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  1. Article ; Online: Incorporation of silver stearate nanoparticles in methacrylate polymeric monoliths for hemeprotein isolation

    Alzahrani Eman

    Open Chemistry, Vol 18, Iss 1, Pp 399-

    2020  Volume 411

    Abstract: A unique method was used to synthesize extremely stable silver stearate nanoparticles (AgStNPs) incorporated in an organic-based monolith. The facile strategy was then used to selectively isolate hemeproteins, myoglobin (Myo) and hemoglobin (Hb). Ethyl ... ...

    Abstract A unique method was used to synthesize extremely stable silver stearate nanoparticles (AgStNPs) incorporated in an organic-based monolith. The facile strategy was then used to selectively isolate hemeproteins, myoglobin (Myo) and hemoglobin (Hb). Ethyl alcohol, silver nitrate, and stearic acid were, respectively, utilized as reducing agents, silver precursors, and capping agents. The color changed to cloudy from transparent, indicating that AgStNPs had been formed. AgStNP nanostructures were then distinctly integrated into the natural polymeric scaffold. To characterize the AgStNP–methacrylate polymeric monolith and the silver nanoparticles, energy-dispersive X-ray (EDX), scanning electron microscopy (SEM), and Fourier-transform infrared (FT-IR) spectroscopy were used. The results of the SEM analysis indicated that the AgStNP–methacrylate polymeric monolith’s texture was so rough in comparison with that of the methacrylate polymeric monolith, indicating that the extraction process of the monolith materials would be more efficient because of the extended surface area of the absorbent. The comparison between the FT-IR spectra of AgStNPs, the bare organic monolith, and AgStNP–methacrylate polymeric monolith confirms that the AgStNPs were immobilized on the surface of the organic monolith. The EDX profile of the built materials indicated an advanced peak of the Ag sequence which represented an Ag atom of 3.27%. The results therefore established that the AgStNPs had been successfully integrated into the monolithic materials. Extraction efficiencies of 92% and 97% were used to, respectively, recover preconcentrated Myo and Hb. An uncomplicated method is a unique approach of both fabrication and utilization of the nanosorbent to selectively isolate hemeproteins. The process can further be implemented by using other noble metals.
    Keywords silver stearate nanoparticles ; integration ; monolithic hybrid solid ; hemeproteins ; hydrophobicity ; Chemistry ; QD1-999
    Subject code 620
    Language English
    Publishing date 2020-04-01T00:00:00Z
    Publisher De Gruyter
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article: Polycarbonate Microchip Containing CuBTC-Monopol Monolith for Solid-Phase Extraction of Dyes.

    Alzahrani, Eman

    International journal of analytical chemistry

    2020  Volume 2020, Page(s) 8548927

    Abstract: In the present study, preparation of CuBTC-monopol monoliths for use within the microchip solid phase extraction was undertaken through a 20-min UV lamp-assisted polymerization for 2,2-dimethoxy-2-phenyl acetophenone (DMPA), butyl methacrylate (BMA), and ...

    Abstract In the present study, preparation of CuBTC-monopol monoliths for use within the microchip solid phase extraction was undertaken through a 20-min UV lamp-assisted polymerization for 2,2-dimethoxy-2-phenyl acetophenone (DMPA), butyl methacrylate (BMA), and ethylene dimethacrylate (EDMA) alongside inclusion of the porogenic solvent system (1-propanol and methanol (1 : 1)). The resultant coating underwent coating using CuBTC nanocrystals in ethanolic solution of ethanolic solution of 1,3,5-benzenetricarboxylic acid (H
    Language English
    Publishing date 2020-02-11
    Publishing country Egypt
    Document type Journal Article
    ZDB-ID 2494714-3
    ISSN 1687-8779 ; 1687-8760
    ISSN (online) 1687-8779
    ISSN 1687-8760
    DOI 10.1155/2020/8548927
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Colorimetric Detection Based on Localized Surface Plasmon Resonance Optical Characteristics for Sensing of Mercury Using Green-Synthesized Silver Nanoparticles.

    Alzahrani, Eman

    Journal of analytical methods in chemistry

    2020  Volume 2020, Page(s) 6026312

    Abstract: Development of selective colorimetric detectors that can use green-fabricated silver nanoparticles' (AgNPs) with localized surface plasmon resonances (LSPRs) to rapidly, simply, and selectively detect Hg(II) ions was undertaken in this study. Onion ... ...

