abstract
The extraction of proanthocyanidins (PACs), despite being an important and limiting aspect of their industrial application, is still largely unexplored. Herein, the possibility of combining eutectic solvents (ESs) with microwave assisted extraction (MAE) in the extraction of PACs from grape pomace (GP) is explored, aiming to improve not only the extraction yield but also the mean degree of polymerization (mDP). The combination of choline chloride with lactic acid was shown to be the most effective combination for PACs extraction yield (135 mg(PAC)/g(GP)) and, despite the occurrence of some depolymerization, also enabled us to achieve the highest mDP (7.13). Additionally, the combination with MAE enabled the process to be completed in 3.56 min, resulting in a considerably reduced extraction time.
keywords
PLANT-EXTRACTS; TANNINS; PROCYANIDINS; POLYPHENOLS; CLEAVAGE; LEAVES
subject category
Biochemistry & Molecular Biology; Chemistry
authors
Neto, RT; Santos, SAO; Oliveira, J; Silvestre, AJD
our authors
Armando Jorge Domingues Silvestre
Full professor
Rodrigo de Sousa Trêpa Alves Neto
PhD Student
Sónia Andreia Oliveira Santos
Assistant ResearcherProjects
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
acknowledgements
This research was funded by FCT/MCTES with the financial support to CICECO (UIDB/50011/2020 & UIDP/50011/2020) and REQUIMTE (UIDB/50006/2020 & UIDP/50006/2020), R. T. Neto PhD grant (SFRH/BD/129174/2017) and S. A. O. Santos's researcher contract were included in the AgroForWealth project (CENTRO-01-0145-FEDER-000001).