Idalina Gonçalves

Idalina Gonçalves
University of Aveiro | UA · Department of Materials and Ceramics Engineering

PhD in Chemical and Biological Engineering

About

62
Publications
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249
Citations

Publications

Publications (62)
Article
Bioplastics have emerged to minimize the ecological footprint of non-degradable plastics. However, the effect of their degradation in aquatic systems, including the interaction with toxic metals, is still unexplored. In this work, the influence of UV-aging on structure, chemistry, wettability, rigidity, and Hg-sorption of commercially available bio...
Article
Underexploited sources of bio-based wall materials for bioactive compounds (such as β-carotene) encapsulation have gained increasing interest within the scientific community. In this study, the potential of amaranth (Amaranthus cruentus) grain starch and protein rich fractions as microcapsules’ wall materials to carrier β-carotene was evaluated. Mi...
Article
Background: Non-value agrifood byproducts are rich in biomolecules such as proteins and polysaccharides, and possess film-forming ability, motivating their use in the development of biodegradable plastics. This work studied the feasibility of using locust bean milling-derived dust (LBMD) as a source of biomolecules suitable for developing biodegra...
Article
Full-text available
The concept behind photodynamic therapy (PDT) is being successfully applied in different biomedical contexts such as cancer diseases, inactivation of microorganisms and, more recently, to improve wound healing and tissue regeneration. The effectiveness of PDT in skin treatments is associated with the role of reactive oxygen species (ROS) produced b...
Article
Full-text available
Starch is a promising candidate for preparing biodegradable films with useful gas barriers and thermoplastic capabilities. However, these materials are hydrophilic and brittle, thus limiting their application range. To overcome these drawbacks, it has been hypothesized that starch can be hydrophobized and plasticized during the starch-based film pr...
Article
Full-text available
Dietary fiber can be obtained by dextrinization, which occurs while heating starch in the presence of acids. During dextrinization, depolymerization, transglycosylation, and repolymerization occur, leading to structural changes responsible for increasing resistance to starch enzymatic digestion. The conventional dextrinization time can be decreased...
Article
Starch, due to its thermoplastic capacity, is being explored for developing food packaging bioplastics. Nevertheless, it gives rise to brittle and hydrophilic materials. To overcome these drawbacks, in this work, the influence of potato peel phenolic extracts (PhE) on physicochemical and mechanical properties of starch-based films was studied. PhE...
Article
Full-text available
Microorganisms, usually bacteria and fungi, grow and spread in skin wounds, causing infections. These infections trigger the immune system and cause inflammation and tissue damage within the skin or wound, slowing down the healing process. The use of photodynamic therapy (PDT) to eradicate microorganisms has been regarded as a promising alternative...
Article
Full-text available
The coffee industry generates a wide variety of by-products derived from green coffee processing (pulp, mucilage, parchment, and husk) and roasting (silverskin and spent coffee grounds). All these fractions are simply discarded, despite their high potential value. Given their polysaccharide-rich composition, along with a significant number of other...
Article
Food processing wastes together with the perishable foodstuff loss promote environmental and societal concerns. Food byproducts can have value as a source of functional molecules for developing active packaging without food waste, under a circular economy. Nevertheless, the often-associated extraction/chemical processes compromise the sustainabilit...
Article
Full-text available
This review aims to showcase the current use of graphene derivatives, graphene-based nanomaterials in particular, in biopolymer-based composites for food packaging applications. A brief introduction regarding the valuable attributes of available and emergent bioplastic materials is made so that their contributions to the packaging field can be unde...
Article
The small amount of proteins in starch-rich food industry byproducts can be an advantage to crosslink with genipin and tailor the performance of biobased films. In this work, genipin was combined with non- purified starch recovered from industrial potato washing slurries and used for films production. Starch recovered from potato washing slurries c...
Article
Agrofood byproducts may be exploited as a source of biomolecules suitable for developing bioplastic materials. In this work, the feasibility of using starch, oil, and waxes recovered from potato chips byproducts for films production was studied. The recovered potato starch-rich fraction (RPS) contained an amylopectin/amylose ratio of 2.3, gelatiniz...
Article
Genipin crosslinking increases the acidic stability of chitosan-based materials, opening an opportunity to explore new applications. In this work, the viability of using chitosan-genipin solutions on cellulose-based materials coating was studied. Non-calendered paper and cardboard were used as raw materials. Different number of chitosan-genipin coa...
Poster
Full-text available
Biobased materials arise has potential solution to minimize the environmental impact caused by the disposal of synthetic polymers into landfills. Starch is an abundant thermoplastic biopolymer that allows the production of bioplastics with notable renewability and biodegradability. However, starch-based materials are hygroscopic and have poor mecha...
Article
Chitosan-genipin films present a bluish-green color due to the conjugated double bonds formed when monomeric or dimeric genipin residues bridge chitosan. This phenomenon limits their use when colorless materials are required. In this work, a two-step oxidation strategy was developed aiming to remove color from chitosan-genipin films while preservin...
Poster
Full-text available
The short shelf-life of fresh food leads to a large amount of agro-food wastes. On the other hand, comercial and industrial agrofood sectors produce a high amount of non-reused byproducts. Both of these wastes are often disposed in landfills, giving rise to envi-ronmental problems. Therefore, find a solution for both of these is-sues is a challenge...
Article
Poly(hydroxybenzene)-trimethoprim conjugates were prepared using methylparaben as substrate of the oxidative enzyme tyrosinase. MALDI-TOF MS analysis showed that the enzymatic oxidation of methylparaben alone leads to the poly(hydroxybenzene) formation. In the presence of trimethoprim, the methylparaben tyrosinase oxidation leads poly(hydroxybenzen...
Article
Full-text available
Laccases (EC 1.10.3.2) are copper-containing enzymes that oxidize a variety of phenolics and other aromatic compounds through a radical-catalyzed mechanism. The use of mediators acting as vehicles for electron transfer can expand the range of laccase substrates to other classes of chemical compounds. Ultrasound irradiation through a liquid medium g...
Article
Biofilm formation in urinary indwelling catheters is one of the most critical issues that patients face. Catheters were coated with poly(catechin)-antibiotic conjugates with enhanced antimicrobial properties. Catechin was conjugated with two antibiotics, namely trimethoprim (TMP) and sulfamethoxazole (SMZ) via activation with N,N'-disuccinimidyl ca...
Article
The potential of ultrasound-assisted technology has been demonstrated by several laboratory scale studies. However, their successful industrial scaling-up is still a challenge due to the limited pilot and commercial sonochemical reactors. In this work, a pilot reactor for laccase-hydrogen peroxide cotton bleaching assisted by ultrasound was scaled-...
Article
Urinary polyurethane (PU) and silicone (SI) catheters were coated with poly(catechin) to reduce bacterial adhesion. Laccase was used as a biocatalyst to oxidize the catechin monomer and produce the polymer. Optimization of the catheter surface functionalization followed two different approaches: with or without previous alkali treatment. The result...
Article
The main goal of this work is to develop a novel and environmental-friendly technology for cotton bleaching with reduced processing costs. This work exploits a combined laccase-hydrogen peroxide process assisted by ultrasound. For this purpose, specific reactors were studied, namely ultrasonic power generator type K8 (850kHz) and ultrasonic bath eq...
Article
Hydrogen peroxide was produced from bran by a two-step process using cellulase/xylanase and glucose oxidase, sequentially. The decolourization efficiency of the produced reagent was tested using paprika oil dye (effluent from industrial source) and high levels of colour removal (96%) were achieved after saponification pre-treatment and hydrogen per...

