2013-2017
Faculty of Science, Biochemistry Department, King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia. Title of Dissertation: “Biomarkers for evaluation of the red sea fish pollution.
2010-2013
M.Sc: Faculty of Science, Biochemistry Department, King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia. Title of Dissertation: “Characterization of α-Amylase from Miswak Salvadora persica “.
- Nanoparticles and applied in enzymology
- Production and immobiliztion of Enzymes for applied in fields medicine, environment and food industries
- Antioxidant in nature products
Sterically Controlled Interfacial Charge-Transfer Mechanisms in Unsymmetrical Squaraine Dyes for Suppressed Aggregation and Enhanced Performance in High-Efficiency Dye-Sensitized Solar Cells Abdullah N. Alotaibi, Sultan A. Al‐horaibi, Yaaser Q. Almulaiky, Ali Arabie Chemistryopen, 2026 Steric regulation at the dye/semiconductor interface critically governs charge recombination and interfacial energetics in dye‐sensitized solar cells (DSSCs) but remains poorly defined for unsymmetrical squaraine sensitizers. Here, two π‐extended unsymmetrical squaraine dyes (AQ1 and AQ2) are designed to clarify how alkyl‐chain‐induced steric modulation influences aggregation, surface packing, and intramolecular charge‐transfer (ICT) dynamics. Both dyes show strong visible–near‐infrared absorption and suitable the highest occupied molecular orbital and the lowest unoccupied molecular orbital (HOMO–LUMO) alignment for electron injection into TiO 2 . In AQ2, branched alkyl substituents provide enhanced steric shielding at the TiO 2 interface, suppressing aggregation, modifying interfacial dipoles, and increasing R rec . Importantly, efficiency gains arise mainly from steric control of interfacial energetics and recombination kinetics rather than aggregation suppression alone. Consequently, AQ2‐based DSSCs deliver 7.41% power conversion efficiency with higher R rec = 11.64 Ω and longer electron lifetime ( τ = 8.58 ms) than AQ1, despite lower dye loading. Electrochemical impedance spectroscopy (EIS) and density functional theory (DFT) corroborate suppressed back‐electron transfer.
Synergistic and Magnetically Recoverable NiFe2O4–MWCNT–CA Nanocomposites for Efficient UV-Driven Photodegradation of Organic Pollutants Assem Basurrah, Ibrahim O. Althobaiti, Yaaser Q. Almulaiky Catalysts, 2026 A synergistic and magnetically recoverable NiFe2O4–MWCNT–CA nanocomposite was developed for efficient UV-driven photodegradation of hazardous organic pollutants. Biogenic NiFe2O4 nanoparticles synthesized using Costus speciosus extract exhibited a crystallite size of 32.5 nm, which increased to 83.6 nm upon incorporation into the MWCNT–cellulose acetate matrix. XRD confirmed the preservation of the cubic spinel structure, while VSM analysis showed maintained ferrimagnetic behavior with a saturation magnetization of 9.64 emu/g, enabling rapid magnetic separation. Although BET analysis revealed a reduction in surface area from 112.46 to 30.99 m2/g due to hybridization, the conductive MWCNT network significantly enhanced charge separation and interfacial electron transport. The composite displayed a widened optical bandgap of 5.3 eV, necessitating UV excitation for photocatalytic activity. Under UV irradiation, it achieved rapid degradation of methylene blue (97%) and Congo red (91%) at 20 mg/L, with corresponding rate constants of 0.119 and 0.076 min−1. Scavenger experiments confirmed hydroxyl radicals (•OH) as the dominant reactive species, followed by photogenerated holes (h+). These results demonstrate a robust and synergistically engineered photocatalyst with high efficiency in removing organic pollutants under UV illumination.
