Publications by authors named "Abdolreza Samimi"

9 Publications

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Forward osmosis dewatering of seawater and pesticide contaminated effluents using the commercial fertilizers and zinc-nitrate blend draw solutions.

Sci Total Environ 2022 May 22;820:153376. Epub 2022 Jan 22.

Department of Chemical Technologies, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran.

Fertilizer driven forward osmosis (FDFO) process would be feasible due to the possible prevention of the drainage of dewatered and concentrated pesticide effluent from agricultural pesticide industries to the environment. Instead, it would be possible to return the concentrated pesticide solution to the processing cycle, and on the other hand, employ directly the obtained diluted fertilizer draw solution for irrigation. This study investigated the performance of zinc-nitrate/amino-acids blends as fertilizer type draw solution, and distilled water, saline water (seawater), and synthetic wastewater containing pesticides as feed. The results indicated that the synergetic effect of blended type fertilizer presented significantly higher osmotic pressure and water flux than the sum of their individual ones, especially when the amount of amino acid increased. Conversely, an ignorable reverse flux of blended fertilizer draw solute was observed. The fertilizer blend with a molar ratio of 1:6 zinc-nitrate/amino-acid achieved the higher average fluxes of 34.7 and 23.92 L/mh from distilled and saline waters compared to common draw solutions such as metal salts. Furthermore, the FDFO exhibited a high rejection (over 99%) of bentazon and imidacloprid in feed solutions compared to other agricultural pesticides due to their larger molecular weight and molecular size. The applied FDFO represented a significant reduction in specific energy consumption (from 0.17 to 0.049 kWh/m) in a bench-scale setup as compared to the RO process almost at the same water permeation flux and the rejection of bentazon.
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http://dx.doi.org/10.1016/j.scitotenv.2022.153376DOI Listing
May 2022

A mesoporous melamine/chitosan/activated carbon biocomposite: Preparation, characterization and its application for Ni (II) uptake via ion imprinting.

Int J Biol Macromol 2021 Oct 8;188:126-136. Epub 2021 Aug 8.

Chemistry Department, University of Zanjan, Koushkan road, Zanjan, Iran.

A novel imprinted biocomposite and its non-imprinted form were developed by melaminating and crosslinking of chitosan coated onto a bio-based activated carbon and characterized using FTIR, BET, FESEM-EDS and XRD. Nickel, 4-Toluenesulfonyl chloride, and glutaraldehyde were used as a template, converter of hydroxyl and amine groups to good leaving groups, and cross-linker, respectively. The factors affecting adsorptivity and imprinting factor were optimized by using the Taguchi method for the subsequent comparative adsorptivity, kinetics, isotherms, selectivity, and reusability studies of imprinted biocomposite with its non-imprinted one. The pseudo-first-order and Langmuir models were best fitted to the experimental kinetics and equilibrium isotherm data, respectively. The maximum Ni (II)) adsorptivity of 109.86 mg/g, the imprinting factor (I·F) of 5.45 and Ni (II) selectivity coefficients values of 3.13, 4.48, 3.72, 2.51 for Ni (II) toward Zn (II), Cd (II), Cu (II) and Pb (II), respectively, were obtained at optimum conditions. After five consecutive adsorption-desorption cycles, the biocomposites still presented a high adsorptivity (>83%), indicating their excellent reusability.
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http://dx.doi.org/10.1016/j.ijbiomac.2021.08.020DOI Listing
October 2021

Fabrication and characterization of conductive polypyrrole/chitosan/collagen electrospun nanofiber scaffold for tissue engineering application.

Int J Biol Macromol 2021 Jan 9;168:175-186. Epub 2020 Dec 9.

School of Chemical and Petroleum Engineering, Shiraz University, Shiraz 7134851154, Iran.

Conductive electrospun nanofiber scaffold containing conductive polypyrrole (PPy) polymer was fabricated to accelerate healing of damaged tissues. In order to prepare these scaffolds, various weight percentages of polypyrrole (5, 10, 15, 20, 25%) relative to the polymers combination (chitosan, collagen, and polyethylene oxide) were used. The fabricated composite scaffolds were characterized using chemical, morphological, physio-mechanical, and biological analyses including; FTIR spectroscopy, SEM, electrical conductivity, tensile test, in vitro degradation, MTT Assay and cell culture. The polypyrrole particles were perfectly dispersed inside the nanofibers, and the fibers average diameter were reducing by increasing the polypyrrole content in the composites. The presence of polypyrrole in fibers enhanced their conductivity up to 164.274 × 10 s/m which is in the range of semi-conductive and conductive polymers. MTT and SEM analyses displayed that nanofibers composing 10% polypyrrole possess better cell adhesion, growth and proliferation properties comparing to other compositions. Furthermore, the suitable mechanical properties of scaffolds ideally fitted them for different kinds of tissue applications including skin, nerve, heart muscle, etc. Therefore, these fabricated conductive nanofiber scaffolds are particularly appropriate for employing in body parts with electrical signals such as cardiovascular, heart muscles, or nerves.
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http://dx.doi.org/10.1016/j.ijbiomac.2020.12.031DOI Listing
January 2021

Fabrication and characterization of a novel compliant small-diameter PET/PU/PCL triad-hybrid vascular graft.

