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Chemical Characterization and In Vitro Bioactivity of Apple Bark Extracts Obtained by Subcritical Water

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Abstract

Recently, the value of wood residues has received increasing attention due to the presence of pharmacologically active compounds. In the present study, apple bark was treated with subcritical water (SWE) with the aim of bioactivity determination and chemical analysis by GC–MS applying two different sample preparation protocols and by HPLC. Extracts were screened for their total antioxidant capacity by means of total phenolic (TPC) and flavonoid contents (TFC), ferric reducing antioxidant power (FRAP) and DPPH-radical scavenging activity (DPPH-RSA). Anti-microbial and anti-proliferative activities of the apple bark subcritical water extracts were also examined. Different lignin and cellulose degradation products were identified by GCMS, as well as naturally present compounds. Identified compounds encompassed organic and fatty acids, alcohols, sugars, phenol, benzaldehyde, cinnamic acid, cinnamaldehyde and azulene derivatives, as well as other organic compounds. Phenolic profiles of apple bark extracts defined by HPLC–PDA analysis revealed that the main contributors were gallic acid (9.4 ± 0.5 mg/g DW) and catechin (8.3 ± 0.4 mg/g DW). The diversity of the extracts composition supports the fact that this medium is able to extract compounds of different polarities, simultaneously acting as catalyst and reactant. The characterized apple bark extracts demonstrated good antioxidant (TPC = 31.47 ± 1.86 mg GAE/g; TFC = 17.40 ± 1.89 mg EE/g; FRAP = 22.45 ± 2.22 mg AAE/g; DPPH-RSA = 22.57 ± 2.24 mg Trolox E/g DW), antimicrobial (MIC = 19.53156.25 μg/mL) and anti-proliferative activity (IC50 = 19.88–47.44 μg/mL). The findings of this study showed that SWE can be used as an environmentally friendly and safe technique for the valorization of apple tree wood residues, applicable in food and pharmaceutical industries.

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Acknowledgements

The authors are grateful to the Serbian Ministry of Education, Science and Technological Development (451-03-68/2020-14/200134), Provincial Secretariat for High Education and Scientific Research AP Vojvodina, Serbia (Project No. 142-451-3240/2020-03), Provincial Secretariat for Science and Technological Development and Portuguese Ministry of Science (FCT/Servia 2015/2016 proc. 441.00 SERVIA). Financial support from the Ministerio de Economía y Competitividad (Spanish Government) through the Grant CTQ2016-77155-R is also gratefully acknowledged. R. Suárez thanks to the Conselleria d’Educació, Cultura i Universitats from the Government of the Balearic Islands for a PhD stipend co-financed by Fondo Social Europeo (FPI/1444/2012). S. Clavijo acknowledges to Torres Quevedo Program of the Ministerio de Economía y Competitividad (MINECO) co-financed by European Funds, for the financial support through the PTQ 15-08038. This work was also supported by UIDB/50006/2020 and UIDP/50006/2020 by the Fundação para a Ciência e a Tecnologia (FCT)/Ministério da Ciência, Tecnologia e Ensino Superior (MCTES) through national funds. Manuela M. Moreira (project CEECIND/02702/2017) is grateful for the financial support financed by national funds through FCT and to REQUIMTE/LAQV. Manuela M. Moreira (SFRH/BPD/97049/2013) and M. F. Barroso (SFRH/BPD/78845/2011) are grateful for the postdoctoral fellowships financed by POPH-QREN—Tipologia 4.1—Formação Avançada, subsidized by Fundo Social Europeu and Ministério da Ciência, Tecnologia e Ensino Superior. The financial support from Fundação para a Ciência e Tecnologia/ Ministério da Ciência, Tecnologia e Ensino Superior (FCT/MEC) through national funds and co-financed by European Regional Development Fund (FEDER), under the Partnership Agreement PT2020 through the project UID/ QUI/50006/2013—POCI/01/0145/FERDER/007265 is also acknowledged. Annick Boeykens wishes to acknowledge Odisee for funding by means of a PWO grant (Flemish Government; Belgium).

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Švarc-Gajić, J., Cerdà, V., Delerue-Matos, C. et al. Chemical Characterization and In Vitro Bioactivity of Apple Bark Extracts Obtained by Subcritical Water. Waste Biomass Valor 12, 6781–6794 (2021). https://doi.org/10.1007/s12649-021-01477-z

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