Laura Martins Fonseca

Universidade Federal de Pelotas | UFPEL · Department of Agroindustrial Science & Technology

Polymer concentration and aging time of polymeric solutions are crucial factors that can influence their viscosity, playing an essential role in the fabrication of electrospun nanofibers. Based on this, herein we evaluated the impact of aging time (24 and 48 h) and pea starch concentration (10%, 20%, and 30%, wt/vol) on the polymeric solutions to p...

Starch aerogels are a clean‐label alternative to produced active packaging aimed at preserving food products. This study aims to produce water‐absorbent and reusable aerogels from different starches and investigates their properties according to the type of starch. The aerogels are produced using different starch concentrations and evaluated in ter...

Geranium (Pelargonium graveolens) is known for being an aromatic plant rich in bioactive compounds with antibacterial properties. In this study, geranium essential oil (GEO) was extracted and encapsulated in ultrafine bean starch fibers produced by electrospinning as an antibacterial agent. GEO revealed a composition rich in volatile compounds, inc...

Onion is rich in bioactive and volatile compounds with antioxidant activity. However, the pungent odor of volatile compounds (VOCs) released restricts its use. The encapsulation of red onion extract by electrospinning is an alternative to mask this odor and protect its bioactive compounds. The main objective of this study was to encapsulate red oni...

É com grande satisfação que apresentamos o livro “Pesquisas e Avanços em Microbiologia de Alimentos”. Este livro representa um marco importante na divulgação do conhecimento gerado durante a III Semana Nacional da Microbiologia de Alimentos na Indústria, um evento que reuniu especialistas, pesquisadores e acadêmicos da área de microbiologia de alim...

Propolis has beneficial health properties attributed to of phenolic compounds. However, its application is limited. Thus, encapsulation protects the bioactive compounds of propolis from degradation, allowing their release under controlled and specific conditions and increasing their solubility. In addition to protecting flavonoids, encapsulation al...

This study aimed to produce water-absorbent bioactive aerogels using biodegradable raw materials, wheat starch and poly ethylene oxide (PEO), and derived from agro-industrial residues (grape skin) obtained in the wine industry. The aerogels were produced using germinated wheat starch (GWS), with and without PEO, and incorporating grape skin extract...

This study aimed to produce oleogels based on non-germinated and germinated wheat starches with orange essential oil, apply them to replace hydrogenated vegetable fat in bread, and assess the antifungal action. The oleogels were prepared using sunflower oil, wheat starches, beeswax, water, and orange essential oil (OEO). They were evaluated to dete...

Onions are rich in bioactive and volatile compounds with antioxidant activity. When concentrated in plant extracts and applied directly into food matrices or packaging, they are sensitive to external factors and may have undesirable sensory attributes, such as odors. Therefore, this study sought to encapsulate red onion extract (ROE) in different c...

The aim of this work was to encapsulate curcumin at different concentrations in capsules and fibers of native potato starch by electrospraying and electrospinning. The best conditions for the production of capsules and fibers were obtained by varying the polymer concentration and resting time of the polymer solution. The best conditions were used f...

Electrospinning encapsulation is a highly viable method to protect bioactive compounds and prevent their degradation. Hence, this study produced ultrafine fibers based on yellow and white sweet potato starches and a red onion skin extract (ROSE; 0, 3, 6, and 9%, w/w) using electrospinning. The fibers were evaluated for morphology, thermogravimetric...

Este livro reúne os trabalhos aprovados no II Congresso Brasileiro Online de Ciência dos Alimentos, organizado pela Agron Food Academy. Os trabalhos estão organizados nas modalidades de pesquisa e revisão de literatura distribuídos conforme os eixos temáticos do evento, que incluíram as áreas: Biotecnologia de Alimentos; Controle de Qualidade de Al...

Este livro reúne os trabalhos aprovados no II Congresso Brasileiro de Produção Animal e Vegetal, organizado pela Agron Food Academy. Os trabalhos estão organizados nas modalidades de pesquisa e revisão de literatura distribuídos conforme os eixos temáticos do evento, que incluíram as áreas: Adubação, nutrição de plantas e manejo de irrigação, Fisio...

Este livro reúne os trabalhos aprovados no II Congresso Brasileiro de Produção Animal e Vegetal, organizado pela Agron Food Academy. Os trabalhos estão organizados nas modalidades de pesquisa e revisão de literatura distribuídos conforme os eixos temáticos do evento, que incluíram as áreas: Adubação, nutrição de plantas e manejo de irrigação, Fisio...

