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  • 1.
    Knutsson, Sofie
    et al.
    Department of Chemistry, Umeå University.
    Kindahl, Tomas
    Department of Chemistry, Umeå University.
    Engdahl, Cecilia
    Department of Chemistry, Umeå University.
    Nikjoo, Dariush
    Department of Chemistry, Umeå University.
    Forsgren, Nina
    CBRN Defence and Security, Swedish Defence Research Agency.
    Kitur, Stanley
    Centre for Biotechnology Research and Development, Kenya Medical Research Institute.
    Ekström, Fredrik
    CBRN Defence and Security, Swedish Defence Research Agency.
    Kamau, Luna
    Centre for Biotechnology Research and Development, Kenya Medical Research Institute.
    Linusson, Anna
    Department of Chemistry, Umeå University.
    N-Aryl-N'-ethyleneaminothioureas effectively inhibit acetylcholinesterase 1 from disease-transmitting mosquitoes2017In: European Journal of Medicinal Chemistry, ISSN 0223-5234, E-ISSN 1768-3254, Vol. 134, p. 415-427Article in journal (Refereed)
    Abstract [en]

    Vector control of disease-transmitting mosquitoes by insecticides has a central role in reducing the number of parasitic- and viral infection cases. The currently used insecticides are efficient, but safety concerns and the development of insecticide-resistant mosquito strains warrant the search for alternative compound classes for vector control. Here, we have designed and synthesized thiourea-based compounds as non-covalent inhibitors of acetylcholinesterase 1 (AChE1) from the mosquitoes Anopheles gambiae (An. gambiae) and Aedes aegypti (Ae. aegypti), as well as a naturally occurring resistant-conferring mutant. The N-aryl-N’-ethyleneaminothioureas proved to be inhibitors of AChE1; the most efficient one showed submicromolar potency. Importantly, the inhibitors exhibited selectivity over the human AChE (hAChE), which is desirable for new insecticides. The structure-activity relationship (SAR) analysis of the thioureas revealed that small changes in the chemical structure had a large effect on inhibition capacity. The thioureas showed to have different SAR when inhibiting AChE1 and hAChE, respectively, enabling an investigation of structure-selectivity relationships. Furthermore, insecticidal activity was demonstrated using adult and larvae An. gambiae and Ae. aegypti mosquitoes.

  • 2. Nikjoo, Dariush
    Design and Synthesis of a Small Set of Thiourea-based Compounds as Inhibitors of AChE1 from Mosquitoes2014Other (Other academic)
  • 3.
    Nikjoo, Dariush
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
    Akhtar, Farid
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
    Porous polymeric membranes as CO2 adsorbents2017Conference paper (Refereed)
  • 4.
    Nikjoo, Dariush
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
    Akhtar, Farid
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
    Structured emulsion-templated porous copolymer based on photopolymerization for carbon capture2017In: Journal of CO2 Utilization, ISSN 2212-9820, E-ISSN 2212-9839, Vol. 21, p. 473-479Article in journal (Refereed)
    Abstract [en]

    Porous hydrogel copolymers of acrylamide (AAM) and acrylic acid (AAC) were structured in the form of monoliths and granules. AAM-co-AAC porous copolymer monoliths were synthesized using high internal phase emulsion (HIPE) as template and photopolymerization. For granulation, photopolymerization was used for the fabrication of the AAM-co-AAC hydrogel, which was subsequently freeze-granulated. The structural analysis (FTIR and XRD) confirmed the successful synthesis of hydrogel copolymers. The CO2 uptake capacity of structured AAM-co-AAC copolymers was evaluated through adsorption and absorption mechanisms by volumetric and gravimetric methods, respectively. The granules exhibited the CO2 adsorption uptake of 0.8 mmol g-1 at 25 kPa and 298 K. The CO2 and N2 adsorption data demonstrated that the hydrogel copolymers were selective for CO2. Furthermore, the granules were capable of capturing CO2 in the presence of water. The results of absorption of CO2 on water-swollen granules demonstrated that CO2-uptake capacity increases with increasing water content up to 1.8 mmol g-1.

