期刊
ADVANCED SUSTAINABLE SYSTEMS
卷 6, 期 4, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsu.202100361
关键词
capillary zone electrophoresis; exhausted olive pomace; lignin; organosolv pretreatment; phenolic compounds
资金
- Agencia Estatal de Investigacion (MICINN, Spain)
- European Regional Development Fund [ENE2017-85819-C2-1-R, RED2018-102623-T]
- FEDER UJA project - Programa Operativo FEDER 2014-2020 [1260905]
- Consejeria de Economia y Conocimiento de la Junta de Andalucia, the Ministry of Science and Innovation of Spain [RYC2018-026177-I/AEI/10.13039/501100011033]
- UJA [R5/04/2017]
- Operational Programme for Competitive-ness and Internationalization (PORTUGAL2020) [LISBOA-01-0145-FEDER-022059]
- Lisbon Portugal Regional Operational Programme (Lisboa 2020)
- North Portugal Regional Operational Programme (Norte 2020) under the Portugal 2020 Partnership Agreement, through the European Regional Development Fund (ERDF)
The study aims to devise an integrated strategy for the valorization of exhausted olive pomace (EOP) by two-step extraction and evaluate the impact of ethanol organosolv pretreatment on delignification and enzymatic hydrolysis. The results show that the selected aqueous extraction process effectively removes extractives from EOP and fully recovers specific components, while the ethanol organosolv pretreatment significantly enhances the enzymatic digestibility of lignin and yields high-purity organosolv lignin.
The olive pomace oil extracting industry generates large amounts of exhausted olive pomace (EOP), a lignocellulosic waste that needs to be managed according to sustainable criteria. The aim of this work is to devise an integrated strategy to valorize EOP by applying two-step extraction, and to evaluate the effect of an ethanol organosolv pretreatment on the delignification and enzymatic hydrolysis of the extracted EOP. Once the extraction and organosolv pretreatment conditions are selected, solubilized lignin is recovered from the pretreatment liquor using different methods. In addition to those organosolv lignin samples, a lignin-rich solid is obtained after enzymatic saccharification of the pretreated solid. All the lignin samples are fully characterized aiming at further valorization. The selected two-step aqueous extraction (85 degrees C, 90 min, 10% biomass) removes 89% of the extractives content in raw EOP and achieves the full recovery of phenols and mannitol content in that fraction, 4.7 mg gallic acid equivalents per g EOP and 4.5 mg g(-1) EOP, respectively. The organosolv pretreatment (50% ethanol catalyzed with 1% H2SO4, 140 degrees C, 60 min, 15% biomass) results in a delignified solid with 81% of enzymatic digestibility and a high purity organosolv lignin (>71%), rich in guaiacyl units.
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