Evaluation of the impact of pre-treatment and extraction conditions on the polyphenolic profile and antioxidant activity of Belgium apple wood

This study describes the possibilities of valorising a waste stream that originates from apple wood by mapping the reducing capacity and phenolic profile from extracts derived from apple tree (Malus domestica). This study evaluated the efficiency of warm solvent extraction (WSE) and ultrasound-assisted extraction (UAE) techniques for extracting antioxidant phenolic compounds from the bark and core wood of an apple tree cultivated in the north-eastern part of Belgium. Furthermore, the influence of the pre-treatment technique, namely, fresh, oven-dried, and freeze-dried samples, respectively, on the yield of polyphenols was studied. Fresh bark extract obtained by UAE—the most efficient extraction technique—employing acetone 60% v/v contains the highest levels of phenolic compounds as well as the highest antioxidant activity. High-performance liquid chromatographic analysis shows that phloridzin is the major compound of the identified polyphenol markers present in bark and core wood extracts. Based on the obtained results, it may be possible to produce a polyphenolic extract from apple wood at an industrial scale without extensive costs or altering the antioxidant properties. This study reveals the potential of apple tree wood residues valorisation through the recovery of phenolic compounds for food, pharmaceutical, and cosmetic applications.Annick Boeykens is a beneficiary of a PWO (‘Projectmatig Wetenschappelijk Onderzoek’) Grant, provided to Odisee by the Flem-ish Government, for the investigation project ‘Phenolic compounds in by-products’. Manuela M. Moreira (SFRH/BPD/97049/2013) wishes to acknowledge Fundo Social Europeu and Ministério da Ciência, Tecnologia e Ensino Superior for funding her postdoctoral fellowship by means of a POPH-QREN—Tipologia 4.1—Formação Avançada. The financial support from FCT/MEC through national funds and cofi-nanced by FEDER, under the Partnership Agreement PT2020 through the project UID/QUI/50006/2013—POCI/01/0145/FEDER/007265 and the project 6818—Transnational Cooperation, Agreement between Por-tugal (FCT) and Serbia (MSTD) are also acknowledged.info:eu-repo/semantics/publishedVersio

Optimalisation and polyphenol profiling of enzymatically assisted extraction of various apple varieties

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The influence of solvent type and enzyme inhibitor on the ultrasound-assised extraction of polyphenols from various apple varieties

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Phenolic Composition, Antimicrobial and Antioxidant Properties of Belgian Apple Wood Extracts

Each year, fruit growers have hundreds of tons of bark and pruning waste. Despite their potential for chemical recycling, residues from this waste are frequently used for applications with low added value. By converting the waste stream into a valuable source, this study emphasizes waste valorisation and engenders re-use strategies for the production of higher value products. The aim of the present work is the optimization of the solvent extraction of phenolic compounds from apple trees, more specifically bark and core wood. Solvent extractions, with a varying solvent composition, are assessed based on the extraction efficiency of the total polyphenols and flavonoids (spectrophotometry). The extracts are further characterized by their antimicrobial properties and antioxidant activities. Bark extracts obtained by a 40 v/v % acetone/ water mixture presented the highest phenolic (22.84 ± 0.56 mg GAE/g DW) and flavonoid (12.16 ± 0.06 mg QC/g DW) content, and antioxidant activity (1.068 ± 0.005 mM FeSO4.7H2O/g DW for the FRAP assay), while the extract also inhibited growth of the gram-positive bacteria Enterococcus faecalis and Staphylococcus aureus by 100 %. The results indicate that warm solvent extraction (WSE) proved to be an efficient way to extract polyphenols with a high reducing ability from bark and core wood of apple trees.status: Published onlin

How to start an apple wood revolution? - Characterization of phenolic compounds from apple wood

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Characterization of phenolic compounds from apple root, bark and core wood

status: publishe

Phenolic composition, antioxidant and antimicrobial properties of apple and pear pruning wood residues

status: publishe

Evaluation of the impact of pre-treatment and extraction conditions on the polyphenolic profile and antioxidant activity of Belgium apple wood

This study describes the possibilities of valorising a waste stream that originates from apple wood by mapping the reducing capacity and phenolic profile from extracts derived from apple tree (Malus domestica). This study evaluated the efficiency of warm solvent extraction (WSE) and ultrasound-assisted extraction (UAE) techniques for extracting antioxidant phenolic compounds from the bark and core wood of an apple tree cultivated in the north-eastern part of Belgium. Furthermore, the influence of the pre-treatment technique, namely, fresh, oven-dried, and freeze-dried samples, respectively, on the yield of polyphenols was studied. Fresh bark extract obtained by UAE—the most efficient extraction technique—employing acetone 60% v/v contains the highest levels of phenolic compounds as well as the highest antioxidant activity. High-performance liquid chromatographic analysis shows that phloridzin is the major compound of the identified polyphenol markers present in bark and core wood extracts. Based on the obtained results, it may be possible to produce a polyphenolic extract from apple wood at an industrial scale without extensive costs or altering the antioxidant properties. This study reveals the potential of apple tree wood residues valorisation through the recovery of phenolic compounds for food, pharmaceutical, and cosmetic applications.status: Published onlin