  • 5.
    Nikjoo, Dariush
    et al.
    Department of Chemistry, Faculty of Engineering, Istanbul University, Avcilar, Istanbul .
    Aroguz, Ayse
    Department of Chemistry, Faculty of Engineering, Istanbul University, Avcilar, Istanbul .
    Dual responsive polymeric bionanocomposite gel beads for controlled drug release systems2017In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 134, no 33, p. 45143-Article in journal (Refereed)
    Abstract [en]

    Scientists are searching potential solutions for cancer treatments as well as ways to avoid the side effects of anti-cancer agents, via targeted drug delivery. The aim of this research is to propose dual responsive beads based on sodium alginate (SA), methylcellulose (MC), and magnetic iron oxide nanoparticles (MIONs) for controlled release of 5-Fluorouracil (5-FU) as model drug. The beads were prepared by the dual crosslinking of SA and MC in the presence of MIONs. The structural, thermal, morphological, magnetic characteristics as well as the release profile of 5-FU were studied. The characterization results showed that the drug molecules and MIONs were well dispersed in the polymeric matrix. The cumulative release percentage was ca. 80% at pH = 4.2 and 40% at pH = 7.2 after 6 h. Thus, the sensitivity of beads on the pH value was verified. Moreover, the release profile exhibited reduction with an increase in the concentration of MIONs under an external magnetic field. The obtained results confirmed the dual sensitive release of 5-FU (i.e., PH/magnetic) that can be used for the targeted and controlled drug delivery systems.

  • 6.
    Nikjoo, Dariush
    et al.
    Department of Chemistry, Faculty of Engineering, Istanbul University, Avcilar.
    Aroguz, Ayse
    Department of Chemistry, Faculty of Engineering, Istanbul University, Avcilar.
    Magnetic field responsive methylcellulosepolycaprolactonenanocomposite gels for targeted and controlled release of 5-Fluorouracil2016In: International Journal of Polymeric Materials, ISSN 0091-4037, E-ISSN 1563-535X, Vol. 65, no 8, p. 421-432Article in journal (Refereed)
    Abstract [en]

    5-Fluorouracil loaded magnetic field sensitive methylcellulose and polycaprolactone gels were prepared and characterized by FTIR, XRD, TGA, SEM, and VSM. Swelling analysis supplied important information on drug diffusion properties. The release profile of gels was investigated in different buffer solutions and the highest release values were observed at pH = 7.2. Release kinetic was analyzed using an empirical equation to clarify the transport properties of drug. The effects of nanoparticle concentration and applying external magnetic field were investigated on release profile. The results indicated that the drug release decreased by both, applying external magnetic field and increasing the concentration of Fe3O4 nanoparticles.

  • 7.
    Nikjoo, Dariush
    et al.
    Department of Chemistry, Faculty of Engineering, Istanbul University.
    Aroguz, Ayse Z.
    Department of Chemistry, Faculty of Engineering, Istanbul University.
    Viscometric Analysis of Miscibility and Interactions for Binary, Ternary Polycarbonate/Brominated Polystyrene + Chloroform Systems at Different Temperatures2013In: Journal of macromolecular science. Pure and applied chemistry (Print), ISSN 1060-1325, E-ISSN 1520-5738, Vol. 50, no 9, p. 1007-1011Article in journal (Refereed)
    Abstract [en]

    Viscosities of ternary systems consist of polycarbonate (PC)/brominated polystyrene (PBrS) in chloroform and their corresponding binary systems were measured at different temperatures (20, 25, and 30°C). All the measurements were carried out at the concentration ranges of 0.1–0.6 g·dL−1. The mass ratio of PC to PBrS was selected as 75:25, 50:50, and 25:75 in the ternary solutions. Two empirical expressions of Huggins and Kraemer equations with three-parameters were used for reproducing of the experimental viscosity data. The fitting parameters were obtained for the corresponding temperatures. The miscibility criteria on the basis of the sign of Δ[η]m based on the difference between experimental and ideal values of [η]m, was calculated by applying the Garcia et al., theoretical equation. The effect of temperature on the viscosity data was also studied. The results from this method were correlated with the miscibility data obtained for the same system by differential scanning calorimeter (DSC) findings.

