WorldCat Identities

Pérez García, M. Lluïsa (Maria LLuïsa)

Overview
Works: 13 works in 23 publications in 3 languages and 23 library holdings
Roles: Author
Publication Timeline
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Most widely held works by M. Lluïsa Pérez García
Betaïnes d'azolat piridini (azoli) i derivats amb diversos agrupaments interanulars : estudis en la sèrie del benzimidazole : síntesi, estructura i propietats by M. Lluïsa Pérez García( Book )

3 editions published between 1992 and 2008 in Catalan and English and held by 3 WorldCat member libraries worldwide

Micro and nanotools for sensing and therapy by Ana Mafalda Nunes Rodrigues( Book )

3 editions published in 2014 in English and Spanish and held by 3 WorldCat member libraries worldwide

Aquesta tesi s'enfoca a trobar aplicacions de la química supramolecular en el camp de la Nanomedicina. Els processos supramoleculars permeten obtenir estructures amb una aproximació coneguda com "bottom-up", que consisteix en la interacció d'unitats petites com àtoms, ions, molècules, formant unitats funcionals més grans. El nostre treball s'ha centrat en nanomaterials les estructures dels quals es poden formar mitjançant processos de autoassemblatge: hidrogels, nanopartícules d'or, o monocapes de biomolècules en superfícies. Els hidrogels es van obtenir amb un compost amb una estructura de tipus gemini basada en imidazoli que pertany a una família estructural que pot formar micel·les i té la capacitat de reconèixer i incorporar anions. Es va estudiar la possibilitat d'incorporar fàrmacs en el gel i alliberar aquests fàrmacs. Les corbes d'alliberament del fàrmac es van determinar in vitro. El mateix compost també es va utilitzar per sintetitzar partícules d'or en un sistema bifàsic. La seva natura anfifílica, pot exercir el doble rol d'agent de transferència de fase i estabilitzador. També es va provar amb ibuprofè la incorporació i alliberament de fàrmacs in vitro. També vam sintetitzar nanopartícules en aigua, que també van incorporar i alliberar in vitro un fàrmac model. També hem utilitzat anàlegs cíclics amb estructura de bis-imidazoli per sintetitzar nanopartícules en sistema bifàsic. Les nanopartícules poden incorporar l'ibuprofèn, però la quantitat que s'allibera és més baixa. Els gels obtinguts es van utilitzar com plantilla per la síntesi de les nanopartícules d'or, que van resultat amb dispersió de mida millorada. Addicionalment vam conjugar pèptids cíclics amb nanopartícules, sintetitzades amb dos mètodes alternatius: el mètode de citrat i en metanol. La síntesi es fa amb un tiol que conté un grup funcional que es va utilitzar per reaccionar amb els pèptids. Finalment una part de la tesi s'ha dedicat a la biofuncionalització de superfícies. Així, vam formar monocapes en superfícies amb polímers que es coordinen amb lantànids per construir termòmetres moleculars, i monocapes en superfícies i en puntes de sondes de microscopi de rastreig, seguida de conjugació amb biomolècules (biotina i avidina) amb l'objectiu de estudiar interaccions entre lligand i receptor
Micro- and nanomaterials for drug delivery in skin diseases by David Limón Magaña( Book )

2 editions published in 2017 in English and held by 2 WorldCat member libraries worldwide

Supramolecular strategies to control the assembly of organic-based materials by Marta Riba Moliner( Book )

2 editions published in 2016 in English and held by 2 WorldCat member libraries worldwide

Synthesis and functionalization of nano- and micro-particles for sensing and therapy in living cells by Oriol Penon Esteva( Book )

2 editions published between 2013 and 2014 in English and held by 2 WorldCat member libraries worldwide