Biomed Mater 2020 07 15;15(5):055004. Epub 2020 Jul 15.

Chemical Engineering Department, University of Sistan and Baluchestan, Zahedan, Iran.

Nanomaterial structures are highly contributive in tissue engineering vascular scaffolds (TEVS) due to their ability to mimic the nanoscale dimension of the natural extracellular matrix (ECM) and the existing mechanical match between the native blood vessel and the scaffold as a vascular graft. The aim of this study was to develop and mechanically improve the nanofibrous triad-hybrid scaffolds with different composite ratios of polyethylene terephthalate (PET), polyurethane (PU), and polycaprolactone (PCL). The morphological, biological, mechanical, and biomechanical properties of the neat and hybrid structures were examined using scanning electron microscopy (SEM), differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), tensile strength, compliance, burst pressure, MTT assay, and by implanting the specimens under rat skin to explore the immune system in vivo. The results showed that the fiber diameter and porosity changes in the triad-hybrid electrospun scaffold ranged within 388 ± 88 to 547 ± 89 nm and 56.60 ± 2.06% to 75.00 ± 1.94%, respectively. In addition, the changes in the tensile strength and force in the scaffolds were within the ranges 2.7 ± 0.44 to 5.27 ± 0.83 MPa and 2.68 ± 0.19 to 10.03 ± 0.75 MPa, respectively. Also, the compliance and burst pressure of the structures were reported as 4.05 ± 0.21 to 7.09 ± 0.49 and 1623 ± 329 to 2560 ± 121 mmHg, respectively. According to the MTT assay, high cell viability was observed on the triad-hybrid structures with a high percentage of PET when compared to that of PU. The findings of this research demonstrate that the PET/PU/PCL triad-hybrid vascular scaffold has enough potential to be used in vascular tissue engineering application.
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http://dx.doi.org/10.1088/1748-605X/ab8743DOI Listing
July 2020

Effect of corrugated structure on the collapsing of the small-diameter vascular scaffolds.

J Biomater Appl 2020 05 8;34(10):1355-1367. Epub 2020 Mar 8.

Department of Chemical Engineering, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Islamic Republic of Iran.

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http://dx.doi.org/10.1177/0885328220910021DOI Listing
May 2020

The Role of Interleukin-4 and 13 Gene Polymorphisms in Allergic Rhinitis: A Case Control Study.

Rep Biochem Mol Biol 2019 Jul;8(2):111-118

Department of Laboratory Sciences, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran.

Background: Allergic Rhinitis (AR) is an IgE-mediated inflammatory disorder with high morbidity rates. The eitiology of this disease is understood to occur from a complex interaction between genetic and environmental factors. T helper type 2 cells have been shown to have a crucial role in atopic disease due to their production of the cytokines, intelukin and , involved in inflammation. Research has shown single nucleotide polymorphisms (SNP) of the and genes to be associated increased levels of IgE and with allergic diseases such as, allergic rhinitis, asthma, and atopic dermatitis. Specifically, the rs2243250 SNP of IL-4 and the rs20541 SNP of have been shown to be associated with AR.

Methods: A case-control study was designed to investigate the relationship between the two SNPs rs2243250 and rs20541 with the incidence of AR. The SNPs were examined in patients with AR and healthy controls (86 patients and 86 controls). Blood samples were collected and DNA was extracted to evaluate the SNPs by RFLP-PCR.

Results: Recessive analysis model of the gene (GG vs. AA+AG) revealed that the GG genotype was more common in AR patients (P=0.36) )OR=0.8 [81% CI 0.38-1.6]). For the gene (TC vs. TT+CC), the TC genotype was more common in AR patients (P = 0.0022)) OR=0.71 [60% CI 1.41-5.02]). Furthermore, in the IL-4 gene, the 590 T>C polymorphism had a significant association with AR. However, no association was found between AR and the rs20541 polymorphism.

Conclusion: Our findings suggest that the polymorphism (rs20541, Exo 4, G>A, Arg130Gln) and IL-4 polymorphism (rs2243250= C-590T, promoter, T>C) are co-associated with AR and sensitivity to aeroallergens. However, this study used a cohort of AR patients and healthy controls from the northeast of Iran. Given the influence of ethnicity and environment on genetics, further investigation is needed to elucidate the role of SNPs in and in AR among different populations.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6844616PMC
July 2019

Small-diameter vascular graft using co-electrospun composite PCL/PU nanofibers.

