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  1. Article ; Online: Cost-effective removal of toxic methylene blue dye from textile effluents by new integrated crosslinked chitosan/aspartic acid hydrogels.

    Mustafa, Fatma H A / Gad ElRab, Ebtsam Kh M / Kamel, Rasha M / Elshaarawy, Reda F M

    International journal of biological macromolecules

    2023  Volume 248, Page(s) 125986

    Abstract: Chitosan/aspartic acid hydrogels were synthesized for MB dye removal from textile aqueous effluents with different ratios by gelation of chitosan with non-toxic gelling agent, crosslinker, glutaraldehyde (Glu). The obtained hydrogels were characterized ... ...

    Abstract Chitosan/aspartic acid hydrogels were synthesized for MB dye removal from textile aqueous effluents with different ratios by gelation of chitosan with non-toxic gelling agent, crosslinker, glutaraldehyde (Glu). The obtained hydrogels were characterized by spectral and morphological techniques. The characterization techniques confirmed successful preparations and MB dye adsorption. Batch experiments were done to investigate the effects of adsorbent dose, pH, contact time, temperature, and initial MB dye concentration. The optimum conditions were: adsorbent dose 0.1 g, pH 5, contact time 30 min, and temperature 25 °C for Chitosan-Aspartic Acid Hydrogel 1 (CSAA-HG
    MeSH term(s) Methylene Blue/chemistry ; Chitosan/chemistry ; Aspartic Acid ; Hydrogels/chemistry ; Cost-Benefit Analysis ; Water Pollutants, Chemical/chemistry ; Hydrogen-Ion Concentration ; Adsorption ; Kinetics ; Coloring Agents/chemistry ; Thermodynamics
    Chemical Substances Methylene Blue (T42P99266K) ; Chitosan (9012-76-4) ; Aspartic Acid (30KYC7MIAI) ; Hydrogels ; Water Pollutants, Chemical ; Coloring Agents
    Language English
    Publishing date 2023-07-26
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 282732-3
    ISSN 1879-0003 ; 0141-8130
    ISSN (online) 1879-0003
    ISSN 0141-8130
    DOI 10.1016/j.ijbiomac.2023.125986
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Synthesis of new quaternized chitosan Schiff bases and their N-alkyl derivatives as antimicrobial and anti-biofilm retardants in membrane technology.

    Youssef Moustafa, Amal M / Fawzy, Mona M / Kelany, Mahmoud S / Hassan, Yasser A / Elsharaawy, Reda F M / Mustafa, Fatma H A

    International journal of biological macromolecules

    2024  Volume 267, Issue Pt 2, Page(s) 131635

    Abstract: New quaternized salicylidene chitosan Schiff bases (QSCSBs) and their N-octyl derivatives (OQCs) have been synthesized and characterized, aiming to develop innovative antimicrobial and anti-biofilm agents. This research holds immense potential, as these ... ...

    Abstract New quaternized salicylidene chitosan Schiff bases (QSCSBs) and their N-octyl derivatives (OQCs) have been synthesized and characterized, aiming to develop innovative antimicrobial and anti-biofilm agents. This research holds immense potential, as these compounds could be utilized as anti-biofouling additives in membrane technology in the future. The synthesis involved the modification of low molecular-weight-chitosan (LMC) through simultaneous Schiff base formation and quaternization processes to create QSCSBs. Subsequently, QSCSBs were catalytically reduced to form quaternized N-benzyl chitosan (QBCs) intermediates, which then underwent nucleophilic substitution reactions affording N-octyl quaternized chitosans (OQCs). Characterization techniques such as elemental, spectral, and microscopic analyses were used to confirm the successful synthesis of these materials. As membrane technology relies on surface charge, QSCSBs and OQCs with large zeta potentials could be used as positively charged additives. Moreover, SEM image revealed the regular distribution of pores and voids across the additives' surfaces raises intriguing questions about their implications for membrane performance. Meanwhile, the superior antibacterial and antibiofilm potential of these materials, particularly QSCSB2 and OQC2, indicate that the utilization of these compounds as anti-biofouling additives in membrane technology could significantly improve the performance and longevity of membranes used in various applications such as water treatment and desalination.
    MeSH term(s) Chitosan/chemistry ; Chitosan/pharmacology ; Chitosan/analogs & derivatives ; Chitosan/chemical synthesis ; Schiff Bases/chemistry ; Schiff Bases/pharmacology ; Schiff Bases/chemical synthesis ; Biofilms/drug effects ; Membranes, Artificial ; Anti-Infective Agents/pharmacology ; Anti-Infective Agents/chemistry ; Anti-Infective Agents/chemical synthesis ; Anti-Bacterial Agents/pharmacology ; Anti-Bacterial Agents/chemical synthesis ; Anti-Bacterial Agents/chemistry ; Microbial Sensitivity Tests
    Chemical Substances Chitosan (9012-76-4) ; Schiff Bases ; Membranes, Artificial ; Anti-Infective Agents ; Anti-Bacterial Agents
    Language English
    Publishing date 2024-04-17
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 282732-3
    ISSN 1879-0003 ; 0141-8130
    ISSN (online) 1879-0003
    ISSN 0141-8130
    DOI 10.1016/j.ijbiomac.2024.131635
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Cost-effective removal of toxic methylene blue dye from textile effluents by new integrated crosslinked chitosan/aspartic acid hydrogels

    Mustafa, Fatma H.A. / Gad ElRab, Ebtsam Kh.M. / Kamel, Rasha M. / Elshaarawy, Reda F.M.