    Abstract Development of selective colorimetric detectors that can use green-fabricated silver nanoparticles' (AgNPs) with localized surface plasmon resonances (LSPRs) to rapidly, simply, and selectively detect Hg(II) ions was undertaken in this study. Onion extract was used for synthesising photo-induced green crystalline silver nanoparticles (NPs). The formation of nanoparticles is enhanced when ultrasound irradiation is present; bioligands could serve as stabilizing and reducing agents. Different methods of measurement, including UV-Vis, TEM, SEM/EDAX, FT - IR, and XRD, are effective for characterization of nanoparticles. The spherical nature of green-fabricated AgNPs is confirmed by TEM. High-density, spherical, and uniformly formed silver nanoparticle shapes were found in silver nanoparticle SEM images. The arrangement of AgNPs in the form of face-centered cubic structures was confirmed by XRD patterns. The formation of impurity-free AgNPs was confirmed using the EDAX analysis results. Hg
    Language English
    Publishing date 2020-01-11
    Publishing country Egypt
    Document type Journal Article
    ZDB-ID 2654178-6
    ISSN 2090-8873 ; 2090-8865
    ISSN (online) 2090-8873
    ISSN 2090-8865
    DOI 10.1155/2020/6026312
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Chitosan Membrane Embedded With ZnO/CuO Nanocomposites for the Photodegradation of Fast Green Dye Under Artificial and Solar Irradiation.

    Alzahrani, Eman

    Analytical chemistry insights

    2018  Volume 13, Page(s) 1177390118763361

    Abstract: Fast Green (FCF) dye is commonly used in both cytology and histology applications. Previous studies have found that it can cause mutagenic and tumorigenic effects in experimental human and animal populations. It can also be a source of skin, eye, ... ...

    Abstract Fast Green (FCF) dye is commonly used in both cytology and histology applications. Previous studies have found that it can cause mutagenic and tumorigenic effects in experimental human and animal populations. It can also be a source of skin, eye, respiratory, and digestive irritation. The purpose of this study was to examine the use of thin film membranes to degrade FCF. A thin film membrane of chitosan (CS) was fabricated and subsequently filled with zinc oxide nanoparticles (ZnO) or ZnO/CuO-heterostructured nanocomposites. The CS membrane was used as a matrix, and the nanomaterials were used as photocatalysts. The prepared membranes were characterised by four analytical techniques: atomic force microscopy, scanning electron microscopy, X-ray diffraction, and energy-dispersive X-ray analyses. The photocatalytic activity of the fabricated membranes was evaluated by performing experiments in which aqueous solutions of FCF dye that contained the fabricated membrane were irradiated with solar light or UV light. The photodegradation percentage was spectrophotometrically determined by monitoring the maximum wavelengths (λ
    Language English
    Publishing date 2018-03-21
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2423805-3
    ISSN 1177-3901
    ISSN 1177-3901
    DOI 10.1177/1177390118763361
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Colorimetric Detection Based on Localized Surface Plasmon Resonance Optical Characteristics for Sensing of Mercury Using Green-Synthesized Silver Nanoparticles

    Alzahrani, Eman

    Journal of Analytical Methods in Chemistry (Online). 2020 Jan. 11, v. 2020

    2020  

    Abstract: Development of selective colorimetric detectors that can use green-fabricated silver nanoparticles’ (AgNPs) with localized surface plasmon resonances (LSPRs) to rapidly, simply, and selectively detect HgII ions was undertaken in this study. Onion extract ...

    Abstract Development of selective colorimetric detectors that can use green-fabricated silver nanoparticles’ (AgNPs) with localized surface plasmon resonances (LSPRs) to rapidly, simply, and selectively detect HgII ions was undertaken in this study. Onion extract was used for synthesising photo-induced green crystalline silver nanoparticles (NPs). The formation of nanoparticles is enhanced when ultrasound irradiation is present; bioligands could serve as stabilizing and reducing agents. Different methods of measurement, including UV-Vis, TEM,SEM/EDAX, FT−IR, and XRD, are effective for characterization of nanoparticles. The spherical nature of green-fabricated AgNPs is confirmed by TEM. High-density, spherical, and uniformly formed silver nanoparticle shapes were found in silver nanoparticle SEM images. The arrangement of AgNPs in the form of face-centered cubic structures was confirmed by XRD patterns. The formation of impurity-free AgNPs was confirmed using the EDAX analysis results. Hg2+ with excellent sensitivity was sensitively and selectively detected by employing green-synthesized silver nanoparticles. The reduction of Ag (1) to Ag (0) was confirmed by a slight increase in Hg (II) concentration and progressive reduction of green-synthesized AgNPs, whose absorbance changed abruptly. The reduction of LSPRs by the phosphate buffer medium enables AgNPs to sensitively and selectively detect Hg2+ ions by providing good environment. Besides, a selective, sensitive, simple, and rapid method that is proposed for detecting Hg (II) ions in samples of water is presented in the study. Harmful mercury ions in real samples of water (tap and ground water) can colorimetrically and selectively be detected using the AgNPs. The results showed an RSD of below 6% and over 92% of good recovery.
    Keywords X-ray diffraction ; absorbance ; colorimetry ; detectors ; energy-dispersive X-ray analysis ; groundwater ; ions ; mercury ; nanoparticles ; nanosilver ; onions ; phosphates ; rapid methods ; reducing agents ; scanning electron microscopy ; silver ; surface plasmon resonance ; transmission electron microscopy ; ultrasonic treatment ; ultraviolet-visible spectroscopy
    Language English
    Dates of publication 2020-0111
    Publishing place Hindawi
    Document type Article
    ZDB-ID 2654178-6
    ISSN 2090-8873 ; 2090-8865
    ISSN (online) 2090-8873
    ISSN 2090-8865
    DOI 10.1155/2020/6026312
    Database NAL-Catalogue (AGRICOLA)