In the present thesis Supramolecular chemistry is exploited to approach applications in the area of Nanomedicine, and it is, focused on the design and preparation of different micro and nanotools for sensing and therapy, in living cells. Initially, the combination of silicon surface chemistry with the incorporation of bioactive molecules has been investigated in order to obtain a potentially microtool suitable for cell tagging. Furthermore, the design and synthesis of organic compounds as intracellular chemosensors was also explored. On the other hand, this report also includes the synthesis and characterization of dissymmetrical porphyrin derivatives and their subsequent incorporation to metal nanoparticles (gold and iron oxide) for their use in photodynamic therapy (PDT), due to their capacity to produce reactive oxygen species after irradiation, inducing the cell death. The preparation of novel metallo-porphyrins as components of molecular machines was also achieved. First, the formation of self-assembled monolayers (SAM) on polysilicon surfaces was investigated, using different silanes to obtain a functionalization protocol which can be easily repetitive and effective. Thus, three silanes with different functional groups, an aldehyde, an epoxide and an activated ester, have been tested to prepare a SAM and subsequently, prompting us to immobilize a bioactive molecule. Different parameters of the functionalization methodology have been examined, such as the silanization time, deposition method, the type of solvent and silane concentration. Once the SAM formation was optimized, the immobilization of the protein what germ agglutinin (WGA) was achieved, because its ability of cell membrane recognition. The WGA used, included a fluorescent dye (Texas red) to be able to characterize the immobilization of the protein on a silicon surface by fluorescence microscopy, and similar successful results were obtained in the three different silanes used. The same methodology (SAM formation and WGA immobilization) was subsequent applied in silicon encoded microparticles designed for tagging cells. Experiments using mouse embryos have been performed to determine the extracellular adhesion level of the encoded microparticles, resulting above 90 % in all cases. Proper immobilization of WGA protein was the key factor in cell labeling, because WGA recognizes specifically certain carbohydrates expressed in the external membrane (zona pellucida) of the embryo. Synthesis and immobilization of an aminoanthracene derivative as pH sensor was carried out, and its subsequent immobilization on silicon microparticles was achieved. Fluorescence spectroscopy measurements demonstrated that the aminoanthracene derivative immobilized on silicon microparticles could be a potential microtool for sense intracellular pH. Fluorescence spectroscopy experiments showed an important increase at acid pH, whereas from pH 7 to pH 12 the fluorescence emission was very low. On the other hand, aminoanthracene incorporating an aza-crown ether was also prepared as a possible candidate for calcium sensing. Preliminary studies using fluorescence spectroscopy, demonstrated a good selectivity for calcium in comparison with other cations such as magnesium, sodium and potassium. Dissymmetrical porphyrin derivatives have been synthesized and then immobilized on gold and iron oxide nanoparticles, obtaining water soluble metallic nanoparticles incorporating the photosensitizer. The capacity to produce singlet oxygen to induce the cell death following irradiation was investigated, resulting porphyrin immobilized gold or iron oxide nanoparticles. Thus, the prepared porphyrin derivatives and their corresponding nanotools exhibited a high formation of singlet oxygen, resulting nanotools potentially suitable for PDT. Otherwise, anti-erbB2 antibody, a specific antibody for a membrane receptor overexpressed in breast cancer cells, was immobilized onto water soluble porphyrin-gold nanoparticles. Preliminary experiments in a breast cancer cell line, demonstrated the capacity of the porphyrin-antibody-gold nanoparticle to produce the cell death following irradiation. Finally a metallo-porphyrins derivative was synthesized and characterize as a promising component for molecular rotors
Self-assembled monolayers and patterned surfaces derived from them as templates for the growth of chiral crystals by Ángela Bejarano Villafuerte( Book )

2 editions published in 2013 in English and held by 2 WorldCat member libraries worldwide

