Beatriz Liliana España-Sánchez

Centro De Investigación Y Desarrollo Tecnológico En Electroquímica · Subdirección de Investigación en Salud/Dirección de Ciencia

Electrospun poly(3,4-ethylene dioxythiophene) polystyrene sulfonate (PEDOT: PSS) nanofibers were deposited onto flexible polyethylene terephthalate (PET) substrates to obtain electrodes for flexible and all solid-state supercapacitors (SCs). The solution used for electrospinning contained a conducting polymer (PEDOT:PSS), an insulating polymer (pol...

Herein we report the synthesis of a piezopolymer composed of chitosan (CS)/hydroxylated BaTiO3 (OH-BTO) nanoparticles with enhanced biocompatibility, non-toxicity, and piezoelectric behavior that can be advantageously used in biomedical applications. Our CS/OH-BTO nanocomposites exhibit piezoelectric coefficient (d33 = 11.29 pC/N) between those of...

The process of disinfection of wastewater must use friendly materials with the environment that achieve the inhibition of bacterial growth, aiming to improve the quality of the water. In this study, electrospun nanocomposites CS (chitosan)/AgNPs (silver nanoparticles) was developed for wastewater disinfection through filtration. First, AgNPs were s...

The present study describes the harnessing of revalued cow milk (denoted as waste milk) for fabricating casein fibers (CAS) with enhanced mechanical performance and antibacterial properties by the electrospinning method. For this purpose, polyethylene oxide (PEO) was employed (10 and 20 wt. %) as a binder for the appropriate electrospun CAS fibers....

We report the facile ultrasound-assisted synthesis of copper nanoparticles (CuNPs) using blueberries extract (Vaccinium corymbosum) under environmental conditions and their incorporation into face masks as an effective antibacterial additive. For this purpose, the hydro-alcoholic blueberry extract was combined 1:1 with a metal precursor (CuSO4). Th...

Our work describes the green synthesis of silver sulfide nanoparticles (Ag2S NPs) and their formulation into polycaprolactone fibers (PCL), aiming to improve the multifunctional biological performance of PCL membranes as scaffolds. For this purpose, an extract of rosemary (Salvia rosmarinus) was employed as a reducing agent for the Ag2S NPs, obtain...

Linear aliphatic oligoesters derived from ε-caprolactone (CL) were synthesized by ring-opening polymerization (ROP) using terpene alcohols that have antibacterial activity as initiators (nerol, geraniol, β-citronellol and farnesol). Ammonium decamolybdate (NH4)8[Mo10O34] was used as a catalyst. From previous oligoesters, monodisperse species of mon...

There is an increasing interest in gold nanoparticles due to their excellent properties, and high surface-to-volume ratio. There are several physicochemical methods to synthesize them, however, green synthesis has gained particular interest when nanoparticles are used for biomedicine or environmental applications, given that this method is simple,...

This study investigates the antibacterial potential of cobalt-based zeolitic imidazolate frameworks (ZIFs)-specifically, ZIF-67, ZIF-L-Co, and ZIF-9-for antimicrobial coatings on high-contact surfaces. Synthesized via solvothermal methods, ZIFs containing 2-methyl-imidazole (2MIm) and benzimidazole (PhIm) ligands exhibited varied bactericidal effic...

Our work evaluates the impact of crystallization rate during the synthesis of α-MoO3 nanorods and their bactericidal performance against Gram (+) S. aureus and Gram (−) E. coli. For this purpose, α-MoO3 nanorods were synthesized by varying the crystallization times to 12, 24, and 48 h. XRD patterns reveal that crystallization time changes crystal s...

Biopolymer-based films are a promising alternative for the food packaging industry, in which petrochemical-based polymers like low-density polyethylene (LDPE) are commanding attention because of their high pollution levels. In this research, a biopolymer-based film made of chitosan (CS), gelatin (GEL), and glycerol (GLY) was designed. A Response Su...

Silver nanoparticles (AgNP) are widely used globally due to their numerous properties, mainly because of their antimicrobial activity. However, the need for further regulations and legislation regarding their presence in products has led to concerns about their biosecurity, necessitating relevant biological studies at different levels. The present...

The impact of zwitterionic graphene oxide (GO‐Arg) nanostructures into polyethersulfone (PES) membranes was studied, aiming to perform mixed matrix membranes (MMMs) with combined antibacterial and antifouling properties. For this purpose, 0.25, 0.50, and 1.0 wt% of GO‐Arg were incorporated through the phase inversion method. The chemical compositio...

ur work describes the surface modification of carbon dots (CDs) synthesized by hydrothermal method from natural sources and their potential viricidal activity. A mix of Aloe/green tea/lemon juice extract was compared with strawberry/ginger, obtaining semispherical CDs of ca. 6 nm, with a high excitation-emission peak associated with the characteris...