Green Synthesis of Silver-Magnetite Co-Decorated Acrylic Fabrics Using Brachychiton populneus Extract for Antimicrobial and Antioxidant Applications Rasha A. Zailaee, Reda M. El-Shishtawy, Saleh M. Al-Maaqar, Nahed S. E. Ahmed, Yaaser Q. Almulaiky Textiles Switzerland, 2026 This manuscript reports a green approach for producing multifunctional acrylic fabrics co-decorated with Fe3O4 and Ag nanoparticles using Brachychiton populneus extract. Acrylic fabric was first amidoxime-functionalized to enable strong anchoring of Fe3O4 nanoparticles, followed by in situ deposition of AgNPs, during which the extract’s phytochemicals acted as reducing and stabilizing agents. FTIR, SEM/EDX, and VSM analyses confirmed successful surface modification and nanoparticle incorporation. The sequential treatments produced measurable add-on values (16.7% after amidoximation, followed by 10.9% and 8.5% after Fe3O4 and AgNP deposition, respectively). The Ag/Fe3O4-coated fabrics exhibited enhanced hydrophobicity and strong antimicrobial activity, with inhibition zones up to 14 mm against bacteria (including MRSA) and 26.9 mm against fungi at the highest Ag loading. Antioxidant activity was also markedly improved, showing up to a 78-fold increase in reducing power. Overall, this sustainable plant-mediated route provides an effective strategy for developing antimicrobial and antioxidant acrylic textiles for technical and protective applications.
Plant-mediated fabrication of plasmonic-magnetic Ag-Fe 3 O 4 nanocomposites for broad-spectrum photocatalytic wastewater treatment RM El-Shishtawy, AM Asiri, SA Basaif, YQ Almulaiky European Journal of Materials 6 (1), 2602831 , 2026 2026
A high-performance organic-inorganic composite for sustainable laccase immobilization based on zinc-coordinated acrylic fabric YQ Almulaiky, M Zeyadi Biomass and Bioenergy 215, 109611 , 2026 2026
Synergistic Cu-MOF/graphene oxide/polycaprolactone hybrid architecture for laccase immobilization and bioremediation of bisphenol A AN Alotaibi, R Altalhi, A Al-Dakhil, HA Alwabsi, IO Althobaiti, ... Biomass and Bioenergy 213, 109418 , 2026 2026
Novel DPPH-assisted evaluation of radical-mediated visible-light photocatalytic degradation of methylene blue using biogenic CuFe₂O₄ nanoparticles RM El-Shishtawy, AM Asiri, SA Basaif, YQ Almulaiky Inorganic Chemistry Communications, 116814 , 2026 2026
Engineering Electrically Productive J-Aggregation in cis-Squaraine Sensitizers via Dual Anchoring for High-Performance Near-IR DSSCs AN Alotaibi, SA Al-horaibi, YQ Almulaiky, J Alkabli Journal of Molecular Structure, 146450 , 2026 2026
Sterically Controlled Interfacial Charge‐Transfer Mechanisms in Unsymmetrical Squaraine Dyes for Suppressed Aggregation and Enhanced Performance in High‐Efficiency Dye … AN Alotaibi, SA Al‐horaibi, YQ Almulaiky, A Arabie ChemistryOpen 15 (5), e70199 , 2026 2026
Functionalized Cotton as a Robust Platform for Laccase Immobilization: A Sustainable Approach for Bisphenol A Bioremediation RM El-Shishtawy, N Alharbi, YQ Almulaiky Textiles 6 (2), 48 , 2026 2026
Synergistic and Magnetically Recoverable NiFe 2 O 4 –MWCNT–CA Nanocomposites for Efficient UV-Driven Photodegradation of Organic Pollutants A Basurrah, IO Althobaiti, YQ Almulaiky Catalysts 16 (3), 262 , 2026 2026
Sustainable hybrid magnetic–carbon–polymer supports for horseradish peroxidase immobilization and dye degradation H Alsufyani, J Alkabli, YQ Almulaiky Surfaces and Interfaces, 108976 , 2026 2026
Synergistic and Magnetically Recoverable NiFe2O4–MWCNT–CA Nanocomposites for Efficient UV-Driven Photodegradation of Organic Pollutants B Assem, IO Althobaiti, YQ Almulaiky Catalysts 16 (3), 262 , 2026 2026