El proyecto de investigación presentado en esta Tesis tiene como principal objetivo establecer el efecto de las monocapas auto-ensambladas (SAMs) quirales en la nucleación y crecimiento cristalino de compuestos orgánicos, y encontrar las condiciones ideales para favorecer la nucleación heterogénea y su consecuente crecimiento cristalino. La investigación realizada detalla el estudio realizado para conseguir la cristalización controlada sobre superficies funcionalizadas de determinados compuestos quirales y sales diastereoméricas. Para ello se realizaron estudios de cristalización de mencionados compuestos sobre diferentes superficies funcionalizadas. El estudio de la cristalización controlada sobre superficies funcionalizadas comienza por la funcionalización de dicha superficie con phencyphos 4-metilentiol, la cual proporcionara resultados muy prometedores debido a su influencia, demostrada en esta tesis, sobre el proceso de cristalización. La cristalización de phencyphos sobre SAMs de este compuesto, no es controlada y presenta diferentes orientaciones. El disolvente es crucial ya que tiene una enorme influencia en el proceso, según el disolvente empleado en la cristalización de phencyphos sobre superficies funcionalizadas, en el caso de usar isopropanol se obtienen los cristales ramificados, un crecimiento muy peculiar. El método conocido como impresión por microcontacto (microcontact printing en inglés) ofrece un sistema en la superficie que permite favorecer el transporte de masa hacia la zona deseada de la superficie. Las cristalizaciones sobre superficies micropaternadas, tanto de phencyphos como de la sal diastereomérica (p-metilphencyphos y feniletilamina) se han conseguido controlar tras un estudio detallado del efecto del disolvente, el tiempo de la superficie en la disolución, la forma del patrón en superficie, los tioles combinados en superficie y la velocidad de evaporación
Novel ᴫ-functional components of micro- and nanoparticles for nanomedicine by María Elisa Alea Reyes( Book )

2 editions published in 2017 in English and held by 2 WorldCat member libraries worldwide

"The present thesis is included in the area of Nanomedicine and supramolecular chemistry, focused on the design and preparation of different nano and microtools for delivery, therapy and sensing. Initially, the synthesis and characterization of structures derived from gemini-type pyridinium amphiphiles were reported. They have the ability to play multiple roles such as transfer agent and stabilizer, as well as ionophores, and also are responsible for the preparation, stability, and delivery properties of the gold nanoparticles (AuNPs), which gold core is stabilized by the anions present in the bis-pyridinium salts. The gold nanoparticles synthesized proved stable and to have low polydispersity and showed the ability to incorporate piroxicam. Therefore, the in vitro release of 3·AuNPs and 4·AuNPs at two different pH values (7.4 and 5.5) proves a faster release profile at pH 7.4, indicating their suitability as promising materials for delivery in physiological conditions. On the other hand, this report also includes the synthesis and characterization of porphyrin derivatives as photosensitizers in particular metalloporphyrins and their subsequent incorporation to different vehicles such as gold nanoparticles, microparticles (polysilicon-gold) and gold nanorods for their use in photodynamic therapy, due to their capacity to produce reactive oxygen species after irradiation, inducing the cell death. The successfully functionalization of this vehicles were followed by UV-visible absorption spectroscopy, High-Resolution Transmission Electron Microscopy (HRTEM) or Transmission Electron Microscopy (TEM), Dynamic Light Scattering (DLS), X-ray Photoelectron Spectroscopy (XPS), Thermogravimetric analysis (TGA), Fluorescence Spectroscopy, contact angle measurements and fluorescence microscopy. Additionally, the formation of self-assembled monolayers (SAMs) on polysilicon substrates (wafers and microparticles) was investigated, using different immobilization methodologies (covalent and non-covalent) in order to obtain a functionalization protocol which can be easily repetitive and effective. Firstly, this substrates were functionalized with two groups of compounds (pyridinium and imidazolium salts) used as host in the subsequent incorporation of the Zn(II) porphyrin with a high potential to be used in PDT. The immobilization of the different hosts was following by contact angle, while the presence of the Zn(II) porphyrin was confirmed by fluorescence microscopy. The concentration of the photosensitizer incorporated on the polysilicon microparticles was found in the range of 2.2-2.6 µM. On the other hand, a release study of the incorporated porphyrin during a week was performed, resulting in a very low percentage of the total incorporated porphyrin. This result indicates that a stable interaction is established between the porphyrin and the host on the surface. Finally, we describe the non-covalent functionalization of polysilicon substrates (wafers and microparticles) with gemini-type amphiphilic bipyridinium salts (1·4PF6- 3·4PF6), witch act as host for the subsequent incorporation of the neurotransmitters Dopamine hydrochloride (Dop), Serotonin hydrochloride (Ser), Adrenaline hydrochloride (Adr) and Noradrenaline hydrochloride (Nor), in order to obtain the optimum system potentially suitable for sensors of compounds with electron rich groups. The successfully functionalization of the polysilicon substrates was followed by contact angle measurements. Additionally, fluorescence microscopy was used to detect the complex bis-bipyridinium salt-neurotransmitter in both substrates showed an increase on the fluorescence intensity on the substrates functionalized with the bis- bipyridinium salts and subsequent incorporation of the neurotransmitters respect to the controls. Polysilicon surfaces functionalized with 1·4PF6 and subsequent incorporation of Dop or Ser showed the higher values of fluorescence intensity of 71 and 72%, respectively. In this context the bis-bipyridinium 1·4PF6 and neurotransmitters Dop or Ser were selected to functionalize polysilicon microparticles. 1·4PF6 was neither cytotoxic nor genotoxic to the cell lines studied 3T3/NIH, HepG2 and CaCo-2 at the maximum concentration tested of 500 µg/mL. With our work, we set up the non- covalent functionalization methodology to develop a microsystem potentially useful for drug sensors purposes." -- TDX
Diseño y caracterización de sistemas de liberación de fármacos basados en nanopartículas metálicas y ácido hialurónico by Laura Vivero Sanchez( Book )

