Effects of thermo-vacuum treatment on secondary metabolite content and antioxidant activity of poplar (Populus nigra L.) wood extracts

Todaro, Luigi; Russo, Daniela; Cetera, Paola; Milella, Luigi

doi:10.1016/j.indcrop.2017.08.052

Cited by 60 publications

(64 citation statements)

References 35 publications

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“…The results of ABTS test of poplar buds and willow bark were also expressed as the IC 50 value (Zaiter et al 2016;Zhang et al 2015b). Todaro et al (2017) determined TAC in terms of radical scavenging ability using the stable DPPH. The reduction of the radical by antioxidants was followed by a decrease in the absorbance.…”

Section: Total Antioxidant Capacity (Tac) Total Phenolic Content (Tpmentioning

confidence: 99%

“…The color intensity is proportional to the antioxidant concentration of the sample (Kuś et al 2018;Sergent et al 2014;Tálos-Nebehaj et al 2017;Todaro et al 2017). Black locust extracts showed a large antioxidant capacity of 6.5-8.1 mmol Fe 2+ /kg extract (363-452 mg Fe 2+ /kg extract).…”

Section: Total Antioxidant Capacity (Tac) Total Phenolic Content (Tpmentioning

confidence: 99%

“…In other studies, Trolox as the FRAP standard (Todaro et al 2017) and ascorbic acid (Tálos-Nebehaj et al 2017) were used as well as TAC was expressed in the effective concentration values (EC 50 ) as in the case of DPPH (IC 50 ) (Durak and Gawlik-Dziki 2014). Todaro et al (2017) assessed different temperatures of thermo-vacuum treatment (180, 200, 220 °C) and also extraction techniques of poplar wood (maceration, ultrasound-assisted extraction-UAE, and accelerated-solvent extraction-ASE). It turned out that the extracts obtained by UAE (220 °C) showed the highest TAC, even of 752.3 mg TE/g d.e.…”

Section: Total Antioxidant Capacity (Tac) Total Phenolic Content (Tpmentioning

confidence: 99%

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Characterization of bioactive compounds in the biomass of black locust, poplar and willow

Tyśkiewicz

Konkol

Kowalski

et al. 2019

Trees

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Key message Liquid chromatography is the main method for assaying bioactive compounds in biomass. Total phenolic content and antioxidant capacity are measured with spectroscopy. Phenolics are the most important bioactive substances in short rotation coppice. Secondary metabolites of black locust, willow and poplar have many different activities. The richest source of bioactive compounds are flowers, bark and buds. Abstract The black locust (Robinia pseudoacacia), willow (Salix spp.) and poplar (Populus spp.) may be the source of the biomass obtained from natural habitats as well as intentionally established plantations in the system of short rotation coppice. These species are promising candidates as an alternative source of bioactive compounds in researches for developing new bioproducts for multidirectional uses, including polymers, lubricants, construction materials, pharmaceuticals, as well as bioenergy and fuels. Various parts of plants, such as leaves, flowers, seeds, bark, woods, buds, catkins, whole tree material and bee products (honey, propolis) are a source of bioactive compounds. The characterization of these compounds, especially phenolic compounds (flavonoids, stilbenes, lignans, phenolic acids, tannins and phenolic glucosides), fatty acids, sterols, etc. may be determined by a variety of analytical (spectroscopy, chromatography) and extraction methods. This review contains 131 references and systematize all available data on the characterization of the bioactive compounds in the biomass of black locust, poplar and willow by analytical and extraction methods.

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Section: Total Antioxidant Capacity (Tac) Total Phenolic Content (Tpmentioning

confidence: 99%

Section: Total Antioxidant Capacity (Tac) Total Phenolic Content (Tpmentioning

confidence: 99%

Section: Total Antioxidant Capacity (Tac) Total Phenolic Content (Tpmentioning

confidence: 99%

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Characterization of bioactive compounds in the biomass of black locust, poplar and willow

Tyśkiewicz

Konkol

Kowalski

et al. 2019

Trees

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“…Populus spp., belonging to the Salicaceae family, are one of the most cultivated woody plants for industrial purposes. Its wood is one of the least expensive hardwoods and, although rarely used in the production of fine furniture, it is extensively used for pulp, panel productions and many other commercial applications [30,31]. These fast-growing trees therefore have a large economic impact worldwide, together with a significant importance from an environmental perspective [32].…”

