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Projeto de investigação
Design of cellulose-synthetic hybrid polymer vehicles for polyphenols uptake/release combining controlled radical polymerization with molecular imprinting technique
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Supercritical CO2 extraction and purification of bioactive compounds in olive leaf with molecularly imprinted polymers
Publication . Gomes, Catarina; Ayssata, Almeida; Dias, Rolando; Martins, Cláudia F.D.; Costa, Mário Rui
Around 4.5 million tons of leaves are generated each year as a by-product of the olive and
olive-oil production. These olive leaves must be removed from the fields and olive-mills.
Usually they are burned, or else used as fuels or for animal feed. However, olive leaf is
extremely rich in bio-resources, being estimated that around 1 million tons of bioactive
compounds, 1 million tons of cellulose and 1.5 million tons of lignin are currently
underexploited [1]. In particular, the extraction and isolation of high-added value
bioactive compounds in olive leaf (e.g. polyphenols, triterpenoids, essential oils, lipids,
lignocellulose) is especially appealing due to their high-market potential in the food, feed,
chemical, nutraceutical, cosmetic and pharmaceutical sectors
Carbon-based hydrogels
Publication . Bzainia, Amir; Gomes, Catarina P.; Dias, Rolando; Costa, Mário Rui
This chapter intends to give insight into the use of carbon-based hydrogels for energy storage and/or conversion, which are becoming critical, given the ongoing need for decarbonization and growing renewable energy production. The ability to use sustainable materials and the added advantage to incorporate tailor-made, nontoxic, cheap, and electrochemically active functional moieties during their synthesis make them frontrunner materials in the field of green chemistry and energy applications. Here, after a brief introduction of graphene-, synthetic polymer-, and natural polymer-based hydrogels and many possibilities for their hybrid combination, a particular emphasis is given to their application to energy storage, energy conversion, and energy efficiency enhancement systems. Application examples concerning metal-air batteries, fuel cells, water electrolyzers, microbial fuel cells, photoelectrochemical water splitting, supercapacitors, lithium-ion batteries, and other metal-ion batteries, desalination, and water purification through solar vapor generation are highlighted.
Scale-up of a sorption process working with molecularly imprinted adsorbents for enrichment of winemaking residues and improvement of bioactivity
Publication . Gomes, Catarina; Duarte, Cristina N.; Martins, Cláudia D.; Amaral, Joana S.; Igrejas, Getúlio; Pereira, Maria João; Costa, Mário Rui; Dias, Rolando
This work presents the scale-up of a sorption process for the fractionation and enrichment of bioactive compounds in winemaking residues using molecularly imprinted adsorbents. The process works with hydroalcoholic solvents and the improvement of the bioactivity of the produced fractions, comparatively to the raw extracts, is demonstrated. The proposed approach was experimentally validated through the designing and running of a pilot size sorption prototype for the automation of the fractionation method. The synthesis of the molecularly imprinted adsorbents was made at the gram-scale and spent diatomaceous earth, used for wine filtration, was considered as a possible source of bioactive compounds in winemaking residues. The different fractions produced were evaluated for their antioxidant activity through three different assays, namely radical scavenging activity, reducing power and inhibition of lipid peroxidation. The results obtained show the improvement of the bioactivity of most of the fractions comparatively to the original diatomaceous earth extract. The most enriched fraction is estimated to have a total phenolic content c.a. 3.8 times higher than the original extract. The radical scavenging activity, the reducing power and the inhibition of lipid peroxidation for this fraction were measured to be 6.4, 4.2 and 4.5 times higher, respectively, than the initial diatomaceous earth extract. This work provides new insights on biomass valorisation and circular bioeconomy by combining in the same research materials development, process design and application to real extracts with proved improvement of the bioactivity of purified products.
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Fundação para a Ciência e a Tecnologia
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2020.06057.BD