Cátia S. Nunes
Universidade Estadual de Maringá
Self-healing hydrogelsSupercritical fluidNuclear chemistryAdsorptionPolyelectrolyteIonic liquidNanoparticleCatalysisFactorial experimentOrganic chemistryAqueous solutionChemistryMaterials scienceSwellingChondroitin sulfateChitosanDrug deliveryEthanolPectinDifferential scanning calorimetryChemical engineeringDepolymerizationYield (chemistry)Zeta potentialBiology
21Publications
6H-index
175Citations
Publications 20
Newest
#2Cátia S. NunesH-Index: 6
Last. André R. Fajardo (UFPEL: Universidade Federal de Pelotas)H-Index: 29
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Abstract Hydrogels based on biopolymers like Gum Arabic (GA) usually show low applicability due to weak mechanical properties. To overcome this issue, (nano)fillers are utilized as reinforcing agents. Here, GA hydrogels were reinforced by chitin nanowhiskers (CtNWs, aspect ratio of 14) isolated from the biopolymer chitin through acid hydrolysis. Firstly, GA was chemically modified with glycidyl methacrylate (GMA), which allowed its crosslinking by free radical reactions. Next, hydrogel samples c...
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#1Paulo R. Souza (UFRGS: Universidade Federal do Rio Grande do Sul)H-Index: 9
#1Paulo R. R. De Souza (UEM: Universidade Estadual de Maringá)H-Index: 3
Last. Edvani C. Muniz (Federal University of Piauí)H-Index: 59
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Abstract We present chitosan (CHT)/heparin (HP) polyelectrolyte complexes (PECs) that quickly adsorb citrate-capped silver nanoparticles (AgNPs). CHT/HP blends in ionic liquid ([HMIm][HSO4]) form durable PECs after precipitation in water. CHT/HP PECs have positive Zeta potentials (higher than +20 mV). They adsorb citrate-capped AgNPs (Zeta potential of - 12.25 mV) synthesized from Turkevich's method. PEC/AgNPs composites are characterized by spectroscopic, thermal, and microscopy analyses. AgNPs...
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#1Letícia C. Bonkovoski (UEM: Universidade Estadual de Maringá)H-Index: 2
#2Bruno H. Vilsinski (UC: University of Coimbra)H-Index: 2
Last. Edvani C. Muniz (UEM: Universidade Estadual de Maringá)H-Index: 59
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Abstract Important researches aim for the development of efficient and cheaper biomedical devices based on natural polysaccharides. In this facet, polyelectrolytes complexes (PECs) are interesting materials for biomedical purposes because they can be prepared without using conventional and volatile organic solvents and toxic crosslinkers, commonly used in the synthesis of chemical hydrogels. For the first time, we used ionic liquids (1-alkyl-3-methylimidazolium tetrafluoroborate ionic liquids, [...
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#1Bárbara S. Caldas (UEM: Universidade Estadual de Maringá)H-Index: 2
#2Cátia S. Nunes (UEM: Universidade Estadual de Maringá)H-Index: 6
Last. Edvani C. Muniz (UEM: Universidade Estadual de Maringá)H-Index: 59
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Abstract Chitosan/chondroitin sulfate (CHT/CS) curcumin-charged hydrogels were prepared through polyelectrolytic complexation (PEC) following two methodologies (PEC-CUR and PEC-T-CUR) and were applied on apoptosis of HeLa cancer cells. PEC-T-CUR (ionic liquid (IL) mixed using ultraturrax homogenizer) results show to be far better than for PEC-CUR (IL mixed using magnetic stirring), with IC50 being improved 5.13 times to HeLa cancer cells (from 1675.2 to 326.7 μg mL−1). PECs produced by this meth...
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#1Paulo R. SouzaH-Index: 9
#2Bruno H. Vilsinski (UC: University of Coimbra)H-Index: 8
Last. Edvani C. Muniz (UTFPR: Federal University of Technology - Paraná)H-Index: 59
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Abstract Strategies for incorporating water-insoluble photosensitisers (PS) in drug delivery systems have been extensively studied. In this work, we evaluate the formation, characterisation, drug sorption studies, and cytotoxicity of chitosan (CHT)/chondroitin sulphate (CS) polyelectrolyte complexes (PECs) coated with polystyrene-block-poly(acrylic acid) (PS-b-PAA) nanoparticles (NPs) loaded with chloroaluminum phthalocyanine (AlClPc). The PECs were characterised by infrared spectroscopy (FTIR),...
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#1Caroline Apoloni Cionek (University of Minho)
#2Cátia S. Nunes (UTFPR: Federal University of Technology - Paraná)H-Index: 2
Last. Teresa Amorim (University of Minho)H-Index: 5
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The disinfection of swimming pool water is vital to maintain water quality. The chemicals used in this practice can damage the fabrics of bathing suits and shorten the shelf life of the textile sub...
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#1Bruno R. Machado (UTFPR: Federal University of Technology - Paraná)H-Index: 2
#2Suelen P. Facchi (UTFPR: Federal University of Technology - Paraná)H-Index: 7
Last. Alessandro F. Martins (UTFPR: Federal University of Technology - Paraná)H-Index: 26
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Pectin and chitosan films containing glycerol (Gly) at 5, 10, 15, 20, 30, and 40 wt % were prepared in an aqueous HCl solution (0.10 M) by the solvent evaporation method. The unwashed film (UF) containing 40 wt % Gly (UF40) had elongation at break (e, %) of 19%. Washed films (WFs) had high tensile strength (σ > 46 MPa) and low elongation at break (e, <5.0%), enabling their use in food packaging applications. The polymers’ self-assembling occurred during the washing, increasing the stiffness. The...
3 CitationsSource
#2Débora P. FacchiH-Index: 4
Last. Alessandro F. Martins (CSU: Colorado State University)H-Index: 26
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Abstract To obtain pectin-based films is challenging due to the aqueous instability of polyelectrolyte mixtures. We overcome this issue by blending chitosan to pectin of high O-methoxylation degree (56%), followed by solvent evaporation. A durable film containing 74 wt% pectin content was produced and used as an adsorbent material toward Cu(II) ions. Kinetic and adsorption equilibrium studies showed that the pseudo-second-order and Sips isotherm models adjusted well to the experimental data, res...
8 CitationsSource
#1Paulo Roberto Belomo de Souza (UEM: Universidade Estadual de Maringá)H-Index: 1
#1Paulo R. Souza (UEM: Universidade Estadual de Maringá)H-Index: 9
Last. Edvani C. Muniz (UEM: Universidade Estadual de Maringá)H-Index: 59
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Abstract Recycling of post-consumed composites based on thermosets reinforced with glass fibre (GF) uses different methods such as mechanical processing, high voltage fragmentation, thermal, and chemical treatments. Chemical treatments are a more interesting methodology because they allow the recovery of cleaner and polymeric matrices free glass fibres. However, depending on the solvent employed, limitations in chemical treatments such as a decrease in mechanical properties and low rate GF recov...
3 CitationsSource
#1Bruno H. VilsinskiH-Index: 8
#2Maria A. WittH-Index: 4
Last. Wilker CaetanoH-Index: 24
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Abstract Chloroaluminum phthalocyanine (ClAlPc) is considered to be an important photosensitizer compound, and it has been extensively explored in photodynamic therapy (PDT) against several types of cancer cell lines. However, ClAlPc is known to be a highly hydrophobic compound. Thus, it requires physical association with a drug delivery system for clinical use. In this study, distinct formulations of PS70.5-b-PAA13 diblock copolymer nanostructures containing ClAlPc were studied. Results found i...
5 CitationsSource