Efficiency of dietary sodium alginate coating incorporated with lycopene in preserving rainbow trout

Ali Ehsani,Marzieh Paktarmani,Mohammad Yousefi 한국식품과학회 2017 Food Science and Biotechnology Vol.26 No.3

The main aim of this study was to investigate the effect of alginate coating without or with lycopene at levels of 0.5, 1, 1.5, and 3% on the quality of rainbow trout stored under refrigerated conditions for 16 days. Samples coated with alginate with or without lycopene showed significantly lower free fatty acid (FFA) and total volatile basic nitrogen (TVB-N) values compared to uncoated (control) filets, particularly after day 4. Moreover, significant differences (p\0.05) were observed between the coated samples containing lycopene and samples not containing lycopene on the last day. In relation with pH, none of the treatments resulted in significant differences. In regard to oxidation parameters, the effect of alginate-lycopene coatings was only seen on day 16 of storage. In general, although alginate- lycopene coating had no significant effect on the reduction of thiobarbituric acid and peroxide values, it succeeded in decreasing the TVB-N and FFA values.

Electrochemical Investigation of Inhibitory of New Synthesized 3-(4-Iodophenyl)-2-Imino-2,3-Dihydrobenzo[d]Oxazol-5-yl 4-Methylbenzenesulfonate on Corrosion of Stainless Steel in Acidic Medium

Ehsani, Ali,Moshrefi, Reza,Ahmadi, Maliheh The Korean Electrochemical Society 2015 Journal of electrochemical science and technology Vol.6 No.1

3-(4-Iodophenyl)-2-imino-2,3-dihydrobenzo[d]oxazol-5-yl 4-methylbenzenesulfonate (4-IPhOXTs) was synthesized and its inhibiting action on the corrosion of stainless steel 316L (SS) in sulfuric acid was investigated by means of potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results of the investigation show that this compound has excellent inhibiting properties for SS corrosion in sulfuric acid. Inhibition efficiency increases with increase in the concentration of the inhibitor. The adsorption of 4-IPhOXTs onto the SS surface followed the Langmuir adsorption model with the free energy of adsorption ΔG⁰_ads of −8.45 kJ mol⁻¹ . Quantum chemical calculations were employed to give further insight into the mechanism of inhibition action of 4-IPhOXTs.

Electrochemical and quantum chemical investigation of inhibitory of 1,4-Ph(OX)2(Ts)2 on corrosion of 1005 aluminum alloy in acidic medium

Ali Ehsani,Mahmoud Nasrollahzadeh,Mohammad Ghasem Mahjani,Reza Moshrefi,Hossein Mostaanzadeh 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6

The 3,30-(1,4-phenylene)bis(2-imino-2,3-dihydrobenzo[d]oxazole-5,3-iyl)bis(4-thylbenzenesulfonate)(1,4-Ph(OX)2(Ts)2) was synthesized and its inhibiting action on the corrosion of 1005 aluminum alloy(Al) in sulphuric acid was investigated by means of potentiodynamic polarization and electrochemicalimpedance spectroscopy (EIS). In the potentiodynamic polarization measurements the values of bc hadsmall changes with increasing inhibitor concentration, which indicated that the 1,4-Ph(OX)2(Ts)2 wasadsorbed on the metal surface and the addition of the inhibitor hindered the acid attack on the Alelectrode. In anodic domain, the value of ba decreases with the presence of 1,4-Ph(OX)2(Ts)2. The shift inthe anodic Tafel slope ba might be attributed to the modification of anodic dissolution process due to theinhibitor modules adsorption on the active sites. The inhibition efficiencies were obtained from weightloss measurement and electrochemical tests. The adsorption of 1,4-Ph(OX)2(Ts)2 onto the Al surfacefollowed the Langmuir adsorption model with the free energy of adsorption -△G0ads of -5.13 kJ mol1. Quantum chemical calculations were employed to give further insight into the mechanism of inhibitionaction of 1,4-Ph(OX)2(Ts)2.