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Projects

Projects (2)
Project
PLASTICOLIGHT project aims to develop lightweight extenders for plastic formulations, using porous raw materials (eggshells) and physicochemical and morphological modification processes with polysaccharides and/or porous oxides. At the plastic industry, the use of fillers allows to improve the mechanical performance of the final material with concomitant reduction of the production cost. Calcium carbonate is one of the most fillers used due to its low cost, good stability and non-toxicity. Usually, this is applied until amongst 20 and 40% of the plastic formulation. However, its high density (2,73 g/cm3) compromises some applications in which the polymers need to be of lightweight, and the level of cost saving on polymer. Aiming overcome this drawback, this project suggests the use of calcium carbonate recovered from eggshells, which are residues discarded by the agrofood sector, highly porous and rich in calcium carbonate (94%). When recovered from this raw material, the calcium carbonate has a density value amongst 1.91 and 2.30 g/cm3, being, therefore, a low-density alternative to the currently used in industry. Besides, PLASTICOLIGHT also proposes the calcium carbonate density reduction through its modification with polysaccharides able to interact with calcium ions (pectate and alginate) and/ or with porous oxides. Each one of the developed materials will be properly characterized, compared with calcium carbonate particles on the market and evaluated in terms of their compatibility of being extrude and injected with polypropylene and polystyrene formulations. In a last stage, it will be performed extrusion and injection assays at pilot/semi-industrial scale and evaluated the lightweight plastic performance at possible end users.
Project
The environmental impact and high cost of recycling conventional plastics are the main motivation to search for new bioplastic materials. Herein, this project aims to develop a biodegradable bioplastic compound as a potential alternative to conventional plastics. As a petroleum substitute, it is intended to use a natural raw material – potato. Considering the great amount of potato processing industry byproducts available, their valorization through biodegradable bioplastics development is an opportunity.