Percorrer por autor "Jarboui, Amira"
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- Application of electrochemical sensors as an alternative tool for perfume evaluationPublication . Jarboui, Amira; Peres, António M.; Dias, L.G.; Mokkadem, YassinThe capability to discriminate perfumes based on their specific aroma profiles is of utmost relevance for the perfume industry considering that, the identification of more than three aromas is a very difficult task even for a trained human nose. Currently, no analytical tool can completely substitute the human nose for aroma evaluation. Also, no analytical system can fully mimic the human perception, being the recognition of perfume aroma patterns usually carried out by gas chromatography coupled with olfactometry or sniffing techniques or even by applying electronic noses, although it still is a difficult analytical task. In this work, the possibility of applying a potentiometric electronic tongue as an analytical sensors tool for perfume analysis, was evaluated for the first time. In fact, the perfume aroma pattern will depend on the composition of the liquid perfume phase and on the diffusion properties of the volatile components, making the proposed strategy feasible from a theoretical point of view. A multi-sensor potentiometric device, comprising a set of 40 lipid sensor membranes with cross-sensitivity, was applied together with chemometric techniques to identify and establish unique chemical perfume fragrances’ fingerprints for discriminating perfumes according to the target consumer (men – women perfumes), the perfume olfactory family (Citric-Aromatic, Floral, Floral-Fruity, Floral-Oriental, Floral-Woody, Woody-Oriental and Woody-Spicy) or the perfume storage time-period (≤ 9 months; 9-24 months; and, ≥ 24 months). Linear discriminant multivariate models were established, based on potentiometric profiles gathered by sub-sets of sensors selected using the simulated annealing algorithm, and allowed correct classification rates of 93-100% (for leave-one-out cross-validation procedure). The satisfactory analytical performance of the electronic tongue demonstrates the versatility of the proposed approach, as a practical device for preliminary perfume classification, which industrial application may be foreseen in a near future, contributing to a green-sustained economic growth of the perfume industry.
- Biological activities of selected plants of Rosaceae family employed in traditional remediesPublication . Barral Martínez, Marta; García-Oliveira, Paula; Núñez Estévez, Bernabé; Jarboui, Amira; Taofiq, Oludemi; Otero, Paz; Pinela, José; Calhelha, Ricardo C.; Simal-Gandara, Jesus; Ferreira, Isabel C.F.R.; Prieto Lage, Miguel A.; Barros, LillianDuring human history, people have searched plant species to heal their diseases, elaborating different traditional remedies. Nowadays, numerous scientific studies have demonstrated the beneficial biological properties of several plants including species of Rosaceae familywhich appears in various ethnobotanical studies as one of the most used plants in traditional medicine Crataegus monogyna Jacq., Geum urbanum (L.) and Potentilla erecta (L.) Raeusch. are some plants of this family that have been employed in several traditional remedies, but their use is still limited nowadays [1]. The objective of this study was to different biological properties of these species, to potentiate their possible use in several biobased industrial applications. Antioxidant activity was evaluated by different in vitro assays: DPPH radical scavenging assay, TBARS, OXHLIA and reducing power. Anti-inflammatory activity was assessed by the inhibition of inflammation on RAW264.7 murine macrophages. Finally, antitumor activity was tested against four tumour cell lines: MCF-7, CaCo, AGS and NCI-H460. The results showed that all plant extracts had antioxidant effects in the selected assays, especially G. urbanum and P. erecta. Aditionally, P. erecta presented the best anti-inflammatory effect, with EC50 of 50 μg/mL extract. Finally, all the species presented cytotoxic effect against the cell lines, being P. erecta the most effective, with GI50 ranging from 13 to 61 μg/mL of extract. Considering these results, the three species showed promising potential as therapeutic alternatives based on the observed bioactive properties and can be utilised in food, cosmetic and pharmaceutical formulations.