The aims of this study were to examine the phosphorylation of sorghum flour at different reaction times, evaluate the properties of modified flour, and apply the phosphorylated sorghum flour at different concentrations in the production of gluten-free cakes. The phosphorylated sorghum flour showed reduction in the following parameters: amylose cont...

Heat-moisture treatment (HMT) and annealing are hydrothermal starch modifications. HMT is performed using high temperature and low moisture content range, whereas annealing uses excess of water, a long period of time, and temperature above the glass transition and below the gelatinization temperature. This review focuses on: research advances; the...

Phenolic compounds are prone to degradation from external deleterious conditions. Thus, a carrier for its delivery can be useful in protecting them and ensuring their optimal release profile. The objective of this study was to produce starch nanofibers as delivery carriers for carvacrol and to evaluate its in-vitro digestion simulation and anti-gli...

This study aimed to produce soluble potato starch ultrafine fibers for the encapsulation of pinhão coat extract (PCE), evaluating their relative crystallinity (RC), thermal stability, antioxidant activity, antimicrobial activity against Escherichia coli and Staphylococcus aureus, as well as in vitro biological digestion. In the simulation of in vit...

The objective of this study was to produce renewable aerogels from native and anionic corn starches loaded with pinhão coat extract (PCE) with water absorbent capacity, antioxidant activity and controlled release of phenolic compounds in a hydrophilic food simulant media. Starch aerogels were produced with different concentrations of PCE, 5 and 10%...

The need for biodegradable and innovative nanomaterials in the food packaging industry motivates the conduction of studies on the production and characterization of new nanomaterials. The aim of this study was to evaluate the encapsulation efficiency (EE), thermal resistance, and antioxidant and antimicrobial activities of carvacrol encapsulated in...

The objective of this study was to produce an antioxidant and hydrophobic membrane formed by ultrafine fibers using poly (lactic acid) (PLA) 8% and different concentrations of lignin from rice husk [(0.5%, 1.5% or 2.5% (w v−1)] dissolved in chloroform/acetone (3:1) solvent, by electrospinning technique. The ultrafine fibers were characterized by mo...

The objective of this study was to evaluate the in vitro susceptibility of fungi to starch/carvacrol nanofibers produced by electrospinning. The nanofibers were incorporated into bread dough or used in the development of active packages to minimize bread spoilage. In agar diffusion and micro-atmosphere assays, the nanofibers with 30 % or 40 % carva...

BACKGROUND The supplementation of folic acid in food is essential in the human diet. The present study aimed to encapsulate folic acid at different concentrations (5, 10 and 15% (w/w) on a dry basis) in potato starch nanofibers produced through electrospinning. The starch/folic acid nanofibers were evaluated through morphology, Fourier transform in...

Pinhão coat extract is rich in phenolic compounds. Thus, the present study aimed to encapsulate pinhão (Araucaria angustifolia) coat extract (PCE) in electrospun starch fibers, and evaluate its antioxidant activity and in vitro release. The PCE’ total and individual phenolic compounds were evaluated. Fiber-forming polymer solutions were prepared wi...

This study is focused on the production of zein-TiO2 nanofibers produced through electrospinning and the evaluation of such fibers as ethylene absorbers when used to improve the storage of cherry tomatoes. Zein (30 % (w/v)) were dissolved in 70 % (v/v) ethanol and incorporated with TiO2 (0 %–5 %). The polymer solutions were evaluated for their elec...

BACKGROUND Thyme essential oil (TEO) is an excellent natural substitute for synthetic compounds to maintain the quality and safety of food products. It acts as an antioxidant agent. We aimed to nanoencapsulate TEO at concentrations of 1%, 3%, and 5% (v/w, dry basis) in electrospun nanofibers made of starch (50% w/v) and formic acid (75% v/v). The r...

The objective of this study was the valorization of yerba-mate through isolation of cellulose and nanocellulose, aiming for elaboration of bioactive aerogels containing yerba-mate based extract (YMBE). Cellulose and nanocellulose isolated from yerba-mate were evaluated in functional groups, crystallinity, morphology, and thermal properties. The bio...

BACKGROUND Yerba mate extract was encapsulated in electrospun zein fibers. Solutions were prepared with 30% (w/v) zein, and yerba mate extract was added at concentrations of 1%, 3%, and 5% (w/w). The rheology and electrical conductivity of the polymer solutions were evaluated. The extract and the fibers were characterized through an analysis of tot...

