The feasibility of using surfactant vesicles as soft templates for the peroxidase-triggered polymerization of aniline was investigated. It was found that mixed anionic vesicles (diameter approximately 80 nm) composed of sodium dodecylbenzenesulfonate (SDBS) and decanoic acid (1:1, molar ratio) are promising templates. In the presence of the vesicles and horseradish peroxidase/hydrogen peroxide (H2O2) as initiator system, aniline polymerizes under optimized conditions at pH=4.3 to the desired conductive emeraldine form of polyaniline (PANI). The optimal polymerization conditions were elaborated, and some of the chemical and physicochemical aspects of the reaction system were investigated. After addition of aniline and peroxidase to the vesicles, aniline is only loosely associated with the vesicles, as shown by NOESY-NMR and zeta potential measurements. In contrast, the peroxidase strongly binds to the vesicle surface, as shown by fluorescence measurements using TNS (2-(p-toluidino)naphthalene-6-sulfonate) as vesicle membrane probe. This binding of the enzyme to the vesicle surface indicates that the polymerization reaction is initiated predominantly on the surface of the vesicles. Cryo-transmission electron microscopy indicates that the polymerization product remains associated with the vesicles on their surface. For short reaction times (30 s

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confidence: 81%

Vesicles as Soft Templates for the Enzymatic Polymerization of Aniline

et al. 2009

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“…Oxidative polymerization of 2-naphthol using cyclodextrins as carrier resulted in a polymer with fluorescence characteristics of 2-naphthol chromophor [160]. To overcome the problem involved in separating polyaninile produced using a template assisted approach, an enzymatic preparation in polymer colloids [148] and in reverse micellar was produced by Thiyagarajan et al [161] and Cholli et al [162].…”

Section: Reverse Micelles As Important Media For Perfectly Controlledmentioning

confidence: 99%

Engineering Strategies for Successful Development of Functional Polymers Using Oxidative Enzymes

et al. 2012

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Enzyme application in polymer engineering is rapidly increasing and is set to revolutionize many industries. Given the multidisciplinary nature of this field, it has become clear that successful development of functional polymers entails tapping into advances in bioengineering, molecular biology, genetic engineering, chemical engineering, biochemistry, material science, nanotechnology, etc. This review summarizes the different strategies and reaction conditions that can influence the synthesis or modification of polymers. It is hoped that this review will provide scientists from different backgrounds with information on the different reaction engineering strategies for the successful development of functional polymers using oxidative enzymes.

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“…) in slightly acidic aqueous solution may benefit from the presence of nanoscaled macromolecular or polymolecular additives, so‐called ‘templates’. Beneficial templates, which influence (‘guide’) the reaction in a positive way, are either anionic polymers ( e.g., sulfonated polystyrene), anionic micelles ( e.g., from sodium dodecylbenzenesulfonate), or anionic vesicles ( e.g., from sodium bis(2‐ethylhexyl)sulfosuccinate, AOT) . In the presence of such dispersed sub‐micrometer‐sized templates, the products obtained under optimal conditions with an enzyme that can oxidize aniline, are very different from the products obtained under comparable conditions without templates.…”

Section: Introductionmentioning

confidence: 99%

A Novel Role of Vesicles as Templates for the Oxidation and Oligomerization ofp‐Aminodiphenylamine by Cytochromec

Luginbühl

Iwasaki

Varkey

et al. 2017

Helvetica Chimica Acta

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The oxidation and subsequent oligo‐ or polymerization of aniline or the N‐C‐para coupled aniline dimer p‐aminodiphenylamine (N‐phenyl‐1,4‐phenylenediamine) with H2O2‐dependent heme peroxidases in aqueous medium at pH = 4.3 is strongly influenced in a positive way by the presence of anionic polymers, micelles or vesicles as soft ‘templates’ (macromolecular or polymolecular additives), to yield products which resemble the emeraldine salt form of polyaniline (PANI‐ES). The positive effect the templates exert on the reaction mainly originates from interactions between the templates and the monomers, reaction intermediates and products, whereby the reaction occurs localized in the vicinity of the templates, suppressing undesired side reactions. As shown in the present work, the templates may even play an additional role, depending on the type of catalyst. Through interactions between the heme protein cytochrome c and anionic vesicles, cytochrome c gains increased peroxidase activity. In this way, the templates not only serve for hosting the oxidation and oligo‐ or polymerization reactions for obtaining PANI‐ES type products, but also simultaneously activate the catalyst in order to trigger the reaction.

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Biocatalytic approaches for synthesis of conducting polyaniline nanoparticles

Cited by 24 publications

References 0 publications

Vesicles as Soft Templates for the Enzymatic Polymerization of Aniline

Vesicles as Soft Templates for the Enzymatic Polymerization of Aniline

Engineering Strategies for Successful Development of Functional Polymers Using Oxidative Enzymes

A Novel Role of Vesicles as Templates for the Oxidation and Oligomerization ofp‐Aminodiphenylamine by Cytochromec

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