Size-tuneable and micro-patterned iron nanoparticles derived from biomolecules via microcontact printing SAM-modified substrates and controlled-potential electrolyses

Tominaga, Masato; Miyahara, Katsuya; Soejima, Kazuki; Nomura, Shinya; Matsumoto, Manabu; Taniguchi, Ikuo

doi:10.1016/j.jcis.2007.04.037

Cited by 12 publications

(9 citation statements)

References 37 publications

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“…The positively charged 6‐AHT SAM was reported to facilitate the direct electron transfer (DET) of ferritin,5 and, surprisingly, cytochrome c (cyt c) also 6. Whereas free heme generated a couple of redox peaks, HTHP showed no redox signal between −0.5 and 0.2 V on the positively charged 6‐AHT SAM.…”

Section: Resultsmentioning

confidence: 99%

Surface‐Tuned Electron Transfer and Electrocatalysis of Hexameric Tyrosine‐Coordinated Heme Protein

Peng

Utesch

Yarman

et al. 2015

Chemistry A European J

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Molecular modeling, electrochemical methods, and quartz crystal microbalance were used to characterize immobilized hexameric tyrosine-coordinated heme protein (HTHP) on bare carbon or on gold electrodes modified with positively and negatively charged self-assembled monolayers (SAMs), respectively. HTHP binds to the positively charged surface but no direct electron transfer (DET) is found due to the long distance of the active sites from the electrode surfaces. At carboxyl-terminated surfaces, the neutrally charged bottom of HTHP can bind to the SAM. For this "disc" orientation all six hemes are close to the electrode and their direct electron transfer should be efficient. HTHP on all negatively charged SAMs showed a quasi-reversible redox behavior with rate constant ks values between 0.93 and 2.86 s(-1) and apparent formal potentials ${E{{0{^{\prime }}\hfill \atop {\rm app}\hfill}}}$ between -131.1 and -249.1 mV. On the MUA/MU-modified electrode, the maximum surface concentration corresponds to a complete monolayer of the hexameric HTHP in the disc orientation. HTHP electrostatically immobilized on negatively charged SAMs shows electrocatalysis of peroxide reduction and enzymatic oxidation of NADH.

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Section: Resultsmentioning

confidence: 99%

Surface‐Tuned Electron Transfer and Electrocatalysis of Hexameric Tyrosine‐Coordinated Heme Protein

Peng

Utesch

Yarman

et al. 2015

Chemistry A European J

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show abstract

“…Furthermore, the protonation-deprotonation behavior of the carboxylic acid terminated SAM is strongly influenced by the topography of the adsorbed surface. 10 The performance of a biosensor critically depends on the surface properties of a material, availability of functional groups, mode of enzyme immobilization and activity of an enzyme on the electrode surface. 11,12 The modification of free terminal groups of thiolated SAMs with biomolecules using physical adsorption may result in denaturation and loss of activity of the desired biomolecules.…”

Section: Introductionmentioning

confidence: 99%

A self assembled monolayer based microfluidic sensor for urea detection

Srivastava

Solanki²,

Kaushik³

et al. 2011

Nanoscale

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“…scale explored for synthesizing biocapsules. Past studies have reported microfluidic devices for fabrication of shape specific microparticles [136][137][138][139][140][141][142][143][144][145]. In case of nanofabrication, nanoimprint lithography, step and flash imprint lithography (S-FIL), particle replication in nonwetting templates (PRINT) have gained much attention [145][146][147][148][149].…”

Section: Top-down Synthesismentioning

confidence: 99%