  • 8.
    Nikjoo, Dariush
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
    Perrot, Virginie
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
    Akhtar, Farid
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
    Laminated Porous Diatomite Monoliths for Adsorption of Dyes From Water2019In: Environmental Progress & Sustainable Energy, ISSN 1944-7442, E-ISSN 1944-7450, Vol. 38, no s1, p. 377-385Article in journal (Refereed)
    Abstract [en]

    Structured laminated diatomite monoliths with superior mechanical properties were prepared by controlled freeze-casting of the aqueous suspensions of diatomite powders for wastewater treatment. The directional freezing of suspensions with solids loading of 25, 30, and 37 wt % at cooling from 0.5 to 5 K/min resulted in the formation of lamellar pores and solid walls with the thickness of 12–30 and 14–39 μm, respectively. The increase in solid loading and freezing rate resulted in refinement of the porous structure. Durable monoliths with the mechanical strength of 5.3 MPa were obtained by thermal treatment of the freeze-dried green bodies at 1,373 K. Diatomite monoliths with a pore size of 29.6 μm showed the removal of model dye pollutant Rhodamine B from water by adsorption and long-term water stability. The dye uptake capacity of monolith changed from 1.38 to 17.04 mg/g for the initial dye concentrations between 1.0 and 12.5 mg/L at 298 K and pH = 6, respectively. The adsorption data analysis using Lagergren's pseudo-first-order, pseudo-second-order, and intra-particle diffusion models revealed that diatomite monoliths offered efficient mass transfer in the porous laminated scaffold and to the adsorption sites and bulk diffusion of dye molecules in water was the rate-limiting mechanism for dye removal. © 2018 American Institute of Chemical Engineers Environ Prog, 2018.

  • 9.
    Velaga, Sitaram
    et al.
    Luleå University of Technology, Department of Health Sciences, Medical Science.
    Nikjoo, Dariush
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
    Rao Vuddanda, Parameswara
    Luleå University of Technology, Department of Health Sciences, Medical Science.
    Drying Kinetics of Polymeric Films: theoretical and experimental studies2016Conference paper (Refereed)
  • 10.
    Velaga, Sitaram
    et al.
    Luleå University of Technology, Department of Health Sciences, Medical Science.
    Nikjoo, Dariush
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
    Rao Vuddanda, Parameswara
    Luleå University of Technology, Department of Health Sciences, Medical Science. Department of Pharmaceutics, UCL School of Pharmacy, University College London.
    Experimental Studies and Modeling of the Drying Kinetics of Multicomponent Polymer Films2018In: AAPS PharmSciTech, ISSN 1530-9932, E-ISSN 1530-9932, Vol. 19, no 1, p. 425-435Article in journal (Refereed)
    Abstract [en]

    The process of drying thin polymer films is an important operation that influences the film structure and solid state, and the stability of the product. The purpose of this work was to study and model the drying kinetics of multicomponent films based on two polymers: hydroxypropyl methylcellulose (HPMC, amorphous) and polyvinyl alcohol (PVA, semicrystalline). The isothermal drying kinetics of the films at different temperatures (40, 60, and 80°C) were studied using thermo-gravimetric analysis (TGA) and convection oven methods. Solid-state characterization tools used in the study included polarization and hot-stage microscopy, scanning electron microscopy (SEM), and differential scanning calorimetry (DSC). The drying kinetics of HPMC and PVA films in the TGA apparatus and convection oven were comparable. The three-parameter (Wmax, τ, n) Hill equation successfully modeled the experimental drying kinetics. The time factor τ in the Hill equation nicely explained two drying phases in the films. Solid-state phase changes occurring in the films during dehydration had a bearing on the drying kinetics and mechanisms. TGA can be used as a simple tool to determine the end points in drying processes using ovens or tunnels. The three-parameter Hill equation explained the drying kinetics and diffusion mechanisms of the solvent through the polymer films for the first time. This study advances our understanding of film drying, in particular for pharmaceutically relevant thin films.

