Technological Processes for Obtaining Monolithic Polydisperse Protein-Base Systems

2018 ◽  
Vol 284 ◽  
pp. 133-138 ◽  
Author(s):  
S.A. Parshina ◽  
A.Yu. Sokolov ◽  
E.O. Savchenko
Keyword(s):  
Food Processing ◽  
Sustainable Use ◽  
Chemical Properties ◽  
Functional Materials ◽  
Structure And Properties ◽  
Natural Polymers ◽  
Technological Processes ◽  
Raster Electron Microscopy ◽  
Physical And Chemical ◽  
And Chemical Properties

This research addresses the challenges of sustainable use of natural polymers, including in technical fields. One of the leading trends in science and industry headway today lies in designing advanced functional materials, e.g. for manufacturing medical items, technical devices, food-processing tools et al. For this purpose, universally applicable technological processes are being developed, including in biotechnology. One of the main goals of this research is to explore ways to consolidate living systems, by instilling in them desirable physical and chemical properties so as to diversify their applications, including in technical fields. Polymers structure and properties have been investigated via raster electron microscopy, spectral analysis, et al.

scholarly journals Effects of pyrolysis parameters on the yield and properties of biochar from pelletized sunflower husk

2018 ◽  
Vol 44 ◽  
pp. 00197 ◽  
Author(s):  
Katarzyna Wystalska ◽  
Krystyna Malińska ◽  
Renata Włodarczyk ◽  
Olga Chajczyk
Keyword(s):  
Food Processing ◽  
Chemical Properties ◽  
Total Carbon ◽  
Physical And Chemical Properties ◽  
Wide Range ◽  
Agricultural Applications ◽  
Agriculture And Food ◽  
Pyrolysis Of Biomass ◽  
Physical And Chemical ◽  
And Chemical Properties

Pyrolysis of biomass residues from agriculture and food processing industry allows production of biochars with diverse physical and chemical properties for a wide range of applications in agriculture and environmental protection. Biochars produced from pelletized sunflower husks through slow pyrolysis in the range of temperatures (480–580°C) showed total carbon of 70.53%–81.96%, total nitrogen of 1.2%, alkaline pH (9.37–10.32), low surface area (0.93–2.91 m2 g-1) and porosity of 13.23–15.43%. Higher pyrolysis temperatures resulted in lower biochar yields. With the increase in temperature the content of organic matter, nitrogen, Ca and Mg decreased whereas the increase in temperature resulted in higher contents of total carbon and phosphorus. Produced biochars showed potential for agricultural applications.

The Structure and Properties of Some Urons and Thiourons

1969 ◽  
Vol 39 (2) ◽  
pp. 140-147 ◽  
Author(s):  
C. D. Egginton ◽  
C. P. Vale
Keyword(s):  
Nmr Spectroscopy ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Structure And Properties ◽  
Physical And Chemical ◽  
And Chemical Properties

A number of compounds containing the uron ring have been synthesized and their structures confirmed using nmr spectroscopy. Analogous compounds containing a thiouron ring derived from thiourea have also been prepared and similarly examined. The physical and chemical properties of these compounds have been studied. A number of them have been examined as bases for crease-resistant textile treatment.

scholarly journals Pepsinogen and Pepsin

1962 ◽  
Vol 45 (4) ◽  
pp. 57-76 ◽  
Author(s):  
Roger M. Herriott
Keyword(s):  
Chemical Properties ◽  
Protein Chain ◽  
Physical And Chemical Properties ◽  
Structure And Properties ◽  
Profound Change ◽  
Pepsinogen A ◽  
Close Proximity ◽  
Unique Manner ◽  
Physical And Chemical ◽  
And Chemical Properties

Evidence relating to the structure and properties of swine pepsinogen and pepsin has been reviewed and used to suggest a tentative two dimensional picture of the skeleton of these two proteins. When pepsinogen, a folded single peptide chain, is converted to pepsin, there is a profound change in the physical and chemical properties of the protein. In an as yet unknown manner, except that it is initiated by a peptic cleavage of the protein chain, a single enzymic site is formed. This site is made up, quite probably, of the secondary carboxyl group of glutamic acid or of aspartic acid and a tyrosine phenol group in close proximity so that they can form hydrogen or hydrophobic bonds with the substrate in some unique manner that permits hydrolysis to occur at an accelerated rate.

