scholarly journals Effect of nickel oxide nanoparticles on protease activity in brewing industry

2021 ◽  
Vol 845 (1) ◽  
pp. 012110
Author(s):  
D V Karpenko ◽  
S A Kanaev
Keyword(s):  
Nickel Oxide ◽  
Enzyme Preparation ◽  
Molecular Nitrogen ◽  
Reaction Medium ◽  
Oxide Nanoparticles ◽  
Industrial Complex ◽  
Nio Nanoparticles ◽  
Nickel Oxide Nanoparticles ◽  
Barley Malt ◽  
Amine Nitrogen

Abstract Intensive use of nanoparticles on an industrial scale leads to an increase in their content in the environment. This increases the risks of nano-sized objects entering the technological chains of the processing industries of the agro-industrial complex, in particular, brewing. The paper presents the results of the studies of the effect of nickel oxide nanoparticles used in various industries on the activity of the proteolytic type of enzyme preparation Neutrase 1.5MG, as well as on the results of laboratory mashing of light barley malt. The effect of different concentrations of NiO nanoparticles on the accumulation of low molecular weight nitrogenous substances during gelatin hydrolysis in model media was determined. It was found that if the content of nanoparticles exceeds 0.25 mg/cm3, the proteolytic capacity of the enzyme preparation is reduced up to 70% compared to the control at the concentration of nickel oxide nanopreparation of 2.0 mg/cm3. The experiments showed that an increase in the duration of contact between nanoparticles and proteases of the enzyme preparation in the reaction medium did not lead to an increase in the inhibitory effect of the nano-sized NiO. The laboratory mashing revealed more pronounced negative effect of nickel oxide nanoparticles on the accumulation of low-molecular nitrogen compounds. It is determined that in the presence of NiO nanopreparation, the hydrolysis efficiency of the starchy components of light barley malt is reduced. As a result, according to a number of indicators (concentration of amine nitrogen, reducing substances), the first wort obtained by mashing in the presence of nickel oxide nanoparticles at both lower (0.25 mg/cm3) and higher (2.0 mg/cm3) concentrations is inferior to samples obtained in the absence of nano-sized particles. Based on the above data, it is concluded that the presence of NiO nanoparticles in brewing environments is undesirable.

A ppb-Level Formaldehyde Gas Sensor Based on Rose-Like Nickel Oxide Nanoparticles Prepared Using Electrodeposition Process

NANO ◽  
2016 ◽  
Vol 11 (01) ◽  
pp. 1650009 ◽  
Author(s):  
Yong Zhang ◽  
Long-Zhen Xie ◽  
Chao-Xin Yuan ◽  
Chun-Lin Zhang ◽  
Su Liu ◽  
...  
Keyword(s):  
Nickel Oxide ◽  
Indium Tin Oxide ◽  
Gas Sensing ◽  
Operating Temperature ◽  
Oxide Nanoparticles ◽  
Nio Nanoparticles ◽  
Nickel Oxide Nanoparticles ◽  
Glass Substrates ◽  
Ito Glass ◽  
Concentration Properties

In this study, rose-like nickel oxide nanoparticles (diameter of 400–500[Formula: see text]nm) were prepared on indium tin oxide (ITO) glass substrates by a simple electrodeposition in NiSO[Formula: see text]6H2O solution. Scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmission electron microscope (TEM) were used for analysis of the NiO nanoparticles. The effects of operating temperature on the sensor response and the response versus gas concentration properties of the NiO nanorose-based sensors were investigated. We determined the operating temperature of the gas sensors to be 230[Formula: see text]C, considering the proper sensitivity and a rapid response. In addition, gas-sensing characteristics of rose-like NiO nanoparticles to formaldehyde were investigated. It was shown that the sensors exhibited good response ([Formula: see text]/[Formula: see text]) properties to formaldehyde gas at 230[Formula: see text]C, making them to be promising candidates for practical detectors to formaldehyde gas.

scholarly journals Chitosan capped nickel oxide nanoparticles as a saturable absorber in a tunable passively Q-switched erbium doped fiber laser