Green Synthesis of Silver-Magnetite Co-Decorated Acrylic Fabrics Using Brachychiton populneus Extract for Antimicrobial and Antioxidant Applications RA Zailaee, RM El-Shishtawy, SM Al-Maaqar, NSE Ahmed, YQ Almulaiky Textiles 6 (1), 16 , 2026 2026 Citations: 2
Magnetically Separable and Synergistic CMC–Cu@Fe 3 O 4 Nanocomposites for Efficient, Reusable, and High-Performance Laccase Biocatalysis Y Algamal, R Altalhi, YQ Almulaiky Catalysts 16 (2), 182 , 2026 2026 Citations: 1
Eco-Friendly Fabrication of Magnetically Separable Cerium–Manganese Ferrite Nanocatalysts for Sustainable Dye Degradation Under Visible Light RM El-Shishtawy, A Basurrah, YQ Almulaiky Catalysts 16 (1), 78 , 2026 2026
Synergistic Stabilization of Horseradish Peroxidase by Green-Synthesized Silver-Decorated Magnetite Nanoparticles: Toward Sustainable Enzyme Technology LS Alqarni, YQ Almulaiky, EN Bifari, RM El-Shishtawy Catalysts 15 (12), 1098 , 2025 2025 Citations: 2
Tailored unsymmetrical squaraine dyes for high-efficiency DSSCs: Modulating aggregation and charge injection via alkyl chain engineering J Alkabli, YQ Almulaiky, K Althumayri, SA Al-horaibi Journal of Power Sources 656, 238021 , 2025 2025 Citations: 6
Biogenic Cobalt Ferrite Nanoparticles Synthesized with Brachychiton populneus Extract for Visible-Light-Driven Dye Degradation AN Alotaibi, YQ Almulaiky, A Al-Dakhil, IO Althobaiti, NSE Ahmed, ... Journal of Inorganic and Organometallic Polymers and Materials 35 (9), 7777-7793 , 2025 2025 Citations: 5
Sustainable retrievable laccase biocatalyst via functional acrylic–Nickel Ferrite hybrid support AN Alotaibi, A Al-Dakhil, HA Alwabsi, IO Althobaiti, JA Mahyoub, ... Surfaces and Interfaces, 107499 , 2025 2025 Citations: 4
Enhancing the Production of Thermostable Mangrovibacter plantisponsor Xylanase for Application in Breadmaking WA Alshehri, EM Alharbi, B Hadrich, AF Khalel, FS Alqahtani, ... Catalysts 15 (8), 792 , 2025 2025
A Novel Mesoporous Hydroxyapatite–Cobalt Oxide Composite: Synergistic Catalyst for Efficient Methylene Blue Degradation and Reusability in Wastewater Remediation Y Algamal, NM Khalil, J Alkabli, YQ Almulaiky Applied Organometallic Chemistry 39 (8), e70311 , 2025 2025 Citations: 1
Citric acid-optimized green synthesis of AgNPs: A sustainable approach for effective antimicrobial agents M Zeyadi, MM Aldhahri, HM Salwati, SM Al-Maaqar, YQ Almulaiky Biocatalysis and Biotransformation 43 (4), 384-394 , 2025 2025 Citations: 3
MOST CITED SCHOLAR PUBLICATIONS
Covalent organic frameworks as emerging host platforms for enzyme immobilization and robust biocatalysis–A review JS Gan, AR Bagheri, N Aramesh, I Gul, M Franco, YQ Almulaiky, M Bilal International journal of biological macromolecules 167, 502-515 , 2021 2021 Citations: 184
Immobilization of horseradish peroxidase on Fe3O4 magnetic nanoparticles SA Mohamed, MH Al-Harbi, YQ Almulaiky, IH Ibrahim, RM El-Shishtawy Electronic Journal of Biotechnology 27, 84-90 , 2017 2017 Citations: 176
Multi-enzyme co-immobilized nano-assemblies: Bringing enzymes together for expanding bio-catalysis scope to meet biotechnological challenges M Bilal, N Hussain, JHP Americo-Pinheiro, YQ Almulaiky, HMN Iqbal International Journal of Biological Macromolecules 186, 735-749 , 2021 2021 Citations: 103
Hydroxyapatite-decorated ZrO2 for α-amylase immobilization: Toward the enhancement of enzyme stability and reusability YQ Almulaiky, NM Khalil, RM El-Shishtawy, T Altalhi, Y Algamal, ... International Journal of Biological Macromolecules 167, 299-308 , 2021 2021 Citations: 83
GC-MS Analysis of Bioactive Compounds Extracted from Plant Rhazya stricta Using Various Solvents NA Baeshen, YQ Almulaiky, M Afifi, A Al-Farga, HA Ali, NN Baeshen, ... Plants 12 (4), 960 , 2023 2023 Citations: 82