    International Journal of Biological Macromolecules. 2023 Sept., v. 248 p.125986-

    2023  

    Abstract: Chitosan/aspartic acid hydrogels were synthesized for MB dye removal from textile aqueous effluents with different ratios by gelation of chitosan with non-toxic gelling agent, crosslinker, glutaraldehyde (Glu). The obtained hydrogels were characterized ... ...

    Abstract Chitosan/aspartic acid hydrogels were synthesized for MB dye removal from textile aqueous effluents with different ratios by gelation of chitosan with non-toxic gelling agent, crosslinker, glutaraldehyde (Glu). The obtained hydrogels were characterized by spectral and morphological techniques. The characterization techniques confirmed successful preparations and MB dye adsorption. Batch experiments were done to investigate the effects of adsorbent dose, pH, contact time, temperature, and initial MB dye concentration. The optimum conditions were: adsorbent dose 0.1 g, pH 5, contact time 30 min, and temperature 25 °C for Chitosan-Aspartic Acid Hydrogel 1 (CSAA-HG₁) and adsorbent dose 0.4 g, pH 2, contact time 60 min, temperature 25 °C for Chitosan-Aspartic Acid Hydrogel 2 (CSAA-HG₂). Adsorption capacity of newly hydrogels CSAA-HG₁,₂ was compared with each other. Adsorption efficiencies reached 99.85 % for CSAA-HG₁ and 99.88 % for CSAA-HG₂. MB dye adsorption on CSAA-HG₁,₂ followed Freundlich isotherm model (R² = 0.94 and 0.92, respectively). Both adsorbents exhibited pseudo-second-order kinetics for MB dye adsorption (R² = 1). The negative ΔHᵒ indicated that the MB dye adsorption was exothermic, negative ΔGᵒ confirmed that MB dye adsorption process was spontaneous and low values of ∆Sᵒ indicated low degree of freedom, ordered MB dye molecules on CSAA-HG₁,₂ surfaces.
    Keywords adsorbents ; adsorption ; aspartic acid ; chitosan ; cost effectiveness ; crosslinking ; fabrics ; gelation ; glutaraldehyde ; heat production ; hydrogels ; methylene blue ; models ; pH ; sorption isotherms ; temperature ; toxicity ; Crab chitosan hydrogel ; Waste water treatment ; Adsorption isotherm ; Kinetics ; Thermodynamics
    Language English
    Dates of publication 2023-09
    Publishing place Elsevier B.V.
    Document type Article ; Online
    ZDB-ID 282732-3
    ISSN 1879-0003 ; 0141-8130
    ISSN (online) 1879-0003
    ISSN 0141-8130
    DOI 10.1016/j.ijbiomac.2023.125986
    Database NAL-Catalogue (AGRICOLA)

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  4. Article ; Online: Dual ionic liquid-based crosslinked chitosan for fine-tuning of antifouling, water throughput, and denitrification performance of polysulfone membrane.

    Elshaarawy, Reda F M / Abd El-Aal, Reda M / Mustafa, Fatma H A / Borai, Ahmed E / Schmidt, Stephan / Janiak, Christoph

    International journal of biological macromolecules

    2020  Volume 170, Page(s) 572–582

    Abstract: This study aimed to design a facile and efficient protocol for upgrading the performance indices of polysulfone (PS) membrane (porosity, hydrophilicity, pure water flux (PWF), surface charge, and fouling-resistance) by blending with newly synthesized ... ...

    Abstract This study aimed to design a facile and efficient protocol for upgrading the performance indices of polysulfone (PS) membrane (porosity, hydrophilicity, pure water flux (PWF), surface charge, and fouling-resistance) by blending with newly synthesized poly(ionic) crosslinked chitosan Schiff bases (PICCSBs). The PS-PICCSBs mixed-matrix membranes (MMMs) have successfully fabricated and characterized based on spectral and microscopic analyses, porosity, zeta potential, water contact angle, and water uptake (wettability) measurements. The PWF, fouling-resistance against bovine serum albumin (BSA), as well as ion exchange capacity (IEC) against nitrate anion were studied. The wettability, hydrophilicity and overall porosity of new MMMs have greatly increased, in comparison to a pristine PS membrane (M
    MeSH term(s) Chitosan/chemistry ; Denitrification ; Hydrophobic and Hydrophilic Interactions ; Ionic Liquids/chemistry ; Membranes/chemistry ; Membranes, Artificial ; Polymers/chemistry ; Porosity ; Serum Albumin, Bovine/chemistry ; Sulfones/chemistry ; Ultrafiltration ; Water/chemistry
    Chemical Substances Ionic Liquids ; Membranes, Artificial ; Polymers ; Sulfones ; Water (059QF0KO0R) ; polysulfone P 1700 (25135-51-7) ; Serum Albumin, Bovine (27432CM55Q) ; Chitosan (9012-76-4)
    Language English
    Publishing date 2020-12-29
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 282732-3
    ISSN 1879-0003 ; 0141-8130
    ISSN (online) 1879-0003
    ISSN 0141-8130
    DOI 10.1016/j.ijbiomac.2020.12.186
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