Effective antimicrobial activity on highly contaminated surfaces, like in sanitary, requires the development of novel functional nanomaterials. In this work, we synthesized zeolitic imidazolate frameworks (ZIFs, 7 and 8) and validated their dual antibacterial/antiviral activity for real applications in sanitary. ZIF-7 and ZIF-8 presented the polygo...

The Escherichia coli Keio mutant collection has been a tool for assessing the role of specific genes and determining their role in E. coli physiology and uncovering novel functions. In this work, specific mutants in the DNA repair pathways and oxidative stress response were evaluated to identify the primary targets of silver nanoparticles (NPs) and...

Mucho se ha escuchado acerca del uso indiscriminado de antibióticos y su impacto en la generación de súper bacterias. Sin embargo, ¿sabes qué es la resistencia bacteriana y cómo estos microorganismos pueden comprometer tu salud y la de tus seres queridos? Y no solo eso, ¿sabías que la nanotecnología puede evitar el crecimiento y la propagación de e...

In this work, a microfluidic prototype based on polymeric materials was developed to monitor surface processes using surface-enhanced Raman spectroscopy (SERS), keeping the reagents free of environmental contamination. The prototype was fabricated on poly(methyl methacrylic acid) (PMMA). A micrometric membrane of a functional organic polymer (FOP)...

This paper reports the synthesis and electrochemical performance of electrospun polyaniline (PANI) nanofiber membranes that work as high‐performance electrodes in an all‐textile supercapacitor (SC). The electrospun separator membrane consists of a mix of polyacrylonitrile (PAN) and poly (ethylene sulfonate) (PES). The all‐textile SC consists of a P...

Rechargeable Zn-air batteries (ZABs) are safe energy storage systems, making them attractive for different applications, while their attractiveness can be boosted by adding natural constituents for eco-friendly disposability. In this work, biopolymeric hydrogels (biohydrogels) were synthesized using deep eutectic solvents (DES), poly(itaconic acid)...

In this work, the influence of the Sargassum natans I alga extract on the morphological characteristics of synthesized ZnO nanostructures, with potential biological and environmental applications, was evaluated. For this purpose, different ZnO geometries were synthesized by the co-precipitation method, using Sargassum natans I alga extract as stabi...

This work explored the combined antibacterial and selective dye adsorption properties of graphene oxide (GO) incorporated into nanostructured polyethersulfone (PES) membranes. For this purpose, GO synthesis was performed by the Hummers method and characterized by Fourier transform infrared, X‐ray diffraction, Raman spectroscopy, and scanning electr...

Green surface modification of graphene oxide (GO) using lysine (Lys) under different pH conditions was studied, aiming to activate the specific functional group of the amino acid structure: carboxylic acid (pH 2), the primary amine of α-carbon (pH 9.8) and, the primary amine of the lateral chain and α-carbon (pH 12), promoting three interaction mec...

The technology for reproducing orchids in vitro has had to evolve due to the demand for these plants and the high cost of the biotechnology used due to the agar, the gelling agent. Consequently, research has tended to search for natural substitutes for agar. Our work describes the use of pectin and mucilage hydrocolloids extracted from the local wa...

Photodynamic Therapy (PDT) is an alternative technique for cancer treatment and other diseases. To have a photodynamic effect, it is imperative to have light, molecular oxygen, and a photosensitizer. A photosensitizer is a specialized molecule that absorbs light to stimulate the promotion from ground state to a triplet excited state, that interacts...

Radiofrequency (RF) plasma treatment was employed as an alternative method to synthesize sulfur deposits on polyethylene terephthalate (PET) surfaces. In this regard, Optical Emission Spectroscopy (OES) and Energy Dispersive Spectroscopy (EDS) analysis confirmed the obtention of deposits composed of 100% sulfur after the dissociation of hydrogen su...

The present work shows the synthesis of ZnO nanoparticles through a green method, using sargassum extracts, which provide the reducing and stabilizing compounds. The conditions of the medium in which the reaction was carried out was evaluated, that is, magnetic stirring, ultrasound assisted, and resting condition. UV-Vis, FTIR spectroscopy, and X-r...

The present study describes the antibacterial behavior and the bacterial resistance analysis of extremophile Pseudomonas aeruginosa in contact with copper nanoparticles (CuNPs). For this purpose, green synthesis of CuNPs was performed by combined ultrasound-assisted and chemical reduction methods, obtaining semispherical CuNPs ranging from ca. 4-9...

