Comparison of industrially viable pretreatments to enhance soybean straw biodegradability

Cabrera, Emir; Muñoz, Marı́a; Martín, Ricardo Isaac Pérez; Caro, Ildefonso; Curbelo, Caridad; Díaz, Ana Belén

doi:10.1016/j.biortech.2015.06.090

Cited by 33 publications

(25 citation statements)

References 33 publications

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“…The straw is usually disposed as waste through landfilling, incineration, or dumping. The average composition of soybean straw is 35% cellulose, 21% insoluble lignin, 17% hemicelluloses, 11% ash, and 1% acid soluble lignin; the remaining constituents are protein, pectin, and glucuronic acid substitutes [2,3]. Stems and pods have slightly different lignocellulosic composition: the holocellulose content is 69.2% and 53.8%, respectively, and the lignin content is 21.6% and 17.2%, respectively [4].…”

Section: Introductionmentioning

confidence: 99%

Using Commercial Enzymes to Produce Cellulose Nanofibers from Soybean Straw

Martelli‐Tosi¹,

Torricillas²,

Martins

et al. 2016

Journal of Nanomaterials

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This study used commercial enzymes to isolate cellulose nanofibrils (CN) and produce sugars from chemically pretreated soybean straw (SS) (stem, leaves, and pods) by alkali (NaOH 5 or 17.5% v/v at 90°C for 1 h or at 30°C for 15 h) and bleaching (NaClO23.3% or H2O24%) pretreatments. Depending on the pretreatment applied to the soybean straw, the yield of CN varied from 6.3 to 7.5 g of CN/100 g of SS regardless of the concentration of the alkaline solution (5 or 17.5%). The CN had diameter of 15 nm, measured over 300 nm in length, and had high electrical stability (zeta potentials ranged from −20.8 to −24.5). Given the XRD patterns, the crystallinity index (CrI) of CN ranged from 45 to 68%, depending on the chemical pretreatment the starting material was submitted to. CN obtained from SS treated with NaOH 17.5% and H2O2(CrI = 45%) displayed better thermal stability probably because a lignin-cellulose complex emerged. The soluble fraction obtained in the first step of CN production contained a large amount of reducing sugars (11.2 to 30.4 g/100 g of SS). SS seems to be a new promising industrial source to produce CN via enzymatic-mechanical treatment, leading to large amounts of reducing sugars for use in bioenergy production.

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Section: Introductionmentioning

confidence: 99%

Using Commercial Enzymes to Produce Cellulose Nanofibers from Soybean Straw

Martelli‐Tosi¹,

Torricillas²,

Martins

et al. 2016

Journal of Nanomaterials

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“…For this reason each lignocellulose residue, depending on its particle size, shows an optimum value for both LSR and ESR. In previous papers, we established the optimal conditions for the hydrolysis of several types of residues with different particle sizes . In each experiment, the evolution of the total monosaccharide concentration in the bulk of the liquid over time was registered.…”

Section: Resultsmentioning

confidence: 99%

A kinetic model considering the heterogeneous nature of the enzyme hydrolysis of lignocellulosic materials

Caro

Blandino

Díaz

et al. 2019

Biofuels Bioprod Bioref

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In this work, a mathematical model is proposed to predict the kinetic behaviour of the enzymatic conversion of various types of lignocellulosic biomass into fermentable sugars. Digestion of the cellulosic polymers is carried out using enzymatic hydrolysis under different conditions. Unlike other kinetic models, published previously for this process, this one considers the heterogeneous nature of the process by which a solid, in the form of small particles, is decomposed to monosaccharides by the action of a diverse set of enzymes in solution. The effect of the particle size on the hydrolysis rate has also been taken into consideration. To assess the model's goodness of fit to any general situation, the experimental data obtained in the hydrolysis of three different lignocellulosic residues have been analysed. Thus, the hydrolysis data of wheat straw, rice husks and exhausted sugar beet pellets have been compared with the theoretical values calculated by the model. The results obtained show that this model predicts the enzyme's hydrolysis of lignocellulosic substrates under different conditions very accurately and it could therefore be used efficiently in the optimization of the hydrolysis processes implemented in the bio-refinery industry. is a lecturer in the Department of Chemical Engineering and Food Technology at the University of Cádiz, with a background in chemistry and a PhD in chemical engineering from the same university. Her research focuses on the use and valorization of agrofood residues and byproducts using solid-state fermentation and submerged culture, the production of hydrolytic enzymes with industrial applications and the production of value-added bioproducts. Cristina MarzoCristina Marzo is a PhD student chemical engineering at the University of Cádiz. She graduated and obtained a master's degree in chemical engineering from the same university. Her research focuses on the valorization of agroindustrial wastes and byproducts with the main objective of obtaining value-added products. The techniques used for this are mainly biological processes, such as enzyme hydrolysis, submerged fermentation and solid-state fermentation.

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“…However, other crops are also prominent, such as wheat, cassava, rice, banana, and oil palm. Processing these crops generates large amounts of solid residues, including in‐field or agricultural residues (straw, leaves, and foliage) and agro‐industrial processing residues (bagasse, bunches, and shells) with diverse composition and volume (Table ) …”

Section: The Agro‐industrial Residues In South Americamentioning

confidence: 99%

Lignocellulosic biomass from agro‐industrial residues in South America: current developments and perspectives

Magalhães

Carvalho

Pereira

et al. 2019

Biofuels Bioprod Bioref

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South America is a pivotal supplier of agricultural commodities for a growing world population. This large-scale production generates a substantial amount of lignocellulosic residue. Inadequate disposal of this material can lead to putrefaction and leaching, and can attract insects and rodents. Solid residues can be treated by incineration or composting -both causing greenhouse gas emissions. Biotransformation of lignocellulosic residues into valuable products has been proposed as a more sophisticated alternative to burning. However, pretreatment steps are necessary to obtain fermentable sugars for biological or thermochemical transformation into value-added products. In this review, we noted trends in lignocellulosic biomass generation and potential uses, with special attention to the procedures necessary for the generation of fermented products and bio-oil. This survey pointed out that sugarcane bagasse, cereal straws, bananas, and oil-palm biomass can generate about 900 million tonnes of biomass by 2025. Based on production data from several researchers it was estimated that these raw materials have the potential for annual production of more than 550 million tonnes of fermentable sugars (i.e., glucose and xylose), 670 million tonnes of bio-oil, or 4000 TWh of thermal energy. We describe procedures and strategies for the conversion of these residues to produce higher value-added biomolecules and to promote more sustainable application of lignocellulosic biomass

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Comparison of industrially viable pretreatments to enhance soybean straw biodegradability

Cited by 33 publications

References 33 publications

Using Commercial Enzymes to Produce Cellulose Nanofibers from Soybean Straw

Using Commercial Enzymes to Produce Cellulose Nanofibers from Soybean Straw

A kinetic model considering the heterogeneous nature of the enzyme hydrolysis of lignocellulosic materials

Lignocellulosic biomass from agro‐industrial residues in South America: current developments and perspectives

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