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A well-defined Ag@AgCl nanocubes loaded on the reduced graphene oxide plasmonic heterostructure (Ag@AgCl/RGO) was facilely prepared by sacrificial salt-crystal-template process and ethylene glycol-assisted reduction. The Ag@AgCl/RGO heterostructure shows superior photocurrent response and stability under the visible light irradiation. The enhanced performance mainly attributes to the plasmon resonance effect of AgNPs by improving the absorbance and transfer of photogenerated electrons. Significantly, we observed that the photocurrent could be dramatically decreased with the introduction of HO and experimental results demonstrated the etching effect of HO to AgNPs should be responsible for this phenomenon. Inspired by this phenomenon, employing HO that generated from glucose oxidase catalyzed glucose triggered AgNPs etching as a novel signal mode, an improved photoelectrochemical immunosensing platform was constructed by employing Ag@AgCl/RGO heterostructure as photoactive material. As a proof of concept application, the photoelectrochemical immunosensor employed for ochratoxin A (OTA) detection with competitive-type format and it exhibited excellent analytical performance. Under optimized conditions, the photocurrent increased with the concentration of target OTA in the dynamic range of 0.05 to 300 nM with a limit of detection (LOD) of 0.01 nM (4.0 pg mL). The immunosensor also showed high sensitivity, good reproducibility, and satisfactory accuracy. Although the methodology proposed here focused on OTA sensing, it could flexibly extend to monitor other targets by replacing the corresponding bio-recognition elements. Thus, this work provides a new paradigm for designing novel photoelectrochemical biosensing mode based on the plasmonic metal/semiconductor heterostructure.
This article was published in the following journal.
Name: Biosensors & bioelectronics
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Preparation of TOOTH surfaces and DENTAL MATERIALS with etching agents, usually phosphoric acid, to roughen the surface to increase adhesion or osteointegration.
Preparation of TOOTH surfaces, and of materials bonded to teeth or DENTAL IMPLANTS, with agents and methods which roughen the surface to facilitate adhesion. Agents include phosphoric or other acids (ACID ETCHING, DENTAL) and methods include LASERS.
A large family of signal-transducing adaptor proteins present in wide variety of eukaryotes. They are PHOSPHOSERINE and PHOSPHOTHREONINE binding proteins involved in important cellular processes including SIGNAL TRANSDUCTION; CELL CYCLE control; APOPTOSIS; and cellular stress responses. 14-3-3 proteins function by interacting with other signal-transducing proteins and effecting changes in their enzymatic activity and subcellular localization. The name 14-3-3 derives from numerical designations used in the original fractionation patterns of the proteins.
Signal transduction mechanisms whereby calcium mobilization (from outside the cell or from intracellular storage pools) to the cytoplasm is triggered by external stimuli. Calcium signals are often seen to propagate as waves, oscillations, spikes, sparks, or puffs. The calcium acts as an intracellular messenger by activating calcium-responsive proteins.
CELL CYCLE regulatory signaling systems that are triggered by DNA DAMAGE or lack of nutrients during G2 PHASE. When triggered they restrain cells transitioning from G2 phase to M PHASE.