Effect of water extraction on sugars recovery from steam exploded olive tree pruning

Design and Optimization of Sulfuric Acid Pretreatment of Extracted Olive Tree Biomass Using Response Surface Methodology

“…Xylose was the main hemicellulosic sugar, accounting for 63% of the sugar content in the hemicellulose fraction. Before the acid pretreatment, raw OTB was subjected to an aqueous extraction in order to remove soluble components like extractives, avoiding the formation of complex lignin-carbohydrates (Ballesteros et al 2011). Li et al (2016) also tested the effect of removing water extractives from corn stover, and determined a significant increase in the enzymatic digestibility after liquid hot water pretreatment.…”

“…Because extractives were mostly solubilized in the previous aqueous extraction, the biomass solubilized by acid pretreatment corresponded mainly to the hemicellulose fraction and some part of the glucan fraction, depending on pretreatment conditions. Even though most of the glucans could be considered cellulose, approximately 20% of OTB glucan is starch, which is not solubilized in the water extraction step (Ballesteros et al 2011). This starch fraction should be solubilized during the acid pretreatment.…”

Combination of water extraction with dilute-sulphuric acid pretreatment for enhancing the enzymatic hydrolysis of Jatropha curcas shells

“…Condensation reactions between extractives and lignin could occur during pretreatment hindering the enzymatic hydrolysis of the pretreated material (Ballesteros et al, 2011). Also, the sugars contained in the water-soluble fraction can undergo degradation under the acid pretreatment conditions leading to formation of by-products that could be inhibitory to yeast and enzymes.…”

“…In addition to that, some of the water-soluble extractives, mainly phenolics, from lignocellulosic biomass are known to inhibit enzyme and microbial activity (Griffiths and Jones, 1977;Femi-Ola and Aderibigbe, 2008;Jönsson et al, 2013). These concerns, together with the report by Ballesteros et al (2011) about improving the enzymatic hydrolysis of olive tree pruning by removal of water-soluble extractives prior to steam pretreatment, motivated us to investigate how water extraction could affect the acid pretreatment of J. curcas shells.…”

Processing, Valorization and Application of Bio-Waste Derived Compounds from Potato, Tomato, Olive and Cereals: A Review

“…The residues mainly consist of thin branches, leaves and wood, comprising cellulose, hemicellulose, lignin, minerals and extractives. Valuable compounds of that can be extracted from these residues include glucose, phenolics and other antioxidants [360,[362][363][364]. Steam explosion is also considered as an effective pretreatment for obtaining valuable compounds from olive residues, including pomace and leaves [365,366].…”