DCFQE - Comunicações a Conferências / ConferenceItem
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Todo o tipo de documentos relacionados com uma conferência; ex.: artigos de conferências, relatórios de conferências, palestras em conferências, artigos publicados em proceedings de conferências, relatórios de abstracts de artigos de conferência e posters de conferências.
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- Laurus Azorica Leaves : Sesquiterpene Lactones and Antiaging ActivityPublication . Viveiros, Mariana Moniz; Barreto, Maria do Carmo; Seca, Ana M. L.Plants are a relevant source of biologically active compounds for skin protection. Laurus azorica (Seub.) Franco, an endemic species from Azores, was traditionally used as a disinfectant, and the oil from its berries was used to treat wounds. This species is barely studied concerning its chemical constituents and biological activities. In this study, three sesquiterpene lactones, costunolide, 11,13-dehydrosantonin and reynosin, were isolated for the first time on the hexane fraction of the ethanol extract from Laurus azorica leaves by chromatographic techniques. […].
- Valorization of Macaronesia Beach-Cast Seaweeds : Secondary Metabolites and Antiaging ActivityPublication . Seca, Ana M. L.; Faustino, Luís M. M.; Viveiros, Mariana Moniz; Rosa, Gonçalo P.; Barreto, Maria do CarmoBeach-cast seaweeds are a seasonal phenomenon consisting of the accumulation of large tons of algae on beaches, which is unpleasant for beach users and affects the tourism industry, mainly because tourists often interpret stranded natural litter as lowering beach quality, especially if the material starts to decompose. These beach casts are always variable mixtures of different species of seagrass and seaweeds. The present work aimed to contribute to the valorisation of this biomass by studying its chemical composition and bioactivities that reveal its potential in the pharmaceutical and/or cosmeceutical industries. […].
- Kaempferol Derivatives from Hedychium gardnerianum : Unveiling the Potential of an Invasive PlantPublication . Tavares, Wilson R.; Barreto, Maria do Carmo; Seca, Ana M. L.The therapeutic properties of plants and of their secondary metabolites are a current research topic of great interest. Considering that Hedychium species are used in folk medicine around the globe, Hedychium gardnerianum Sheppard ex Ker Gawl., an extremely aggressive invasive plant in Hawaii and in Azores, was selected and phytochemically studied in order to search for natural compounds with interesting biological activities. […].
- Cosmeceutical Potential of the Green Macroalga Caulerpa ProliferaPublication . Rosa, Gonçalo P.; Seca, Ana M. L.; Barreto, Maria do Carmo; Pinto, Diana C. G. A.The present cosmeceutical industry has been gradually shifting its interest from products based on synthetic compounds to macroalgae-based products due to their interesting antiaging properties but also to their lower cytotoxicity and allergens content. Molecules isolated from macroalgae already showed potential as either active cosmetic ingredients or key elements for the consistency of the cosmetic formulation. In this regard, it is of foremost importance to keep studying the chemical composition of different algal species, aiming to find new compounds with cosmeceutical potential. […].
- Biotechnological conversion of Azorean bovine cheese whey for the production of bio-energyPublication . Rego, E.; Paiva, Lisete S.; Lima, Elisabete; Baptista, JoséThe world's economies, in most countries, are heavily dependent on fossil fuels. This reliance is becoming increasingly problematic taking into account that reserves are rapidly depleting, and no less important is the strong effect of fossil fuel emissions on the global carbon cycle. […].
- Anti-aging activity of Lobophora variegata ethanolic and methanolic extracts and their fractionsPublication . Rosa, Gonçalo P.; Costa, Ana C.; Medeiros, D.; Seca, Ana M. L.; Barreto, Maria do CarmoSeaweed have promising applications within food, cosmetic and health industries, which led to an increased interest in studying these organisms [1]. In several coastal areas, thousands of tons of macroalgae are cast on beaches and shorelines and it would be very interesting if this biomass could be managed, allowing the extraction of added-value compounds. In this context, polar extracts (methanol and ethanol) of a macroalgal beach cast sample mainly composed of “Lobophora variegate” were prepared and the anti-aging and antioxidant activities were evaluated. The preliminary results showed interesting results, and thus these crude extracts were then fractionated sequentially by their solubility in dichloromethane, acetone and ethyl acetate, resulting in 4 semi-pure fractions each, which were also tested. Fractions A1.1.1 and A1.2.3 were very good tyrosinase inhibitors (IC₅₀ = 37.87 and 24.01 μg/mL, respectively) and fractions A1.1.2 and A1.2.2 presented very good inhibition of elastase (IC₅₀ = 44.76 and 20.86 μg/mL, respectively). However, none of the fractions was active against collagenase. These results show that further purifications of these fractions can lead to the isolation of bioactive added-value compounds.
