scholarly journals Tailoring Imprinted Titania Nanoparticles for Purines Recognition

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Adnan Mujahid ◽  
Amna Najeeb ◽  
Aimen Idrees Khan ◽  
Tajamal Hussain ◽  
Muhammad Hamid Raza ◽  
...  
Keyword(s):  
Uric Acid ◽  
Titania Nanoparticles ◽  
Selective Recognition ◽  
Nonspecific Binding ◽  
Sem Images ◽  
Titanium Butoxide ◽  
Sensitivity Studies ◽  
Standard Solution ◽  
Hydrolysis Of ◽  
Images Recognition

Molecular imprinted titania nanoparticles were developed for selective recognition of purines, for example, guanine and its final oxidation product uric acid. Titania nanoparticles were prepared by hydrolysis of titanium butoxide as precursor in the presence of pattern molecules. The morphology of synthesized nanoparticles is evaluated by SEM images. Recognition characteristics of imprinted titania nanoparticles are studied by exposing them to standard solution of guanine and uric acid, respectively. The resultant change in their concentration is determined by UV/Vis analysis that indicated imprinted titania nanoparticles possess high affinity for print molecules. In both cases, nonimprinted titania is taken as control to observe nonspecific binding interactions. Cross sensitivity studies suggested that imprinted titania is at least five times more selective for binding print molecules than competing analyte thus indicating its potential for bioassay of purines.

scholarly journals Molecularly imprinted titania nanoparticles for selective recognition and assay of uric acid

2014 ◽  
Vol 5 (5) ◽  
pp. 527-534 ◽  
Author(s):  
Adnan Mujahid ◽  
Aimen Idrees Khan ◽  
Adeel Afzal ◽  
Tajamal Hussain ◽  
Muhammad Hamid Raza ◽  
...  
Keyword(s):  
Uric Acid ◽  
Titania Nanoparticles ◽  
Selective Recognition ◽  
Molecularly Imprinted

Improving the efficiency of enzymatic hydrolysis of Eucalyptus residues with a modified aqueous ammonia soaking method

2018 ◽  
Vol 33 (2) ◽  
pp. 165-174 ◽  
Author(s):  
Dan Huo ◽  
Qiulin Yang ◽  
Guigan Fang ◽  
Qiujuan Liu ◽  
Chuanling Si ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Enzymatic Hydrolysis ◽  
Aqueous Ammonia ◽  
Pulp Mill ◽  
Fiber Surface ◽  
Raw Material ◽  
Sem Images ◽  
Aqueous Ammonia Soaking ◽  
Guaiacyl Lignin ◽  
Hydrolysis Of

Abstract Eucalyptus residues from pulp mill were pretreated with aqueous ammonia soaking (AAS) method to improve the efficiency of enzymatic hydrolysis. The optimized condition of AAS was obtained by response surface methodology. Meanwhile, hydrogen peroxide was introduced into the AAS system to modify the AAS pretreatment (AASP). The results showed that a fermentable sugar yield of 64.96 % was obtained when the eucalypt fibers were pretreated at the optimal conditions, with 80 % of ammonia (w/w) for 11 h and keeping the temperature at 90 °C. In further research it was found that the addition of H2O2 to the AAS could improve the pretreatment efficiency. The delignification rate and enzymatic digestibility were increased to 64.49 % and 73.85 %, respectively, with 5 % of hydrogen peroxide being used. FTIR analysis indicated that most syringyl and guaiacyl lignin and a trace amount of xylan were degraded and dissolved during the AAS and AASP pretreatments. The CrI of the raw material was increased after AAS and AASP pretreatments, which was attributed to the removal of amorphous portion. SEM images showed that microfibers were separated and explored from the initial fiber structure after AAS pretreatment, and the AASP method could improve the destructiveness of the fiber surface.

scholarly journals Synthesis, Characterization, and Biodegradation Studies of Poly(1,4-cyclohexanedimethylene-adipate-carbonate)s

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Ajay S. Chandure ◽  
Ganesh S. Bhusari ◽  
Suresh S. Umare
Keyword(s):  
Weight Loss ◽  
Enzymatic Degradation ◽  
Hydrolytic Degradation ◽  
Phosphate Buffer Solution ◽  
Film Surface ◽  
Solution Viscosity ◽  
Buffer Solution ◽  
Sem Images ◽  
Titanium Butoxide ◽  
Soil Burial

