Browsing by Author "Lopes, Ana Isabel"
Now showing 1 - 10 of 12
Results Per Page
Sort Options
- Antimicrobial activity of alginate films and coatings: a comparisonPublication . Lopes, Ana Isabel; Melo, Adma; Pereira, Eliana; Caleja, Cristina; Barros, Lillian; Tavaria, Freni; Pintado, Manuela
- Antimicrobial activity of an edible film incorporated with oregano essential oilPublication . Lopes, Ana Isabel; Melo, Adma; Pereira, Eliana; Caleja, Cristina; Barros, Lillian; Tavaria, Freni; Pintado, Manuela
- Antimicrobial activity of an edible film incorporated with oregano essential oilPublication . Lopes, Ana Isabel; Melo, Adma; Pereira, Eliana; Caleja, Cristina; Barros, Lillian; Tavaria, Freni; Pintado, Manuela
- Antimicrobial characterization of alginate edible films containing plant extractsPublication . Lopes, Ana Isabel; Tavaria, Freni; Pintado, Manuela
- Antioxidant activity of alginate edible films containing plant extractsPublication . Lopes, Ana Isabel; Silva, Sara; Barros, Lillian; Caleja, Cristina; Pereira, Eliana; Tavaria, Freni K.; Pintado, ManuelaNowadays, food packaging has been the target of increasing attention. Traditional food packaging is usually made of plastic and accounts for 36.9% of the plastics’ demand, being considered the largest market for plastic industry. Additionally, plastics are mostly produced with polymers from non-renewable sources and so, they contribute to environmental pollution. A way to circumvent this problem is the development of edible films. Edible films can act as complements to traditional plastics because their functional properties are able to extend food’s shelf-life1.Plant extracts are obtained by plants and possess antioxidant activity because of their high concentrations of phenolic compounds. They can be effective at low concentrations, are cost-effective and easy to apply, presenting low toxicity levels and high stability during processing and may not affect the sensory characteristics of food products2.The addition of plant extracts to edible films confers them the ability to act as food preservatives because they present antimicrobial activity against a broad spectrum of food poisoning microorganisms and antioxidant properties that helps to avoid the deterioration of fats and other food constituents 3. So, the main objective of this work was to evaluate the antioxidant activity of alginate edible films containing extracts of licorice (Glycyrrhiza glabra L.), eucalyptus (Eucalyptus globulus Labill.) and sage (Salvia officinalis L.). The 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) and 2,2-difenil-1-picrilhidrazil (DPPH) scavenging tests were performed on the films and the results show that the films incorporated with plant extracts present antioxidant activity when compared to the control (alginate film without plant extract).The film incorporated with sage extract was the one that presented the best antioxidant activity by both ABTS (4024,169 Trolox equivalents (M)/mg film) and DPPH (3954,813 Trolox equivalents (M)/mg film), followed by the film with eucalyptus extract (ABTS: 3706,291 Trolox equivalents (M)/mg film; DPPH: 3706,291 Trolox equivalents (M)/mg film). On the other hand, the film incorporated with licorice extract (ABTS: 942,5195 Trolox equivalents (M)/mg film; DPPH: 1040,669 Trolox equivalents (M)/mg film) was the one with least antioxidant activity.
- Antioxidant activity of alginate edible films containing plant extractsPublication . Lopes, Ana Isabel; Silva, Sara; Barros, Lillian; Caleja, Cristina; Pereira, Eliana; Tavaria, Freni; Pintado, ManuelaNowadays, food packaging has been the target of increasing attention. Traditional food packaging is usually made of plastic and accounts for 36.9% of the plastics’ demand, being considered the largest market for plastic industry. Additionally, plastics are mostly produced with polymers from non-renewable sources and so, they contribute to environmental pollution. A way to circumvent this problem is the development of edible films. Edible films can act as complements to traditional plastics because their functional properties are able to extend food’s shelf-life1. Plant extracts are obtained by plants and possess antioxidant activity because of their high concentrations of phenolic compounds. They can be effective at low concentrations, are cost-effective and easy to apply, presenting low toxicity levels and high stability during processing and may not affect the sensory characteristics of food products2. The addition of plant extracts to edible films confers them the ability to act as food preservatives because they present antimicrobial activity against a broad spectrum of food poisoning microorganisms and antioxidant properties that helps to avoid the deterioration of fats and other food constituents 3. So, the main objective of this work was to evaluate the antioxidant activity of alginate edible films containing extracts of licorice (Glycyrrhiza glabra L.), eucalyptus (Eucalyptus globulus Labill.) and sage (Salvia officinalis L.). The 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) and 2,2-difenil-1-picrilhidrazil (DPPH) scavenging tests were performed on the films and the results show that the films incorporated with plant extracts present antioxidant activity when compared to the control (alginate film without plant extract). The film incorporated with sage extract was the one that presented the best antioxidant activity by both ABTS (4024,169 Trolox equivalents (M)/mg film) and DPPH (3954,813 Trolox equivalents (M)/mg film), followed by the film with eucalyptus extract (ABTS: 3706,291 Trolox equivalents (M)/mg film; DPPH: 3706,291 Trolox equivalents (M)/mg film). On the other hand, the film incorporated with licorice extract (ABTS: 942,5195 Trolox equivalents (M)/mg film; DPPH: 1040,669 Trolox equivalents (M)/mg film) was the one with least antioxidant activity.
- Doença inflamatória intestinal: como funciona o tratamento nutricional?Publication . Carvalho, Rita Vieira de; Lopes, Ana IsabelIntrodução: A doença inflamatória intestinal (DII) é uma patologia inflamatória crónica do trato gastrointestinal, causada por uma resposta imune desregulada contra o microbioma intestinal comensal. Os objetivos da terapêutica são alcançar e manter a remissão da doença, prevenindo a sua progressão. A terapia nutricional está associada a alteração da microflora intestinal, aperfeiçoamento da função de barreira mucosa e efeito anti-inflamatório direto. Objetivo: Compreender o funcionamento e eficácia do tratamento nutricional na evolução da doença inflamatória intestinal. Revisão dos dados relativos a tratamento nutricional em idade pediátrica. Materiais e Métodos: Foi realizada uma revisão bibliográfica sobre o tema nas revistas científicas disponíveis online, reunindo e comparando os diferentes dados encontrados nas fontes de consulta. Resultados: Na indução da remissão da doença de Crohn ativa, a nutrição entérica exclusiva é tão efetiva como a corticoterapia. Na manutenção da remissão, os dados são escassos, mas a terapia nutricional parece diminuir o risco de recaídas. Conclusão: A nutrição entérica exclusiva é atualmente primeira linha para indução da remissão da doença de Crohn ativa e evidencia redução do risco de recaídas na manutenção da remissão em crianças com DII.
- Elaboration and antimicrobial activity of films from plant residues incorporated with eucalyptus extract and oregano essential oilPublication . Melo, Adma; Lopes, Ana Isabel; Pereira, Eliana; Caleja, Cristina; Barros, Lillian; Tavaria, Freni; Pintado, Manuela
- Elaboration and antimicrobial activity of films from plant residues incorporated with eucalyptus extract and oregano essential oilPublication . Melo, Adma; Lopes, Ana Isabel; Pereira, Eliana; Caleja, Cristina; Barros, Lillian; Tavaria, Freni; Pintado, Manuela
- Elaboration of films from plant residues: a more sustainable alternative to the environmentPublication . Melo, Adma; Lopes, Ana Isabel; Ribeiro, Tânia; Pereira, Eliana; Caleja, Cristina; Barros, Lillian; Tavaria, Freni; Pintado, Manuela