scholarly journals Monitoring of Glucose in Beer Brewing by a Carbon Nanotubes Based Nylon Nanofibrous Biosensor

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Marco Mason ◽  
Edoardo Longo ◽  
Matteo Scampicchio
Keyword(s):  
Carbon Nanotubes ◽  
Electron Transfer ◽  
Cyclic Voltammetry ◽  
Electrochemical Biosensor ◽  
Carbon Electrode ◽  
Multiwalled Carbon ◽  
Beer Brewing ◽  
Brewing Process ◽  
A Current

This work presents the design, preparation, and characterization of a novel glucose electrochemical biosensor based on the immobilization of glucose oxidase (GOX) into a nylon nanofibrous membrane (NFM) prepared by electrospinning and functionalized with multiwalled carbon nanotubes (CNT). A disc of such GOX/CNT/NFM membrane (40 μm in thickness) was used for coating the surface of a glassy carbon electrode. The resulting biosensor was characterized by cyclic voltammetry and chronoamperometry, with ferrocene methanol as mediator. The binding of GOX around the CNT/NFM greatly enhances the electron transfer, which results in a biosensor with a current five times higher than without CNT. The potential usefulness of the proposed biosensor was demonstrated with the analysis of glucose in commercial beverages and along the monitoring of the brewing process for making beer, from the mashing to the fermentation steps.

scholarly journals Electrocatalytic activity of hypo–hyper-d-electrocatalysts (Me/TiO2/MWCNTs) based on Co-Ru in alkaline hydrogen electrolyser

2011 ◽  
Vol 30 (1) ◽  
pp. 55
Author(s):  
Perica Paunović ◽  
Orce Popovski ◽  
Dafinka Stoevska Gogovska ◽  
Elefteria Lefterova ◽  
Evelina Slavcheva ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Cyclic Voltammetry ◽  
Precious Metals ◽  
Water Electrolysis ◽  
Metallic Phase ◽  
Ftir Analysis ◽  
Excellent Performance ◽  
Multiwalled Carbon ◽  
Potentiodynamic Method

This study is concerned with preparation and characterization of Co-Ru based hypo-hyper d-electrocatalysts aimed for water electrolysis. The composition of the studied electrocatalysts was: 10 % mixed metallic phase (Co : Ru = 1 : 1 wt., Co:Ru = 4 : 1 wt. and Co : Ru : Pt = 4 : 0.5 : 0.5), 18 % TiO2 as a crystalline anatase deposited on activated multiwalled carbon nanotubes (MWCNTs). For comparison, corresponding electrocatalysts with pure hyper d-metallic phase (Co and Ru) were prepared. The structural characterization of the studied electrocatalysts was performed by means of XRD, SEM and FTIR analysis. The prepared hypo-hyper d-electrocatalysts were electrochemically studied by cyclic voltammetry and potentiodynamic method in the alkaline hydrogen electrolyser. The order of the catalytic activity for hydrogen evolution of studied electrocatalysts was the following: Ru > CoRuPt (4 : 0.5 : 0.5, wt.) > CoRu (1 : 1 wt.) > CoRu (4 : 1 wt.) > Co. The electrocatalyst with only 20 % precious metals (Pt and Ru) in the metallic phase (the rest being Co-metal) exhibited excellent performance approaching that of the electrocatalyst with 100 % precious metallic phase (Ru).

Broadband Electrical Characterization of Multiwalled Carbon Nanotubes and Contacts

Nano Letters ◽  
2007 ◽  
Vol 7 (4) ◽  
pp. 1086-1090 ◽  
Author(s):  
Paul Rice ◽  
T. Mitch Wallis ◽  
Stephen E. Russek ◽  
Pavel Kabos
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Electrical Characterization ◽  
Multiwalled Carbon

ERDA and Structural Characterization of Oriented Multiwalled Carbon Nanotubes

2007 ◽  
Vol 111 (28) ◽  
pp. 10353-10358 ◽  
Author(s):  
A. Gohier ◽  
S. Point ◽  
M. A. Djouadi ◽  
A. Granier ◽  
T. M. Minea ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Structural Characterization ◽  
Multiwalled Carbon

Preparation and Characterization of Glycyrrhizin-Graphene Hybrid Materials

2012 ◽  
Vol 531 ◽  
pp. 145-148
Author(s):  
Zong Hua Wang ◽  
Yan Li Gao ◽  
Jian Fei Xia ◽  
Fei Fei Zhang ◽  
Yan Zhi Xia ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Hybrid Materials ◽  
Model Compound ◽  
Carbon Electrode ◽  
The Novel ◽  
Electron Transfer Process ◽  
Efficient Energy ◽  
Sandwich Construction ◽  
Photo Induced Electron Transfer

A glycyrrhizin decorated graphene hybrid materials (GL-G) was synthesized, which is a layer-to-layer sandwich construction. The results of characterization indicate that a photo induced electron transfer process or efficient energy transferring along the GL-G interface. Furthermore, the as-made hybrid material was used as a modifier of the glassy carbon electrode to construct a sensor (GL-G/GCE). Using p-nitrophenol as a model compound, the novel sensor demonstrated a highly enhanced electrochemical activity for it. The peak current of p-nitrophenol was significantly improved at the sensor.

Preparation and application of copper hydroxide (oxide) / multiwalled carbon nanotubes nanocomposite-modified glassy carbon electrode as a nitrite sensor

2012 ◽  
Vol 90 (6) ◽  
pp. 517-525 ◽  
Author(s):  
Youqin Liu ◽  
Xiuying Tian ◽  
Yun Yan ◽  
Yuehua Xu
Keyword(s):  
Carbon Nanotubes ◽  
Detection Limit ◽  
Multiwalled Carbon Nanotubes ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
High Catalytic Activity ◽  
Carbon Electrode ◽  
Copper Hydroxide ◽  
Modified Glassy Carbon Electrode ◽  
Multiwalled Carbon

Copper hydroxide (oxide) / multiwalled carbon nanotubes nanocomposite-modified glassy carbon electrode (Cuhydroxide/oxide/MWCNTs/GCE) was successfully prepared by a novel film plating / cyclic voltammetry (CV) method, which exhibited marked synergistic catalytic effects on the electro-oxidation of NO2–. The preparation process, impedance behavior, and surface morphology of Cuhydroxide/oxide/MWCNTs/GCE were investigated by CV, electrochemical impedance spectroscopy, and scanning electron microscopy (SEM), respectively. The optimum preparation and test conditions for the electrode to have high catalytic activity were acquired. The linear range between the anodic current (Δia, µA) and NO2– concentration (c, mmol L−1) was 1.0 × 10−4 to 14.0 mmol L−1, and the corresponding calibration curve was Δia = −0.1504 + 57.954c (R = 0.9990, n = 32) with a detection limit of 0.03 µmol L−1 (S/N = 3). The Cuhydroxide/oxide/MWCNTs/GCE prepared in the optimal conditions showed good stability, high selectivity, low detection limit, and quick response (<0.2 s) to NO2– in phosphate buffer (pH 5.29) at 0.78 V, which has been successfully applied to the determination of NO2– in pickled vegetables with satisfactory results.

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