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Thermo‐Responsive Microemulsions Containing Deep Eutectic‐Based Antibiotic Form...

Pedro, Sónia N.; Gomes, Ana T. P. C.; Vilela, Carla; Vitorino, Carla; Fernandes, Rosa; Almeida, Adelaide; Amaral, Maria Helena; Freire, Mara G.

The rise of antibiotic resistant strains, as methicillin-resistant Staphylococcus aureus (MRSA), challenges the current treatment of infections. In the case of ocular infections, antibiotic eye drops are commonly prescribed. However, their efficacy is usually compromised by the low viscosity of these formulations and the eye drainage. To overcome these drawbacks, deep eutectic solvent (DES)-based microemulsions...


Deep Eutectic Solvents as alternative solvents in Antimicrobial Photodynamic Th...

Vieira, Cátia; Bartolomeu, Maria; Pedro, Sónia N.; Gomes, Ana T. P. C.; Dias, Cristina J.; Gamelas, Sara R. D.; Lourenço, Leandro M. O.


Thermo-responsive microemulsions containing deep eutectic-based antibiotic form...

Pedro, Sónia N.; Gomes, Ana T. P. C.; Vilela, Carla; Vitorino, Carla; Fernandes, Rosa; Almeida, Adelaide; Amaral, Maria Helena; Freire, Mara G.

The rise of antibiotic resistant strains, as methicillin-resistant Staphylococcus aureus (MRSA), challenges the current treatment of infections. In the case of ocular infections, antibiotic eye drops are commonly prescribed. However, their efficacy is usually compromised by the low viscosity of these formulations and the eye drainage. To overcome these drawbacks, deep eutectic solvent (DES)-based microemulsions...


Investigation of the potential of deep eutectic solvents (DES) as alternative s...

Vieira, Cátia; Bartolomeu, Maria; Pedro, Sónia N.; Gomes, Ana T. P. C.; Dias, Cristina J.; Gamelas, Sara R. D.; Lourenço, Leandro M. O.

Antimicrobial Photodynamic Therapy (aPDT) is gaining recognition as an effective approach for the photoinactivation of a broad spectrum of microorganisms [1,2]. Due to their apolar behavior, photosensitizers (PS) often have low solubility in aqueous media requiring the use of toxic organic solvents that are incompatible with their application in the field [4]. In this study, the potential of Deep Eutectic Solve...


Integrated approach to extract and purify proteins from honey by ionic liquid-b...

Pereira, Matheus M.; Pedro, Sónia N.; Quental, Maria V.; Mohamadou, Aminou; Coutinho, João A. P.; Freire, Mara G.

The purification of value-added compounds by three phase partitioning (TPP) is a promising alternative to conventional processes since the target compound can be easily recovered from the liquid-liquid interphase. Although this technique has been successfully applied to the recovery of proteins, the minimization of the use of salts and solvents must be pursued to improve the overall process sustainability. Acco...


Deep Eutectic Solvent Formulations and Alginate-Based Hydrogels as a New Partne...

Pedro, Sónia N.; Mendes, Maria S. M.; Neves, Bruno M.; Almeida, Isabel Filipa; Costa, Paulo; Correia-Sá, Inês; Vilela, Carla; Freire, Mara G.

The transdermal administration of nonsteroidal anti-inflammatory drugs (NSAIDs) is a valuable and safer alternative to their oral intake. However, most of these drugs display low water solubility, which makes their incorporation into hydrophilic biopolymeric drug-delivery systems difficult. To overcome this drawback, aqueous solutions of bio-based deep eutectic solvents (DES) were investigated to enhance the so...


Boosting antibiotics performance by new formulations with deep eutectic solvents

Pedro, Sónia N.; Gomes, Ana T. P. C.; Oskoei, Párástu; Oliveira, Helena; Almeida, Adelaide; Freire, Mara G.; Silvestre, Armando J. D.

The critical scenario of antimicrobial resistance to antibiotics highlights the need for improved therapeutics and/or formulations. Herein, we demonstrate that deep eutectic solvents (DES) formulations are very promising to remarkably improve the solubility, stability and therapeutic efficacy of antibiotics, such as ciprofloxacin. DES aqueous solutions enhance the solubility of ciprofloxacin up to 430-fold whil...


Ionic liquids in drug delivery

Pedro, Sónia N.; Freire, Carmen S. R.; Silvestre, Armando J. D.; Freire, Mara G.

Ionic liquids (ILs) are molten salts composed of a large organic cation and an organic/inorganic anion. Due to their ionic character, most ILs present advantageous properties over conventional solvents, such as negligible volatility at atmospheric conditions and high thermal and chemical stabilities. The wide variety of IL anion–cation combinations allows these solvents to be designed to display a strong solvat...


The role of ionic liquids in the pharmaceutical field: an overview of relevant ...

Pedro, Sónia N.; Freire, Carmen S. R.; Silvestre, Armando J. D.; Freire, Mara G.

Solubility, bioavailability, permeation, polymorphism, and stability concerns associated to solid-state pharmaceuticals demand for effective solutions. To overcome some of these drawbacks, ionic liquids (ILs) have been investigated as solvents, reagents, and anti-solvents in the synthesis and crystallization of active pharmaceutical ingredients (APIs), as solvents, co-solvents and emulsifiers in drug formulatio...


Synthesis and characterization of analogues of glycine-betaine ionic liquids an...

Pereira, Matheus M.; Pedro, Sónia N.; Gomes, Joana; Sintra, Tânia E.; Ventura, Sónia P. M.; Coutinho, João A. P.; Freire, Mara G.; Mohamadou, Aminou

A series of novel analogues of glycine-betaine ionic liquids (AGB-ILs), viz. 1-(4-ethoxy-4-oxobutyl)-1-methylpyrrolidin-1-ium, N,N,N-tri(n-butyl)(4-ethoxy-4-oxobutyl)-1-phosphonium and N,N,N-trialkyl(4-ethoxy-4-oxobutyl)-1-aminium cations with ethyl, n-propyl and n-butyl alkyl chains, combined with the bromide anion, have been synthesized and characterized. Their synthesis and characterization by spectroscopic ...


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