TY - JOUR
T1 - Recovery of lignins with antioxidant activity from Brewer’s spent grain and olive tree pruning using deep eutectic solvents
AU - Cassoni, Ana C.
AU - Costa, Patrícia
AU - Mota, Inês
AU - Vasconcelos, Marta W.
AU - Pintado, Manuela
N1 - Funding Information:
The authors would like to thank the support of National Funds from FCT - Fundação para a Ciência e Tecnologia through project UIDB/50016/2020 . Funding for author Ana C. Cassoni was, provided by Fundação para a Ciência e a Tecnologia – Portugal (via the PhD fellowship ref. SFRH/BD/143198/2019 ).
Publisher Copyright:
© 2023
PY - 2023/4
Y1 - 2023/4
N2 - Agro-food industry generates lignocellulosic residues that can be highly valuable. Nonetheless, lignin is still an underrated biopolymer although it has several potential applications. Lignin can be extracted from biomasses using several pretreatments, being Deep Eutectic Solvents (DES) an environmental-friendly method. Thus, this work proposes to recover lignin from two different agro-food residues – Brewer’s spent grain (BSG) and Olive tree pruning (OTP) – using DES. Experimental designs were carried out for each residue to determine the best lignin extraction conditions based on yield and antioxidant activity. The optimum conditions (120 °C and 5 h) allowed lignin yields of 54.4% and 37.8% for BSG and OTP, respectively, with relatively high purities (>75%). Structurally, both OTP and BSG lignins have similar molecular weights, and FTIR analysis showed that OTP has more aromatic related bands. The OTP lignin showed higher antioxidant activity than BSG. This study demonstrates, for the first time, that DES is a promising solvent for successfully extracting lignins from OTP and BSG biomasses with high purities and valuable properties.
AB - Agro-food industry generates lignocellulosic residues that can be highly valuable. Nonetheless, lignin is still an underrated biopolymer although it has several potential applications. Lignin can be extracted from biomasses using several pretreatments, being Deep Eutectic Solvents (DES) an environmental-friendly method. Thus, this work proposes to recover lignin from two different agro-food residues – Brewer’s spent grain (BSG) and Olive tree pruning (OTP) – using DES. Experimental designs were carried out for each residue to determine the best lignin extraction conditions based on yield and antioxidant activity. The optimum conditions (120 °C and 5 h) allowed lignin yields of 54.4% and 37.8% for BSG and OTP, respectively, with relatively high purities (>75%). Structurally, both OTP and BSG lignins have similar molecular weights, and FTIR analysis showed that OTP has more aromatic related bands. The OTP lignin showed higher antioxidant activity than BSG. This study demonstrates, for the first time, that DES is a promising solvent for successfully extracting lignins from OTP and BSG biomasses with high purities and valuable properties.
KW - Lignin
KW - Deep eutectic solvents
KW - Brewer’s spent grain
KW - Olive tree pruning
KW - Antioxidant activity
UR - http://www.scopus.com/inward/record.url?scp=85149072405&partnerID=8YFLogxK
U2 - 10.1016/j.cherd.2023.01.053
DO - 10.1016/j.cherd.2023.01.053
M3 - Article
SN - 0263-8762
VL - 192
SP - 34
EP - 43
JO - Chemical Engineering Research and Design
JF - Chemical Engineering Research and Design
ER -