RSC Advances ◽  
2018 ◽  
Vol 8 (45) ◽  
pp. 25592-25601 ◽  
Author(s):  
Harith Ahmad ◽  
Siti Aisyah Reduan ◽  
Norazriena Yusoff
Keyword(s):  
Thin Film ◽  
Nickel Oxide ◽  
Fiber Laser ◽  
Saturable Absorber ◽  
Oxide Nanoparticles ◽  
Nio Nanoparticles ◽  
Nickel Oxide Nanoparticles ◽  
Chloride Hexahydrate ◽  
Erbium Doped

Nickel oxide (NiO) nanoparticles prepared from a nickel(ii) chloride hexahydrate precursor are used to form a chitosan capped NiO nanoparticle thin film that serves as a saturable absorber in a passively Q-switched erbium doped fiber laser.

scholarly journals Synergic effects of the decoration of nickel oxide nanoparticles on silicon for enhanced electrochemical performance in LIBs

2020 ◽  
Vol 2 (2) ◽  
pp. 823-832
Author(s):  
Ujjwala V. Kawade ◽  
Sunil R. Kadam ◽  
Milind V. Kulkarni ◽  
Bharat B. Kale
Keyword(s):  
Electrochemical Performance ◽  
Nickel Oxide ◽  
Volume Expansion ◽  
Oxide Nanoparticles ◽  
Nio Nanoparticles ◽  
Nickel Oxide Nanoparticles ◽  
Effective Suppression ◽  
Enhanced Electrochemical Performance

Decoration of NiO nanoparticles on silicon confers enhanced stable capacity due to the effective suppression of the volume expansion of silicon in LIBs.

Synthesis of NiO Nanoparticles by Microwave Assisted and Molten Salts Methods

2016 ◽  
Vol 721 ◽  
pp. 71-75 ◽  
Author(s):  
Jānis Grabis ◽  
Gundega Heidemane ◽  
Aija Krūmiņa
Keyword(s):  
Nickel Oxide ◽  
Crystallite Size ◽  
Molten Salts ◽  
Urea Solution ◽  
Microwave Assisted Synthesis ◽  
Oxide Nanoparticles ◽  
Nio Nanoparticles ◽  
Nickel Oxide Nanoparticles ◽  
Microwave Assisted ◽  
Direct Formation

Nickel oxide nanoparticles were prepared via molten salts and microwave assisted synthesis from nickel nitrate and the parameters of obtained nanopowders were compared. NiO nanoparticles with crystallite size in the range of 6-8 nm have been prepared by combining microwave assisted treatment of Ni (NO3)2 and urea solution with calcination at 300-320 °C. Molten salts (NaNO2-NaCl) ensured direct formation of NiO from Ni (NO3)2.6H2O and salts mixture at 350 °C but crystallite size of the particles reached 51-69 nm.

Nickel Oxide Nanoparticles Doped Liquid Crystal System for Superior Electro-Optical Properties

2015 ◽  
Vol 15 (10) ◽  
pp. 8139-8143 ◽  
Author(s):  
Hak Moo Lee ◽  
Hyung-Koo Chung ◽  
Hong-Gyu Park ◽  
Hae-Chang Jeong ◽  
Jeong-Hwan Kim ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
Nickel Oxide ◽  
Polymer Surface ◽  
Oxide Nanoparticles ◽  
Screen Effect ◽  
Nio Nanoparticles ◽  
Nickel Oxide Nanoparticles ◽  
Liquid Crystal System ◽  
Nanoparticles Concentration

We examined the properties of nematic liquid crystal (N-LC) systems with dispersed nickel oxide nanoparticles (NPs). Uniform LC alignments with regular pretilt angles were achieved on rubbed polymer surface regardless of NiO nanoparticles concentration. We confirmed the electro-optical characteristics of twisted nematic (TN) cells containing NiO nanoparticles on rubbed polymer surface, which exhibited lower threshold voltages and faster response times with less capacitance hysteresis than pure LC cells. It is clear that the response time of TN cells on rubbed polymer surfaces decreases with increasing the NiO nanoparticles concentration. These results demonstrate the relationship between NP doping concentration and trapping of impurity ions, and were confirmed by a software simulation of electric flux and field density. NiO nanoparticles in the LC cells focused the electric field flux and strengthened the electric field. Further, NiO nanoparticles in LC medium trapped charged ionic impurities and suppressed the screen effect, leading to a stronger electric field and the van der Waals interactions between LC molecules and the alignment layers.

scholarly journals Poly(3-hydroxybutyrate)/poly(amine)-coated nickel oxide nanoparticles for norfloxacin delivery: antibacterial and cytotoxicity efficiency