2 editions published in 2014 in Spanish and held by 2 WorldCat member libraries worldwide

El EDS es un sistema liberador de fármacos antitumorales compuesto por una AuNP recubierta de ácido hialurónico tiolado (HASH). El HASH, además de proteger las nanoparticulas metálicas, es reconocido por el receptor CD44, proteína sobreexpresada en células tumorales. Durante esta tesis se han estudiado diferentes candidatos, trabajando tanto la síntesis de diferentes tamaños de AuNPs, como la tiolación de HASH de diferentes pesos moleculares. Además se han puesto a punto las técnicas necesarias para la correcta caracterización físico-química y biológica de los candidatos. Mediante experimentos in vitro se concluyó que la internalización y la eficacia fue mayor con el sistema formado por AuNPs de 12 nm de diámetro y HASH con un tamaño de 30-50 kDa (EDS1). Los fármacos escogidos para validar el sistema EDS1 fueron el cisplatino, el oxaliplatino y el 5-fluorouracilo. Se conjugaron al EDS1 mediante diferentes vías de síntesis. Se utilizaron ligandos específicos o incluso síntesis directas al ácido hialurónico, donde el enlace con el fármaco era sensible al cambio de pH. La caracterización físico-química y biológica confirmaron que el EDS1 conjugado a cisplatino y oxaliplatino mejoraba el leso de los fármacos en células tumorales de páncreas (Panc-1). Sin embargo, con el 5-fluorouracilo no se encontró un sistema para validar el EDS
Soft nanomaterials from bis-imidazolium amphiphiles by Lucía Casal Dujat des Allimes( )

1 edition published in 2010 in English and held by 1 WorldCat member library worldwide

Auto-acoblament de sistemes macrocíclics oligocatiònics i aplicació a arquitectures moleculars mecànicament entrellaçades by Susana Ramos Truque( )

1 edition published in 2002 in Catalan and held by 1 WorldCat member library worldwide

Estudis en la síntesi d'alcaloides indòlics : transfromacions sobre la desetildasicarpidona by M. Lluïsa Pérez García( )

1 edition published in 1986 in Spanish and held by 1 WorldCat member library worldwide