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  5. Article: Surface functionalization of chitosan isolated from shrimp shells, using salicylaldehyde ionic liquids in exploration for novel economic and ecofriendly antibiofoulants

    Elshaarawy, Reda F. M / Mustafa, Fatma H. A / Herbst, Annika / Farag, Aida E. M / Janiak, Christoph

    RSC advances. 2016 Feb. 19, v. 6, no. 25

    2016  

    Abstract: Since the use of organotin as antifouling additives was prohibited in 2003, many researchers have endeavored to design and develop novel economic environment-friendly marine antifouling additives. This work reports the successful functionalization of ... ...

    Abstract Since the use of organotin as antifouling additives was prohibited in 2003, many researchers have endeavored to design and develop novel economic environment-friendly marine antifouling additives. This work reports the successful functionalization of biopolymeric chitosan, isolated from shrimp shells, with salicylidene ionic liquid (IL-Sal) brushes, (ILCSB1–6). These designed architectures were structurally and morphologically characterized. Marine biofouling-inducing bacterial strains (S. aureus, E. coli, A. hydrophila and Vibrio) were selected as microfoulants for a laboratory antibacterial and biofilm susceptibility assay investigation. Our outcomes unveiled a novel promising ecofriendly biocidal agent with excellent and broad antibacterial efficacy compared to parent chitosan and the standard antifoulant, Diuron®. The fabricated poly-IL-brushes chitosan architectures were subjected to a rigorous test in a field trial in Red Sea water. Our findings provide new insights into eco-friendly antifouling additives as an alternative to traditional antifouling agents. Novel IL-functionalized chitosan-based coatings exhibited long-term durability, surface inertness and promising antifouling performance.
    Keywords Escherichia coli ; Staphylococcus aureus ; Vibrio ; additives ; antibacterial properties ; antifouling agents ; biofilm ; chitosan ; coatings ; durability ; field experimentation ; hydroxybenzaldehyde ; ionic liquids ; seawater ; shrimp shells ; Red Sea
    Language English
    Dates of publication 2016-0219
    Size p. 20901-20915.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ISSN 2046-2069
    DOI 10.1039/c5ra27489c
    Database NAL-Catalogue (AGRICOLA)

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  6. Article ; Online: Mining marine shell wastes for polyelectrolyte chitosan anti-biofoulants: Fabrication of high-performance economic and ecofriendly anti-biofouling coatings.

    Elshaarawy, Reda F M / Mustafa, Fatma H A / van Geelen, Lasse / Abou-Taleb, Amaal E A / Tadros, Hermine R Z / Kalscheuer, Rainer / Janiak, Christoph

    Carbohydrate polymers

    2017  Volume 172, Page(s) 352–364

    Abstract: Banning organotins as antifouling biocides in 2003 was the starting point for many researchers to search for novel economic and environmentally-friendly anti-fouling biocides. In our present contribution, we have successfully functionalized a natural ... ...

    Abstract Banning organotins as antifouling biocides in 2003 was the starting point for many researchers to search for novel economic and environmentally-friendly anti-fouling biocides. In our present contribution, we have successfully functionalized a natural biopolymer, chitosan (CS), isolated from marine wastes with polyelectrolyte brushes akin to ionic liquids. These antifouling biopolymers anchoring polyelectrolyte brushes were in vitro assessed for their ability to eradicate or inhibit the Staphylococcal/Escherichia biofilms. Moreover, these anti-fouling candidates were incorporated into the matrix of commercial paint to formulate antifouling coatings which were subjected to a field static immersion test in the Mediterranean Sea in comparison to a standard antifoulant, Diuron
    MeSH term(s) Animal Shells/chemistry ; Animals ; Biofilms/drug effects ; Biofouling/prevention & control ; Chitosan/chemistry ; Mediterranean Sea ; Paint ; Polyelectrolytes/chemistry
    Chemical Substances Polyelectrolytes ; Chitosan (9012-76-4)
    Language English
    Publishing date 2017-05-24
    Publishing country England
    Document type Journal Article
    ZDB-ID 1501516-6
    ISSN 1879-1344 ; 0144-8617
    ISSN (online) 1879-1344
    ISSN 0144-8617
    DOI 10.1016/j.carbpol.2017.05.059
    Database MEDical Literature Analysis and Retrieval System OnLINE

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