Biomed Mater 2018 08 6;13(5):055014. Epub 2018 Aug 6.

Chemical Engineering Department, University of Sistan and Baluchestan, Zahedan, Iran.

Small-diameter vascular scaffolds have been developed by a co-electrospinning method using polyethylene terephthalate (PCL) and elastic polytetrafluoroethylene (PU) as biopolymers with long degradation time. Although they possess favorable properties, individually these two polymers do not meet the requirements for the production of synthetic vascular scaffolds. The co-electrospinning method was adopted to develop and mechanically improve the composite PCL/PU vascular scaffolds. The morphological, mechanical and biological properties of these vascular scaffolds were evaluated through scanning electron microscopy, differential scanning calorimetry, Fourier transform infrared spectroscopy, compliance, tensile testing and MTT assay. The in vivo study of the vascular scaffolds was performed by implanting them on rat and sheep models. The compliance of the composite vascular scaffolds improved by up to 43% through an increased percentage of PU from 10%-90%. The obtained UTS of the scaffolds at 10%, 25%, 50%, 75% and 90% of PU were 4.7 ± 0.34, 3.4 ± 0.6, 4.8 ± 0.62, 2.2 ± 0.34 and 4.4 ± 1.9 MPa, respectively. The results of MTT assays indicated that the cell growth on the scaffolds was augmented when compared to the control, from day one to day seven. Mild edema, mild foreign-body granulomatous reaction and mild fibrosis were observed by pathology test as the side effects in the composite scaffold with 50% PCL. Doppler ultrasound and angiography images confirm that no aneurysm, thrombogenesis, neointimal hyperplasia or occlusion exist, and there is complete patency at the end of an eight month investigation. The fabricated composite vascular scaffolds provide appropriate mechanical and biological properties and clinical requirements, indicating their required potential to be applied as a small-diameter vascular graft.
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http://dx.doi.org/10.1088/1748-605X/aad4b5DOI Listing
August 2018

Engineering of oriented carbon nanotubes in composite materials.

Beilstein J Nanotechnol 2018 5;9:415-435. Epub 2018 Feb 5.

Department of Chemical Engineering, University of Sistan and Baluchestan, University Blvd., Zahedan 98167-45845, Iran.

The orientation and arrangement engineering of carbon nanotubes (CNTs) in composite structures is considered a challenging issue. In this regard, two groups of in situ and ex situ techniques have been developed. In the first, the arrangement is achieved during CNT growth, while in the latter, the CNTs are initially grown in random orientation and the arrangement is then achieved during the device integration process. As the ex situ techniques are free from growth restrictions and more flexible in terms of controlling the alignment and sorting of the CNTs, they are considered by some as the preferred technique for engineering of oriented CNTs. This review focuses on recent progress in the improvement of the orientation and alignment of CNTs in composite materials. Moreover, the advantages and disadvantages of the processes are discussed as well as their future outlook.
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http://dx.doi.org/10.3762/bjnano.9.41DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5815271PMC
February 2018

An experimental-numerical investigation on the effects of macroporous scaffold geometry on cell culture parameters.

Int J Artif Organs 2017 May 13;40(4):185-195. Epub 2017 Apr 13.

Giulio Natta Department of Chemistry, Materials and Chemical Engineering, Politecnico di Milano, Milan - Italy.

Introduction: Perfused bioreactors have been demonstrated to be effective in the delivery of nutrients and in the removal of waste products to and from the interior of cell-populated three-dimensional scaffolds. In this paper, a perfused bioreactor hosting a macroporous scaffold provided with a channel is used to investigate transport phenomena and culture parameters on cell growth.

Methods: MG63 human osteosarcoma cells were seeded on macroporous poly​(ε-caprolactone) scaffolds provided with a channel. The scaffolds were cultured in a perfused bioreactor and in static conditions for 5 days. Cell viability and growth were assessed while the concentration of oxygen, glucose and lactate were measured. An in silico, multiphysics, numerical model was set up to study the fluid dynamics and the mass transport of the nutrients in the perfused bioreactor hosting different scaffold geometries.

Results: The experimental and numerical results indicated that the specific cell metabolic activity in scaffolds cultured under perfusion was 30% greater than scaffolds cultured under static conditions. In addition, the scaffold provided with a channel enabled the shear stress to be controlled, the initial seeding density to be retained, and adequate mass transport and waste removal.

Conclusions: We show that the macroporous scaffold provided with a channel cultured in a macroscale bioreactor can be a robust reference experimental model system to systematically investigate and assess crucial culture parameters. We also show that such an experimental model system can be employed as a simplified "representative unit" to improve the performance of both perfused culture systems and hollow, fiber-integrated scaffolds for large-scale tissue engineering.
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http://dx.doi.org/10.5301/ijao.5000554DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6159852PMC
May 2017
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