Search Results - "Popa, Valentin I"

Characterization and Bioactivity of Polysaccharides Separated through a (Sequential) Biorefinery Process from Fucus spiralis Brown Macroalgae by Filote, Cătălina, Lanez, Elhafnaoui, Popa, Valentin I., Lanez, Touhami, Volf, Irina

“…Marine macroalgae biomass is a valuable renewable resource that can be used for the development of bioeconomy through the valorisation of valuable compounds…”
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A critical review of methods for characterisation of polyphenolic compounds in fruits and vegetables by Ignat, Ioana, Volf, Irina, Popa, Valentin I.

“…► Natural sources of phenolic compounds. ► Detailed classification of polyphenols. ► Extraction methods for phenolic compounds. ► Methods for quantification…”
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Comparison Adsorption of Cd (II) onto Lignin and Polysaccharide-Based Polymers by Ungureanu, Elena, Fortună, Maria E., Țopa, Denis C., Brezuleanu, Carmen O., Ungureanu, Vlad I., Chiruță, Ciprian, Rotaru, Razvan, Tofanica, Bogdan M., Popa, Valentin I., Jităreanu, Doina C.

“…Given the predominantly negative impact of heavy metals on living organisms, the present study proposed to evaluate the adsorption performances under static…”
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Phenolic compounds and antioxidant activity of lingonberry (Vaccinium vitis-idaea L.) leaf, stem and fruit at different harvest periods by Bujor, Oana-Crina, Ginies, Christian, Popa, Valentin I., Dufour, Claire

“…•Fifty-one phenolic compounds were newly identified or named in lingonberry extracts.•Arbutin represents 31–50% of the phenolic pool in leaf.•Leaf and stem…”
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Obtaining lignin nanoparticles by sonication by Gilca, Iulian Andrei, Popa, Valentin I., Crestini, Claudia

“…•The paper present a physical method to obtain nanoparticles based on lignin.•The nanoparticles were characterized from morphological and dimensional point of…”
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Kinetic modeling of the ultrasound-assisted extraction of polyphenols from Picea abies bark by Lazar, Liliana, Talmaciu, Adina Iulia, Volf, Irina, Popa, Valentin I.

“…In this paper, the kinetics of polyphenols extraction from spruce bark (Picea abies) under ultrasounds action was investigated. Studies were performed in order…”
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Seasonal variations of the phenolic constituents in bilberry (Vaccinium myrtillus L.) leaves, stems and fruits, and their antioxidant activity by Bujor, Oana-Crina, Le Bourvellec, Carine, Volf, Irina, Popa, Valentin I., Dufour, Claire

“…•Forty-six phenolic compounds were newly identified in bilberry extracts.•Caffeoyl derivatives and quercetin hexuronide were major components in leaves.•A-type…”
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Enhancing copper and lead bioaccumulation in rapeseed by adding hemp shives as soil natural amendments by Tanase, Corneliu, Volf, Irina, Popa, Valentin I.

“…The current study reveals the results of a phytoremediation process applied to a multi metal contaminated soil, located in close proximity to an energy power…”
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Optimization of ultrasound-assisted extraction of polyphenols from spruce wood bark by Ghitescu, Roxana-Elena, Volf, Irina, Carausu, Constantin, Bühlmann, Ana-Maria, Gilca, Iulian Andrei, Popa, Valentin I.

“…•Spruce bark (picea abies) is a rich source of phenolic compounds with antioxidant activity.•Non-toxic solvent was used (ethanol and water).•Effects of…”
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A Comparative Analysis of the 'Green' Techniques Applied for Polyphenols Extraction from Bioresources by Talmaciu, Adina Iulia, Volf, Irina, Popa, Valentin I.

“…From all the valuable biomass extractives, polyphenols are a widespread group of secondary metabolites found in all plants, representing the most desirable…”
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Isolation of bioactive compounds from spruce bark waste using sub- and supercritical fluids by Talmaciu, Adina Iulia, Ravber, Matej, Volf, Irina, Knez, Željko, Popa, Valentin I.

“…[Display omitted] •Industrial spruce bark wastes were used as a source of natural phenolic compounds.•A two steps extraction was applied to fractionate…”
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Phosphorylation of polysaccharides: New results on synthesis and characterisation of phosphorylated cellulose by Suflet, Dana Mihaela, Chitanu, Gabrielle Charlotte, Popa, Valentin I.

“…New results regarding the synthesis and characterization of water-soluble phosphorylated cellulose by reaction of microcrystalline cellulose with phosphorous…”
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Biorefinery of marine macroalgae into high-tech bioproducts: a review by Filote, Catalina, Santos, Sílvia C. R., Popa, Valentin I., Botelho, Cidália M. S., Volf, Irina

“…Pollution and climate change induced by fossil fuel usage are calling for the development of a circular bioeconomy based on carbon neutral resources such as…”
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Wood fibres for papermaking by Area, Maria Cristina, Popa, Valentin

“…Firs and pines dominated the global picture of the raw materials for paper industry until the 1950s. At that time, the interest in introducing new species,…”
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Encapsulation of polyphenols into pHEMA e-spun fibers and determination of their antioxidant activities by Ghitescu, Roxana-Elena, Popa, Ana-Maria, Popa, Valentin I., Rossi, Rene M., Fortunato, Giuseppino

“…[Display omitted] This study reports on the development of electrospun poly(2-hydroxyethyl methacrylate) (pHEMA) fibers loaded with synthetic and natural…”
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New approaches concerning the utilization of natural amendments in cadmium phytoremediation by Stingu, Alina, Volf, Irina, Popa, Valentin I., Gostin, Irina

“…► This study analyzed the influence of naturally bioactive compounds in cadmium phytoremediation. ► The changes were analyzed through morpho-physiological and…”
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CONTRIBUTION TO THE STUDY OF HYDROXYMETYLATION REACTION OF ALKALI LIGNIN by Teodor Malutan, Raluca Nicu, Valentin I. Popa

“…The hydroxymethylation of alkali lignin with formaldehyde in alkaline solution was studied. The influence of reaction conditions of the hydroxymethylation of…”
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Catechin loaded PLGA submicron-sized fibers reduce levels of reactive oxygen species induced by MWCNT in vitro by Ghitescu, Roxana-Elena, Popa, Ana-Maria, Schipanski, Angela, Hirsch, Cordula, Yazgan, Gökce, Popa, Valentin I., Rossi, René M., Maniura-Weber, Katharina, Fortunato, Giuseppino

“…[Display omitted] Reactive oxygen species (ROS) are common products of normal aerobic cellular metabolism, but high levels of ROS lead to oxidative stress and…”
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Lignin modification by epoxidation by Malutan, Theodor, Nicu, Raluca, Popa, Valentin I.

“…The chemical modification of lignin through hydroxymethylation and epoxidation is a way to develop new application fields and improvement of lignin…”
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Changes of supramolecular cellulose structure and accessibility induced by the processive endoglucanase Cel9B from Paenibacillus barcinonensis by Chiriac, Alina I, Pastor, Francisco I. Javier, Popa, Valentin I, Aflori, Magdalena, Ciolacu, Diana

“…A newly identified cellulase with a high polysaccharide degrading potential and a processive mode of action, has been evaluated on cellulose fibers. Cellulase…”
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