The Effect of Microwave on the Physical and Chemical Properties of Cassava Starch

2011 ◽  
Vol 396-398 ◽  
pp. 2083-2087 ◽  
Author(s):  
Ping Lan ◽  
Dong Xue Li ◽  
A Ming Chen ◽  
Li Hong Lan ◽  
Tao Xie ◽  
...  
Keyword(s):  
Infrared Spectrum ◽  
Renewable Resources ◽  
Chemical Properties ◽  
Basic Structure ◽  
Cassava Starch ◽  
Physical And Chemical Properties ◽  
Natural Polymers ◽  
Microwave Action ◽  
Physical And Chemical ◽  
And Chemical Properties

Starch is a kind of natural polymers and belongs to the renewable resources. Starch grain in the interior has crystallization area and non-crystalline area where the chemical reactions occur. In this paper, the effect of microwave cassava starch on the physical and chemical properties and characterizated by infrared spectrum and scan electrical microscope (SEM) was investigated. The transparency increase, the viscosity reduce and the anti-sedimentation enhanced after microwave action on tapioca starch. The result of infrared spectrum and scan electrical microscope shows that the original basic structure of cassava starch by microwave has not been damaged but the crystalline structure has been destroyed, which results in the reducing of the crystallinity of starch, the increasing of the contact area of particles and reaction reagents and the improving of the reaction activities .

scholarly journals Encapsulation of Fatty Oils into Electrospun Nanofibers for Cosmetic Products with Antioxidant Activity

2019 ◽  
Vol 9 (15) ◽  
pp. 2955 ◽  
Author(s):  
Aleksandra Miletić ◽  
Branimir Pavlić ◽  
Ivan Ristić ◽  
Zoran Zeković ◽  
Branka Pilić
Keyword(s):  
Mechanical Properties ◽  
Antioxidant Activity ◽  
Chemical Properties ◽  
Electrospun Nanofibers ◽  
Functional Materials ◽  
Electrospinning Technique ◽  
Active Compounds ◽  
Good Material ◽  
Physical And Chemical ◽  
And Chemical Properties

Active compounds derived from pomegranate and sea-buckthorn were encapsulated into polylactide (PLA-based fibers) and poly(vinyl-pirrolidone) (PVP-based fibers) nanofibers using electrospinning technique. The focus was on the antioxidant activity of prepared nonwovens. Morphology, thermal, and mechanical properties were also examined. Due to the different physical and chemical properties of the basic polymers, the obtained results indicate that PLA-based fibers have better antioxidant activity than PVP-based ones. All prepared samples were formed from bead-less continuous fibers networks, but in the case of PLA-based samples some small irregularities in the structure occurred. Mechanical properties were improved with the addition of active compounds in most of the cases, while thermal properties were slightly affected. Preserved antioxidant activity of active compounds by encapsulation and good material properties significant for manipulation, make these functional materials promising candidates for application in cosmetics.

scholarly journals Azulenoisoindigo: A Building Block for π-Functional Materials with Reversible Redox Behavior and Proton Responsiveness

2021 ◽  
Author(s):  
Bin Hou ◽  
Jing Li ◽  
Xiaodi Yang ◽  
Jianwei Zhang ◽  
Hanshen Xin ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Functional Materials ◽  
Redox Behavior ◽  
Paramagnetic Resonance ◽  
Cation Radicals ◽  
H Nmr ◽  
Reversible Redox ◽  
Physical And Chemical ◽  
Electron Paramagnetic ◽  
And Chemical Properties

<p>Azulene, one of representative nonbenzenoid aromatic hydrocarbons, exhibits unique molecular structure and distinctive physical and chemical properties. Herein, an azulene-based isoindigo analogue, azulenoisoindigo (<b>AzII</b>) is designed and synthesized, which has a twisted molecular backbone and R/S-isomers in single crystals. Interestingly, <b>AzII</b> shows the characteristics of both isoindigo and azulene, such as completely reversible redox behavior and reversible proton responsiveness. UV-vis-NIR, <sup>1</sup>H NMR and electron paramagnetic resonance (EPR) measurements were carried out to get insights into the possible mechanism of the proton-responsive property of <b>AzII</b>. The results demonstrated that only one azulenyl moiety of molecule of <b>AzII</b> was protonated and deprotonated, and the protonated <b>AzII</b> can be further oxidized to form azulenium cation radicals.</p>

scholarly journals Azulenoisoindigo: A Building Block for π-Functional Materials with Reversible Redox Behavior and Proton Responsiveness

