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A biorefinery approach to obtain antioxidants, lignin and sugars from exhausted olive pomace
Irene Gómez-Cruz,María del Mar Contreras,Inmaculada Romero,Eulogio Castro 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.96 No.-
Exhausted olive pomace (EOP) is the main residue of the pomace olive oil extracting industry. In thiswork, EOP was fractionated into valuable components for valorisation: an aqueous extract rich inhydroxytyrosol and mannitol, lignins with antioxidant properties and fermentable sugars. EOP wasfirstsubjected to water extraction at 85 C for 90 min. Several pretreatments based on liquid hot water andorganosolv with 50% or 60% ethanol (catalysed and uncatalysed with 1% sulfuric acid) were thenevaluated in terms of delignification ability and efficiency for enzymatic hydrolysis of the pretreatedsolids. Once the best conditions had been selected (50 % ethanol-1% sulfuric acid at 130 C for 60 min), anorganosolv lignin (OL) with antioxidant properties was obtained through acid precipitation of thepretreatment liquor. This was compared to the enzymatic hydrolysis lignin obtained in the subsequentstep and to the lignins purified by acid hydrolysis. OL showed a higher total phenolic content andantioxidant activity than the rest of the lignin samples. Chemical differences were also observed thatcould explain the results.
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