Pressureless sintering of SiC matrix composites reinforced with nano-β-SiC and graphene

Razmjoo Ali,Baharvandi Hamid Reza,Ehsani Nasser 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.5

Silicon carbide (SiC) is an effective material for high-temperature engineering applications owing to its desirable properties such as high elastic modulus, high hardness, and melting temperature, high thermal conductivity, good corrosion and oxi- dation resistance, low density, and coefficient of thermal expansion compared with other advanced ceramics. Nevertheless, poor sinterability and low toughness limit its use, which can be overcome using appropriate additives. In this study, the eff ect of different amounts of nano-β-SiC (0, 5, 10, and 15 wt.%) and graphene (0, 1, 2, and 3 wt.%) particles on the sinterability behavior and microstructure of SiC composite has been investigated. After weighing, dispersing nano-β-SiC and graphene, and mixing the starting materials, milling was carried out at 180 rpm for 3 h. The materials obtained were then compressed uniaxially under a pressure of 75 MPa and then were compressed again through CIP under 150 MPa. To remove volatile products, the pyrolysis process was performed at 800 °C under Ar atmosphere. Finally, the samples were sintered at 2200 °C for 2 h by the pressureless sintering process. XRD analysis was used to investigate the phases and FESEM images were used to study the microstructure. According to the XRD patterns, β-SiC particles were converted to α-SiC, which was accompa- nied by the elongation of SiC grains. Also, no reaction was observed between graphene and the SiC matrix. According to the FESEM images, the samples containing 5 wt.% nano-β-SiC and 1 wt.% graphene showed a uniform distribution of rein- forcement particles but with increasing the amount of the reinforcement particles, agglomeration was observed. According to the results, upon increasing the nano-β-SiC up to 5 wt% and graphene up to 1 wt.%, all the measured properties including relative density, and linear shrinkage improved and reached 99.04%, and 18.01%, respectively. However, with increasing the additives, these properties deteriorated due to increasing porosity and agglomeration in the composite structure.

A comprehensive review of membrane fouling and cleaning methods with emphasis on ultrasound-assisted fouling control processes

Masoume Ehsani,Huu Doan,Ali Lohi 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.8

One of the most critical issues encountered in membrane-based separation processes is permeate flux decline in a system operating for a long period. The particles in the feed solution tend to foul the membrane surface or membrane pores, which results in pore blocking and/or cake formation on the surface. In this regard, the use of membrane cleaning techniques for the membrane flux restoration has gained more attention. Ultrasonic (US) irradiation is an alternative technique applied to the feed solution passing across the membrane surface to either prevent the fouling formation (fouling control) or dislodge the foulants (surface cleaning). Ultrasonic cleaning mechanisms are based on sound waves travelling through the liquid, which leads to physical and chemical effects. This cleaning technique is an environmentally friendly process in which no chemical or biological agents are used. This article briefly reviews different types of fouling and classes of foulants, fouling evolution mechanisms, mathematical modelling of fouling, surface cleaning and fouling control strategies, with the emphasis on ultrasound-assisted fouling control process as an innovative cleaning method. The effect of the operational parameters on the performance of the US-assisted filtration processes, highlights, challenges, and future outlook of US cleaning will be discussed.

Nanostructured Metal Organic Framework Modified Glassy Carbon Electrode as a High Efficient Non-Enzymatic Amperometric Sensor for Electrochemical Detection of H₂O₂

Naseri, Maryam,Fotouhi, Lida,Ehsani, Ali The Korean Electrochemical Society 2018 Journal of electrochemical science and technology Vol.9 No.1

Metal-organic frameworks have recently been considered very promising modifiers in electrochemical analysis due to their unique characteristics among which tunable pore sizes, crystalline ordered structures, large surface areas and chemical tenability are worth noting. In the present research, $Cu(btec)_{0.5}DMF$ was electrodeposited on the surface of glassy carbon electrode at room temperature under cathodic potential and was initially used as the active materials for the detection of $H_2O_2$. The cyclic voltammogram of $Cu(btec)_{0.5}DMF$ modified GC electrode shows distinct redox peaks potentials at +0.002 and +0.212 V in 0.1 M phosphate buffer solution (pH 6.5) corresponding to $Cu^{(II)}/Cu^{(I)}$ in $Cu(btec)_{0.5}DMF$. Acting as the electrode materials of a non-enzymatic $H_2O_2$ biosensor, the $Cu(btec)_{0.5}DMF$ brings about a promising electrocatalytic performance. The high electrocatalytic activity of the $Cu(btec)_{0.5}DMF$ modified GC electrode is demonstrated by the amperometric response towards $H_2O_2$ reduction with a wide linear range from $5{\mu}M$ to $8000{\mu}M$, a low detection limit of $0.865{\mu}M$, good stability and high selectivity at an applied potential of -0.2 V, which was higher than some $H_2O_2$ biosensors.

