scholarly journals The Effect of Nano-Zinc Oxide and Nano-Titanium Dioxide on Inhabitation of Ochratoxin A

2021 ◽  
pp. 4406-4415
Author(s):  
Layla R. Al-Saji ◽  
Ahmed I. Al-Nazzal
Keyword(s):  
Particle Size ◽  
Ochratoxin A ◽  
Agricultural Research ◽  
Aspergillus Ochraceus ◽  
Particle Sizes ◽  
Inhibition Rate ◽  
Nano Zinc Oxide ◽  
Nano Zinc ◽  
Nano Titanium Dioxide ◽  
Research Office

    The experiment was conducted at the Agricultural Research Office in Baghdad during July 2020 to test the ability of nanomaterials (ZnO and TiO2) to inhibit  ochratoxin A, which is produced by a number of microbiology (fungi) including: Aspergillus ochraceus, A. niger, ,A. steynii, A. carbonarius,  Pencillume verrucosum and P. nordicum. The standard ochratoxin A, with known concentration, was treated with different concentrations of nanomaterials  (20, 40, 60, and 80 ppm) and two different particle sizes of nanoparticles approximately (15 nm) and (70 nm) for each (ZnO) and TiO2; with 16 transactions. Through an examination of the HPLC, the results showed that all transactions led to a noticeable inhibition in the concentration of ochratoxin A, and the highest inhibition rate was for ZnO nanoparticles with particle-size (70 nm) and 80 ppm concentration, where the inhibition rate was 99%. In other hand, the TiO2 nanoparticles with particle-sized (70 nm) and the concentration (80 ppm) were followed by 95%.

scholarly journals Preparation of Nanocomposite Alginate Fibers Modified with Titanium Dioxide and Zinc Oxide

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1040
Author(s):  
Dominik Borkowski ◽  
Izabella Krucińska ◽  
Zbigniew Draczyński
Keyword(s):  
Zinc Oxide ◽  
Titanium Dioxide ◽  
Antibacterial Properties ◽  
Natural Polymers ◽  
Nano Zinc Oxide ◽  
Nano Additives ◽  
Alginate Fibers ◽  
Nano Zinc ◽  
Nano Titanium Dioxide ◽  
Selection Of

Active dressings based on natural polymers are becoming increasingly popular on the market. One of such polymers is alginate, which is characterized by biodegradability, resorbability, has no carcinogenic properties, does not have allergenic or hemostatic properties, and has a confirmed lack of toxicity. However, this polymer does not show biocidal and biostatic properties, therefore the purpose of this research was to select the appropriate conditions for the production of calcium alginate fibers modified with nano titanium dioxide and nano zinc oxide. It was assumed that the presence of nano metal oxide fillers will give antibacterial properties to formed fibers, which were used to form nonwovens. The following article presents a comparative analysis of nonwovens made of alginate fibers, without nano additives, with nonwovens made of alginate fibers containing in their structure 7% titanium dioxide and nonwovens made of alginate fibers containing 2% ZnO. The selection of the nano additive content was determined by the spinning ability of the developed polymer solutions. Based on the results contained in the article, it was found that the introduction of modifiers in the structure of fibers increases the diameter of the fiber pores, which improves the sorption and retention properties of the obtained fibers, and also gives differentiated antibacterial properties to the obtained nonwovens depending on the type of nano additive used. Greater activity against Escherichia coli, Staphylococcus aureus strains and Aspergillus Niger molds was shown in nonwovens made of 2% ZnO modified fibers compared to nonwovens made from TiO2 modified fibers.

