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Article: Plant Fibers as Composite Reinforcements for Biomedical Applications.

Zamora-Mendoza, Lizbeth / Gushque, Fernando / Yanez, Sabrina / Jara, Nicole / Álvarez-Barreto, José F / Zamora-Ledezma, Camilo / Dahoumane, Si Amar / Alexis, Frank

Bioengineering (Basel, Switzerland)

2023 Volume 10, Issue 7

Abstract: Plant fibers possess high strength, high fracture toughness and elasticity, and have proven useful because of their diversity, versatility, renewability, and sustainability. For biomedical applications, these natural fibers have been used as ... ...

Abstract	Plant fibers possess high strength, high fracture toughness and elasticity, and have proven useful because of their diversity, versatility, renewability, and sustainability. For biomedical applications, these natural fibers have been used as reinforcement for biocomposites to infer these hybrid biomaterials mechanical characteristics, such as stiffness, strength, and durability. The reinforced hybrid composites have been tested in structural and semi-structural biodevices for potential applications in orthopedics, prosthesis, tissue engineering, and wound dressings. This review introduces plant fibers, their properties and factors impacting them, in addition to their applications. Then, it discusses different methodologies used to prepare hybrid composites based on these widespread, renewable fibers and the unique properties that the obtained biomaterials possess. It also examines several examples of hybrid composites and their biomedical applications. Finally, the findings are summed up and some thoughts for future developments are provided. Overall, the focus of the present review lies in analyzing the design, requirements, and performance, and future developments of hybrid composites based on plant fibers.
Language	English
Publishing date	2023-07-05
Publishing country	Switzerland
Document type	Journal Article ; Review
ZDB-ID	2746191-9
ISSN	2306-5354
ISSN	2306-5354
DOI	10.3390/bioengineering10070804
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Article ; Online: Nanofluid Formulations Based on Two-Dimensional Nanoparticles, Their Performance, and Potential Application as Water-Based Drilling Fluids.

Zamora-Ledezma, Camilo / Narváez-Muñoz, Christian / Guerrero, Víctor H / Medina, Ernesto / Meseguer-Olmo, Luis

ACS omega

2022 Volume 7, Issue 24, Page(s) 20457–20476

Abstract: The development of sustainable, cost-efficient, and high-performance nanofluids is one of the current research topics within drilling applications. The inclusion of tailorable nanoparticles offers the possibility of formulating water-based fluids with ... ...

Abstract	The development of sustainable, cost-efficient, and high-performance nanofluids is one of the current research topics within drilling applications. The inclusion of tailorable nanoparticles offers the possibility of formulating water-based fluids with enhanced properties, providing unprecedented opportunities in the energy, oil, gas, water, or infrastructure industries. In this work, the most recent and relevant findings related with the development of customizable nanofluids are discussed, focusing on those based on the incorporation of 2D (two-dimensional) nanoparticles and environmentally friendly precursors. The advantages and drawbacks of using 2D layered nanomaterials including but not limited to silicon nano-glass flakes, graphene, MoS
Language	English
Publishing date	2022-06-08
Publishing country	United States
Document type	Journal Article ; Review
ISSN	2470-1343
ISSN (online)	2470-1343
DOI	10.1021/acsomega.2c02082
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Article ; Online: Cellulose-based hydrogels towards an antibacterial wound dressing.

Guamba, Esteban / Vispo, Nelson Santiago / Whitehead, Daniel C / Singh, Ajaya Kumar / Santos-Oliveira, Ralph / Niebieskikwiat, Dario / Zamora-Ledezma, Camilo / Alexis, Frank

Biomaterials science

2023 Volume 11, Issue 10, Page(s) 3461–3468

Abstract: Hydrogels are promising candidates for wound healing bandages because they can mimic the native skin microenvironment. Additionally, there is increasing growth in the use of naturally derived materials and plant-based biomaterials to produce healthcare ... ...

