Separation and recovery of polyphenols and carbohydrates from Eucalyptus bark extract by ultrafiltration/diafiltration and adsorption processes

Pinto, Paula C. Rodrigues; Mota, Maria Inês Ferreira da; Pereira, Carla; Ribeiro, Ana M.; Loureiro, José M.; Rodrigues, Alírio E.

doi:10.1016/j.seppur.2017.04.003

Cited by 24 publications

(9 citation statements)

References 25 publications

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“…1/10 v/v) was used in the first stages. The extraction and the cleaning with a methanol/acetic acid mixture (90: 10) were afterwards carried out in order to remove impurities and the bonded polyphenol template. The washing processes were monitored through UV-vis spectroscopy measurements up to the time at which the level of the template molecule became lower than the detection limit.…”

Section: Isolation and Purification Of The Polymer Particlesmentioning

confidence: 99%

Development of Molecularly Imprinted Polymers to Target Polyphenols Present in Plant Extracts

et al. 2017

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Abstract:The development of molecularly imprinted polymers (MIPs) to target polyphenols present in vegetable extracts was here addressed. Polydatin was selected as a template polyphenol due to its relatively high size and amphiphilic character. Different MIPs were synthesized to explore preferential interactions between the functional monomers and the template molecule. The effect of solvent polarity on the molecular imprinting efficiency, namely owing to hydrophobic interactions, was also assessed. Precipitation and suspension polymerization were examined as a possible way to change MIPs morphology and performance. Solid phase extraction and batch/continuous sorption processes were used to evaluate the polyphenols uptake/release in individual/competitive assays. Among the prepared MIPs, a suspension polymerization synthesized material, with 4-vinylpyridine as the functional monomer and water/methanol as solvent, showed a superior performance. The underlying cause of such a significant outcome is the likely surface imprinting process caused by the amphiphilic properties of polydatin. The uptake and subsequent selective release of polyphenols present in natural extracts was successfully demonstrated, considering a red wine solution as a case study. However, hydrophilic/hydrophobic interactions are inevitable (especially with complex natural extracts) and the tuning of the polarity of the solvents is an important issue for the isolation of the different polyphenols.

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Section: Isolation and Purification Of The Polymer Particlesmentioning

confidence: 99%

Development of Molecularly Imprinted Polymers to Target Polyphenols Present in Plant Extracts

et al. 2017

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“…This residue can, however, still present interesting levels of polysaccharides -61%, but also extractives (9.86%) and lignin (21.86%) [19]. Recent studies on these residues already showed their potential in the production/recovery of polyphenols [17,20], lignin [21], glucose [16], as well as solid fuels [19].…”

Section: Introductionmentioning

confidence: 99%

Co-production of biofuels and value-added compounds from industrial Eucalyptus globulus bark residues using hydrothermal treatment

Gomes

Michelin

Romaní

et al. 2021

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In this work, hydrothermal treatment was assessed for the fractionation of industrial Eucalyptus globulus bark residue (EBR) to obtain biofuels and value-added compounds (such as oligosaccharides and phenolic compounds) in separated streams. Hydrothermal treatment was evaluated under non-isothermal regimen in the range of maximum temperature (T max) of 177-228 • C or severities (S 0) between 2.76 and 4.25. The highest oligosaccharides concentration (17.5 g/L) was achieved at S 0 of 3.69, corresponding to hemicellulose recovery of 77.30%. Under all severities evaluated in this work, over 90.94% and 84.17% of cellulose and lignin remained in the solid phase, respectively. The increase of S 0 improved 4.38-fold the enzymatic saccharification of cellulose, the highest glucose yield (84%) being achieved at S 0 of 4.04. Considering the maximal recovery of polysaccharides as glucose and oligosaccharides from the liquid and solid phases, S 0 of 4.04 was selected for bioethanol production using high solid loadings and following different strategies (simultaneous saccharification and fermentation-SSF and pre-saccharification and simultaneous saccharification and fermentation-PSSF). The utilization of 15% hydrothermally pretreated EBR without nutrient supplementation resulted in 26 g/L of ethanol, independently of the strategy used. An increase up to 17.5% solids and employing nutrient supplementation enabled the production of 38 g/L (or 4.8% v/v) of ethanol by PSSF.

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“…They are an excellent alternative to conventional methodologies due to their low energy and no-additives requirements, mild conditions of temperature and pressure and easy scale-up. Pressure-driven membrane processes (microfiltration (MF), ultrafiltration (UF), nanofiltration (NF), and reverse osmosis (RO)) were largely explored by Portuguese researchers for the separation, purification, and concentration of bioactive compounds from several agri-food by-products, including grape pomaces [136,137], corn fibre and Eucalyptus bark [138,139].…”

Section: Membrane Processes In Biorefinerymentioning

confidence: 99%

“…Restolho et al [142] studied the recovery of sugars and lignosulphonates from eucalyptus spent sulphite liquor by pressure-driven membrane processes. Pinto et al [139] investigated the processing of ethanol: water extract of Eucalyptus globulus bark containing bioactive polyphenols by dia-ultrafiltration (DF) and adsorption/desorption process. Preconcentration followed by DF with a 30 kDa membrane provided an increment of 21% and 64% of total phenolic compounds (TPC) and proanthocyanidins (Pac), respectively, relative to the initial extract composition.…”

Section: Membrane Processes In Biorefinerymentioning

confidence: 99%

Overview of Membrane Science and Technology in Portugal

et al. 2022

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Membrane research in Portugal is aligned with global concerns and expectations for sustainable social development, thus progressively focusing on the use of natural resources and renewable energy. This review begins by addressing the pioneer work on membrane science and technology in Portugal by the research groups of Instituto Superior Técnico—Universidade de Lisboa (IST), NOVA School of Science and Technology—Universidade Nova de Lisboa (FCT NOVA) and Faculdade de Engenharia—Universidade do Porto (FEUP) aiming to provide an historical perspective on the topic. Then, an overview of the trends and challenges in membrane processes and materials, mostly in the last five years, involving Portuguese researchers, is presented as a contribution to a more sustainable water–energy–material–food nexus.

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Separation and recovery of polyphenols and carbohydrates from Eucalyptus bark extract by ultrafiltration/diafiltration and adsorption processes

Cited by 24 publications

References 25 publications

Development of Molecularly Imprinted Polymers to Target Polyphenols Present in Plant Extracts

Development of Molecularly Imprinted Polymers to Target Polyphenols Present in Plant Extracts

Co-production of biofuels and value-added compounds from industrial Eucalyptus globulus bark residues using hydrothermal treatment

Overview of Membrane Science and Technology in Portugal

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