Multi-functionalization of micro- and nanoparticles for cancer theranostics by Ezhil Amirthalingam( )

1 edition published in 2018 in English and held by 1 WorldCat member library worldwide

This thesis has its main focus on developing multi-functional nanomaterials, that we called nano- and microtools through two different approaches, top-down to provide support and bottom up to give functionality to prepare nanomaterials for diagnosis and therapy in cancer cells (theranostics). It includes functionalization of inorganic and or metallic nano- and microparticles with natural and synthetic receptors capable of acting as sensors to monitor different cellular parameters in living cells and deliverers specifically for diagnosis and therapy in cancer cells (theranostics). For this purpose, we used micro- and nanoparticles as substrates, made up of polysilicon or polysilicon-gold and gold nanoparticles, and functionalized them with (bio)molecules. The first objective was to develop a novel microtool for cell adhesion. For this purpose specially designed polysilicon microparticles of different shapes and sizes were chemically modified, to sense carbohydrates present on tumour cell membranes. An optimized protocol for bio-functionalization of polysilicon microparticles with lectins (WGA and Con A), both on surfaces and in suspension, was developed. Influence of different shapes in bio-functionalization of the microparticles was also observed. The final yield of the number of bio-functionalized microparticles was between 12-21 % with a major loss of approximately 50 % of microparticles during the activation step. These bio-functionalized microparticles in suspension were stable for three consecutive weeks, stored in PBS at room temperature. In vitro experiments were carried out which showed, Con A bio-functionalized Batch 2 microparticles adhered to the membrane of the Dictyostelium discoideum (Dicty) whereas, WGA bio-functionalized microparticles did not adhere to the cell membrane of Dicty or HeLa cells. Therefore, a synthetic lectin called Boronic Acids (BAs) was used and an optimized protocol for functionalization of polysilicon microparticles with 4-formylphenylboronic acid (PBA), through stable secondary amine bonds was developed. Interaction of BA functionalized surfaces with carbohydrate, N-acetylglucosamine (GlcNAc) was also studied on surfaces using ARS, which indicates stronger interaction between BA and GlcNAc. Polysilicon microparticles of different sizes functionalized using BA showed adhesion to the cell membranes of Dicty and HeLa cells. In the second objective, the primary goal is to sense intracellular pH in living cells using bi-functional microparticles (polysilicon-gold), in order to differentiate between cancer cells and normal cells. The immobilization of pH dependent fluorophores, Oregon green, pHrodo, SNARF and Alexa fluor on to polysilicon surfaces was achieved successfully. An optimized protocol for the bi-functionalization of two pH dependent fluorophores, Oregon green (on polysilicon) and pHrodo (on gold) on to a hexahedral bi-functional microparticle was achieved for pH sensing. The third objective was the generation and sensing of Reactive oxygen species (ROS) using a bio-photosensitizer for photodynamic therapy. The selected bio-photosensitizer, Cytochrome c (Cyt c) showed generation of ROS in solution. BODIPY was able to sense the production of ROS from the Cyt c in solution. An optimized protocol for immobilizing Cyt c on to the polysilicon surfaces and BODIPY on gold surfaces and microparticles was achieved. Protocol for bi-functionalization of ROS generator: Cyt c and ROS sensor: BODIPY on bi-functional microparticles was also developed for ROS sensing. The fourth objective is to deliver anionic drugs using gold nanoparticles synthesized using imidazolium based macrocycles. The ability of these gold nanoparticles to extract and incorporate ibuprofenate from an aqueous phase was calculated to be ca 85 %. The release of ibuprofenate from the gold nanoparticles system follows Fickian diffusion, which could be potentially used for local drug delivery applications
Nous precursors de 2-vinilbenzimidazoles : betaïnes heterocícliques de benzimidazolat etilenimidazoli by Maria Gisbert Vidal( )

1 edition published in 1992 in Catalan and held by 1 WorldCat member library worldwide

 
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Alternative Names
Pérez García, M. Lluïsa

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