Study on Nano-Particle Modified Epoxy Resin Adhesive

2011 ◽  
Vol 415-417 ◽  
pp. 35-38 ◽  
Author(s):  
Guang Qing Gai ◽  
Xiang Ting Dong ◽  
Xue Song Chen ◽  
Cheng Yan Zheng
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Nano Particles ◽  
Nano Particle ◽  
Resin Adhesive ◽  
Nano Zinc Oxide ◽  
Epoxy Resin Adhesive ◽  
Nano Zinc ◽  
Nano Titanium Dioxide ◽  
Modified Epoxy

The nano-particle modified epoxy resin adhesive was prepared by adding different types of nanoparticles to the epoxy resin adhesives.The influence of the kinds and amount of nanoparticles on the mechanical properties of epoxy resin adhesive was investigated.The investigation results indicated that the addition of three kinds of nanoparticles including nano-silica,nano-titanium dioxide,nano zinc oxide to epoxy resin adhesive has a significant influence on the mechanical properties of nano-composites.And tensile strength and breaking elongation of nano-composites reached the maximum when the amount of nanoparticle reached 4wt%.In addition,the toughening mechanisms of nano-particles modified epoxy resin adhesives was analysed.

Effect of Different Particle Size of Nano-Zinc Oxide on the Surface Binding Energy in Polyimide/Zinc Oxide Composites

2013 ◽  
Vol 785-786 ◽  
pp. 556-560 ◽  
Author(s):  
Jia Qi Lin ◽  
Hui Lin ◽  
Wen Long Yang ◽  
Xiao Kang Li ◽  
Ying Liu ◽  
...  
Keyword(s):  
Particle Size ◽  
Zinc Oxide ◽  
Binding Energy ◽  
Surface Binding ◽  
Nano Zno ◽  
Surface Binding Energy ◽  
Nano Zinc Oxide ◽  
Nano Zinc ◽  
Oxide Composites ◽  
The Relationship

The surface binding energy between the polyimide(PI) and zinc oxide (ZnO) have been simulated using the molecular dynamics theory.The PI / ZnO model has been established by using Forcite program package of Materials Studio software.The total atoms number about 300 million, the radius of the nano-ZnO cluster model have five groups are respectively 0.5 nm, 1 nm, 1.5 nm, 2 nm, 2.5 nm.The effect of different particle size of nano-ZnO on surface binding energy in PI / ZnO composites was investigated. The relationship between the surface binding energy of PI / ZnO composites and the nano-Zno radius, the maximum of surface binding energy were obtained. The computed results show that the intermolecular bonds between nano-ZnO and PI are mainly van der waals bonds.And the surface atomic number of nano-ZnO increases along with the increasing of nano-ZnO radius, indicating that the increasing of contact surface between the nano-ZnO and PI, which lead to the surface binding energy increases, the total energy lower and the system more stable.

Morphology, Structure and Particle Size of Hybrid Nanozinc Oxide

2017 ◽  
Vol 728 ◽  
pp. 204-208
Author(s):  
Tanapak Metanawin ◽  
Praripatsaya Panutumrong ◽  
Siripan Metanawin
Keyword(s):  
Particle Size ◽  
Zinc Oxide ◽  
Miniemulsion Polymerization ◽  
Polymer Materials ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nano Zinc Oxide ◽  
Oxide Particles ◽  
Zinc Oxide Particles ◽  
Nano Zinc

The hybrid polymer materials of nano-zinc oxide were synthesized via miniemulsion polymerization technique. Zinc oxide nanoparticles were encapsulated by polystyrene to introduce multi-function to the hybrid nano-zinc oxide. The contents of zinc oxide particles in the hybrid nano-zinc oxide were various from 1wt% to 40wt%. The particles sizes of hybrid nano-zinc oxide were determined by using dynamic light scattering. It was showed that the particle size of the hybrid nano-zinc oxide was in the range of 124-205nm. Scanning electron microscopy was employed to determine the topography and morphology of hybrid nano-zinc oxide. The crystal structure of hybrid nano-zinc oxide were explored by X-ray diffraction spectroscopy.

scholarly journals Influence of particle size of nano zinc oxide on the controlled delivery of Amoxicillin

2012 ◽  
Vol 3 (5) ◽  
pp. 441-451 ◽  
Author(s):  
L. Palanikumar ◽  
S. Ramasamy ◽  
G. Hariharan ◽  
C. Balachandran
Keyword(s):  
Particle Size ◽  
Zinc Oxide ◽  
Controlled Delivery ◽  
Nano Zinc Oxide ◽  
Nano Zinc