Abstract	Hydrogels are promising candidates for wound healing bandages because they can mimic the native skin microenvironment. Additionally, there is increasing growth in the use of naturally derived materials and plant-based biomaterials to produce healthcare products with healing purposes because of their biocompatibility and biodegradation properties. In this study, cellulose extracted from biodiverse sources in Ecuador was used as the raw material for the fabrication of hydrogels with enhanced antifouling properties. Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and scanning electron microscopy (SEM) were used to characterize the cellulose and hydrogels.
MeSH term(s)	Cellulose/pharmacology ; Cellulose/chemistry ; Hydrogels/pharmacology ; Hydrogels/chemistry ; Anti-Bacterial Agents/chemistry ; Bandages ; Skin
Chemical Substances	Cellulose (9004-34-6) ; Hydrogels ; Anti-Bacterial Agents
Language	English
Publishing date	2023-05-16
Publishing country	England
Document type	Journal Article
ZDB-ID	2693928-9
ISSN	2047-4849 ; 2047-4830
ISSN (online)	2047-4849
ISSN	2047-4830
DOI	10.1039/d2bm01369j
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Article: Protein Adsorption, Calcium-Binding Ability, and Biocompatibility of Silver Nanoparticle-Loaded Polyvinyl Alcohol (PVA) Hydrogels Using Bone Marrow-Derived Mesenchymal Stem Cells.

Elango, Jeevithan / Zamora-Ledezma, Camilo / Alexis, Frank / Wu, Wenhui / Maté-Sánchez de Val, José Eduardo

Pharmaceutics

2023 Volume 15, Issue 7

Abstract: Several approaches have evolved to facilitate the exploration of hydrogel systems in biomedical research. In this sense, poly(vinyl alcohol) (PVA) has been widely used in hydrogel (HG) fabrication for several therapeutic applications. The biological ... ...

Abstract	Several approaches have evolved to facilitate the exploration of hydrogel systems in biomedical research. In this sense, poly(vinyl alcohol) (PVA) has been widely used in hydrogel (HG) fabrication for several therapeutic applications. The biological properties of PVA hydrogels (PVA-HGs) are highly dependent on their interaction with protein receptors and extracellular matrix (mainly calcium) deposition, for which there is not enough evidence from existing research yet. Thus, for the first time, the functional properties, like protein and mineral interactions, related to the proliferation of mesenchymal stem cells (MSCs) by silver nanoparticle (AgNP)-loaded PVA hydrogels (AgNPs-PVA-HGs) were investigated in the present study. The UV absorption spectrum and TEM microscopic results showed a maximum absorbance of synthesized AgNPs at 409 nm, with an average particle size of 14.5 ± 2.5 nm, respectively. The functional properties, such as the calcium-binding and the protein adsorption of PVA-HG, were accelerated by incorporating AgNPs; however, the swelling properties of the HGs were reduced by AgNPs, which might be due to the masking of the free functional groups (hydroxyl groups of PVA) by AgNPs. SEM images showed the presence of AgNPs with a more porous structure in the HGs. The proliferative effect of MSCs increased over culture time from day 1 to day 7, and the cell proliferative effect was upregulated by HGs with more pronounced AgNPs-PVA-HG. In addition, both HGs did not produce any significant cytotoxicity in the MSCs. The histological (bright light and H&E staining) and fluorescence microscopic images showed the presence of a cytoskeleton and the fibrillar structure of the MSCs, and the cells adhered more firmly to all HGs. More fibrillar bipolar and dense fibrillar structures were seen in the day 1 and day 7 cultures, respectively. Interestingly, the MSCs cultured on AgNPs-PVA-HG produced extracellular matrix deposition on day 7. Accordingly, the present results proved the biocompatibility of AgNPs-PVA-HG as a suitable system for culturing mammalian stem cells for regenerative tissue applications.
Language	English
Publishing date	2023-06-28
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2527217-2
ISSN	1999-4923
ISSN	1999-4923
DOI	10.3390/pharmaceutics15071843
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Article: Heavy metal water pollution: A fresh look about hazards, novel and conventional remediation methods

Zamora-Ledezma, Camilo / Negrete-Bolagay, Daniela / Figueroa, Freddy / Zamora-Ledezma, Ezequiel / Ni, Ming / Alexis, Frank / Guerrero, Victor H

Environmental technology & innovation. 2021 May, v. 22

2021

Abstract: Water pollution is one of the global challenges that society must address in the 21st century aiming to improve water quality and reduce human and ecosystem health impacts. Industrialization, climate change, and expansion of urban areas produce a variety ...

