scholarly journals Electrochemical and thermal stability of Chocolate Brown HT food additive

2019 ◽  
Vol 25 (1) ◽  
pp. 89-96
Author(s):  
Bogdan Tutunaru ◽  
Adriana Samide ◽  
Cristian Neamtu ◽  
Ioana Prunaru
Keyword(s):  
Food Industry ◽  
Room Temperature ◽  
Great Accuracy ◽  
Food Additive ◽  
Constant Current ◽  
Electrochemical Degradation ◽  
Scanning Calorimetry ◽  
Fluoride Ions ◽  
Thermal Analyzer ◽  
Thermal Stability Of

Chocolate Brown HT (E155) food additive characterization, based on simultaneous thermogravimetry and differential scanning calorimetry (TG/DSC), was studied using a diamond thermal analyzer, Perkin Elmer. Studies on melting and pyrolysis behavior of E155 color food additive observed by TG/ /DTG indicate changes in its composition recorded through several steps of decreasing the mass of the sample. After heating the sample within the temperature range from the room temperature to 1000?C, a residue of 33% was observed at the end of the experiment. Thermal decomposition of E155 examined by DSC in an inert nitrogenous atmosphere was also used for predicting its stability. This analysis predicts with great accuracy the use of Chocolate Brown HT additive in the food industry or household use. Brown HT (E155) food additive characterization based on electrochemical methods was studied in the presence of different halide anions. By corroborating the data obtained by cyclic voltammetry and constant current electrolysis it has been observed that the electrochemical degradation efficiency of the BHT molecule has the highest value in the presence of bromide anions, and in the presence of fluoride ions has a minimum value.

STUDYING OF THE CERATONIA SILIQUE SEEDS SWELLING COEFFICIENT

1970 ◽  
pp. 26-28
Author(s):  
F. Duksi ◽  
V. V. Vandyshev ◽  
R. Mussa ◽  
R. Mokhamad ◽  
Е. N. Pakina
Keyword(s):  
Dairy Products ◽  
Food Industry ◽  
Room Temperature ◽  
Food Additive ◽  
Locust Bean Gum ◽  
Ceratonia Siliqua ◽  
Crete Island ◽  
Swelling Coefficient ◽  
Locust Bean ◽  
Different Origins

  The purpose of this work is to study the water-absorbing properties of the bean seed tissues of the wild Ceratonia siliqua population growing in Syria and cultivated on the Crete island (Greece) absorb water in a crushed state at room temperature. Сeratonia siliqua seeds endosperm accumulating polysaccharides from the group of galactomannans which is a material for the production of locust bean gum (food additive E410). It is used in the food industry as a thickener, stabilizer, in the manufacture of dairy products, ice cream, processed cheeses, sweets and soups, in the pharmaceutical industry for film emulsions, paints, varnishes, ceramics and glue production. In the available literature there are no data on the swelling ration (SR) of the seeds of Ceratonia siliqua. The researcher’s task is to establish the value of SR and study the swelling dynamics (SD) of crushed native seeds and parts (endosperm, embryos) isolated from seeds after their modification. SR was determined by the method of medicinal plant types analises containing mucus (mucilago). It was found that water absorption by crushed seeds and their parts, regardless of the Ceratonia growth place develops quite sharply and quickly. SR of crushed native seeds was 6.3-7.0. At the same time, the swelling of the Ceratonia seeds from Syria was more intense than that from Crete island. The SR level of the crushed parts isolated from modified seeds of different origins was the same: endosperm – 5.0, embryos – 3.5. The SR value of the crushed seeds in comparison with the SR of their individual parts turned out to be higher. The process of the endosperm swelling containing galactomannan polysaccharide was more vigorous than in the embryos.

scholarly journals Thermal Stability of Mg/TeO2 Priming Compositions

2021 ◽  
pp. X
Author(s):  
Xiang-run ZHAO ◽  
Nan YAN ◽  
Wu-si DAI ◽  
Yao-kun YE ◽  
Shi-xin JIN ◽  
...  
Keyword(s):  
Room Temperature ◽  
Thermal Environment ◽  
Ignition Time ◽  
Digital Cameras ◽  
Extreme Temperatures ◽  
Scanning Calorimetry ◽  
Output Pressure ◽  
Temperature Conditions ◽  
Thermal Stability Of ◽  
Function Time