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  6. Article: Colorimetric Detection Based on Localised Surface Plasmon Resonance Optical Characteristics for the Detection of Hydrogen Peroxide Using Acacia Gum-Stabilised Silver Nanoparticles.

    Alzahrani, Eman

    Analytical chemistry insights

    2017  Volume 12, Page(s) 1177390116684686

    Abstract: The use of nanoparticles in sensing is attracting the interest of many researchers. The aim of this work was to fabricate Acacia gum-stabilised silver nanoparticles (SNPs) using green chemistry to use them as a highly sensitive and cost-effective ... ...

    Abstract The use of nanoparticles in sensing is attracting the interest of many researchers. The aim of this work was to fabricate Acacia gum-stabilised silver nanoparticles (SNPs) using green chemistry to use them as a highly sensitive and cost-effective localised surface plasmon resonance (LSPR) colorimeter sensor for the determination of reactive oxygen species, such as hydrogen peroxide (H
    Language English
    Publishing date 2017-02-23
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2423805-3
    ISSN 1177-3901
    ISSN 1177-3901
    DOI 10.1177/1177390116684686
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: QMMAC: Quorum-Based Multichannel MAC Protocol for Wireless Sensor Networks.

    Alzahrani, Eman / Bouabdallah, Fatma

    Sensors (Basel, Switzerland)

    2021  Volume 21, Issue 11

    Abstract: In wireless sensor networks, energy conservation is a critical task. Thus, it is crucial to design an effective MAC protocol that minimizes energy consumption while guaranteeing high network throughput and low delay. In this article, we propose a quorum- ... ...

    Abstract In wireless sensor networks, energy conservation is a critical task. Thus, it is crucial to design an effective MAC protocol that minimizes energy consumption while guaranteeing high network throughput and low delay. In this article, we propose a quorum-based multichannel MAC protocol (QMMAC) for corona-based WSNs. QMMAC utilizes the multichannel communication feature and the quorum concept to greatly increase the throughput while conserving energy. The aim of this protocol is to allow each node and all its forwarders to wake up at the same time while avoiding collision and overhearing by separating their simultaneous communications using the multichannel feature. More precisely, the main idea of QMMAC is twofold. First, QMMAC wakeup scheduling is designed to minimize the end-to-end delay by allowing nodes to wake up at exactly the same time as their potential forwarders, whereas nodes that are not acting as forwarders for each other wake up at a completely different time, and thus overhearing, idle listening and collisions are avoided. Second, channel assignment, which also uses the concept of quorums, is used to share data channels so that there is no conflict or additional packet exchange required to negotiate the availability of channels. Thus, the end-to-end delay is further minimized as well as collisions between conflicting neighbors are avoided. Simulation results indicate that the network performance is improved by QMMAC in terms of energy efficiency, throughput and end-to-end delay.
    Language English
    Publishing date 2021-05-30
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s21113789
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: Synthesis, Optimization, and Characterization of Ecofriendly Production of Gold Nanoparticles Using Lemon Peel Extract.

    Alzahrani, Eman / Alkhudidy, Ashwaq T

    International journal of analytical chemistry

    2021  Volume 2021, Page(s) 7192868

    Abstract: This study examines the importance of utilizing green synthesis using lemon peel for gold nanoparticles over other chemicals since it is environmentally friendly, available, and cheap. Several parameters were optimized to ensure the extraction of the ... ...

