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"El Hariri El Nokab, Mustapha"
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From Bioinks to Functional Tissues and Organs: Advances, Challenges, and the Promise of 3D Bioprinting
by
Ul‐Islam, Mazhar
,
Sebakhy, Khaled O.
,
Shehzad, Adeeb
in
3-D printers
,
3D bioprinting
,
Biocompatibility
2025
3D printing, particularly bioprinting, has emerged as a transformative technology in tissue engineering and regenerative medicine, enabling the precise layer‐by‐layer fabrication of living tissues and complex biomaterials. Bioprinting has evolved through advances in printing methods such as fused deposition modeling (FDM), stereolithography (SLA), powder bed fusion (PBF), and jetting techniques, each offering distinct advantages for producing high‐resolution, functional constructs. Central to bioprinting is the development of bioinks, primarily composed of natural and synthetic polymers and microbial polysaccharides, which must balance biocompatibility, mechanical integrity, and printability to support viable cell encapsulation and tissue formation. Despite remarkable progress, challenges persist, including optimizing bioink viscosity, cell viability, scaffold structural and functional complexities (vascularization, in vivo functionality), degradation rates, and scalability, as well as addressing regulatory and ethical concerns. Recent innovations, such as cryogenic printing, offer promising solutions by preserving cell viability and enhancing structural fidelity under ultra‐low temperatures. While 3D printing holds immense potential to revolutionize personalized medicine, organ fabrication, and sustainable manufacturing, current technological, biological, and economic constraints temper expectations. Continued interdisciplinary research, material innovation, and refinement of printing technologies are essential to translate 3D bioprinting from experimental platforms to clinical and commercial realities, fulfilling its promise as a cornerstone of next‐generation regenerative therapies and advanced manufacturing. This review explores recent advances in 3D bioprinting, emphasizing printing technologies, bioink design, and emerging strategies such as cryogenic printing. Key challenges in biocompatibility, vascularization, and scalability are discussed, alongside opportunities for clinical translation. Interdisciplinary innovation is identified as essential for realizing bioprinting’s transformative potential in regenerative medicine and advanced manufacturing.
Journal Article
Solid State NMR a Powerful Technique for Investigating Sustainable/Renewable Cellulose-Based Materials
by
Alshamrani, Khalid M.
,
El Hariri El Nokab, Mustapha
,
Alassmy, Yasser A.
in
Cellulose
,
Cellulose acetate
,
Drug delivery systems
2022
Solid state nuclear magnetic resonance (ssNMR) is a powerful and attractive characterization method for obtaining insights into the chemical structure and dynamics of a wide range of materials. Current interest in cellulose-based materials, as sustainable and renewable natural polymer products, requires deep investigation and analysis of the chemical structure, molecular packing, end chain motion, functional modification, and solvent–matrix interactions, which strongly dictate the final product properties and tailor their end applications. In comparison to other spectroscopic techniques, on an atomic level, ssNMR is considered more advanced, especially in the structural analysis of cellulose-based materials; however, due to a dearth in the availability of a broad range of pulse sequences, and time consuming experiments, its capabilities are underestimated. This critical review article presents the comprehensive and up-to-date work done using ssNMR, including the most advanced NMR strategies used to overcome and resolve the structural difficulties present in different types of cellulose-based materials.
Journal Article
Enhanced Catalytic Hydrogenation of Olefins in Sulfur-Rich Naphtha Using Molybdenum Carbide Supported on γ-Al2O3 Spheres under Steam Conditions: Simulating the Hot Separator Stream Process
by
Alnafisah, Mohammed S.
,
Abbas, Hadj Abbas
,
El Hariri El Nokab, Mustapha
in
Alkenes
,
Aluminum oxide
,
Bitumens
2024
Spheres comprising 10 wt.% Mo2C/γ-Al2O3, synthesized through the sucrose route, exhibited unprecedented catalytic activity for olefin hydrogenation within an industrial naphtha feedstock that contained 23 wt.% olefins, as determined by supercritical fluid chromatography (SFC). The catalyst demonstrated resilience to sulfur, exhibiting no discernible deactivation signs over a tested 96 h operational period. The resultant hydrogenated naphtha from the catalytic process contained only 2.5 wt.% olefins when the reaction was conducted at 280 °C and 3.44 × 106 Pa H2, subsequently blended with Athabasca bitumen to meet pipeline specifications for oil transportation. Additionally, the carbide catalyst spheres effectively hydrogenated olefins under steam conditions without experiencing any notable hydrogenation in the aromatics. We propose the supported carbide catalyst as a viable alternative to noble metals, serving as a selective agent for olefin elimination from light petroleum distillates in the presence of steam and sulfur, mitigating the formation of gums and deposits during the transportation of diluted bitumen (dilbit) through pipelines.
