scholarly journals Evaluating Lignin-Rich Residues from Biochemical Ethanol Production of Wheat Straw and Olive Tree Pruning by FTIR and 2D-NMR

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
José I. Santos ◽  
Raquel Martín-Sampedro ◽  
Úrsula Fillat ◽  
José M. Oliva ◽  
María J. Negro ◽  
...  
Keyword(s):  
Ethanol Production ◽  
Wheat Straw ◽  
Internal Energy ◽  
Energy Use ◽  
Value Added ◽  
Olive Tree ◽  
2D Nmr ◽  
Cellulosic Biomass ◽  
G Ratio ◽  
Tree Pruning

Lignin-rich residues from the cellulose-based industry are traditionally incinerated for internal energy use. The future biorefineries that convert cellulosic biomass into biofuels will generate more lignin than necessary for internal energy use, and therefore value-added products from lignin could be produced. In this context, a good understanding of lignin is necessary prior to its valorization. The present study focused on the characterization of lignin-rich residues from biochemical ethanol production, including steam explosion, saccharification, and fermentation, of wheat straw and olive tree pruning. In addition to the composition and purity, the lignin structures (S/G ratio, interunit linkages) were investigated by spectroscopy techniques such as FTIR and 2D-NMR. Together with the high lignin content, both residues contained significant amounts of carbohydrates, mainly glucose and protein. Wheat straw lignin showed a very low S/G ratio associated withp-hydroxycinnamates (p-coumarate and ferulate), whereas a strong predominance of S over G units was observed for olive tree pruning lignin. The main interunit linkages present in both lignins wereβ-O-4′ethers followed by resinols and phenylcoumarans. These structural characteristics determine the use of these lignins in respect to their valorization.

Product contamination and harvesting losses from mechanized recovery of olive tree pruning residues for energy use

2013 ◽  
Vol 53 ◽  
pp. 350-353 ◽  
Author(s):  
Andrea Acampora ◽  
Sara Croce ◽  
Alberto Assirelli ◽  
Angelo Del Giudice ◽  
Raffaele Spinelli ◽  
...  
Keyword(s):  
Energy Use ◽  
Olive Tree ◽  
Pruning Residues ◽  
Tree Pruning

Structural characteristics of lignin in pruning residues of olive tree (Olea europaea L.)

Holzforschung ◽  
2018 ◽  
Vol 73 (1) ◽  
pp. 25-34 ◽  
Author(s):  
Jorge Rencoret ◽  
Ana Gutiérrez ◽  
Eulogio Castro ◽  
José C. del Río
Keyword(s):  
Fossil Fuels ◽  
Lignin Content ◽  
Structural Characteristics ◽  
Olive Tree ◽  
2D Nmr ◽  
Raw Material ◽  
Cell Wall Polysaccharides ◽  
Alkyl Aryl ◽  
Additional Information ◽  
G Ratio

AbstractOlive tree pruning (OTP) is an abundant and inexpensive agricultural lignocellulosic residue that is an interesting feedstock for producing bioethanol and other bio-products in the context of lignocellulosic biorefineries. However, the presence of lignin in OTP hinders the transformation processes as it limits the access to cell wall polysaccharides. On the other hand, the aromatic/phenolic structure of the lignin polymer makes it an interesting raw material for producing chemicals, fuels and other commodities that are nowadays produced from fossil fuels. Thus, the knowledge of the OTP lignin structure is crucial to develop tailor-made pretreatments for their removal as well as for additional valorization of the lignin polymer. In this work, the OTP lignin was isolated as milled wood lignin (MWL), a lignin preparation that is considered representative of the native lignin, and characterized by two-dimensional nuclear magnetic resonance (2D-NMR) and thioacidolysis. The results demonstrated that the lignin is mainly composed of guaiacyl (G) and syringyl (S) lignin units in similar abundances (S/G ratio of ~1), with minor amounts ofp-hydroxyphenyl (H) units. The most abundant lignin inter-unit linkages are β-O-4′ alkyl-aryl ethers (75% of all linkages), followed by the condensed phenylcoumarans (12%) and resinols (8%), and with lower amounts of dibenzodioxocins (2%) and spirodienones (3%). The analysis of the thioacidolysis dimers gave additional information regarding the distribution of the lignin units involved in condensed interunit linkages, including 5-5′, 4-O-5′, β-5′, β-1′ and β-β′. The high lignin content (25%), together with the relatively low S/G ratio and the abundance of condensed (carbon-carbon linked) structures, points to a low reactivity of OTP lignin during delignification pretreatments.

scholarly journals Ethanol Production from Wheat Straw Hydrolysate by Issatchenkia Orientalis Isolated from Waste Cooking Oil

2021 ◽  
Vol 7 (2) ◽  
pp. 121
Author(s):  
Alexander Zwirzitz ◽  
Lauren Alteio ◽  
Daniel Sulzenbacher ◽  
Michael Atanasoff ◽  
Manuel Selg
Keyword(s):  
Ethanol Production ◽  
Wheat Straw ◽  
Elevated Temperatures ◽  
Value Added ◽  
Waste Cooking Oil ◽  
Lignocellulosic Materials ◽  
Fermentation Inhibitors ◽  
Issatchenkia Orientalis ◽  
Cooking Oil ◽  
Wheat Straw Hydrolysate

