Improving the Chemical Stability of BaCe0.9Y0.1O3-d (BCY10) Towards Humidification and Carbonation By Microstructural Design

Background and Aim: Extending the shelf life of foods is an essential concept in food safety. Most of the time, foods deteriorate through the growth of microorganisms or oxidation process. Essential oils (EOs) derived from plant material have well-documented antioxidant and antibacterial activity. This study aimed to evaluate the effect of Zataria multiflora Boiss EO (ZEO) and Mentha piperita EO (MEO) on the chemical stability of minced meat during storage at 7°C. Materials and Methods: Total phenolic content, β-Carotene bleaching test, ferric reducing antioxidant potential assay, and 2,2-Diphenyl-1-picrylhydrazyl radical scavenging activity were used to determine the antioxidant potential of EOs. Five different groups including control, ZEO 0.3%, ZEO 0.5%, MEO 0.3%, and MEO 0.5% were designed to assess the chemical stability of minced meat by measuring pH, thiobarbituric acid (TBA), total volatile base nitrogen (TVBN), and peroxide value (PV). Results: pH did not have any significant change during storage. TBA values in the control group were significantly higher than the treatment groups, especially from the 5th day of storage. TVBN in the treatment group was significantly lower than the control group during storage. PV values in the treatment group were significantly lower than the control group during storage. Conclusion: Results indicate that ZEO and MEO had an excellent antioxidant activity and retarded the spoilage process in minced meat. Keywords: antioxidant, Mentha piperita, minced meat, Zataria multiflora Boiss.

Download Full-text

Microstructural Design of an AlMgSi Alloy via ECAP Processing: An Advanced SPD Manufacturing Technique for NC/UFG Materials

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1114.143 ◽

2015 ◽

Vol 1114 ◽

pp. 143-148

Author(s):

Nicolae Serban ◽

Doina Răducanu ◽

Vasile Danut Cojocaru ◽

Nicolae Ghiban

Keyword(s):

Plastic Deformation ◽

Severe Plastic Deformation ◽

Grain Refinement ◽

Shape Change ◽

Large Strain ◽

Metallographic Analysis ◽

Cross Sectional ◽

Ecap Processing ◽

Microstructural Design ◽

Almgsi Alloy

Severe plastic deformation (SPD) has received enormous interest over the last two decades as a method capable of producing fully dense and bulk ultra-fine grained (UFG) and nanocrystalline (NC) materials. Significant grain refinement obtained by SPD leads to improvement of mechanical, microstructural and physical properties. Compared to classical deformation processes, the big advantage of SPD manufacturing techniques, represented in particular by equal channel angular pressing (ECAP) is the lack of shape-change deformation and the consequent possibility to impart extremely large strain. In ECAP processing, the workpiece is pressed through a die in which two channels of equal cross-section intersect at an angle of ϕ and an additional angle of ψ define the arc of curvature at the outer point of intersection of the two channels. As a result of pressing, the sample theoretically deforms by simple shear and retains the same cross-sectional area to allow repeated pressings for several cycles. A commercial AlMgSi alloy was investigated in our study. The specimens were processed at room temperature for multiple passes, using three different ECAP dies. All samples (ECAP processed and as-received) were subjected to metallographic analysis and mechanical testing. Several correlations between the main processing parameters and the resulting microstructural aspect and mechanical features for the processed material were established. It was shown that severe plastic deformation by means of ECAP processing can be used in aluminum alloys microstructural design as an advanced tool for grain refinement in order to attain the desired microstructure and mechanical properties.

Download Full-text

A matrix targeted fluorescent probe to monitor mitochondrial dynamics

Organic & Biomolecular Chemistry ◽

10.1039/d0ob02128h ◽

2021 ◽

Author(s):

Madhu Ramesh ◽

Kolla Rajasekhar ◽

Kavya Gupta ◽

Vardhaman Babagond ◽

Deepak Kumar Saini ◽

...

Keyword(s):

Fluorescent Probe ◽

Chemical Stability ◽

Mitochondrial Dynamics ◽

Mitochondrial Matrix ◽

Turn On

A far-red turn-on fluorescent probe (Mito-TG) with excellent biocompatibility, photostability, chemical stability targets mitochondrial matrix. The insensitivity of probe under different pH and ROS enabled tracking of mitophagy and Aβ induced mitochondrial dynamics.

Download Full-text

Solvothermal Preparation of Spherical Bi2O3 Nanoparticles Uniformly Distributed on Ti3C2Tx for Enhanced Capacitive Performance

Nanoscale Advances ◽

10.1039/d1na00443c ◽

2021 ◽

Author(s):

Tao Li ◽

Xuefeng Chang ◽

Lifang Mei ◽

Xiayun Shu ◽

Jidong Ma ◽

...

Keyword(s):

Electrical Conductivity ◽

Chemical Stability ◽

Layered Structure ◽

Layered Material ◽

Two Dimensional ◽

Capacitive Performance ◽

Solvothermal Preparation

Ti3C2Tx is a promising new two-dimensional layered material for supercapacitors with good electrical conductivity and chemical stability. However, Ti3C2Tx has problems such as collapse of the layered structure and low...

Download Full-text

Chemical stability of oil-infused polyethylene

Journal of Biomaterials Applications ◽

10.1177/0885328220977353 ◽

2020 ◽

pp. 088532822097735

Author(s):

Fedra P Zaribaf ◽

Harinderjit S Gill ◽

Elise C Pegg

Keyword(s):

Vitamin E ◽

Chemical Stability ◽

Antioxidant Properties ◽

Oxidation Stability ◽

Thermal Ageing ◽

Similar Process ◽

Mechanical Degradation ◽

Suitable Material ◽

Thermally Treated

Ultra-high molecular weight polyethylene (UHMWPE) can be made radiopaque for medical imaging applications through the diffusion of an iodised oil-based contrast agent (Lipiodol Ultra Fluid). A similar process is used for Vitamin E incorporated polyethylene which provides antioxidant properties. This study aimed to investigate the critical long-term properties of oil-infused medical polyethylene after 4 weeks of accelerated thermal ageing. Samples treated with an oil (Vitamin E or Lipiodol) had a higher oxidation stability than currently used medical grade polyethylene, indicated by a smaller increase in oxidation index after ageing (Vitamin E + 36%, Lipiodol +40%, Untreated +136%, Thermally treated +164%). The tensile properties of oil treated polyethylene after ageing were significantly higher than the Untreated and Thermally treated controls (p<0.05) indicating less mechanical degradation. There was also no alteration in the percentage crystallinity of oil treated samples after ageing, though the radiopacity of the Lipiodol treated samples reduced by 54% after ageing. The leaching of oil with time was also investigated; the leaching of Lipiodol and Vitamin E followed the same trend and reached a steady state by two weeks. Overall, it can be concluded that the diffusion of an oil-based fluid into polyethylene not only increases the oxidative and chemical stability of polyethylene but also adds additional functionality (e.g. radiopacity) providing a more suitable material for long–term medical applications.

Download Full-text