The insensitive ignitors with magnesium/tellurium dioxide (Mg/TeO2) priming composition installed on the spacecraft will experience a harsh thermal environment. Therefore, it is necessary to verify their availability at extreme temperatures. Differential Scanning Calorimetry and Thermogravimetric Analysis (DSC-TGA) were used to analyze the reaction process of the Mg/TeO2 priming composition. The morphology change of the Mg/TeO2 priming composition after -70 ℃6d, room temperature, 165 ℃6d were analyze by digital cameras, scanning electron microscope (SEM), as well as the output pressure, ignition time, function time and firing sensitivity of the Mg/TeO2 priming composition under three temperature conditions were tested. The results show that in a temperature range of -70 ℃ ~ 165 ℃, the temperature conditions have an effect on the output pressure less than 5%, the influence of high temperature conditions on ignition/ function time and sensitivity is greater than low temperature. It can be used as a priming composition for insensitive ignitors at -70 ℃ ~ 165 ℃.

scholarly journals Electrochemical and Thermal Stability of Nystatin Drug

2019 ◽  
Vol 70 (2) ◽  
pp. 503-505
Author(s):  
Simona Iordache ◽  
Bogdan Tutunaru ◽  
Adriana Samide ◽  
Alexandru Popescu
Keyword(s):  
Thermal Stability ◽  
Saline Solution ◽  
Constant Current ◽  
Platinum Electrodes ◽  
Electrochemical Degradation ◽  
Flow Curves ◽  
Constant Current Density ◽  
Copper Electrodes ◽  
Maximum Value ◽  
Thermal Stability Of

The analysis of synthetic / residual drugs is very important due to their systemic toxicity. Simple and rapid electrochemical degradation of nystatin drug was accomplished using constant current density electrolysis on platinum electrode. Electrochemical behavior of nystatin drug was investigated on different metallic electrodes by cyclic voltammetry. In saline solution, distinctive oxidation peak are observed on the lead and copper electrodes. The degree of electrochemical degradation reaches the maximum value of 100 % in 10 minutes on platinum electrodes. Thermal stability of nystatin drug was studied by simultaneous TG / DSC analysis. The thermogravimetric and heat flow curves indicated a relatively high stability up to 150 �C.

scholarly journals Mechanical Amorphization and Recrystallization of Mn-Co(Fe)-Ge(Si) Compositions

Metals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 534 ◽  
Author(s):  
Antonio Vidal-Crespo ◽  
Jhon J. Ipus ◽  
Javier S. Blázquez ◽  
Alejandro Conde
Keyword(s):  
Room Temperature ◽  
Crystal Size ◽  
Milling Time ◽  
Phase Evolution ◽  
Intermetallic Phases ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Bcc Phase ◽  
Thermal Stability Of

Mechanical alloying using a planetary ball mill allowed us to obtain two homogeneous systems formed by units with nanometer size and MnCo0.8Fe0.2Ge1−xSix stoichiometry (x = 0 and 0.5). The phase evolution of the systems with the milling time was analyzed using X-ray diffraction. Thermal stability of the final products was studied using differential scanning calorimetry. Room temperature 57Fe Mössbauer spectroscopy was used to follow the changes in the Fe environments. A paramagnetic Co-based amorphous phase developed in both alloys as milling progressed. However, while the presence of Si stabilized the Mn-type phase, mechanical recrystallization was observed in a Si-free composition leading to the formation of a MnCo(Fe)Ge intermetallic (Pnma space group) with a crystal size of 7 ± 1 nm. Mössbauer results indicate that Fe atoms migrate from the initial bcc phase to the amorphous and intermetallic phases.

scholarly journals Effect of chemical treatment on thermal properties of hair fiber-based reinforcement of HF/HDPE composites

2018 ◽  
Vol 25 (4) ◽  
pp. 807-815
Author(s):  
Prashant Srivastava ◽  
Shishir Sinha
Keyword(s):  
Thermal Stability ◽  
Thermogravimetric Analysis ◽  
Tensile Test ◽  
Alkali Treatment ◽  
Reinforced Composites ◽  
Scanning Calorimetry ◽  
Thermal Analyzer ◽  
Hair Fiber ◽  
Chemical Groups ◽  
Thermal Stability Of