RSC Advances ◽  
2020 ◽  
Vol 10 (56) ◽  
pp. 34046-34058
Author(s):  
Nehal Salahuddin ◽  
Mohamed Gaber ◽  
Maie Mousa ◽  
Mohamed A. Abdelwahab
Keyword(s):  
Nickel Oxide ◽  
Oxide Nanoparticles ◽  
Nio Nanoparticles ◽  
Nickel Oxide Nanoparticles

PHB/poly(amine)-coated NiO nanoparticles for NOR delivery: antibacterial and cytotoxicity efficiency.

Exploring the characteristics of the nickel oxide nanoparticles via Sol - gel method

2020 ◽  
Vol 3 (3) ◽  
Author(s):  
Jothi M ◽  
Sowmiya K
Keyword(s):  
Nickel Oxide ◽  
Ph Value ◽  
Lattice Structure ◽  
Sol Gel ◽  
Systematic Change ◽  
Average Crystalline Size ◽  
Nio Nanoparticles ◽  
Nickel Oxide Nanoparticles ◽  
X Ray ◽  
Vis Spectroscopy

Nickel Oxide (NiO) is an important transition metal oxide with cubic lattice structure. NiO is thermally stable that is suitable for tremendous applications in the field of optic, ceramic,glass, electro-chromic coatings, plastics, textiles, nanowires, nanofibers, electronics,energy technology, bio-medicine, magnetism and so on. In this present study, NiO nanoparticles were successfully synthesized by sol-gel technique. Nano-sols were prepared by dissolving Nickel-Chloride [NiCl2.6H2O] in NaOH solvent and were converted into nano structured gel on precipitation. A systematic change in preparation parameters like calcination temperature, time, pH value has been noticed in order to predict the influence on crystallite size. Then the prepared samples were characterized by the X-ray Diffraction Spectroscopic (XRD), UV-VIS Spectroscopy, Fourier Transform Infra-Red Spectroscopy (FTIR), Energy Dispersive X-ray Spectroscopy (EDX), Scanning Electron Microscopy (SEM) and Particle Size Analyzer (PSA). From XRD, the average crystalline-size has been calculated by Debye-Scherrer Equation and it was found to be 12.17 nm and the band gap energy of Nickel oxide (NiO) from UV studies reveals around 3.85 eV. Further, EDX and FTIR studies, confirm the presences of NiO nanoparticles. The SEM study exhibits the spherical like morphology of Nickel oxide (NiO). Further from PSA, the mean value of NiO nanoparticles has been determined.

TOXIC EFFECTS ASSESSMENT OF NICKEL OXIDE NANOPARTICLES BY INHALATION

2018 ◽  
pp. 24-29 ◽  
Author(s):  
B.A. Katsnelson ◽  
M.P. Sutunkova ◽  
L.I. Privalova ◽  
S.N. Solovjeva ◽  
V.B. Gurvich ◽  
...  
Keyword(s):  
Nickel Oxide ◽  
Redox Balance ◽  
Systemic Toxicity ◽  
Laboratory Animals ◽  
Oxide Nanoparticles ◽  
Nickel Oxide Nanoparticles ◽  
White Rats ◽  
Liver And Kidney ◽  
Stimulation Of Erythropoiesis ◽  
Nio Nps

The article presents in an experiment obtained principal results based on repeated low-level inhalation exposures of laboratory animals (white rats, outbred) to nickel oxide nanoparticles with a diameter of (23 ± 5) nm, 4 hours a day, 5 times a week for up to 10 months in a «nose only» installation. It was shown that non-specific body reactions to the action of NiO NPs include: diverse manifestations of systemic toxicity with a particularly pronounced influence on liver and kidney function, redox balance, damage to some areas of brain tissue, associated with proven movement of the nanoparticles themselves from the nasal mucosa along the olfactory tract; some cytological signs of probable development for allergic syndrome; paradoxically low severity of pulmonary pathology by pneumoconiotic type explained by a small chronic delay of nanoparticles in the lungs; the genotoxic effect of the organismal level, even at those low levels of chronic exposure, at which systemic toxicity is rather poorly. Along with that, NiO NPs also induce phase-stimulation of erythropoiesis, which is relatively specific for the toxic nickel effects.

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