- By-products of agri-food industry as tannin-rich sources: a review of tannins’ biological activities and their potential for valorizationPublication . Fraga-Corral, Maria; Otero, Paz; Echave Álvarez, Javier; García-Oliveira, Paula; Carpena Rodríguez, María; Jarboui, Amira; Núñez Estévez, Bernabé; Simal-Gandara, Jesus; Prieto Lage, Miguel A.During recent decades, consumers have been continuously moving towards the substitution of synthetic ingredients of the food industry by natural products, obtained from vegetal, animal or microbial sources. Additionally, a circular economy has been proposed as the most efficient production system since it allows for reducing and reutilizing different wastes. Current agriculture is responsible for producing high quantities of organic agricultural waste (e.g., discarded fruits and vegetables, peels, leaves, seeds or forestall residues), that usually ends up underutilized and accumulated, causing environmental problems. Interestingly, these agri-food by-products are potential sources of valuable bioactive molecules such as tannins. Tannins are phenolic compounds, secondary metabolites of plants widespread in terrestrial and aquatic natural environments. As they can be found in plenty of plants and herbs, they have been traditionally used for medicinal and other purposes, such as the leather industry. This fact is explained by the fact that they exert plenty of different biological activities and, thus, they entail a great potential to be used in the food, nutraceutical and pharmaceutical industry. Consequently, this review article is directed towards the description of the biological activities exerted by tannins as they could be further extracted from by-products of the agri-food industry to produce high-added-value products.
- Characterization of in vitro antioxidant, antitumor and anti-inflammatory properties of plant species from Rosaceae familyPublication . Garcia-Oliveira, Paula; Barral Martínez, Marta; Jarboui, Amira; Oludemi, Taofiq; García-Pérez, Pascual; Pinela, José; Mandim, Filipa; Simal-Gandara, Jesus; Ferreira, Isabel C.F.R.; Prieto Lage, Miguel A.; Barros, LillianSince ancient times, humans have employed different plant species to prepare traditional remedies and treat diseases, due to the health-promoting effects associated with these plants. Among them, several species belonging to the Rosaceae family, namely Agrimonia eupatoria L., Filipendula ulmaria (L.) Maxim. and Rosa canina L., which have been used in different preparations, like infusions, decoctions or tinctures, to treat diverse illnesses and diseases [1]. Nowadays, the search for natural derived ingredients has prompted the study of these traditional plants. The present work aimed to evaluate the biological properties of the above-mentioned Rosaceae species, in order to promote their applications in different sectors. Antioxidant activity was evaluated by different in vitro assays: 2,2-diphenylpycrilhydrazyl (DPPH) radical scavenging assay, thiobarbituric acid reactive substances (TBARS) assay for inhibition of lipid peroxidation, OxHLIA assay for inhibition of oxidative hemolysis, and reducing power determination. Antitumor activity was tested against four tumor cell lines: MCF-7, CaCo, AGS and NCI-H460. Finally, anti-inflammatory activity was assessed by the inhibition of inflammation on lipopolysaccharide-induced RAW264.7 murine macrophages. Considering the results, all plant extracts showed antioxidant effects in the tested assays, especially F. ulmaria. All tested extracts also displayed relevant antitumor effects against the four tested tumor cell lines, mostly F. ulmaria, which exhibited the lowest growth inhibition 50 values (GI50) ranging from 34 to 86 μg/mL of extract, presenting a noteworthy cytotoxic effect. Finally, R. canina showed significant anti-inflammatory effects, with effective concentration 50 values (EC50) of 20 μg/mL of extract. Therefore, the studied plants may be considered as promising natural sources of bioactive compounds with multifunctional biological properties for the development of several biobased applications.