Surface energy of cellulosic materials: The effect of particle morphology, particle size, and hydroxyl number

TAPPI Journal ◽  
2015 ◽  
Vol 14 (9) ◽  
pp. 565-576 ◽  
Author(s):  
YUCHENG PENG ◽  
DOUGLAS J. GARDNER
Keyword(s):  
Particle Size ◽  
Surface Energy ◽  
Particle Morphology ◽  
Nanofibrillated Cellulose ◽  
Particle Sizes ◽  
Hydroxyl Number ◽  
Small Individual ◽  
Dispersion Component ◽  
Commercial Applications ◽  
Lower Temperature

Understanding the surface properties of cellulose materials is important for proper commercial applications. The effect of particle size, particle morphology, and hydroxyl number on the surface energy of three microcrystalline cellulose (MCC) preparations and one nanofibrillated cellulose (NFC) preparation were investigated using inverse gas chromatography at column temperatures ranging from 30ºC to 60ºC. The mean particle sizes for the three MCC samples and the NFC sample were 120.1, 62.3, 13.9, and 9.3 μm. The corresponding dispersion components of surface energy at 30°C were 55.7 ± 0.1, 59.7 ± 1.3, 71.7 ± 1.0, and 57.4 ± 0.3 mJ/m2. MCC samples are agglomerates of small individual cellulose particles. The different particle sizes and morphologies of the three MCC samples resulted in various hydroxyl numbers, which in turn affected their dispersion component of surface energy. Cellulose samples exhibiting a higher hydroxyl number have a higher dispersion component of surface energy. The dispersion component of surface energy of all the cellulose samples decreased linearly with increasing temperature. MCC samples with larger agglomerates had a lower temperature coefficient of dispersion component of surface energy.

scholarly journals Effect of particle size on phytochemical composition and antioxidant properties of Sargassum cristaefolium ethanol extract

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
E. S. Prasedya ◽  
A. Frediansyah ◽  
N. W. R. Martyasari ◽  
B. K. Ilhami ◽  
A. S. Abidin ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Particle Size ◽  
Antioxidant Activities ◽  
Antioxidant Properties ◽  
Ethanol Extract ◽  
Total Phenolic ◽  
Particle Sizes ◽  
Epicatechin Gallate ◽  
Particle Size Reduction ◽  
Phytochemical Composition

AbstractSample particle size is an important parameter in the solid–liquid extraction system of natural products for obtaining their bioactive compounds. This study evaluates the effect of sample particle size on the phytochemical composition and antioxidant activity of brown macroalgae Sargassum cristaefolium. The crude ethanol extract was extracted from dried powders of S.cristeafolium with various particle sizes (> 4000 µm, > 250 µm, > 125 µm, > 45 µm, and < 45 µm). The ethanolic extracts of S.cristaefolium were analysed for Total Phenolic Content (TPC), Total Flavonoid Content (TFC), phenolic compound concentration and antioxidant activities. The extract yield and phytochemical composition were more abundant in smaller particle sizes. Furthermore, the TPC (14.19 ± 2.08 mg GAE/g extract to 43.27 ± 2.56 mg GAE/g extract) and TFC (9.6 ± 1.8 mg QE/g extract to 70.27 ± 3.59 mg QE/g extract) values also significantly increased as particle sizes decreased. In addition, phenolic compounds epicatechin (EC), epicatechin gallate (ECG), epigallocatechin (EGC), and Epigallocatechin gallate (EGCG) concentration were frequently increased in samples of smaller particle sizes based on two-way ANOVA and Tukey’s multiple comparison analysis. These results correlate with the significantly stronger antioxidant activity in samples with smaller particle sizes. The smallest particle size (< 45 µm) demonstrated the strongest antioxidant activity based on DPPH, ABTS, hydroxyl assay and FRAP. In addition, ramp function graph evaluates the desired particle size for maximum phytochemical composition and antioxidant activity is 44 µm. In conclusion, current results show the importance of particle size reduction of macroalgae samples to increase the effectivity of its biological activity.

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