pH-controllable bioelectrocatalysis of glucose by glucose oxidase loaded in weak polyelectrolyte layer-by-layer films with ferrocene derivative as mediator

Liú, Dan; Liu, Hongyun; Hu, Naifei

doi:10.1016/j.electacta.2010.06.042

Cited by 31 publications

(24 citation statements)

References 55 publications

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“…For instance, Advincula et al reported that the PAA-BP/ PAH-BP multilayer films deposited at pH 3.0 for PAA-BP and pH 6.0 for PAH-BP (BP = benzophenone) showed pH-switchable permselectivity for both cationic and anionic probes [33]. However, to the best of our knowledge, the investigation of pH-sensitive weak polyelectrolyte LBL films in the application of bioelectrocatalysis has received only limited attention [10,14]. The development of pH-controllable biosensors based on bioelectrocatalysis is still a challenging task.…”

Section: Introductionmentioning

confidence: 96%

pH‐Switchable Bioelectrocatalysis Based on Weak Polyelectrolyte Multilayers

Sun

Liu

2010

Electroanalysis

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Weak polyelectrolytes poly(allylamine hydrochloride) (PAH) and poly(acrylic acid) (PAA) were assembled into {PAH/PAA} n layer-by-layer films on electrodes. The cyclic voltammetry (CV) response of ferrocenecarboxylic acid (Fc(COOH)) at {PAH/PAA} 5 film electrodes assembled under the specific condition showed pH-sensitive "on-off" switching property. This property was further used to control the electrocatalytic oxidation of glucose by glucose oxidase (GOD) with Fc(COOH) as the electron transfer mediator, so that the pH-switchable bioelectrocatalysis could be realized. The mechanism of pH-sensitive behavior of the system was explored and believed to originate from the pH-dependent structure change of the films.

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Section: Introductionmentioning

confidence: 96%

pH‐Switchable Bioelectrocatalysis Based on Weak Polyelectrolyte Multilayers

Sun

Liu

2010

Electroanalysis

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“…[57] It is well known that the carboxylic acid group is a functional group that can respond to pH and has been used in many pH-responsive materials, for example, surfaces with wettability transitions, [57,58] smart ion channels, [59] and switchable electrodes. [60] Therefore, it is expected that, on a substrate modified by such a monolayer, surface adhesion would exhibit a pH response.…”

Section: Resultsmentioning

confidence: 99%

Selective Transportation of Microdroplets Assisted by a Superhydrophobic Surface with pH‐Responsive Adhesion

Cheng

Lai

et al. 2013

Chemistry An Asian Journal

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We report a new strategy to realize the selective transportation of microdroplets assisted by a superhydrophobic surface with pH-responsive adhesion. On the surface, only basic microdroplets can be pinned and acidic or neutral microdroplets can easily roll off. Therefore, by using the surface as a "mechanical hand", microdroplets can be transported selectively according to one's requirements by simply controlling the pH of the solution. The special ability of the surface to achieve selective transportation is ascribed to the following two reasons: 1) superhydrophobicity, which can avoid the wetting problem, and 2) pH-responsive adhesion, which results from the combined effect of chemical variation of the carboxylic acid group and microstructures on the surface. Furthermore, we also demonstrated a process of selective transportation of microdroplets for applications in droplet-based microreactors through our surface. The results reported herein advance a new method to realize the selective transportation of microdroplets and we believe that this method could potentially be used in a wide range of applications, such as biomolecular detection and transportation in biochips.

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“…The mechanism of the pH-dependent permeability of the films toward the probe was explored by a series of comparative experiments. While the pH-switchable bioelectrocatalysis based on LBL films was reported by our group in recent years [10][11][12][13][14][15], those films were all assembled with organic materials. This work utilized the inorganic nanoparticles as the building block for assembling pH-responsive LBL films, and provided a novel model in fabricating pH-switchable biosensors based on enzymatic reactions, and also opened up the new application of metal oxide nanoparticles in stimuli-responsive bioelectrocatalysis based on their unique properties.…”

Section: Introductionmentioning

confidence: 99%

“…However, one of the major challenges in this field is to realize the controllable or stimuli-responsive bioelectrocatalysis, which is not only important for the development of tunable and switchable biosensors and other bioelectronic devices, but may also be applicable to signal amplification and information processing [4][5][6][7]. Among various stimuli in controlling bioelectrocatalysis, pH is the most studied one [4,[8][9][10][11][12][13][14][15]. For example, Katz and colleagues reported that the polymer brush functionalized with Os-complex redox units attached on electrode surface exhibited a pH-sensitive structure change and could be used to reversibly activate/deactivate the electrocatalytic oxidation of glucose in the presence of glucose oxidase (GOD) by changing solution pH chemically or biochemically [8,9].…”

Section: Introductionmentioning

confidence: 99%