Abstract	Water pollution is one of the global challenges that society must address in the 21st century aiming to improve water quality and reduce human and ecosystem health impacts. Industrialization, climate change, and expansion of urban areas produce a variety of water pollutants. In this work, we discuss some of the most recent and relevant findings related to the release of heavy metals, the possible risks for the environment and human health, the materials and technologies available for their removal. Anthropogenic activities are identified as the main source of the increasing amounts of heavy metals found in aquatic environments. Some of the health hazards derived from repeated exposure to traces of heavy metals, including lead, cadmium, mercury, and arsenic, are outlined. We also give some perspectives about several techniques used to detect heavy metals, as well as about the factors that could affect the contaminant removal. The advantages and drawbacks of conventional and non-conventional heavy metal removal methods are critically discussed, given particular attention to those related to adsorption, nanostructured materials and plant-mediated remediation. Some of the commercial products currently used to eliminate heavy metals from water are also listed. Finally, we point out some the requirements and opportunities linked to developing efficient methods for heavy metal removal, such as the ones that exploit nanotechnologies.
Keywords	adsorption ; arsenic ; cadmium ; climate change ; environmental health ; environmental technology ; heavy metals ; human health ; humans ; industrialization ; lead ; mercury ; remediation ; water pollution ; water quality
Language	English
Dates of publication	2021-05
Publishing place	Elsevier B.V.
Document type	Article
Note	NAL-AP-2-clean
ISSN	2352-1864
DOI	10.1016/j.eti.2021.101504
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Fabrication, Physical-Chemical and Biological Characterization of Retinol-Loaded Poly(vinyl Alcohol) Electrospun Fiber Mats for Wound Healing Applications.

Zamora-Ledezma, Camilo / Hernández, Ana Belén / López-González, Ivan / Elango, Jeevithan / Paindépice, Janèle / Alexis, Frank / González-Sánchez, Manuela / Morales-Flórez, Víctor / Mowbray, Duncan John / Meseguer-Olmo, Luis

Polymers

2023 Volume 15, Issue 12

Abstract: Nowadays, there exists a huge interest in producing innovative, high-performance, biofunctional, and cost-efficient electrospun biomaterials based on the association of biocompatible polymers with bioactive molecules. Such materials are well-known to be ... ...

Abstract	Nowadays, there exists a huge interest in producing innovative, high-performance, biofunctional, and cost-efficient electrospun biomaterials based on the association of biocompatible polymers with bioactive molecules. Such materials are well-known to be promising candidates for three-dimensional biomimetic systems for wound healing applications because they can mimic the native skin microenvironment; however, many open questions such as the interaction mechanism between the skin and the wound dressing material remain unclear. Recently, several biomolecules were intended for use in combination with poly(vinyl alcohol) (PVA) fiber mats to improve their biological response; nevertheless, retinol, an important biomolecule, has not been combined yet with PVA to produce tailored and biofunctional fiber mats. Based on the abovementioned concept, the present work reported the fabrication of retinol-loaded PVA electrospun fiber mats (RPFM) with a variable content of retinol (0 ≤ Ret ≤ 25 wt.%), and their physical-chemical and biological characterization. SEM results showed that fiber mats exhibited diameters distribution ranging from 150 to 225 nm and their mechanical properties were affected with the increasing of retinol concentrations. In addition, fiber mats were able to release up to 87% of the retinol depending on both the time and the initial content of retinol. The cell culture results using primary mesenchymal stem cell cultures proved the biocompatibility of RPFM as confirmed by their effects on cytotoxicity (low level) and proliferation (high rate) in a dose-dependent manner. Moreover, the wound healing assay suggested that the optimal RPFM with retinol content of 6.25 wt.% (RPFM-1) enhanced the cell migratory activity without altering its morphology. Accordingly, it is demonstrated that the fabricated RPFM with retinol content below the threshold 0 ≤ Ret ≤ 6.25 wt.% would be an appropriate system for skin regenerative application.
Language	English
Publishing date	2023-06-16
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2527146-5
ISSN	2073-4360 ; 2073-4360
ISSN (online)	2073-4360
ISSN	2073-4360
DOI	10.3390/polym15122705
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Article ; Online: LCAO-TDDFT-k- ω : spectroscopy in the optical limit.