Silver‐based antibacterial nanoparticles have demonstrated indices of possible bacterial resistance after consecutive periods of time, limiting their application on antibacterial surfaces. In this work, we fabricate electrospun composites of polyethersulfone (PES) and silver nanoparticles (AgNPs), displaying highly‐persistent antibacterial behavior...

In this work, graphene/zinc oxide nanoparticles (G/ZnO NPs) were synthesized by a metathesis‐assisted molten salt route. The methodology followed has outstanding features such as innovative, environmentally friendly, high‐yield, efficient, and straightforward. In addition, poly(ether‐block‐amide) (PEBA)‐based mixed matrix membranes (MMMs) filled wi...

Herein, we report the synthesis of Au nanoparticles (AuNPs) in chitosan (CTS) solution by chemically reducing HAuCl4. CTS was further functionalized with glycidyl methacrylate (chitosan-g-glycidyl methacrylate/AuNP, CTS-g-GMA/AuNP) to improve the mechanical properties for cellular regeneration requirements CTS-g-GMA/AuNP. Our nanocomposites promote...

Silver nanoparticles (AgNPs), due to their metallic nature, are increasingly used in biological, optical, and electrical applications. Some reports indicate that AgNPs can induce damage in the central nervous system (CNS), yet little is known about the physiological responses to any such damage. The goal of this work was to investigate the histolog...

In the present work, ZnO nanostructures with flower morphology were synthesized and self-assembled by a green approach using an Aloysia triphylla leaves extract. The extract acted as a reducing and stabilizing agent. Moreover, the Aloysia triphylla extract showed the ability to order the nanostructures and form a flower-like arrangement. The format...

Carbon dots (CDs) synthesized using Cinchona pubescens Vahl from the hydrothermal method displayed blue emission radiation, pH dependency, homogeneous sizes, colloidal stability in water, and antibacterial features. They consist of graphene oxide and reduced graphene oxide, attributed to the antioxidant species extracted from the Cinchona pubescens...

In recent years, the food, pharmacy, and cosmetic industries have focused on the search of natural compounds with antimicrobial and antioxidant properties; commonly, these compounds are obtained from Kingdom plantae. The aim of the present work is comparing antibacterial and antioxidant capacity of Annona cherimola Mill leaves, using different extr...

This work reports, for the first time, the synthesis of silver nanoparticles using extracts of the species of Sargassum natans and Sargassum fluitans (AgNPs-S). Their antibacterial and catalytic properties are compared with silver nanoparticles obtained by chemical synthesis (AgNPs-C). The characterization of AgNPs-S and AgNPs-C was carried out usi...

The chemical functionalization of graphene oxide nanosheets (GO) with aliphatic amino acids such as arginine and lysine (Arg and Lys), was studied to determine the zwitterionic behavior of nanomaterials under specific pH conditions (Arg at pH 8 and Lys at pH 9.8). For this purpose, the primary amine of each amino acid was previously activated, aimi...

Entamoeba histolytica is a pathogen that during its infective process confronts the host defenses, which damages the amoebic plasma membrane (PM), resulting in the loss of viability. However, it is unknown whether amoebic trophozoites are able to repair their PM when it is damaged. Acid sphingomyelinases (aSMases) have been reported in mammalian ce...

Background Marine sessile organisms display a color palette that is the result of the expression of fluorescent and non-fluorescent proteins. Fluorescent proteins have uncovered transcriptional regulation, subcellular localization of proteins, and the fate of cells during development. Chromoproteins have received less attention until recent years a...

The synthesis and applications of anisotropic nanostructures have attracted much attention in the last decade. The nanoflower-type structures are one of the nanomaterials with anisotropic structures most investigated because of owing to high densities of edges, corners, and stepped atoms present on their nano-petals. Here, silver nanoparticles obta...

Correlation between electrical/antibacterial properties of CS/Cu films were done.  Cu chelation-induced mechanism during the Cu NPs formation in CS during synthesis.  Electrical conductivity demonstrates percolation threshold at CuNPs volume fraction ca. 0.00143.  Percolation threshold and saturation in antibacterial activity depends of CuNPs co...

We report the synthesis and in vitro evaluation of dual-function chitosan-silver nanoparticles (CTS-AgNPs) films with potential applications as wound dressings. We attempted to formulate nanocomposite films with appropriate AgNPs concentrations to simultaneously display antibacterial activity and suitability for cell culture. Nanocomposites were ob...

Background Propagation of pathogens has considered an important health care problem due to their resistance against conventional antibiotics. The recent challenge involves the design of functional alternatives such as nanomaterials, used as antibacterial agents. Early stages of antibacterial damage caused by metallic nanoparticles (NPs) were studie...