This study aimed to produce aerogels with pinhão (Araucaria angustifolia) coat extract using native and anionic starches as carrier matrix and evaluate its effect on cell viability, in vitro cytotoxicity, and in vitro digestibility using C6 rat glioma cells. The aerogels were prepared by the gelatinization of starch and several freeze/thaw cycles....

The objective of this study was to generate and characterize physically cross-linked aerogels by using germinated and non-germinated wheat starch, with and without the addition of poly (ethylene oxide) (PEO). Aerogels were produced by gelatinization of starch (10% w/v, in distilled water) at 90 °C, followed by multiple freeze/thaw cycles. For the a...

The objective of this study was to immobilize α‐amylase in polyvinyl alcohol (PVA) electrospun fibers with subsequent chemical crosslinking using vapor phase glutaraldehyde. The PVA/α‐amylase electrospun fibers were subjected to different crosslinking exposure time treatments and evaluated through the functional groups (FT‐IR), thermal properties (...

In this study, ultrafine fibers were produced from black bean protein concentrates (BPCs) and polyvinyl alcohol (PVA) by electrospinning. The BPC was denatured under acidic (pH 2) or basic (pH 11) conditions. Polymer solutions containing different PVA concentrations (11% or 21%, w/v) and different BPC: PVA ratios (50:50 or 75:25, v/v) were used for...

There is a worldwide demand for environment‐friendly, biodegradable materials. The objective of this study was to develop biocomposite films using native or phosphorylated wheat starch reinforced with cellulose nanocrystals (CNCs) from three different sources, rice, oat, and eucalyptus husks. The films were evaluated by their morphology, thermal pr...

Amido de milho: Diferentes teores de amilose e seu potencial como matriz de embalagens

In this study, a method was developed to encapsulated carvacrol in nanofibers from soluble potato starch. The carvacrol was added in starch solutions at various concentrations (0, 20, 30 and 40% v/v) and electrospun into fibers. The morphology, size distribution, thermal stability, FT-IR spectra, relative crystallinity (RC) and antioxidant of the e...

The objective of this study was to immobilize α-amylase in ultrafine polyvinyl alcohol (PVA) fibers by electrolysis and to evaluate its stability at different temperatures and pHs using various starch substrates such as corn starch and germinated and ungerminated wheat starches. The α-amylase-loaded ultrafine fibers were characterized by scanning e...

Through starch phosphorylation and solution aging treatments, the aim of this work was to produce electrospun fibers derived from native and anionic (modified with sodium tripolyphosphate) corn starches with amylose contents of <70% (w/w). The fibers of native and anionic corn starches (regular amylose and high amylose Hylon V/Hylon VII) were prepa...

The need to replace conventional polymers due to environmental pollution caused by them has led to increased production of biodegradable polymers such as starch. Thus, the application possibilities of starch have increased. In this study, we produced and characterized biodegradable films derived from native and oxidized potato starch. The film-form...

The ultrafine fibers were produced using a polymeric blend of soy protein isolate (SPI), polyethylene oxide (PEO), and zein at a ratio of 1:1:1 (v/v/v) by electrospinning. The ginger essential oil (GEO) was encapsulated in the ultrafine fibers and the morphology, Fourier-Transform Infrared Spectroscopy (FTIR) analysis, thermal properties and relati...

The production of biodegradable films has been studied to be a substitute of conventional plastics. The use of starch in biodegradable films are of great interest and starch modification improves an increase to the mechanical properties the film. The mechanical properties were evaluated by Dynamic Mechanical Analysis (DMA). The aim of this study is...

The capacitive properties on aluminum alloy coated by sol-gel are evaluated in this work. The samples were anodized in a H2SO4 solution for three different times (15, 20 and 30 min) and subsequently covered by a sol-gel. The capacitance of the samples was evaluated by electrochemical impedance spectroscopy (EIS). Firstly the capacitance of the anod...

In this study, the inhibitor effect of Solidago chilensis extract as green corrosion inhibitor for anodized aluminum alloy samples was evaluated in NaCl 3%wt solution. This study was carried out for application on cans for pack of foods. The procedure of the surface treatment of the samples was done by anodizing followed by sealing in a solution co...

The objective of this study was to evaluate the effects of oxidation with sodium hypochlorite at different concentrations of active chlorine (0.5, 1.0 and 1.5 g/100 g) on the physicochemical, morphological, pasting, thermal and gel texture properties of potato starch. The native and oxidized starches were used in different concentrations (3.0, 4.0...