Abstract The present study deals with the effects of fiber loading and alkali treatment (AT) on thermal behavior of a hair fiber (HF)-reinforced high-density polyethylene (HDPE) composite. The HF/HDPE-reinforced polymer composite has been prepared through a compression molding technique, which provided optimum thermal stability at 15 wt% of the fiber in the reinforced composite. The thermal stability of the composite has been investigated using a thermal analyzer [thermogravimetric analysis (TGA), derivative thermogravimetric analysis (DTG) and differential scanning calorimetry (DSC)]. The ATs of HF-reinforced composites have affected the thermal stability of the material, in which the observed optimum thermal stability is 0.25 N AT 15% HF/HDPE-reinforced composites. Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and tensile test played an important role in the study of the thermal stability of the material. FTIR analysis was used to investigate the chemical groups between the fiber and matrix. The morphology of the fiber is beneficial for the study of the surface treatment effect on the HF. The tensile test examined the optimum strength at 0.25 N AT 15% HF/HDPE composite, and a good relationship between the thermal and mechanical properties was also observed.

Thermal Stability of N-Heterocycle-Stabilized Iodanes – A Systematic Investigation

2019 ◽  
Author(s):  
Andreas Boelke ◽  
Yulia A. Vlasenko ◽  
Mekhman S. Yusubov ◽  
Boris Nachtsheim ◽  
Pavel Postnikov
Keyword(s):  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Thermogravimetric Analysis ◽  
Systematic Investigation ◽  
Scanning Calorimetry ◽  
Thermal Stability Of

<p>The thermal stability of pseudocyclic and cyclic <i>N</i>-heterocycle-stabilized (hydroxy)aryl- and mesityl(aryl)-l<sup>3</sup>-iodanes (NHIs) through thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) is investigated. NHIs bearing <i>N</i>-heterocycles with a high N/C-ratio such as triazoles show among the lowest descomposition temperatures and the highest decomposition energies. A comparison of NHIs with known (pseudo)cyclic benziodoxolones is made and we further correlated their thermal stability with reactivity in a model oxygenation. </p>

Reducing the Ecotoxicity of Pesticide Polluted Waters by Electrochemical Methods

2019 ◽  
Vol 70 (5) ◽  
pp. 1574-1578
Author(s):  
Cristian Neamtu ◽  
Bogdan Tutunaru ◽  
Adriana Samide ◽  
Alexandru Popescu
Keyword(s):  
Nitrogen Atmosphere ◽  
Constant Current ◽  
Polluted Water ◽  
Gaseous Nitrogen ◽  
Constant Current Density ◽  
Electrochemical Approach ◽  
Saline Waters ◽  
Thermal Combustion ◽  
Polluted Waters ◽  
Thermal Stability Of

Electrochlorination constitutes an electrochemical approach for the treatment of pesticide-containing wastewaters. This study evaluated the electrochemical and thermal stability of four pesticides and the efficiency of electrochlorination to remove and detoxify the simulated polluted water with: Acetamiprid, Emamectin, Imidacloprid and Propineb. This study reports the experimental results obtained by cyclic voltammetry and electrolysis at constant current density in association with UV-Vis spectrophotometry. In saline waters this pesticides are electrochemical active and anodic peaks are registered in the corresponding voltammograms. After thermal combustion, in a gaseous nitrogen atmosphere, a residue ranging from 15 to 45 % is observed at 500 �C.

Mechanical and thermal characterization of grafted PP-NCC nanocomposites

2019 ◽  
pp. 089270571987822
Author(s):  
Saud Aldajah ◽  
Mohammad Y Al-Haik ◽  
Waseem Siddique ◽  
Mohammad M Kabir ◽  
Yousef Haik
Keyword(s):  
Thermal Properties ◽  
Interfacial Adhesion ◽  
Thermal Characterization ◽  
Mechanical And Thermal Properties ◽  
Screw Extruder ◽  
Scanning Calorimetry ◽  
Three Point Bending ◽  
Twin Screw ◽  
Thermal Stability Of