The interest in using non-conventional yeasts to produce value-added compounds from low cost substrates, such as lignocellulosic materials, has increased in recent years. Setting out to discover novel microbial strains that can be used in biorefineries, an Issatchenkia orientalis strain was isolated from waste cooking oil (WCO) and its capability to produce ethanol from wheat straw hydrolysate (WSHL) was analyzed. As with previously isolated I. orientalis strains, WCO-isolated I. orientalis KJ27-7 is thermotolerant. It grows well at elevated temperatures up to 42 °C. Furthermore, spot drop tests showed that it is tolerant to various chemical fermentation inhibitors that are derived from the pre-treatment of lignocellulosic materials. I. orientalis KJ27-7 is particularly tolerant to acetic acid (up to 75 mM) and tolerates 10 mM formic acid, 5 mM furfural and 10 mM hydroxymethylfurfural. Important for biotechnological cellulosic ethanol production, I. orientalis KJ27-7 grows well on plates containing up to 10% ethanol and media containing up to 90% WSHL. As observed in shake flask fermentations, the specific ethanol productivity correlates with WSHL concentrations. In 90% WSHL media, I. orientalis KJ27-7 produced 10.3 g L−1 ethanol within 24 h. This corresponds to a product yield of 0.50 g g−1 glucose (97% of the theoretical maximum) and a volumetric productivity of 0.43 g L−1 h−1. Therefore, I. orientalis KJ27-7 is an efficient producer of lignocellulosic ethanol from WSHL.

scholarly journals Olive tree pruning as an agricultural residue for ethanol production. Fermentation of hydrolysates from dilute acid pretreatment

2012 ◽  
Vol 10 (3) ◽  
pp. 643 ◽  
Author(s):  
M. J. Díaz-Villanueva ◽  
C. Cara-Corpas ◽  
E. Ruiz-Ramos ◽  
I. Romero-Pulido ◽  
E. Castro-Galiano
Keyword(s):  
Ethanol Production ◽  
Olive Tree ◽  
Dilute Acid Pretreatment ◽  
Dilute Acid ◽  
Acid Pretreatment ◽  
Agricultural Residue ◽  
Tree Pruning

Ethanol production from glucose and xylose obtained from steam exploded water-extracted olive tree pruning using phosphoric acid as catalyst

2014 ◽  
Vol 153 ◽  
pp. 101-107 ◽  
Author(s):  
M.J. Negro ◽  
C. Alvarez ◽  
I. Ballesteros ◽  
I. Romero ◽  
M. Ballesteros ◽  
...  
Keyword(s):  
Phosphoric Acid ◽  
Ethanol Production ◽  
Olive Tree ◽  
Tree Pruning

scholarly journals Biorefining strategy for maximal monosaccharide recovery from three different feedstocks: Eucalyptus residues, wheat straw and olive tree pruning

2015 ◽  
Vol 183 ◽  
pp. 203-212 ◽  
Author(s):  
Talita Silva-Fernandes ◽  
Luís Chorão Duarte ◽  
Florbela Carvalheiro ◽  
Susana Marques ◽  
Maria Conceição Loureiro-Dias ◽  
...  
Keyword(s):  
Wheat Straw ◽  
Olive Tree ◽  
Tree Pruning

Bioconversion in batch bioreactor of olive-tree pruning biomass optimizing treatments for ethanol production

2020 ◽  
Vol 164 ◽  
pp. 107793
Author(s):  
Bruno Guedes Fonseca ◽  
Soledad Mateo ◽  
Inês Conceição Roberto ◽  
Sebastián Sánchez ◽  
Alberto J. Moya
Keyword(s):  
Ethanol Production ◽  
Olive Tree ◽  
Batch Bioreactor ◽  
Tree Pruning

An Olive Tree Pruning Biorefinery for Co-Producing High Value-Added Bioproducts and Biofuels: Economic and Energy Efficiency Analysis

2016 ◽  
Vol 9 (4) ◽  
pp. 1070-1086 ◽  
Author(s):  
J. M. Romero-García ◽  
A. Sanchez ◽  
G. Rendón-Acosta ◽  
J. C. Martínez-Patiño ◽  
E. Ruiz ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Value Added ◽  
Olive Tree ◽  
Efficiency Analysis ◽  
Tree Pruning ◽  
Energy Efficiency Analysis

Enzymatic hydrolyses of pretreated eucalyptus residues, wheat straw or olive tree pruning, and their mixtures towards flexible sugar-based biorefineries

2016 ◽  
Vol 6 (4) ◽  
pp. 385-396 ◽  
Author(s):  
T. Silva-Fernandes ◽  
S. Marques ◽  
R. C. L. B. Rodrigues ◽  
M. C. Loureiro-Dias ◽  
C. Fonseca ◽  
...  
Keyword(s):  
Wheat Straw ◽  
Olive Tree ◽  
Tree Pruning
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