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confidence: 99%

Chitosan-Based Coatings to Prevent the Decay of Populus spp. Wood Caused by Trametes Versicolor

et al. 2018

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Chitosan and chitosan oligomers are receiving increasing attention due to their antimicrobial properties. In the present study, they were assayed as a preventive treatment against white-rot decay of Populus wood (very important in economic and environmental terms), caused by Trametes versicolor fungus. Their capacity to incorporate different chemical species into the polymer structure with a view to improving their anti-fungal activity was also assessed by mixing oligo-chitosan with propolis and silver nanoparticles. The minimum inhibitory concentration of medium-molecular weight chitosan (MMWC), chitosan oligomers (CO), propolis (P), nanosilver (nAg), and their binary and ternary composites against T. versicolor was determined in vitro. Although all products exhibited anti-fungal properties, composites showed an enhanced effect as compared to the individual products: 100% mycelial growth inhibition was attained for concentrations of 2.0 and 0.2 mg·mL −1 for the CO-P binary mixture, respectively; and 2 µg·mL −1 for nAg in the ternary mixture. Subsequently, MMWC, CO, CO-P and CO-P-nAg composites were tested on poplar wood blocks as surface protectors. Wood decay caused by the fungus was monitored by microscopy and vibrational spectroscopy, evidencing the limitations of the CO-based coatings in comparison with MMWC, which has a higher viscosity and better adhesion properties. The usage of MMWC holds promise for poplar wood protection, with potential industrial applications. Coatings 2018, 8, 415 2 of 15its main characteristics, such as its bioactivity, non-toxicity or biodegradability, its antimicrobial effect is especially relevant [4][5][6]. Its activity against different fungi, gram positive and gram negative bacteria, is ascribed to the positive charge of amino group (NH 3 + ), which interacts electrostatically with the surface of the cellular membrane, destabilizing it. As a consequence, the presence of chitosan inside the cell can lead to intracellular responses such as inactivation or blocking of enzymes activities, and of DNA transcription and translation [7,8].The antifungal activity of chitosan not only depends on the fungus species, but also on its molecular weight (MW), polymerization degree (PD) or deacetylation degree (DD). For instance, chito-oligosaccharides with low MW, PD and DD have been reported to be more effective on phytopathogenic fungi than chitosan with higher MW, PD or DD [9][10][11].Another known advantage from chitosan and its oligomers is associated with their sorption and chelating properties. The cationic nature of the polymer allows it to bind to different chemicals species, ranging from organic macromolecules to metal nanoparticles [12][13][14]. Natural oils or extracts of natural products can be incorporated into the chitosan matrix, for example, by cross-linking, producing solutions, films or beads [15][16][17]. In the particular case of propolis, its polyphenols have been reported to form hydrogen bonds and covalent bonds with the functional groups in chitosan [18]. This results...

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“…Extractives are chemicals in wood that can be extracted using different solvents, for example: water, neutral organic solvents, or steam volatilization. The extractives are present in the bark, leaves and needles, flowers, fruits, and seeds, and almost always, the quantities in these parts of the tree are proportionally larger than in the inner parts of the tree (Todaro et al, 2017;Fu et al, 2018). The extractives are often responsible for certain characteristics of wood, such as: color, smell, natural resistance to rot, taste, and abrasive properties.…”

Section: Introductionmentioning

confidence: 99%

Phytochemical Analysis of Extracts from the Atlantic Forest Wood Species

et al. 2019

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The extractives are responsible for some characteristics of wood, such as color, smell, natural resistance to rot, taste, and abrasive properties. In addition, its content and composition vary between wood species. The objective of this work was to present a phytochemical analysis of wood extractives of native species from the Atlantic Forest, aiming at the characterization of some classes of secondary metabolites. Phytochemical tests for the detection of classes of metabolites present in Croton Urucurana Baill, Pelthoforum dubium (Spreng.) Taub., Jacaranda cuspidifolia Mart., and Hymenaea courbaril L. were carried out with crude wood, hydrophilic extract (methanol), and lipophilic extract (cyclohexane). Phytochemical analysis detected the presence of alkaloids, phenolic compounds, and triterpenoids in all the hydrophilic extracts of the species studied. Saponins were only detected in P. dubium and J. cuspidifolia. Phytochemical analysis permitted the identification of several metabolites, suggesting possible pharmacological actions of the species studied.

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Effects of thermo-vacuum treatment on secondary metabolite content and antioxidant activity of poplar (Populus nigra L.) wood extracts

Cited by 60 publications

References 35 publications

Characterization of bioactive compounds in the biomass of black locust, poplar and willow

Characterization of bioactive compounds in the biomass of black locust, poplar and willow

Chitosan-Based Coatings to Prevent the Decay of Populus spp. Wood Caused by Trametes Versicolor

Phytochemical Analysis of Extracts from the Atlantic Forest Wood Species

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