- An electronic tongue as a classifier tool for assessing perfume olfactory family and storage time-periodPublication . Jarboui, Amira; Marx, Ítala; Veloso, Ana C.A.; Vilaça, Daniel; Correia, Daniela M.; Dias, L.G.; Mokkadem, Yassin; Peres, António M.The identification of more than three perfumes is difficult and no analytical tool can completely replace the human olfactory system for fragrance classification. Indeed, no analytical system can mimic the human fragrance perception, being the recognition of perfume aroma patterns by conventional or sensor-based analytical tools a challenging task. For the perfume sector, the possibility of applying fast, cost-effective and green analytical devices for perfume analysis would represent a huge economic revenue. Since the perfume aroma pattern will depend on the composition of the liquid phase and on the diffusion properties of their volatile components, this work aimed to apply a potentiometric electronic tongue, comprising non-specific cross-sensitive lipid polymeric membranes, combined with chemometric techniques, as a novel perfume classifier. The multisensors device allowed establishing perfumes’ unique fingerprints, which were successfully used to discriminate men from women perfumes, to identify the perfume aroma family (Citric-Aromatic, Floral, Floral-Fruity, Floral-Oriental, Floral-Woody, Woody-Oriental and Woody-Spicy) and, assessing the perfume storage time-period (≤ 9 months; 9–24 months; and, ≥ 24 months). The established linear discriminant models were based on single-run potentiometric profiles gathered by sub-sets of sensors selected using the simulated annealing algorithm, which enabled achieving correct classification rates of 93–100% (for leave-one-out cross-validation procedure). The satisfactory performance of the electronic tongue demonstrates the versatility of the proposed approach as a practical perfume preliminary classifier sensor device, which industrial application may be foreseen in a near future, contributing to a green-sustained economic growth of the perfume industry.
- Plant antioxidants from agricultural waste: synergistic potential with other biological properties and possible applicationsPublication . Carpena Rodríguez, María; García-Oliveira, Paula; González Pereira, Antía; Soria-Lopez, Anton; Chamorro Rivo, Franklin Noel; Collazo, Nicolas; Jarboui, Amira; Simal-Gandara, Jesus; Prieto Lage, Miguel A.The increasing world population entails a great necessity to produce large amounts of food, leading to an increase in organic waste. Unlike traditional agriculture, based on the circular sustainability, modern agriculture produces tons of residues, which are accumulated in landfills or, in some cases, burnt. Numerous studies have demonstrated that agricultural residues are rich in bioactive compounds, particu- larly phenolic compounds, with antioxidant properties. Antioxidant activity has been widely related with protective effects and prevention potential for different diseases. Also, the scavenging and protective effects of antioxidant compounds have shown a connection and synergistic effect with other biological properties, such as anti-inflammatory, anti-tumor, anti-aging, neuroprotective, cardio- protective, or antidiabetic. These compounds can be applied in several fields, including food, cosmetic, and pharmaceutical industry. This chapter will be focused on the interconnected bioactive properties and possible applications of plant-origin compounds with antioxidant potential to valorize different agricultural waste.
- The use of camellias as potential antioxidant agentsPublication . Pereira, Antia Gonzalez; Jarboui, Amira; Garcia-Perez, Pascual; Taofiq, Oludemi; Simal-Gandara, Jesus; Prieto Lage, Miguel A.; Barros, LillianThe genus Camellia presents a wide geographic distribution in which three species can be highlighted: Camellia japonica for ornamental purposes, Camellia oleifera for essential oil production, and Camellia sinensis for tea production. Among them, C. japonica is characterized by its associated high socioeconomic impact in Galicia (NW Spain) due to its abundance in gardens, since, to date, its use continues to be almost exclusively ornamental. However, different chemical characterizations carried out on Camellia genus have indicated a similar composition among different species, so it would be expected that C. japonica could be used for additional purposes [1]. These applications will be determined by the chemical composition of the part used, which in turn will be influenced by the variety of camellia and environmental factors (growing area, climate, soil). One of the parts of greatest interest are the flowers since it has been shown that the petals of C. japonica have a high content of phenolic compounds that make them potential sources of bioactive compounds for medicinal and cosmetic use [2]. In this work, a standard extraction (maceration) was carried out using a methanol: water mixture (60:40) as solvent to evaluate the bioactivity of the flowers of different varieties of C. japonica. Among the 8 varieties analyzed, two of them (Elegans variegated and Grandiflora Superba) were characterized by having a high antioxidant capacity, as observed in terms of 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity of 136.5 and 86.8 μg/mL respectively. Overall, it can be concluded that camellias are a potential source of antioxidants with application in food and nutraceutical industries.