Thanks are due to the University of Aveiro and FCT/MCT for the financial support for the QOPNA research Unit (FCT UID/QUI/00062/2019) and to CITAB research Unit (FCT UID/AGR/04033/2019) through national funds and, where applicable, co-financed by the FEDER, within the PT2020 Partnership Agreement, and to the Portuguese NMR Network. Pedro A. R. Fernandes (SFRH/BD/107731/2015) and Elisabete Coelho (SFRH/BPD/70589/2010) were supported by FCT/MEC grants. Claudia Passos acknowledges FCT (CEECIND/01873/2017) contract. Susana M. Cardoso thanks the research contract under the project AgroForWealth: Biorefining of agricultural and forest by-products and wastes: integrated strategic for valorisation of resources towards society wealth and sustainability (CENTRO-01-0145-FEDER-000001), funded by Centro2020, through FEDER and PT2020. Thanks are due to Indumape for providing the apple pomace and to project Profitapple 3862.