Lyon, Keenan / Preciado-Rivas, María Rosa / Zamora-Ledezma, Camilo / Despoja, Vito / Mowbray, Duncan John

Journal of physics. Condensed matter : an Institute of Physics journal

2020 Volume 32, Issue 41, Page(s) 415901

Abstract: Understanding, optimizing, and controlling the optical absorption process, exciton gemination, and electron-hole separation and conduction in low dimensional systems is a fundamental problem in materials science. However, robust and efficient methods ... ...

Abstract	Understanding, optimizing, and controlling the optical absorption process, exciton gemination, and electron-hole separation and conduction in low dimensional systems is a fundamental problem in materials science. However, robust and efficient methods capable of modelling the optical absorbance of low dimensional macromolecular systems and providing physical insight into the processes involved have remained elusive. We employ a highly efficient linear combination of atomic orbitals (LCAOs) representation of the Kohn-Sham (KS) orbitals within time dependent density functional theory (TDDFT) in the reciprocal space (k) and frequency (ω) domains, as implemented within our LCAO-TDDFT-k-ω code, applying either a priori or a posteriori the derivative discontinuity correction of the exchange functional Δ
Language	English
Publishing date	2020-06-05
Publishing country	England
Document type	Journal Article
ZDB-ID	1472968-4
ISSN	1361-648X ; 0953-8984
ISSN (online)	1361-648X
ISSN	0953-8984
DOI	10.1088/1361-648X/ab99ea
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Article ; Online: Modifications in Gene Expression in the Process of Osteoblastic Differentiation of Multipotent Bone Marrow-Derived Human Mesenchymal Stem Cells Induced by a Novel Osteoinductive Porous Medical-Grade 3D-Printed Poly(ε-caprolactone)/β-tricalcium Phosphate Composite.

López-González, Ivan / Zamora-Ledezma, Camilo / Sanchez-Lorencio, María Isabel / Tristante Barrenechea, Elena / Gabaldón-Hernández, José Antonio / Meseguer-Olmo, Luis

International journal of molecular sciences

2021 Volume 22, Issue 20

Abstract: In this work, we evaluated the influence of a novel hybrid 3D-printed porous composite scaffold based on poly(ε-caprolactone) (PCL) and β-tricalcium phosphate (β-TCP) microparticles in the process of adhesion, proliferation, and osteoblastic ... ...

Abstract	In this work, we evaluated the influence of a novel hybrid 3D-printed porous composite scaffold based on poly(ε-caprolactone) (PCL) and β-tricalcium phosphate (β-TCP) microparticles in the process of adhesion, proliferation, and osteoblastic differentiation of multipotent adult human bone marrow mesenchymal stem cells (
MeSH term(s)	Alkaline Phosphatase/metabolism ; Calcium Phosphates/chemistry ; Cell Adhesion ; Cell Differentiation/genetics ; Cell Proliferation ; Cells, Cultured ; Gene Expression Regulation ; Humans ; Mesenchymal Stem Cells/cytology ; Osteoblasts/cytology ; Osteogenesis/genetics ; Osteogenesis/physiology ; Polyesters/chemistry ; Porosity ; Printing, Three-Dimensional ; Tissue Scaffolds ; X-Ray Microtomography
Chemical Substances	Calcium Phosphates ; Polyesters ; beta-tricalcium phosphate ; polycaprolactone (24980-41-4) ; Alkaline Phosphatase (EC 3.1.3.1)
Language	English
Publishing date	2021-10-18
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2019364-6
ISSN	1422-0067 ; 1422-0067 ; 1661-6596
ISSN (online)	1422-0067
ISSN	1422-0067 ; 1661-6596
DOI	10.3390/ijms222011216
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Article ; Online: Cyclodextrins in Polymer-Based Active Food Packaging: A Fresh Look at Nontoxic, Biodegradable, and Sustainable Technology Trends.

