RT info:eu-repo/semantics/article
T1 Pressurized liquid extraction optimization from supercritical defatted olive pomace: a green and selective phenolic extraction process
A1 Katsinas, Nicolaos
A1 Bento da Silva, Andreia
A1 Enriquez De Salamanca Aladro, Amalia
A1 Fernández, Naiara
A1 Bronze, Maria Rosario
A1 Rodríguez Rojo, Soraya
K1 Antioxidantes
K1 Compuestos aromáticos
K1 Extraction (Chemistry)
K1 Hydrocarbons
K1 Solvents
K1 Aceite de oliva
K1 Aceite de oliva -  Análisis
K1 Olive pomace
K1 Phenolic extracts
AB Olive pomace (OP) is the main by-product of the olive oil industry produced in large quantities. Its valorization as a source of phenolic bioactive compounds is paramount for the sustainable growth of related industries. This work proposes an intensified process to maximize the recovery of phenolic compounds in dry extracts using hydroalcoholic mixtures. Supercritical carbon dioxide defatting pre-treatment was performed. Following this, pressurized liquid extraction was optimized through a circumscribed central composite design. The factors consisted of temperature (65.0–185.0 °C), ethanol percentage (8.0–92.0%), and solid/liquid ratio (0.2–0.8 gOP/mLSOLVENT). Besides the total phenolic content (TPC) and the total flavonoid content (TFC), the major phenolic compounds of OP [hydroxytyrosol (HT), tyrosol (TY), and oleuropein (OL)] were evaluated. Further, decarboxymethyl OL aglycone dialdehyde (3,4-DHPEA-DEDA) was identified by HPLC-DAD-MS/MS as the most abundant polyphenol and was studied for the first time for OP. Different conditions were found to optimize each key compound. In 67% shorter extraction time and 38% less solvent consumption compared to conventional extraction, an increase of 475% for OL, 428% for HT, 194% for TY, 373% for 3,4-DHPEA-DEDA, 89% for TPC, and 158% for TFC was observed. The antioxidant activity by oxygen radical absorbance capacity (ORAC) assay increased 89% (optimal conditions) and correlated with TPC, 3,4-DHPEA-DEDA, and TFC. Thus, an efficient, selective, scalable, and green extraction process was established.
PB American Chemical Society
SN 2168-0485
YR 2021
FD 2021
LK https://uvadoc.uva.es/handle/10324/55629
UL https://uvadoc.uva.es/handle/10324/55629
LA eng
NO ACS Sustainable Chemistry and Engineering, 2021, Vol. 9, Nº. 16, págs. 5590–5602
NO Producción Científica
DS UVaDOC
RD 05-ene-2025