  • 11.
    Zafarani-Moattar, Mohammed Taghi
    et al.
    Physical Chemistry Department, University of Tabriz, Iran.
    Nikjoo, Dariush
    Physical Chemistry Department, University of Tabriz, Iran.
    Liquid−Liquid and Liquid−Liquid−Solid Equilibrium of the Poly(ethylene glycol) Dimethyl Ether 2000 + Sodium Sulfate + Water System2008In: Journal of Chemical and Engineering Data, ISSN 0021-9568, E-ISSN 1520-5134, Vol. 53, no 11, p. 2666-2670Article in journal (Refereed)
    Abstract [en]

    The phase diagram for the poly(ethylene glycol) dimethyl ether (PEGDE) + Na2SO4 + H2O system at 298.15 K using PEGDE with a molar mass of 2000 was determined. Compositions of the liquid−liquid and the liquid−liquid−solid equilibria were determined using calibration curves of refractive index of the solutions, and atomic absorption (AA) and X-ray diffraction analyses were made on the solids. The solid phase in equilibrium with the biphasic region was anhydrous Na2SO4. An empirical nonlinear three-parameter expression developed by Merchuk was used for reproducing the experimental binodal data at T = (288.15, 298.15, 308.15, and 318.15) K, and the fitting parameters were obtained for the corresponding temperatures. The effects of temperature on the binodal curve were also studied, and it was observed that the area of the biphasic region increased slightly with an increase in temperature. The experimental tie-line compositions at the aforementioned temperatures were fitted to both the Othmer−Tobias and Bancroft and Setschenow-type equations. Correlation coefficients for all equations are reported.

  • 12.
    Zafarani-Moattar, Mohammed Taghi
    et al.
    Physical Chemistry Department, Faculty of Chemistry (Excellence of Science for New Materials and Clean Chemistry), University of Tabriz, Iran.
    Nikjoo, Dariush
    Physical Chemistry Department, Faculty of Chemistry (Excellence of Science for New Materials and Clean Chemistry), University of Tabriz, Iran.
    Phase Diagrams for Liquid-Liquid and Liquid-Solid Equilibrium of the TernaryPoly(ethylene glycol) Dimethyl Ether 2000 + Sodium Carbonate + Water System2009In: Journal of Chemical and Engineering Data, ISSN 0021-9568, E-ISSN 1520-5134, Vol. 54, no 10, p. 2918-2922Article in journal (Refereed)
    Abstract [en]

    The complete phase diagram for the poly(ethylene glycol) dimethyl ether 2000 (PEGDME2000) + Na2CO3 + H2O system at 298.15 K was determined. Experimental liquid−liquid equilibrium phase diagrams, tie lines, and plait points were obtained for the ternary system. Compositions of the liquid−liquid and the liquid−liquid−solid equilibria were determined from calibration curves of refractive index of the solutions, and atomic absorption (AA) and X-ray diffraction analyses were made on the solids. Binodal curves were described using the Merchuk equation at T = (288.15, 293.15, 298.15, 308.15, and 318.15) K, and the fitting parameters were obtained for the corresponding temperatures. The effects of temperature on the binodal curve were also studied, and it was observed that the area of the biphasic region increased slightly with increase in temperature. Also, the tie lines were fitted to both the Othmer−Tobias and Bancroft and Setschenow-type equations. Correlation coefficients for all equations are reported.

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