A typical glucose sensor is a oxidase (GOx) enzyme-based due to its high sensitivity and selectivity. However, it has difficulty activating stabilizing the enzyme. To enhance stability of GOx-based sensors, chitosan added ZnS-doped Mn nanoparticles. Chitosan stabilizes particles can induce charge processes such as creation, transfer, separation at polymer interface nanoparticles' interface. Hen...

two poly(oxyethylene) derivatives 1.10-bis(2'-benzoic acid)-1,4,7,1-tetradecane (l1) and 1,7-bis(2'-benzoic acid)-1,4,7-trioxaheptane (l2) were used as suitable ionophores for the preparation of potassium-selective pvc-membrane electrodes. the resulting electrodes based on l1 and l2 exhibit linear responses to the activity of k+ ions within the concentration ranges of 3.1´10-5 -2.7´10-2 m and 2...

the electrocatalytic degradation of methyl orange (mo) on pbo2-tio2 nanocomposite electrodes was studied by cyclic voltammetry and bulk electrolysis. the results reveal that pbo2-tio2 nanocomposite electrodes possess higher oxygen evolution overpotential than pbo2 electrodes and the electrocatalytic degradation of mo on the electrodes is direct oxidation process. the influence of experimental p...

The research has developed an enzyme biosensor for the detection organophosphate pesticide residues. The biosensor consists of a pair of screen-printed carbon electrode (SPCEs). One of electrodes contains immobilized organophosphate hydrolase (OPH) on a chitosan membrane by cross-linking it with glutaraldehyde. The area of the electrodes was optimized to 3, 5, and 7 mm(2). The OPH was isolated ...

Materials Unless otherwise stated, FAD-dependent glucose dehydrogenase (E.C.: 1.1.99.10, Aspergillus sp., GLDE-70-1192) was purchased from Sekisui Diagnostics (UK) and used without any further purification. For comparison experiments, GDH was also purchased from Amano Enzyme Inc., Japan (“Amano 8”, Aspergillus oryzae) and BBI Solutions USA (GLD1, Aspergillus oryzae). Bilirubin oxidase (Myrothec...

The application of silicalite for improvement of enzyme adsorption on new stainless steel electrodes is reported. Glucose oxidase (GOx) was immobilized by two methods: cross-linking by glutaraldehyde (GOx-GA) and cross-linking by glutaraldehyde along with GOx adsorption on silicalite-modified electrode (SME) (GOx-SME-GA). The GOx-SME-GA biosensors were characterized by a four- to fivefold highe...

sol-gel and polymeric membrane electrodes, based on thiacalix[4]arene as a neutral carrier, weresuccessfully developed for the detection of vo2+ in aqueous solutions. the sol-gel and pvcmembrane electrodes exhibited linear response with nernstian slopes of 29.3 and 28.4 mv perdecade, respectively, within the vanadyl ion concentration ranges from 1.0 × 10-6 to 1.0 × 10-1mol dm-3 and from 1.0 × 1...

Enzyme sensors based on the measurement of pH consist basically of a pH-sensitive electrode to which an enzyme-loaded membrane is attached. The conversion of substrate in the immobilized enzyme membrane results in a local change in pH which can then be measured. The pH-sensitive electrode used is usually a glass membrane electrode or an ISFET. In 1980, Caras and Janata [l] described the first I...

Conducting polymers have emerged as potential candidates for biosensors. Due to their straightforward preparation methods, unique properties, and stability in air, conducting polymers have been applied to energy storage, electrochemical devices, memory devices, biosensors, and electro catalysts. Many research studies have been conducted on the use of conjugated polymers in the construction of c...