Physioelectrochemical Investigation of Electrocatalytic Activity of Modified Carbon Paste Electrode in Alcohol Oxidation as Anode in Fuel Cell

Javad Shabani-Shayeh,Ali Ehsani,Majid Jafarian 한국전기화학회 2014 한국전기화학회지 Vol.17 No.3

Methanol electro oxidation on the surface of carbon paste modified by NiCl2/6H2Owas studied in 1M NaOH by potentiostatic and potentiodynamic methods. Ni/C catalyst bythe concentration of 5% Ni showed about twice higher electro catalytic activity than Ni metal. The amount of monolayer’s on the surface of electrode is almost one order higher for Ni/Cthan Ni electrode. The kinetic parameters and the diffusion coefficient of methanol were derivedfrom chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS) measurements

Physioelectrochemical Investigation of Electrocatalytic Activity of Modified Carbon Paste Electrode in Alcohol Oxidation as Anode in Fuel Cell

Shabani-Shayeh, Javad,Ehsani, Ali,Jafarian, Majid The Korean Electrochemical Society 2014 한국전기화학회지 Vol.17 No.3

Methanol electro oxidation on the surface of carbon paste modified by $NiCl_2/6H_2O$ was studied in 1M NaOH by potentiostatic and potentiodynamic methods. Ni/C catalyst by the concentration of 5% Ni showed about twice higher electro catalytic activity than Ni metal. The amount of monolayer's on the surface of electrode is almost one order higher for Ni/C than Ni electrode. The kinetic parameters and the diffusion coefficient of methanol were derived from chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS) measurements.

Synthesis of Au/Pd bimetallic nanoparticles and their application in the Suzuki coupling reaction

Mahmoud Nasrollahzadeh,Abbas Azarian,Mehdi Maham,Ali Ehsani 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1

This communication reports on the synthesis and use of Au/Pd bimetallic nanoparticles, as separablecatalysts for ligand-free Suzuki coupling reactions. This method has the advantages of high yields,elimination of homogeneous catalysts, green reaction conditions, simple methodology and easy work up. Catalytic efficiency remains unaltered even after several repeated cycles. The catalyst was characterizedusing the SEM and EDS.

Immunohistochemical Evaluation of Angiogenesis Related Markers in Pyogenic Granuloma of Gingiva

Seyedmajidi, Maryam,Shafaee, Shahryar,Hashemipour, Golnarsadat,Bijani, Ali,Ehsani, Hodis Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.17

Background: Pyogenic granuloma is a common non-neoplastic connective tissue proliferation. ICAM-1 and VCAM-1 are vascular adhesion molecules and CD34 is a marker for evaluation of angiogenesis. The purpose of this study was to compare the immunohistochemical expression of ICAM-1, VCAM-1 & CD34 in oral pyogenic granuloma and normal gingiva. Materials and Methods: This study was performed on thirty five formalin-fixed, paraffin embedded samples of gingival pyogenic granuloma. Also we used thirty five paraffined blocks of normal gingiva as control group which were taken from crown lengthening surgery. We employed immunohistochemistry staining for our prepared microscopic slides using monoclonal mouse anti-human antibodies against ICAM-1 (CD54), VCAM-1 (CD106) and CD34. Slides were examined under light microscope and then the mean amount of stained vessels also known as microvascular density (MVD) in highly vascularized areas (hot spots) was measured. Paired t-test and repeated measures ANOVA were used to compare the difference between quantitative variables and Chi-square test for qualitative variables in different groups. Pearson correlation coefficient was used to compare relations between quantitative variables. P<0.05 was considered significant. Results: The mean of MVD for ICAM-1, VCAM-1 and CD34 was significantly higher in pyogenic granuloma than normal gingiva (p<0.001 & p<0.001 & p<0.001, respectively). Expression of CD34 in pyogenic granuloma was significantly higher than ICAM-1 and VCAM-1 (P<0.001). Besides, expression of ICAM-1 in normal gingiva, was significantly lower than two other markers (p<0.001). Conclusions: Regarding the results, it seems that ICAM-1, VCAM-1 and CD34 are useful biomarkers in evaluation of vascular and inflammatory lesions such as gingival pyogenic granuloma and the results indicate the role of these biomarkers in pathogenesis of oral pyogenic granuloma.