2021 ◽  
Author(s):  
Bin Hou ◽  
Jing Li ◽  
Xiaodi Yang ◽  
Jianwei Zhang ◽  
Hanshen Xin ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Functional Materials ◽  
Redox Behavior ◽  
Paramagnetic Resonance ◽  
Cation Radicals ◽  
H Nmr ◽  
Reversible Redox ◽  
Physical And Chemical ◽  
Electron Paramagnetic ◽  
And Chemical Properties

<p>Azulene, one of representative nonbenzenoid aromatic hydrocarbons, exhibits unique molecular structure and distinctive physical and chemical properties. Herein, an azulene-based isoindigo analogue, azulenoisoindigo (<b>AzII</b>) is designed and synthesized, which has a twisted molecular backbone and R/S-isomers in single crystals. Interestingly, <b>AzII</b> shows the characteristics of both isoindigo and azulene, such as completely reversible redox behavior and reversible proton responsiveness. UV-vis-NIR, <sup>1</sup>H NMR and electron paramagnetic resonance (EPR) measurements were carried out to get insights into the possible mechanism of the proton-responsive property of <b>AzII</b>. The results demonstrated that only one azulenyl moiety of molecule of <b>AzII</b> was protonated and deprotonated, and the protonated <b>AzII</b> can be further oxidized to form azulenium cation radicals.</p>

CERAMICS BASED ON ORGANOSILICON POLYMERS-PRECURSORS: METHODS OF PREPARATION AND PROPERTIES (review)

2020 ◽  
pp. 76-92
Author(s):  
A.M. Shestakov ◽  
Keyword(s):  
Process Parameters ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Structure And Properties ◽  
Influence Of Process Parameters ◽  
Preceramic Polymers ◽  
Composition Structure ◽  
Physical And Chemical ◽  
And Chemical Properties ◽  
Organosilicon Polymers

The main types of preceramic organosilicon polymers, general methods of their synthesis and physical, and chemical properties are considered. Methods of shaping, curing and pyrolysis of polymers and the influence of process parameters on the composition, structure and properties of ceramics are described. Separately, the work considers modifying fillers for preceramic polymers, the goals and methods of their introduction into the polymer, the features of processing the compositions and the properties of the products obtained.

Nanoparticulate Functional Materials: Green Synthesis and Application for the Degradation of Phenolic Compounds

2012 ◽  
Vol 476-478 ◽  
pp. 1608-1611
Author(s):  
Feng Zhang
Keyword(s):  
Phenolic Compounds ◽  
Zinc Oxide Nanoparticles ◽  
Chemical Properties ◽  
Functional Materials ◽  
Oxide Nanoparticles ◽  
Physical And Chemical Properties ◽  
Nano Zno ◽  
Physical And Chemical ◽  
Zinc Acetate Precursor ◽  
And Chemical Properties

Zinc oxide nanoparticles was synthesized by microwave decomposition of zinc acetate precursor. Horseradish peroxidase (HRP) was immobilized on nano-ZnO. The catalytic activity, physical, and chemical properties of immobilized HRP as well as the interaction between HRP and nano-ZnO was studied. The Nano-ZnO immobilized HRP showed a better property in the thermostability, active pH stability. The Nano-ZnO is more effective than free HRP in the removal of many phenolic compounds. The results show that nano-ZnO is strong functional materials for envrionment protection.

Structure and Properties of Selected Zirconia Silicate Glasses

2008 ◽  
Vol 39-40 ◽  
pp. 173-176 ◽  
Author(s):  
Radovan Karell ◽  
Mária Chromčíková ◽  
Marek Liška
Keyword(s):  
Refractive Index ◽  
Chemical Properties ◽  
Molar Refraction ◽  
Chemical Durability ◽  
Silicate Glasses ◽  
Physical And Chemical Properties ◽  
Structure And Properties ◽  
Physical And Chemical ◽  
Compositional Series ◽  
And Chemical Properties

Viscosity, density, thermal expansion, glass transition temperature, refractive index, molar refraction, and chemical durability of selected compositional series of Na2O-K2O-ZnO-CaOZrO2- SiO2 glasses containing 1 and 3 mol. % ZrO2 were measured and interpreted according to the network-forming / -modifying activities of particular oxides. The influence of ZrO2 / SiO2, ZnO / CaO, and K2O / Na2O substitution on measured physical and chemical properties was discussed.

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