    Abstract This study examines the importance of utilizing green synthesis using lemon peel for gold nanoparticles over other chemicals since it is environmentally friendly, available, and cheap. Several parameters were optimized to ensure the extraction of the GNPs concentration of lemon peels using HAuCl
    Language English
    Publishing date 2021-12-13
    Publishing country Egypt
    Document type Journal Article
    ZDB-ID 2494714-3
    ISSN 1687-8779 ; 1687-8760
    ISSN (online) 1687-8779
    ISSN 1687-8760
    DOI 10.1155/2021/7192868
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Eco-friendly production of metal nanoparticles immobilised on organic monolith for pepsin extraction

    Alzahrani Eman / Alkhudaidy Ashwaq T.

    Polish Journal of Chemical Technology, Vol 22, Iss 1, Pp 18-

    2020  Volume 28

    Abstract: Polymer monoliths modified by using nanoparticles (NPs) integrate high NP specific surface area with different monolith surface chemistry and high porosity. As a result, they have extensive applications within different fields, whereas nanomaterial- ... ...

    Abstract Polymer monoliths modified by using nanoparticles (NPs) integrate high NP specific surface area with different monolith surface chemistry and high porosity. As a result, they have extensive applications within different fields, whereas nanomaterial-functionalised porous polymer monoliths have elicited considerable interest from investigators. This study is aimed at fabricating organic polymer-based monoliths from polybutyl methacrylate-co-ethylenedimethacrylate (BuMA-co-EDMA) monoliths prior to immobilization of gold or silver metal on the pore surface of the monoliths using reducing reagent (extracts of lemon peels). This was intended to denote a sustainable technique of immobilizing nanoparticles that are advantageous over physical and chemical techniques because it is safe in terms of handling, readily available, environmentally friendly, and cheap. Two different methods were used in the study to effectively immobilize nanoparticles on monolithic components. The outcomes showed that soaking the monolith rod in the prepared nano solution directly and placing it within ovens at temperatures of 80°C constituted the most effective method. Characterisation of the fabricated monolith was undertaken using SEM/EDX analysis, UV-vis. spectra analysis, and visual observation. The SEM analysis showed that nanoparticles were extensively immobilised on the surface polymers. Another peak was attained through EDX analysis, thus confirming the Au atom existence at 2.83% alongside another peak that proved the Ag atom existence at 1.92%. The fabricated components were used as sorbents for purifying protein. The ideal performance was achieved using gold nanoparticles (GNPs) immobilised organic monolith that attained a greater pepsin extraction recovery compared to silver nanoparticles (SNPs) immobilised organic monoliths alongside bare organic-based monolith.
    Keywords polymer monolith ; immobilization ; metal nanoparticles ; pepsin purification ; Chemistry ; QD1-999
    Subject code 540 ; 620
    Language English
    Publishing date 2020-03-01T00:00:00Z
    Publisher Sciendo
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Article: Photodegradation of Eosin Y Using Silver-Doped Magnetic Nanoparticles.

    Alzahrani, Eman

    International journal of analytical chemistry

    2015  Volume 2015, Page(s) 797606

    Abstract: The purification of industrial wastewater from dyes is becoming increasingly important since they are toxic or carcinogenic to human beings. Nanomaterials have been receiving significant attention due to their unique physical and chemical properties ... ...

    Abstract The purification of industrial wastewater from dyes is becoming increasingly important since they are toxic or carcinogenic to human beings. Nanomaterials have been receiving significant attention due to their unique physical and chemical properties compared with their larger-size counterparts. The aim of the present investigation was to fabricate magnetic nanoparticles (MNPs) using a coprecipitation method, followed by coating with silver (Ag) in order to enhance the photocatalytic activity of the MNPs by loading metal onto them. The fabricated magnetic nanoparticles coated with Ag were characterised using different instruments such as a scanning electron microscope (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray (EDAX) spectroscopy, and X-ray diffraction (XRD) analysis. The average size of the magnetic nanoparticles had a mean diameter of about 48 nm, and the average particle size changed to 55 nm after doping. The fabricated Ag-doped magnetic nanoparticles were used for the degradation of eosin Y under UV-lamp irradiation. The experimental results revealed that the use of fabricated magnetic nanoparticles coated with Ag can be considered as reliable methods for the removal of eosin Y since the slope of evaluation of pseudo-first-order rate constant from the slope of the plot between ln⁡(C o /C) and the irradiation time was found to be linear. Ag-Fe3O4 nanoparticles would be considered an efficient photocatalyst to degrade textile dyes avoiding the tedious filtration step.
    Language English
    Publishing date 2015-11-04
    Publishing country Egypt
    Document type Journal Article
    ZDB-ID 2494714-3
    ISSN 1687-8779 ; 1687-8760
    ISSN (online) 1687-8779
    ISSN 1687-8760
    DOI 10.1155/2015/797606
    Database MEDical Literature Analysis and Retrieval System OnLINE

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