Aliphatic/alicyclic poly(1,4-cyclohexanedimethylene-adipate-carbonate)s (PCACs) were synthesized by a transesterification from 1,4-cyclohexamethylendimethanol (1,4-CHDM), adipic acid (AA), diethyl carbonate (DEC), and titanium butoxide Ti(OBu)4 as a transesterification catalyst. The synthesized PCACs were characterized by the Fourier transform infrared (FTIR), X-ray diffraction analysis (XRD), solubility, solution viscosity, gel permeation chromatography (GPC), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and scanning electron microscope (SEM) for their structural, physical, thermal, and morphological investigation. The structure of synthesized PCACs was confirmed by FTIR. All TGA curves of PCACs shows 10% weight loss above 270°C, and they reveal good thermal stability. Biodegradability of PCACs was investigated by hydrolytic degradation at (pH 7.2 and 11.5), enzymatic degradation using Rhizopus delemar lips at 37°C in phosphate buffer solution (PBS), and soil burial degradation at 30°C. The hydrolytic degradation shows the greater rate of weight loss in PBS at pH-11.5 than pH-7.2. The hydrolytic and soil burial degradation shows faster rate of weight loss as compared to enzymatic degradation. Biodegradation rate of PCACs follows the order: PCAC-20 > PCAC-40 > PCAC-60. SEM images show that degradation occurred all over the film surface, creating holes and cracks. These biodegradable PCACs may be able to replace conventional polymer in the fabrication of packaging film in near future.

Preparation of TiO2 Film through Hydrolysis of Titanium Butoxide and Interaction between Sensitizing Dyes and the Film

1997 ◽  
Vol 13 (08) ◽  
pp. 752-755
Author(s):  
Wang Li-Ying ◽  
◽  
Zhang Yan ◽  
Zeng Guang-Fu ◽  
Xi Shi-Quan
Keyword(s):  
Titanium Butoxide ◽  
Hydrolysis Of

Titania nanoparticles by acidic peptization of xerogel formed by hydrolysis of titanium(IV) isopropoxide under atmospheric humidity conditions

2013 ◽  
Vol 245 ◽  
pp. 156-162 ◽  
Author(s):  
Kamal M.S. Khalil ◽  
Rafat M. El-Khatib ◽  
Tarek T. Ali ◽  
Hatem A. Mahmoud ◽  
Ahmed A. Elsamahy
Keyword(s):  
Titania Nanoparticles ◽  
Atmospheric Humidity ◽  
Hydrolysis Of

Effects of Surfactant Composition and Concentration on Shape, Size and Photocatalytic Activity of TiO2 Nanoparticles

2007 ◽  
Vol 5 (1) ◽  
Author(s):  
Dongliang Liao ◽  
Baoqiang Liao
Keyword(s):  
Photocatalytic Activity ◽  
Tio2 Nanoparticles ◽  
Sol Gel ◽  
Photocatalytic Decomposition ◽  
Batch Reactors ◽  
Order Kinetic ◽  
Titanium Butoxide ◽  
Reaction Rate Constants ◽  
Surfactant Composition ◽  
Hydrolysis Of

Various shapes and sizes, including spherical, cubic nanoparticles and hexagonal nanorods with the dimensions of 50-500nm, of TiO2 were prepared through hydrolysis of titanium butoxide in sol-gel method with the introduction of different surfactant composition and concentrations during preparation. Prepared TiO2 nanoparticles were studied for photocatalytic decomposition of methyl orange (MO) in fixed film batch reactors. The results showed that shape, size and photocatalytic activity of TiO2 depend not only on surfactant composition but also on surfactant concentration. Photocatalytic decomposition of MO followed the first order kinetic reaction. The analysis of reaction rate constants showed that the shape is more important than the size in determining the photocatalytic activity of shape- and size-controlled TiO2 nanoparticles. TiO2 nanorods had higher photocatalytic activities than spherical and cubic TiO2 nanoparticles.

