Browsing by Author "Mendes, Susana"
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- Application of microalgae as natural colorant for pastry and confectionary productsPublication . Pereira, Tatiana; Barroso, Sonia; Pinto, Filipa R.; Silva, Frederica; Teixeira, Paula; Mendes, Susana; Gil, Maria M.Modern consumers demand the replacement of synthetic colorants with natural alternatives. Microalgae can serve as an alternative source for these colorants since they hold significant amounts of pigments. This study aimed to evaluate the potential of using microalgae biomass and extracts as natural colorants for pastry and confectionary products. The application of different biomass and levels of Chlorella vulgaris (White, Honey, and a mixture of both) was evaluated in brioche-type breads as egg substitute to confer the typical yellow coloration to the product. A mixture of 1% Chlorella vulgaris (White: Honey [1:1]) showed potential as egg substitute, having minimal impact on the physical–chemical, microbiological, nutritional, and sensory characteristics of the products. Hydroalcoholic Tetraselmis chuii extracts were applied in fondant at a concentration of 0.05%, providing a green coloration with minimal impact on the quality of the product. This study supported the potential of using microalgae, biomass, and extracts, as alternative natural colorants in pastry and confectionary products.
- Chromatic essay for characterization of losses for the chromatic reintegration process of cultural heritagePublication . Bailão, Ana; Henriques, Frederico; Mendes, Susana; Gonçalves, AlexandreThe study presented here was conducted in the framework of the doctoral program in Cultural Heritage, specialization in Painting, which took place at the Catholic University of Portugal, with the theme of quality in chromatic reintegration. The aim of this study is to propose a system for the characterization of the losses in the pictorial surface, so that conservator-restorer can have access to qualitative and quantitative accurate information before, during and after the intervention. We used photographic images of a panel painting from the (XVI century and a geographical information system software, used in the processing of spatial data, the QGIS open source program. Keyword: characterization, losses, chromatic reintegration, GIS, QGIS.
- Development and optimization of high-protein and low-saturated fat bread formulations enriched with lupin and microalgaePublication . Pereira, Tatiana; Costa, Sandrina; Barroso, Sónia; Teixeira, Paula; Mendes, Susana; Gil, Maria M.Increased consumer awareness of healthier foods is driving the growth in the functional bread market. In view of this potential, three bread formulations were developed using various types of flour enriched with microalgae. The multigrain breads were composed of lupin and rye (F–R), lupin and spelt (F–S), and lupin, oats, and carob (F-OC) enriched with a mixture of Chlorella vulgaris (C. vulgaris White and C. vulgaris Smooth (4:1)). All breads were high in protein and low in saturated fat. Response surface methodology (RSM) following a central composite design (CCD) was used to evaluate the effect of selected technological parameters, namely water content (64.6–94.6% (w/w of flours)) and microalgae concentration (1.9–3.9% (w/w of flours)) on color, aroma, taste, texture, and overall sensory acceptance of the products. Only water content was found to affect the bread's sensory scores, especially texture, with higher water content increasing bread acceptance. This study allowed the development and optimization of three novel multigrain bread formulations enriched with microalgae that met the requirements of “rich in proteins” and “low in saturated fats” claims.
- Estudo para a caracterização espacial e bidimensional das lacunas no processo de reintegração cromática da pintura “A Circuncisão do Menino Jesus”Publication . Bailão, Ana; Henriques, Frederico; Mendes, Susana; Gonçalves, AlexandreThe study presented here was conducted in the framework of the doctoral program in Cultural Heritage, specialization in easel paintings, which took place at the Catholic University of Portugal, upon the theme of quality in chromatic reintegration. The aim of this study is to propose a system for the characterization of the losses in the pictorial surface, so that conservator-restorer can have access to qualitative and quantitative accurate information before, during and after the intervention. We used photographic images of a panel painting from the XVI century and a geographical information system (GIS) software used for processing spatial data, the QGIS open source program. The project has the particularity of being done in real time, during the intervention, in order to support the decision-making process.
- Use of Chlorella vulgaris lipidic extracts in the development of healthier pastry products with reduced fat contentsPublication . Pereira, Tatiana; Barroso, Sónia; Teixeira, Paula; Domingues, M. Rosário; Maurício, Tatiana; Mendes, Susana; Pinto, Filipa R.; Freire, Catarina D.; Matos, Gabriela; Saraiva, Jorge A.; Gil, Maria M.Pastry products constitute a significant segment of the food market. However, the high amount of fat used in their production poses a challenge when competing for the attention of modern consumers, who are more conscious of the health problems associated with the consumption of high-fat products. With this in mind, the main objective of this study is the reduction of the total fat and saturated fat contents of two bakery products, brioche-type bread and rice cake, by partial substitution of the main fat source with Chlorella vulgaris lipid extracts obtained through non-thermal high-pressure extraction (HPE). A reduction of 3% in the fat content of the brioche and a reduction of 11.4% in the total fat content of the rice cake were observed when the microalgae extracts were used to replace 10% of the margarine used in the brioche and 20% of the sunflower oil used in the rice cake. This substitution resulted in fat-reduced bakery products with similar physicochemical and nutritional properties to the full-fat controls. A triangle test demonstrated that no differences were perceived for the fat-reduced brioche, while in the rice cake, only slightly perceptible differences were detected. Moreover, brioche and rice cake containing the extract presented values of 1.22 ± 0.27 and 1.29 ± 0.39 mg GAE/g of total phenolic compounds, respectively. DPPH and FRAP activities were also quantified in 0.95 ± 0.38 and 1.83 ± 0.27 µmol AAE/g for brioche with extract and 1.10 ± 0.61 and 1.39 ± 0.39 µmol AAE/g for the rice cake with extract, respectively. The products were microbially stable for at least four days at room temperature. This study demonstrates the potential of using HPE microalgal lipid extracts as fat substitutes in bakery products.