Horseradish peroxidase-catalyzed polymerization of ortho-imino-phenol: Synthesis, characterization, thermal stability and electrochemical properties

Topal, Yasemin; Tapan, Senem; Göktürk, Ersen; Şahmetlioğlu, Ertuğrul

doi:10.1016/j.jscs.2017.03.006

Cited by 14 publications

(7 citation statements)

References 26 publications

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“…The C 1s spectra confirmed the presence of CC, CO, C═O, OC═O, and π  π bonds; and the O 1s spectra confirmed the presence of C═O and CO bonds, and a Na KLL Auger peak, which overlaps the O 1s envelope at ≈536 eV. There were no clear trends in the data to determine the connectivity of the polyHGA backbone [ 49 ] (e.g., ratio of ArAr/CC bonds to ArOAr/COC bonds normalized against the peak for OC═O; Tables S1–S5, Supporting Information), and the varying levels of C═O bonds (plausibly due to both carboxylic acids and quinones) are suggestive of differing oxidation states for the monomers incorporated in the backbone of the polyHGAs.…”

Section: Resultsmentioning

confidence: 99%

The Polymerization of Homogentisic Acid In Vitro as a Model for Pyomelanin Formation

Galeb

Lamantia

Robson

et al. 2022

Macro Chemistry & Physics

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Melanins are a class of biopolymers that are widespread in nature, with diverse origins, compositions, and functions, and their chemical and optoelectronic properties render them potentially useful for application in materials science for various biotechnological applications. For patients with alkaptonuria, the accumulation of homogentisic acid (HGA) in their bodies is associated with the concomitant deposition of pyomelanin, which is a pigment that contains significant amounts of polymerized HGA (polyHGA) in the bodily tissues of the patients. The polymerization of HGA under various different conditions in vitro is investigated using a selection of different analytical chemistry techniques to understand if there may be a correlation between the conditions and pigment deposition in vivo, and their potential for application as green/sustainable and components of electronic devices.

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Section: Resultsmentioning

confidence: 99%

The Polymerization of Homogentisic Acid In Vitro as a Model for Pyomelanin Formation

Galeb

Lamantia

Robson

et al. 2022

Macro Chemistry & Physics

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“…At the end of the reaction, the precipitated polymer was centrifuged. The obtained product was washed with water and methanol and dried at 60 C. 36,37 Color of the products were black. The obtained polymers were soluble in dimethylformamide and dimethylsulfoxide, and insoluble in chloroform, tetrahydrofuran, acetone, and dichloromethane.…”

Section: Representative Polymerization Proceduresmentioning

confidence: 99%

Horseradish peroxidase‐based hybrid nanoflowers with enhanced catalytical activities for polymerization reactions of phenol derivatives

Göktürk

Öçsoy

Turaç

et al. 2020

Polymers for Advanced Techs

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Catalytic activity and stability of HRP‐Cu2+ hybrid nanoflowers (hCu‐NFs) in the polymerization reactions of phenol derivatives was investigated. It was observed that the catalytic activity and stability of hybrid nanoflowers on the polymerization of the phenol derivatives was considerably higher compared to free Horseradish peroxidase (HRP) enzyme. The hCu‐NFs effectively polymerized phenolic compounds as a novel nanobiocatalyst and led to polymers having quite high yields, molecular weights, and thermal stabilities compared to free HRP enzyme. The hCu‐NFs provide substantial repeated use and showed some degree of catalytic activity even after fourth cycle experiment in the polymerization reactions.

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“…At the end of the reaction, the precipitated polymer was centrifuged. The obtained product was washed with water and methanol and dried at 60 °C [29,30]. The colors of the obtained products were black.…”

Section: Representative Polymerization Proceduresmentioning

confidence: 99%

Flowerlike hybrid horseradish peroxidase nanobiocatalyst for the polymerization of guaiacol

Göktürk¹

2020

Turk J Chem

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In this study, the catalytic activity and stability of flowerlike hybrid horseradish peroxidase (HRP) nanobiocatalyst (HRPCu2+) obtained from Cu2+ ions and HRP enzyme in the polymerization reaction of guaiacol were analyzed. We demonstrated that HRP-Cu2+ and hydrogen peroxide (H2O2) initiator showed significantly increased catalytic activity and stability on the polymerization of guaiacol compared to that of free HRP enzyme. Poly(guaiacol) was observed with quite high yields (88%) and molecular weights (38,000 g/mol) under pH 7.4 phosphate-buffered saline (PBS) conditions at 60 °C with 5 weight% of HRP-Cu2+ loading. HRP-Cu2+ also shows very high thermal stability and works even at 70 °C reaction temperature; free HRP enzyme denatures at that temperature. Furthermore, HRP-Cu2+ provided considerable repeated use and showed some degree of catalytic activity, even after the fourth recycle, in the polymerization of guaiacol.

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Horseradish peroxidase-catalyzed polymerization of ortho-imino-phenol: Synthesis, characterization, thermal stability and electrochemical properties

Cited by 14 publications

References 26 publications

The Polymerization of Homogentisic Acid In Vitro as a Model for Pyomelanin Formation

The Polymerization of Homogentisic Acid In Vitro as a Model for Pyomelanin Formation

Horseradish peroxidase‐based hybrid nanoflowers with enhanced catalytical activities for polymerization reactions of phenol derivatives

Flowerlike hybrid horseradish peroxidase nanobiocatalyst for the polymerization of guaiacol

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