γ-Irradiation Induced Synthesis of Titanium Dioxide/Poly(acrylic acid) (TiO2/PAA) Nanocomposites and Layer-by-Layer Assembly on Glass Substrate

2015 ◽  
Vol 1098 ◽  
pp. 25-30 ◽  
Author(s):  
Lawrence John Paulo L. Trinidad ◽  
Ken Aldren S. Usman ◽  
Leon M. Payawan
Keyword(s):  
Acrylic Acid ◽  
Layer Thickness ◽  
Titania Nanoparticles ◽  
Cross Linking ◽  
Layer By Layer ◽  
Γ Irradiation ◽  
Sem Images ◽  
Nucleation Sites ◽  
Anatase Titania ◽  
Poly Acrylic Acid

Adsorption and encapsulation of the nanoparticles in polyelectrolytes impart stability to the nanometal by preventing aggregation through electrostatic and steric effects. Poly (acrylic acid) (PAA) was employed as a polymer cap to anatase titania nanoparticles. Cross-linking of the polymer was done via free-radical cross-linking using gamma-irradiation. The size of the nanocomposite produced ranged from 40-120 nm. SEM images showed that excess TiO2 in solution becomes nucleation sites for aggregation. Film assembly of the synthesized nanocomposite were done by layer-by-layer deposition with PDDA. Films formed with increasing thickness (5, 10, and 15 layers) were analyzed under AFM and shown to have a thickness of 0.25 μm, 1.1μm and 3.0 μm respectively.The average film layer thickness obtained ranged from 50-200 nm per TiO2/PAA-PDDA layer where as the number of layers deposited increase, the layer thickness increase while the roughness decreases.

Micro-roughening of polyamide fabric using protease enzyme for improving adhesion strength of rubber-polyamide composite

2017 ◽  
Vol 37 (3) ◽  
pp. 297-306 ◽  
Author(s):  
S. Periyasamy ◽  
G. Krishna Prasad ◽  
Sajal Kumar Chattopadhyay ◽  
A.S.M. Raja ◽  
K. Raj Kumar ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Adhesion Strength ◽  
Hydrolytic Degradation ◽  
Peel Strength ◽  
Enzyme Concentration ◽  
Enzyme Treatment ◽  
Sem Images ◽  
Protease Enzyme ◽  
Nylon 6,6 ◽  
Hydrolysis Of

Abstract The adhesion between rubber and the reinforcing textile plays an important role in ensuring the serviceability of composites. The present study aims to develop an enzyme based surface roughening process for nylon 6,6 fabric to improve its adhesion strength to rubber. Polyamide (nylon 6,6) fabric was micro-roughened through catalysed hydrolytic degradation of the surface chains, using a protease enzyme treatment. The concentration of the enzyme was optimized in terms of surface roughness measured by a KES-FB4 surface tester. Scanning electron microscopy (SEM) images of the protease treated fabric showed a heterogeneous rough appearance with cracks and pits. Fourier transform infrared (FTIR) analysis confirmed the surface hydrolysis of polyamide-6,6 due to the enzymatic treatment. Protease enzyme treated fabrics were then subjected to resorcinol formaldehyde latex (RFL) treatment, followed by a rubber moulding. Micro-roughening of nylon 6,6 fibre with an optimum surface roughness (SMD) of 20.3 μm was obtained for 3% enzyme concentration. Physicochemical mechanisms of the optimum effect and enzyme assisted hydrolysis were proposed. In line with surface roughness, peel strength also increased up to an enzyme concentration of 3% and then it decreased, however, the enzyme treated fabric showed higher peel strength than the control fabric.

Fe2O3 and V2O5 Nanoparticles: A New Voltammetric Sensor

2013 ◽  
Vol 678 ◽  
pp. 331-334
Author(s):  
R. Suresh ◽  
K. Giribabu ◽  
L. Vijayalakshmi ◽  
A. Stephen ◽  
V. Narayanan
Keyword(s):  
Thermal Decomposition ◽  
Uric Acid ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Electrocatalytic Activity ◽  
Decomposition Method ◽  
Carbon Electrode ◽  
Voltammetric Sensor ◽  
Sem Images ◽  
Thermal Decomposition Method

The Fe2O3 and V2O5 nanoparticles were prepared by thermal decomposition method. The XRD and FTIR spectrum of the samples confirms the formation of Fe2O3 and V2O5. The FE- SEM images showed the morphology and size of the samples. The synthesized Fe2O3 and V2O5 nanoparticles were used to modify the glassy carbon electrode (GCE) and the modified electrode was found to exhibit electrocatalytic activity for the oxidation of uric acid (UA). It shows that the nanoparticles will exhibit promising applications in the development of sensors.

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