We report the combined antibacterial/tissue regeneration responses to thermal burns promoted by functional chitosan/silver nanocomposites (CS/nAg) with ultralow silver content (0.018 wt. %, 7-30 nm). Our approach allows one to produce CS/nAg nanocomposites without silver nanoparticles (nAg) agglomeration, with bactericide potency higher than 1 wt....

Differences onherringbonemolecular arrangement in two forms of long-chain 1,ω-alkanediols (C n H2n+2O₂ withn= 10, 11, 12, 13) are explained from the analysis of O-H···O hydrogen-bond sequences in infinite chains and the role of a C-H···O intramolecular hydrogen-bond in stabilization of agauchedefect, as well as the inter-grooving effectiveness on m...

This study reports on the rheology of the gelation kinetics of raw chitosan (CTS) solutions (2% w/v) produced by enzymatic hydrolysis of urea at different urea concentrations (40, 50, 60, 80, and 100 mM) in the presence of urease at 1 U/mL. Viscoelastic parameters and pH values were evaluated during gelation process and the rheological properties o...

El presente trabajo describe la preparación de nanocompositos formulados a partir de quitosano (QS)/nanopartícu- las de cobre (nCu) con características antibacterianas y aplicación potencial en ingeniería de tejidos. Para ello, se prepararon nanocompositos mediante mezclado en solución asistido con ultrasonido con el objetivo de incremen- tar la di...

Surface modification of copper nanoparticles (CuNPs) was performed in a radiofrequency plasma reactor using acrylic acid, acrylonitrile, and methyl methacrylate monomers. Treated and untreated CuNPs were analyzed by thermogravimetrical analysis, X-ray diffraction (XRD), transmission electronic microscopy, energy dispersive X-ray spectroscopy, and F...

This work reports the preparation of nanocomposites based on polypropylene and copper nanoparticles by melt blending and their surface treatment by argon plasma in order to increase the antibacterial activity of obtained nanocomposites. Surface analyses demonstrates that argon plasma treatment modifies the surface of the composite, increasing the e...

Argon surface plasma treatment (APT) of poly(propylene)/silver (PP/Ag) and poly(propylene)/ copper (PP/Cu) nanocomposite improves their antibacterial properties against pathogenic bacteria. Dispersions of PP/Ag and PP/Cu nanocomposites were prepared by sonication assisted melt mixing 0.05, 0.5, and 5 w/w% metal nanoparticle/polymer compositions, an...

Back Cover: Argon plasma treatment of poly(propylene)/silver and poly(propylene)/copper nanocomposites increases the exposure of surface nanoparticles. Plasma treatment removes the polymer from the nanoparticle surface, exposing the metallic nanoparticles, modifying the surface properties and increasing the antimicrobial properties of nanocomposite...

Back Cover: Argon plasma treatment of poly(propylene)/silver and poly(propylene)/copper nanocomposites increases the exposure of surface nanoparticles. Plasma treatment removes the polymer from the nanoparticle surface, exposing the metallic nanoparticles, modifying the surface properties and increasing the antimicrobial properties of nanocomposite...

Back Cover: Argon plasma treatment of poly(propylene)/silver and poly(propylene)/copper nanocomposites increases the exposure of surface nanoparticles. Plasma treatment removes the polymer from the nanoparticle surface, exposing the metallic nanoparticles, modifying the surface properties and increasing the antimicrobial properties of nanocomposite...

Argon surface plasma treatment (APT) of poly(propylene)/silver (PP/Ag) and poly(propylene)/ copper (PP/Cu) nanocomposite improves their antibacterial properties against pathogenic bacteria. Dispersions of PP/Ag and PP/Cu nanocomposites were prepared by sonication assisted melt mixing 0.05, 0.5, and 5 w/w% metal nanoparticle/polymer compositions, an...

Unique properties of carbon nanotubes (CNTs) and Nylon-6 were combined to obtain nanocomposites through in situ polymerization. For this purpose, plasma-polymerized CNTs (CNTM) and raw CNTs were added to in situ polymerization of epsilon-caprolactam and 6-aminocapropic acid to obtain nanocomposites with 2 and 4% wt/wt of nanotubes. The morphology,...

Plasma surface activation and antibacterial properties of nanocomposites of polypropylene/silver nanoparticles (PP/nAg) and nylon-6/silver nanoparticles (Ny6/nAg) were investigated. The nanocomposites were prepared by melt blending assisted by ultrasound, while surface activation was achieved by means of argon plasma. To evaluate the antimicrobial...

In this report we discuss the preparation and characterization of semi-conducting polymer nanocomposites of polyethylene terephthalate (PET), containing in weight 1% and 2% multi-walled carbon nanotubes (MWCNT), unmodified (MWCNT) and modified by means of ethylene glycol plasma (MWCNT-OH). We identified by infrared spectroscopy the presence of a fu...