- GC- and UHPLC-MS Profiles as a Tool to Valorizate the Red Alga Asparagopsis armataPublication . Lesenfants, Marie L.; Seca, Ana M. L.; Silva, Artur M. S.; Pinto, Diana C. G. A.Asparagopsis armata is considered a biological invader and this red alga is in the last few years one of the worst nightmares for Azores coast biodiversity. So efforts to find an economically valuable application are welcome. In this context biological evaluations of its extracts, such as anti-aging, antioxidant and anticholinesterasic activities, were recently presented [1,2]. Naturally, the knowledge of this species chemical composition is utmost importance not only to find some valuable utilization but also to discovery its mechanisms of defence that can explain its invasive behaviour. In our effort to contribute to this problem solution we establish the GC-MS and UHPLC-MS profiles of both the non-polar and polar extracts. The main compounds in the lipophilic extract were palmitic acid and 1-monopalmitin and brominated compounds dominate both extracts. The detailed results will be presented and discussed in the presentation.
- GC-MS profile of Calendula L. species : a comparative analysisPublication . Faustino, Maria V.; Seca, Ana M. L.; Silveira, Paulo; Silva, Artur M. S.; Pinto, Diana C. G. A.
- The edible Fucus spiralis life-cycle : GC-MS profile analysisPublication . Seca, Ana M. L.; Aguiar, Nuno F. B.; Gouveia, Vera L. M.; Silva, Artur M. S.; Pinto, Diana C. G. A.Fucus spiralis Linnaeus, known in Azores as "Fava-do-mar'' is an edible brown macroalga (Ochrophyta (Phaeophyceae)) which can be found on rocks at upper intertidal leveis, where it forms a patchy zone. It is the only member of the genus Fucus that can be found in Azores and its receptacles are eaten as a local delicacy. Nutritionally, it is very rich in fiber (crude content 63.9% dw) contains important minerais Na, K, Mg, Ca and low content in lipids (5.2%). This edible seaweed is also rich in secondary metabolites, such as phlorotannins, sterols and fatty acids, which are associated with several biological activities. From the human health point ofview, all the above mentioned constituents are of extreme importance and show the potential of F. spiralis as a nutraceutical product. […].
- Cystoseira abies-marina life cycle : comparative study of its polar profile by RP-HPLC-DAD-MSPublication . Seca, Ana M. L.; Lopes, Diana; Gouveia, Vera L. M.; Silva, Artur M. S.; Pinto, Diana C. G. A.Macroalgae, are largely used in food, pharmaceutical and cosmetics industries. Cystoseira abies-marina (S.G. Gmelin) C. Agardh is a brown macroalgae (Phaeophyta) which belongs to Cystoseira genus and is distributed in the Mediterranean, Macaronesian Region and the coast of Africa. In the Azores lslands, it grows abundantly in the intertidal zone where it is pioneer and attains large size. Since intertidal seaweeds are exposed to extreme stress conditions (temperatura, UV, water levei) in addition to herbivory and fouling, they develop protective mechanisms, some of which involve the biosynthesis of metabolites with properties that may be useful to man (e.g. natural antioxidants, antifouling agents, novel UV sunscreens). The dichlormethane extract of C. abies-marina from Azares was studied revealing the presence of meronorditerpenoids with cytotoxic and antioxidant activities. In this research the antioxidant activity and chemical composition of the ethyl acetate fraction of C. abies-marina methanolic extract was studied. C. abies-marina was collected in two phases of its life cycle üuvenile phase and mature phase). […].