Journal Article
Synergistic Catalytic Effects of Alloys of Noble Metal Nanoparticles Supported on Two Different Supports: Crystalline Zeolite Sn-Beta and Carbon Nanotubes for Glycerol Conversion to Methyl Lactate
2023
Two multifunctional catalytic systems comprising Sn-based/doped crystalline zeolite Beta were synthesized, and they were employed as heterogeneous catalysts in the selective conversion of glycerol to methyl lactate. The first catalytic system, named Au-Pd-Sn-deAl-7.2-Beta-DP, was created through the post-synthesis dealumination of the parent zeolite Beta (Si/Al = 10) using 7.2 M HNO3. Subsequently, it was grafted with 27 mmol of SnCl4, resulting in Sn-deAl-7.2-Beta. Following this, Au and Pd nanoparticles were supported on this catalyst using the deposition–precipitation (DP) method. The second catalytic system was a physical mixture of Au and Pd nanoparticles supported on functionalized carbon nanotubes (Au-Pd-F-CNTs) and Sn-containing zeolite Beta (Sn-deAl-7.2-Beta). Both catalytic systems were employed in glycerol partial oxidation to methyl lactate under the following conditions: 140 °C for 4.5 h under an air pressure of 30 bar. The Au-Pd-Sn-deAl-7.2-Beta-DP catalytic system demonstrated 34% conversion of glycerol with a 76% selectivity for methyl lactate. In contrast, the physical mixture of Au-Pd-F-CNTs and Sn-deAl-7.2-Beta exhibited higher activity, achieving 58% glycerol conversion and a nearly identical selectivity for methyl lactate (77%). The catalytic results and catalyst structure were further analyzed using various characterization techniques, such as X-ray diffraction (XRD), N2 physisorption, scanning electron microscopy (SEM), X-ray fluorescence (XRF), transmission electron microscopy (TEM), UV-vis spectroscopy, and pyridine Fourier transform infrared (FTIR). These analyses emphasized the significance of adjusting the quantity of active sites, particle size, and active sites proximity under the chosen reaction conditions.
Journal Article
Solid State NMR Spectroscopy a Valuable Technique for Structural Insights of Advanced Thin Film Materials: A Review
2021
Solid-state NMR has proven to be a versatile technique for studying the chemical structure, 3D structure and dynamics of all sorts of chemical compounds. In nanotechnology and particularly in thin films, the study of chemical modification, molecular packing, end chain motion, distance determination and solvent-matrix interactions is essential for controlling the final product properties and applications. Despite its atomic-level research capabilities and recent technical advancements, solid-state NMR is still lacking behind other spectroscopic techniques in the field of thin films due to the underestimation of NMR capabilities, availability, great variety of nuclei and pulse sequences, lack of sensitivity for quadrupole nuclei and time-consuming experiments. This article will comprehensively and critically review the work done by solid-state NMR on different types of thin films and the most advanced NMR strategies, which are beyond conventional, and the hardware design used to overcome the technical issues in thin-film research.
Journal Article
Impact of Synthesis Parameters on the Crystallinity of Macroscopic Zeolite Y Spheres Shaped Using Resin Hard Templates
by
Alassmy, Yasser A.
,
El Hariri El Nokab, Mustapha
,
Sebakhy, Khaled O.
in
Aluminum
,
Anion exchanging
,
Composite materials
2024
In this study, the effects of several synthesis parameters including aging time, micropore-structure-directing agents, and hydrothermal treatment temperature profile were systematically examined with respect to their impact on the crystallinity of macroscopic zeolite Y spheres formed in the presence of organic anion-exchange resin templates. Spherical resins were utilized as hard templates to shape the zeolite Y particles. Zeolite Y precursors were initially deposited into the pores of the resin template and subsequently crystallized over time through precise control over these synthesis parameters. The resulting zeolite Y spheres were characterized using an array of characterization techniques, including XRD, SEM, TEM, BET, FTIR, and XRF. We identify the optimal conditions for maximizing the crystallinity of the macroscopic zeolite Y particles using resin templates as macroscopic shaping agents. This functional material has the potential to be used as both catalyst and adsorbent in several applications.
Journal Article
Solid-State NMR Spectroscopy: Towards Structural Insights into Starch-Based Materials in the Food Industry
by
Alnafisah, Mohammed S.
,
Alassmy, Yasser A.
,
Abduljawad, Marwan M.
in
Food industry
,
Glucose
,
Industrial applications
2022
Solid-state NMR is a nondestructive and noninvasive technique used to study the chemical structure and dynamics of starch-based materials and to bridge the gap between structure–function relationships and industrial applications. The study of crystallinity, chemical modification, product blending, molecular packing, amylose–amylopectin ratio, end chain motion, and solvent–matrix interactions is essential for tailoring starch product properties to various applications. This article aims to provide a comprehensive and critical review of research characterizing starch-based materials using solid-state NMR, and to briefly introduce the most advanced and promising NMR strategies and hardware designs used to overcome the sensitivity and resolution issues involved in structure–function relationships.