This study reveals the enhancement of mechanical and thermal properties of maleic anhydride-grafted polypropylene (PP- g-MA) with the addition of nanocrystalline cellulose (NCC). A nanocomposite was manufactured by blending various percentages of PP, MA, and NCC nanoparticles by means of a twin-screw extruder. The influence of varying the percentages of NCC on the mechanical and thermal behavior of the nanocomposite was studied by performing three-point bending, nanoindentation, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and Fourier-transform infrared (FTIR) spectroscopy tests. The novelty of this study stems on the NCC nanoparticles and their ability to enhance the mechanical and thermal properties of PP. Three-point bending and nanoindentation tests revealed improvement in the mechanical properties in terms of strength, modulus, and hardness of the PP- g-MA nanocomposites as the addition of NCC increased. SEM showed homogeneity between the mixtures which proved the presence of interfacial adhesion between the PP- g-MA incorporated with NCC nanoparticles that was confirmed by the FTIR results. DSC and TGA measurements showed that the thermal stability of the nanocomposites was not compromised due to the addition of the coupling agent and reinforced nanoparticles.

Star-shaped arylacetylene resins derived from silicon

2020 ◽  
Vol 40 (8) ◽  
pp. 676-684
Author(s):  
Niping Dai ◽  
Junkun Tang ◽  
Manping Ma ◽  
Xiaotian Liu ◽  
Chuan Li ◽  
...  
Keyword(s):  
High Performance ◽  
Room Temperature ◽  
Mechanical Test ◽  
Flexural Modulus ◽  
Mechanical Analysis ◽  
Reinforced Composites ◽  
Scanning Calorimetry ◽  
Chemical Structures ◽  
Structures And Properties ◽  
High Performance Resin

AbstractStar-shaped arylacetylene resins, tris(3-ethynyl-phenylethynyl)methylsilane, tris(3-ethynyl-phenylethynyl) phenylsilane, and tris (3-ethynyl-phenylethynyl) silane (TEPHS), were synthesized through Grignard reaction between 1,3-diethynylbenzene and three types of trichlorinated silanes. The chemical structures and properties of the resins were characterized by means of nuclear magnetic resonance, fourier-transform infrared spectroscopy, Haake torque rheomoter, differential scanning calorimetry, dynamic mechanical analysis, mechanical test, and thermogravimetric analysis. The results show that the melt viscosity at 120 °C is lower than 150 mPa⋅s, and the processing windows are as wide as 60 °C for the resins. The resins cure at the temperature as low as 150 °C. The good processabilities make the resins to be suitable for resin transfer molding. The cured resins exhibit high flexural modulus and excellent heat-resistance. The flexural modulus of the cured TEPHS at room temperature arrives at as high as 10.9 GPa. Its temperature of 5% weight loss (Td5) is up to 697 °C in nitrogen. The resins show the potential for application in fiber-reinforced composites as high-performance resin in the field of aviation and aerospace.

scholarly journals The effect of polyhedral oligomeric silsesquioxanes (POSSs) incorporation in ethylene-propylene-diene-terpolymer (EPDM): a thermal study

2021 ◽  
Author(s):  
Ignazio Blanco ◽  
Traian Zaharescu
Keyword(s):  
Room Temperature ◽  
Thermal Characterization ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Dsc Analysis ◽  
Γ Irradiation ◽  
Scanning Calorimetry ◽  
Ethylene Propylene ◽  
Oligomeric Silsesquioxane ◽  
Ethylene Propylene Diene Terpolymer ◽  
Dynamic Heating

AbstractA series of ethylene-propylene-diene-terpolymer (EPDM)/polyhedral oligomeric silsesquioxane (POSS) composites at different percentage of POSS were prepared and subjected to γ-irradiation. Both irradiated and non-irradiated EPDM and composites were investigated by the means of thermal analysis to verify if the presence of POSS molecules is able to reduce the oxidation level of free radicals generated during the degradation and to evaluate the effects of the irradiation. EPDM composites at 1, 3 and 5 mass% of POSS were thus degraded in a thermogravimetric (TG) balance in dynamic heating conditions (25–700 °C), in both inert and oxidative atmosphere by flowing nitrogen and air respectively. Thermal characterization was then completed by carrying out Differential Scanning Calorimetry (DSC) analysis from sub-ambient to better highlight the melting of the polymer and polymer composites occurring just above the room temperature. FTIR spectroscopy was also performed for the prepared samples to check the presence of the molecular filler in the composites and for the TG’s residue at 700 °C, in order to evaluate its nature. DSC and TGA parameters were detected and discussed to have information about the effect of the degradation’s environment, the effect of irradiation on polymer stabilization and the effect of POSS content in the polymer matrix.

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