Role of leukotriene pathway and montelukast in pulmonary and extrapulmonary manifestations of Covid-19: The enigmatic entity HM Al-Kuraishy, AI Al-Gareeb, YQ Almulaiky, N Cruz-Martins, GES Batiha European journal of pharmacology 904, 174196 , 2021 2021 Citations: 82
Amidrazone modified acrylic fabric activated with cyanuric chloride: a novel and efficient support for horseradish peroxidase immobilization and phenol removal YQ Almulaiky, RM El-Shishtawy, M Aldhahri, SA Mohamed, M Afifi, ... International Journal of Biological Macromolecules 140, 949-958 , 2019 2019 Citations: 77
Immobilization of Catalase on Chitosan/ZnO and Chitosan/ZnO/Fe 2 O 3 Nanocomposites: A Comparative Study RM El-Shishtawy, NSE Ahmed, YQ Almulaiky Catalysts 11 (7), 820 , 2021 2021 Citations: 70
Immobilisation of α-amylase on activated amidrazone acrylic fabric: a new approach for the enhancement of enzyme stability and reusability AR Al-Najada, YQ Almulaiky, M Aldhahri, RM El-Shishtawy, SA Mohamed, ... Scientific Reports 9 (1), 12672 , 2019 2019 Citations: 69
Immobilization of horseradish peroxidase on PMMA nanofibers incorporated with nanodiamond WM Alshawafi, M Aldhahri, YQ Almulaiky, N Salah, SS Moselhy, ... Artificial cells, nanomedicine, and biotechnology 46 (sup3), 973-981 , 2018 2018 Citations: 68
In vivo evaluation of hypolipidemic and antioxidative effect of ‘Ajwa’(Phoenix dactylifera L.) date seed-extract in high-fat diet-induced hyperlipidemic rat model TJ Khan, A Kuerban, SS Razvi, MG Mehanna, KA Khan, YQ Almulaiky, ... Biomedicine & Pharmacotherapy 107, 675-680 , 2018 2018 Citations: 63
Encapsulation of HRP Enzyme onto a Magnetic Fe 3 O 4 Np–PMMA Film via Casting with Sustainable Biocatalytic Activity WH Abdulaal, YQ Almulaiky, RM El-Shishtawy Catalysts 10 (2), 181 , 2020 2020 Citations: 58
Ultra-thin 2D CuO nanosheet for HRP immobilization supported by encapsulation in a polymer matrix: characterization and dye degradation M Aldhahri, YQ Almulaiky, RM El-Shishtawy, WM Al-Shawafi, N Salah, ... Catalysis Letters 151 (1), 232-246 , 2021 2021 Citations: 56
Immobilization of Trichoderma harzianum α-amylase on PPyAgNp/Fe 3 O 4 -nanocomposite: chemical and physical properties SA Mohamed, MH Al-Harbi, YQ Almulaiky, IH Ibrahim, HA Salah, ... Artificial cells, nanomedicine, and biotechnology 46 (sup2), 201-206 , 2018 2018 Citations: 54
A novel peroxidase from Arabian balsam (Commiphora gileadensis) stems: Its purification, characterization and immobilization on a carboxymethylcellulose/Fe3O4 magnetic hybrid … YQ Almulaiky, SA Al-Harbi International journal of biological macromolecules 133, 767-774 , 2019 2019 Citations: 51
Potential of anti-cancer activity of secondary metabolic products from marine fungi E Noman, MM Al-Shaibani, MA Bakhrebah, R Almoheer, M Al-Sahari, ... Journal of Fungi 7 (6), 436 , 2021 2021 Citations: 50
Improving enzyme immobilization: A new carrier-based magnetic polymer for enhanced covalent binding of laccase enzyme YQ Almulaiky, J Alkabli, RM El-Shishtawy International Journal of Biological Macromolecules 282, 137362 , 2024 2024 Citations: 43
Preparation of a calcium alginate-coated polypyrrole/silver nanocomposite for site-specific immobilization of polygalacturonase with high reusability and enhanced stability YQ Almulaiky, SA Al-Harbi Catalysis Letters 152 (1), 28-42 , 2022 2022 Citations: 43
Enhancing the sustainable immobilization of laccase by amino-functionalized PMMA-reinforced graphene nanomaterial MEM Zayed, AY Obaid, YQ Almulaiky, RM El-Shishtawy Journal of Environmental Management 351, 119503 , 2024 2024 Citations: 41
A novel peroxidase from Ziziphus jujuba fruit: purification, thermodynamics and biochemical characterization properties M Zeyadi, YQ Almulaiky Scientific reports 10 (1), 8007 , 2020 2020 Citations: 39