Velázquez-Contreras, Friné / Zamora-Ledezma, Camilo / López-González, Iván / Meseguer-Olmo, Luis / Núñez-Delicado, Estrella / Gabaldón, José Antonio

Polymers

2021 Volume 14, Issue 1

Abstract: Using cyclodextrins (CDs) in packaging technologies helps volatile or bioactive molecules improve their solubility, to guarantee the homogeneous distribution of the complexed molecules, protecting them from volatilization, oxidation, and temperature ... ...

Abstract	Using cyclodextrins (CDs) in packaging technologies helps volatile or bioactive molecules improve their solubility, to guarantee the homogeneous distribution of the complexed molecules, protecting them from volatilization, oxidation, and temperature fluctuations when they are associated with polymeric matrices. This technology is also suitable for the controlled release of active substances and allows the exploration of their association with biodegradable polymer targeting to reduce the negative environmental impacts of food packaging. Here, we present a fresh look at the current status of and future prospects regarding the different strategies used to associate cyclodextrins and their derivatives with polymeric matrices to fabricate sustainable and biodegradable active food packaging (AFP). Particular attention is paid to the materials and the fabrication technologies available to date. In addition, the use of cutting-edge strategies, including the trend of nanotechnologies in active food packaging, is emphasized. Furthermore, a critical view on the risks to human health and the associated updated legislation is provided. Some of the more representative patents and commercial products that currently use AFP are also listed. Finally, the current and future research challenges which must be addressed are discussed.
Language	English
Publishing date	2021-12-28
Publishing country	Switzerland
Document type	Journal Article ; Review
ZDB-ID	2527146-5
ISSN	2073-4360 ; 2073-4360
ISSN (online)	2073-4360
ISSN	2073-4360
DOI	10.3390/polym14010104
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Article ; Online: Persistent organic pollutants: The trade-off between potential risks and sustainable remediation methods.

Negrete-Bolagay, Daniela / Zamora-Ledezma, Camilo / Chuya-Sumba, Cristina / De Sousa, Frederico B / Whitehead, Daniel / Alexis, Frank / Guerrero, Victor H

Journal of environmental management

2021 Volume 300, Page(s) 113737

Abstract: Persistent Organic Pollutants (POPs) have become a very serious issue for the environment because of their toxicity, resistance to conventional degradation mechanisms, and capacity to bioconcentrate, bioaccumulate and biomagnify. In this review article, ... ...

Abstract	Persistent Organic Pollutants (POPs) have become a very serious issue for the environment because of their toxicity, resistance to conventional degradation mechanisms, and capacity to bioconcentrate, bioaccumulate and biomagnify. In this review article, the safety, regulatory, and remediation aspects of POPs including aromatic, chlorinated, pesticides, brominated, and fluorinated compounds, are discussed. Industrial and agricultural activities are identified as the main sources of these harmful chemicals, which are released to air, soil and water, impacting on social and economic development of society at a global scale. The main types of POPs are presented, illustrating their effects on wildlife and human beings, as well as the ways in which they contaminate the food chain. Some of the most promising and innovative technologies developed for the removal of POPs from water are discussed, contrasting their advantages and disadvantages with those of more conventional treatment processes. The promising methods presented in this work include bioremediation, advanced oxidation, ionizing radiation, and nanotechnology. Finally, some alternatives to define more efficient approaches to overcome the impacts that POPs cause in the hydric sources are pointed out. These alternatives include the formulation of policies, regulations and custom-made legislation for controlling the use of these pollutants.
MeSH term(s)	Environmental Pollutants ; Food Chain ; Humans ; Persistent Organic Pollutants ; Pesticides/analysis ; Soil
Chemical Substances	Environmental Pollutants ; Pesticides ; Soil
Language	English
Publishing date	2021-09-15
Publishing country	England
Document type	Journal Article ; Review
ZDB-ID	184882-3
ISSN	1095-8630 ; 0301-4797
ISSN (online)	1095-8630
ISSN	0301-4797
DOI	10.1016/j.jenvman.2021.113737
Database	MEDical Literature Analysis and Retrieval System OnLINE

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