Journal Article
Enhanced Catalytic Hydrogenation of Olefins in Sulfur-Rich Naphtha Using Molybdenum Carbide Supported on γ-Al 2 O 3 Spheres under Steam Conditions: Simulating the Hot Separator Stream Process
Spheres comprising 10 wt.% Mo
C/γ-Al
O
, synthesized through the sucrose route, exhibited unprecedented catalytic activity for olefin hydrogenation within an industrial naphtha feedstock that contained 23 wt.% olefins, as determined by supercritical fluid chromatography (SFC). The catalyst demonstrated resilience to sulfur, exhibiting no discernible deactivation signs over a tested 96 h operational period. The resultant hydrogenated naphtha from the catalytic process contained only 2.5 wt.% olefins when the reaction was conducted at 280 °C and 3.44 × 10
Pa H
, subsequently blended with Athabasca bitumen to meet pipeline specifications for oil transportation. Additionally, the carbide catalyst spheres effectively hydrogenated olefins under steam conditions without experiencing any notable hydrogenation in the aromatics. We propose the supported carbide catalyst as a viable alternative to noble metals, serving as a selective agent for olefin elimination from light petroleum distillates in the presence of steam and sulfur, mitigating the formation of gums and deposits during the transportation of diluted bitumen (dilbit) through pipelines.
Journal Article
Enhanced Catalytic Hydrogenation of Olefins in Sulfur-Rich Naphtha Using Molybdenum Carbide Supported on γ-Alsub.2Osub.3 Spheres under Steam Conditions: Simulating the Hot Separator Stream Process
Spheres comprising 10 wt.% Mo[sub.2]C/γ-Al[sub.2]O[sub.3], synthesized through the sucrose route, exhibited unprecedented catalytic activity for olefin hydrogenation within an industrial naphtha feedstock that contained 23 wt.% olefins, as determined by supercritical fluid chromatography (SFC). The catalyst demonstrated resilience to sulfur, exhibiting no discernible deactivation signs over a tested 96 h operational period. The resultant hydrogenated naphtha from the catalytic process contained only 2.5 wt.% olefins when the reaction was conducted at 280 °C and 3.44 × 10[sup.6] Pa H[sub.2], subsequently blended with Athabasca bitumen to meet pipeline specifications for oil transportation. Additionally, the carbide catalyst spheres effectively hydrogenated olefins under steam conditions without experiencing any notable hydrogenation in the aromatics. We propose the supported carbide catalyst as a viable alternative to noble metals, serving as a selective agent for olefin elimination from light petroleum distillates in the presence of steam and sulfur, mitigating the formation of gums and deposits during the transportation of diluted bitumen (dilbit) through pipelines.
Journal Article
Solid-State NMR Analysis of Schizosaccharomyces pombe Reveals Role of α-Amylase Family Enzymes in Cell Wall Structure and Function
The fission yeast
is a widely employed model organism for studying the eukaryotic cell cycle. Like plants and bacteria,
must build a cell wall in concert with its cell cycle, but how cell wall-synthesizing and remodeling enzymes mediate this process remains unclear. Here we characterize the functions of Aah1 and Aah3, two related
α-amylases that are putative members of this evolutionarily conserved family of cell wall-modifying proteins. We found that unlike rod-shaped wildtype
cells,
cells are nearly spherical, grow slowly, have thickened cell walls, and have severe defects in cell separation following cytokinesis. Solid-state NMR spectroscopy analyses of intact wildtype and
cells revealed that
cell walls are rigidified with a significant reduction in the α-glucan matrix, characterized by reduced amounts of the major α-1,3-glucan and the minor α-1,4-glucan within the rigid and mobile phases; this reduction was compensated for by a two-fold increase in β-glucan content. Indeed, viability of
cells depended on β-glucan upregulation and the cell wall integrity pathway that mediates it. While
cells resemble cells with impaired function of the transglycosylation domain of α-glucan synthase 1 (Ags1), increased expression of Aah3 does not compensate for impaired Ags1 function or vice-versa. Overall, our data suggest that Aah1 and Aah3 are required in addition to Ags1, likely downstream, for the transglycosylation of α-glucan chains to generate fibers of appropriate dimensions to support proper cell morphology, growth, and division.
This study utilized a range of imaging techniques and high-resolution solid-state NMR spectroscopy of intact
cells to refine our understanding of
cell wall composition. This study also determined that two related GPI-anchored α-amylase family proteins, Aah1 and Aah3, likely act as transglycosylases non-redundantly with an α-glucan synthase in the synthesis of α-glucan chains of appropriate content and size to support polarized growth and cell division. Our results also highlight the anti-fungal therapeutic potential of GPI-anchored enzymes acting in concert with glucan synthases.
Journal Article